{"id":2820,"date":"2026-06-12T11:13:02","date_gmt":"2026-06-12T03:13:02","guid":{"rendered":"https:\/\/jkrglo.com\/?p=2820"},"modified":"2026-10-27T17:07:12","modified_gmt":"2026-10-27T09:07:12","slug":"what-is-pcba-test","status":"publish","type":"post","link":"https:\/\/jkrglo.com\/ko\/what-is-pcba-test\/","title":{"rendered":"PCBA \ud14c\uc2a4\ud2b8\ub780 \ubb34\uc5c7\uc778\uac00\uc694?"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"2820\" class=\"elementor elementor-2820\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2197b92e e-flex e-con-boxed e-con e-parent\" data-id=\"2197b92e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-63d9be44 e-con-full e-flex e-con e-child\" data-id=\"63d9be44\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-23e7bd4e elementor-widget elementor-widget-breadcrumbs\" data-id=\"23e7bd4e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"breadcrumbs.default\">\n\t\t\t\t\t<p id=\"breadcrumbs\"><span><span><a href=\"https:\/\/jkrglo.com\/\">HOME<\/a><\/span><\/span><\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-24a9843c e-flex e-con-boxed e-con e-parent\" data-id=\"24a9843c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-3d8692ff e-con-full e-flex e-con e-child\" data-id=\"3d8692ff\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-1558e31d e-con-full e-flex e-con e-child\" data-id=\"1558e31d\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-750f0992 elementor-widget elementor-widget-heading\" data-id=\"750f0992\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">PCBA Testing: What Each Method Catches, What It Misses, and How to Choose<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-2f148d1d e-con-full e-flex e-con e-child\" data-id=\"2f148d1d\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-1572d357 e-con-full e-flex e-con e-child\" data-id=\"1572d357\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-573558fb elementor-widget elementor-widget-post-info\" data-id=\"573558fb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"post-info.default\">\n\t\t\t\t\t\t\t<ul class=\"elementor-inline-items elementor-icon-list-items elementor-post-info\">\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item elementor-repeater-item-c9d822a elementor-inline-item\" itemprop=\"author\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text elementor-post-info__item elementor-post-info__item--type-author\">\n\t\t\t\t\t\t\t\t\t\tJKRGLO R&amp;D Engineer\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t<li class=\"elementor-icon-list-item elementor-repeater-item-2bae3db elementor-inline-item\" itemprop=\"datePublished\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text elementor-post-info__item elementor-post-info__item--type-date\">\n\t\t\t\t\t\t\t\t\t\t<time>06\/12\/2026<\/time>\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t<li class=\"elementor-icon-list-item elementor-repeater-item-5a82ee1 elementor-inline-item\">\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-far-clock\" 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256z\"><\/path><\/svg>\t\t\t\t\t<\/a>\n\t\t\t\t<\/span>\n\t\t\t\t\t\t\t<span class=\"elementor-grid-item\" role=\"listitem\">\n\t\t\t\t\t<a class=\"elementor-icon elementor-social-icon elementor-social-icon-x-twitter elementor-repeater-item-5ed3d93\" target=\"_blank\">\n\t\t\t\t\t\t<span class=\"elementor-screen-only\">X-twitter<\/span>\n\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fab-x-twitter\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M389.2 48h70.6L305.6 224.2 487 464H345L233.7 318.6 106.5 464H35.8L200.7 275.5 26.8 48H172.4L272.9 180.9 389.2 48zM364.4 421.8h39.1L151.1 88h-42L364.4 421.8z\"><\/path><\/svg>\t\t\t\t\t<\/a>\n\t\t\t\t<\/span>\n\t\t\t\t\t\t\t<span class=\"elementor-grid-item\" role=\"listitem\">\n\t\t\t\t\t<a class=\"elementor-icon elementor-social-icon elementor-social-icon-youtube elementor-repeater-item-02bc2ba\" target=\"_blank\">\n\t\t\t\t\t\t<span class=\"elementor-screen-only\">Youtube<\/span>\n\t\t\t\t\t\t<svg 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data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-5f95b952 e-con-full e-flex e-con e-child\" data-id=\"5f95b952\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t<div class=\"elementor-element elementor-element-16bb70ed e-con-full e-flex e-con e-child\" data-id=\"16bb70ed\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-63347ff4 elementor-widget elementor-widget-text-editor\" data-id=\"63347ff4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<div style=\"font-size:14px;line-height:1.78;color:#374151;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;\"><div style=\"background: #ecfdf5; border-left: 4px solid #10b981; padding: 18px 20px; margin: 0 0 24px; border-radius: 0 8px 8px 0;\">\n<p style=\"font-size: 14px; line-height: 1.78; margin: 0 0 16px;\"><strong>Quick answer<\/strong><\/p>\n<p style=\"font-size: 14px; line-height: 1.78; margin: 0 0 16px;\"><strong>PCBA testing<\/strong> checks a populated circuit board against defined electrical and functional requirements. A practical production plan combines inspection of the assembly with electrical checks and powered <strong>functional testing<\/strong> where required. Choose the methods from the defects and behaviors that must be detected, then confirm access, limits, records and failure handling before the build.<\/p>\n<p style=\"font-size: 14px; line-height: 1.78; margin: 0 0 16px;\"><strong>Test coverage<\/strong> is the set of faults, connections or functions a stated inspection or test program can evaluate under defined conditions. A list of installed machines is not a coverage statement.<\/p>\n<p style=\"font-size: 14px; line-height: 1.78; margin: 0 0 16px;\"><strong>A passing PCBA test result<\/strong> means the unit met the recorded checks and limits at that time. It does not prove every operating condition, every hidden joint or the product&#8217;s entire service life.<\/p>\n\n<\/div>\n<p style=\"font-size: 14px; line-height: 1.78; margin: 0 0 16px;\">Two suppliers can both quote a tested assembly and mean different things. One may check appearance and shorts. Another may load firmware, exercise interfaces and record measurements by serial number. Comparing those offers as if the test scope were identical is an avoidable sourcing error.<\/p>\n<p style=\"font-size: 14px; line-height: 1.78; margin: 0 0 16px;\">The same ambiguity causes trouble on the line. A board that passes optical inspection can still carry the wrong resistor value. A board that boots can still have an untested input, an intermittent connection or a configuration problem. The answer is not to buy every available test. It is to decide what evidence each stage must provide.<\/p>\n<p style=\"font-size: 14px; line-height: 1.78; margin: 0 0 16px;\">This guide joins the method-selection question with the common-defect question: which fault are you looking for, how can the chosen method detect it, and what happens if it fails? For the wider build sequence, see <a style=\"color: #2563eb; text-decoration: underline;\" href=\"https:\/\/jkrglo.com\/what-is-pcb-assembly\/\">the PCB assembly process<\/a>.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-df58492 e-con-full e-flex e-con e-child\" data-id=\"df58492\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t<div class=\"elementor-element elementor-element-17cb20f e-con-full e-flex e-con e-child\" data-id=\"17cb20f\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1fc20bd elementor-widget elementor-widget-text-editor\" data-id=\"1fc20bd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<div style=\"font-size:14px;line-height:1.78;color:#374151;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;\"><h2 style=\"font-size:22px;line-height:1.4;font-weight:700;color:#23282d;background:#dff5ff;border-left:4px solid #12b5ed;padding:10px 18px;margin:38px 0 16px;\">What Is PCBA Testing, and How Is It Different From Inspection?<\/h2><div style=\"background:#eff6ff;border-left:4px solid #3b82f6;padding:18px 20px;margin:0 0 20px;border-radius:0 8px 8px 0;\"><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\"><strong>PCBA testing<\/strong> is the application of defined electrical or functional checks to an assembled printed circuit board to evaluate specified manufacturing faults or product behavior.<\/p><\/div><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">People often use testing as an umbrella term for every quality checkpoint. That is workable in a conversation, but the production plan needs more precision. Inspection observes a feature, image or measured structure. Electrical testing measures circuit responses or connectivity. <strong>Functional testing<\/strong> exercises powered behavior. The categories overlap in equipment, but the evidence is not interchangeable.<\/p><div style=\"overflow-x:auto;margin:0 0 24px;\"><table style=\"font-size:14px;width:100%;border-collapse:collapse;\"><thead><tr><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Activity<\/th><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Typical evidence<\/th><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">What it does not automatically establish<\/th><\/tr><\/thead><tbody><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Assembly inspection<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Images or measurements of paste, placement, visible joints or hidden structure<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">That every circuit function operates correctly<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Electrical structural test<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Measured values, continuity or fault indications on covered circuits<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">That every product mode has been exercised<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Functional test<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Powered responses against defined inputs, loads and limits<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">All physical workmanship or all lifetime failure mechanisms<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Reliability qualification \/ screening<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Results under a specified stress or qualification plan<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">That a short routine production check is equivalent<\/td><\/tr><\/tbody><\/table><\/div><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Also separate bare-board electrical test from assembled-board test. A fabricator can verify a bare PCB against its electrical data before components are fitted. Assembly then introduces components, solder joints, programming and further handling. The earlier pass does not close those new risks.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">A usable test statement names the unit, revision, method, limits and result. It also identifies what was not tested. That last part is important: an honest exclusion gives engineering something to assess. A promise of complete testing with no coverage detail does not.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">For a buyer, the distinction changes the RFQ. Instead of asking for full testing, describe the required checks or ask the supplier to propose a coverage matrix. Give the product requirements and important failure modes so the proposal can be reviewed rather than guessed.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">For engineering, the same distinction prevents a test station from becoming a substitute for design validation. A production test should be capable of identifying defined faults efficiently. Demonstrating that the design is fit for every claimed application needs its own evidence and qualification plan.<\/p><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-8cf864f e-con-full e-flex e-con e-child\" data-id=\"8cf864f\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-7fa4e9c e-con-full e-flex e-con e-child\" data-id=\"7fa4e9c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-b4b0307 elementor-widget elementor-widget-text-editor\" data-id=\"b4b0307\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<div style=\"font-size:14px;line-height:1.78;color:#374151;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;\"><h2 style=\"font-size:22px;line-height:1.4;font-weight:700;color:#23282d;background:#dff5ff;border-left:4px solid #12b5ed;padding:10px 18px;margin:38px 0 16px;\">PCBA Test Methods: What Each One Can and Cannot Tell You<\/h2><div style=\"background:#eff6ff;border-left:4px solid #3b82f6;padding:18px 20px;margin:0 0 20px;border-radius:0 8px 8px 0;\"><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">A layered PCBA test strategy combines complementary evidence so that visible defects, electrical faults and required operating behaviors are not treated as the same problem.<\/p><\/div><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">The comparison below describes roles, not guaranteed detection rates. Actual coverage depends on the assembly, available access, program, equipment and acceptance rules. A camera or probe can only evaluate what its setup allows it to observe or measure.<\/p><div style=\"overflow-x:auto;margin:0 0 24px;\"><table style=\"font-size:14px;width:100%;border-collapse:collapse;\"><thead><tr><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Method<\/th><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Main role<\/th><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Useful for<\/th><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Important limitation<\/th><\/tr><\/thead><tbody><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">SPI<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Measure paste deposits before placement<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Printing volume, area, height or alignment checks as supported<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Does not inspect the final soldered joint<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">AOI<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Inspect visible component and solder features<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Missing\/shifted parts, readable polarity and visible anomalies<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Cannot fully observe hidden joints or prove electrical function<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">X-ray \/ CT<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Examine internal or obscured structure<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Selected hidden bridges, voids and structural features<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Detectability depends on geometry\/resolution; not a function test<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">ICT<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Apply programmed electrical tests through suitable access<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Covered shorts, opens, values and supported device checks<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Access, parallel paths and program limits restrict coverage<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\"><strong>Flying probe<\/strong><\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Move probes to programmed electrical targets<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Flexible electrical checks during development or changing builds<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Contact access and cycle time still need verification<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\"><strong>Boundary scan<\/strong><\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Use supported device test structures<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Certain digital interconnect checks with suitable devices and design<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Does not cover arbitrary nets or all device behavior<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">FCT<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Exercise the powered assembly<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Specified rails, I\/O, interfaces and application behavior<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Untested modes and limits remain outside the result<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Stress testing \/ screening<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Apply an agreed exposure or sequence<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Selected failure mechanisms under a defined plan<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Not a universal substitute for normal inspection or qualification<\/td><\/tr><\/tbody><\/table><\/div><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Do not turn this into a fixed ladder in which more expensive always means better. A test that cannot reach the important fault provides little value, regardless of its price. An inexpensive check that detects a likely assembly fault before powered testing may be highly useful.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">A method name alone is not enough. Two functional stations can differ in loads, instrument resolution, software and operating modes. Two ICT programs can cover different nodes on the same design. Ask for the actual plan and the exclusions.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Use the table to organize a technical review. For every important requirement, identify at least the proposed evidence, where it is generated and who approves an exception. Where coverage is intentionally omitted, record the justification rather than allowing the omission to remain invisible.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-47bd71b e-con-full e-flex e-con e-child\" data-id=\"47bd71b\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-37094b3 elementor-widget elementor-widget-image\" data-id=\"37094b3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"635\" src=\"https:\/\/jkrglo.com\/wp-content\/uploads\/2026\/06\/pcba-inspection-electrical-functional-layers.svg\" class=\"attachment-large size-large wp-image-4386\" alt=\"Complementary inspection, electrical and functional evidence in a PCBA test plan\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-9b475c0 e-con-full e-flex e-con e-child\" data-id=\"9b475c0\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-e2ed446 e-con-full e-flex e-con e-child\" data-id=\"e2ed446\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ec97903 elementor-widget elementor-widget-text-editor\" data-id=\"ec97903\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<div style=\"font-size:14px;line-height:1.78;color:#374151;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;\"><h2 style=\"font-size:22px;line-height:1.4;font-weight:700;color:#23282d;background:#dff5ff;border-left:4px solid #12b5ed;padding:10px 18px;margin:38px 0 16px;\">Common PCBA Defects: Match the Symptom to the Evidence<\/h2><div style=\"background:#eff6ff;border-left:4px solid #3b82f6;padding:18px 20px;margin:0 0 20px;border-radius:0 8px 8px 0;\"><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">A PCBA defect is a condition that fails an applicable assembly, electrical or product requirement; a visible anomaly or a void is not automatically a reject without the relevant criteria.<\/p><\/div><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Defects deserve their own section because the same symptom can have several causes. A dead rail might come from a bridge, an incorrect component, an open connection or a setup problem. Begin with a contained unit and a recorded observation, not an immediate change to the oven recipe.<\/p><div style=\"overflow-x:auto;margin:0 0 24px;\"><table style=\"font-size:14px;width:100%;border-collapse:collapse;\"><thead><tr><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Defect or observation<\/th><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Candidate detection route<\/th><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">What to investigate<\/th><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Boundary \/ caution<\/th><\/tr><\/thead><tbody><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Solder bridge<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Visual\/AOI where visible; suitable X-ray or electrical short check where hidden<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Paste deposition, stencil\/registration, placement and soldering conditions<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">A bridge beneath a package may not be optically visible<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Tombstoned passive<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Visual or AOI, with electrical evidence if required<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Unequal wetting forces, pad\/paste balance, component and thermal conditions<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Do not attribute every case to one reflow setting<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Open or insufficient joint<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Visible inspection where accessible; electrical tests; suitable structural analysis<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Paste, wetting, coplanarity, contamination and process history<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">A simple appearance check may miss an obscured discontinuity<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Voiding observation<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Appropriate X-ray views \/ CT if justified<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Material, pad\/aperture design, process and package guidance<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Acceptance depends on package, location and agreed measurement<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Wrong or missing component<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">BOM\/placement review, AOI where distinguishable, electrical or functional checks<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Material identity, feeder setup and released data<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Similar packages can hide a wrong electrical value<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Reversed polarity<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">AOI\/visual marking where readable; supported electrical\/function tests<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Part interpretation, library and setup verification<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Some polarity features are not optically accessible<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Component shift<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">AOI\/visual and downstream electrical evidence<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Placement, paste, handling, board support and soldering<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Choose the correction from evidence, not a generic fix list<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Intermittent connection<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Repeatable fault investigation, appropriate measurement and analysis<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Mechanical\/thermal conditions, joint or component damage, setup<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">A single passing run cannot dismiss the observation<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Wrong firmware \/ configuration<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Version verification and specified functional checks<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Image control, programming and change effectivity<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Correct soldering cannot establish the correct software<\/td><\/tr><\/tbody><\/table><\/div><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">The table is deliberately cautious about causes. Extending a preheat stage is not the universal remedy for voiding. Slowing a conveyor is not the universal remedy for placement shift. A change that helps one condition can move another feature outside its process window.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Preserve the fault evidence before rework. Record serial number, board revision, position, station result and relevant images. Otherwise an engineer may receive a repaired board and a story, but no way to verify the original failure or the effectiveness of the correction.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Use the agreed acceptance basis. A workmanship criterion, component recommendation and functional limit may address different questions. Where they conflict or leave a gap, resolve the specification before accepting or rejecting a lot.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">This defect-to-method map absorbs the practical topic of the former common-defects article. It should remain a clearly titled section so readers seeking a particular defect do not have to work through the whole test-selection discussion.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-2a34176 e-con-full e-flex e-con e-child\" data-id=\"2a34176\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e9a10a7 elementor-widget elementor-widget-image\" data-id=\"e9a10a7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"858\" height=\"1024\" src=\"https:\/\/jkrglo.com\/wp-content\/uploads\/2026\/06\/common-pcba-defects-microscope-panel.svg\" class=\"attachment-large size-large wp-image-4387\" alt=\"Representative solder bridge, tombstone, wrong-part and component-shift observations\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-8488732 e-con-full e-flex e-con e-child\" data-id=\"8488732\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-61634d9 e-con-full e-flex e-con e-child\" data-id=\"61634d9\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-11a2f56 elementor-widget elementor-widget-text-editor\" data-id=\"11a2f56\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<div style=\"font-size:14px;line-height:1.78;color:#374151;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;\"><h2 style=\"font-size:22px;line-height:1.4;font-weight:700;color:#23282d;background:#dff5ff;border-left:4px solid #12b5ed;padding:10px 18px;margin:38px 0 16px;\">SPI and AOI: Catch What Is Visible, Then Record the Reaction<\/h2><div style=\"background:#eff6ff;border-left:4px solid #3b82f6;padding:18px 20px;margin:0 0 20px;border-radius:0 8px 8px 0;\"><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Automated optical inspection compares visible assembly features with a programmed inspection model; the result depends on the views, references, limits and review rules used by that program.<\/p><\/div><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">SPI belongs before placement, where a printing issue can be investigated before it becomes a soldered assembly. Its value is not a universal percentage of defects prevented. Its value is a suitable measurement and a controlled reaction when the process leaves the approved conditions.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Ask which features are measured and how the recipe was approved. A board-wide average can conceal a difficult aperture. Review the feature that matters, the actual measurement and the action taken. The <a href=\"https:\/\/jkrglo.com\/what-is-solder-paste-inspection\/\" style=\"color:#2563eb;text-decoration:underline;\">solder paste inspection guide<\/a> explains that upstream checkpoint in more detail.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">After placement or soldering, AOI may detect missing, shifted or reversed parts and visible joint anomalies, depending on what the setup can see. Three-dimensional measurement can add information, but it does not remove the need for a validated recipe or make opaque package bodies transparent.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Check the review path as carefully as the detection. Who resolves a call? What record remains if it is judged acceptable? Can an operator bypass a repeated call without authorization? A system that produces many alarms but records little about disposition is difficult to audit.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Distinguish a false call from a defect escape. A false call is an inspection indication resolved as acceptable under the applicable rules. An escape is an unacceptable condition that passes a checkpoint. Lowering a threshold to reduce nuisance calls may change both; evaluate relevant examples before releasing the revised program.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Where parts look alike, optical inspection may not determine electrical identity. A resistor with the right package but the wrong value may need supported electrical measurement or other evidence. That is why AOI belongs in a coverage matrix rather than standing in for all testing.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">If a revision changes polarity marks, component height, mask color or placement, review whether the optical program remains valid. A familiar board name does not prove the current assembly is the one used to develop the recipe.<\/p><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-cd06ff8 e-con-full e-flex e-con e-child\" data-id=\"cd06ff8\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-bdae35e e-con-full e-flex e-con e-child\" data-id=\"bdae35e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c93b2e5 elementor-widget elementor-widget-text-editor\" data-id=\"c93b2e5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<div style=\"font-size:14px;line-height:1.78;color:#374151;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;\"><h2 style=\"font-size:22px;line-height:1.4;font-weight:700;color:#23282d;background:#dff5ff;border-left:4px solid #12b5ed;padding:10px 18px;margin:38px 0 16px;\">X-Ray and CT: Inspect Hidden Structure Without Overclaiming<\/h2><div style=\"background:#eff6ff;border-left:4px solid #3b82f6;padding:18px 20px;margin:0 0 20px;border-radius:0 8px 8px 0;\"><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">X-ray inspection evaluates features through differences in transmitted radiation, while CT reconstructs volumetric information from multiple projections; neither method directly proves the assembly&#8217;s electrical function.<\/p><\/div><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Hidden-joint inspection is relevant when package bodies or overlapping structures prevent a suitable optical view. The method has to resolve the defect of interest. Ask which views are used, what may overlap and how the interpretation is checked.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">A two-dimensional projection can be useful for some hidden solder observations. CT or another suitable technique may be justified when overlap or geometry makes that projection ambiguous. Do not make three-dimensional imaging a universal purchasing condition merely because the board contains a BGA.<\/p><div style=\"overflow-x:auto;margin:0 0 24px;\"><table style=\"font-size:14px;width:100%;border-collapse:collapse;\"><thead><tr><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Question<\/th><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Evidence to request<\/th><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Avoid concluding<\/th><\/tr><\/thead><tbody><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">What fault is being sought?<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Named feature and detection objective<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">One image proves every hidden joint sound<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Can the view resolve it?<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Representative views, method and limitations<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">All cracks or fine opens are always visible<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">How is voiding assessed?<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Package-specific criterion and measurement definition<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Projected area equals three-dimensional volume<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Who decides acceptance?<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Controlled limits, reviewer competence and disposition record<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">A supplier&#8217;s generic percentage overrides the contract<\/td><\/tr><\/tbody><\/table><\/div><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Voiding is especially easy to oversimplify. The significance depends on joint geometry, location, function and the applicable requirements. A percentage without a defined measurement method and relevant criterion is not an acceptance rule.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Do not write that all BGA or thermal-pad joints must meet one fixed volume limit under IPC. Different package categories and documents have different scopes. Use the contractually applicable requirements and component guidance; verify a numerical clause when it is needed.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">For a failed unit, relate the image to electrical symptoms and process history. Finding a visible internal feature is not always finding the root cause. A sound investigation tests whether the observation explains the failure and whether the proposed correction changes the result.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Our <a href=\"https:\/\/jkrglo.com\/using-3d-x-ray-axi-for-void-detection\/\" style=\"color:#2563eb;text-decoration:underline;\">3D X-ray and void inspection discussion<\/a> provides a focused starting point. Product-specific criteria and validated methods should still govern the decision.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-aff406e e-con-full e-flex e-con e-child\" data-id=\"aff406e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4580e95 elementor-widget elementor-widget-image\" data-id=\"4580e95\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"907\" height=\"1024\" src=\"https:\/\/jkrglo.com\/wp-content\/uploads\/2026\/06\/pcba-xray-projection-versus-ct.svg\" class=\"attachment-large size-large wp-image-4388\" alt=\"Difference between an X-ray projection and a reconstructed slice for a hidden-joint inspection question\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-dd9665f e-con-full e-flex e-con e-child\" data-id=\"dd9665f\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-18bf0d8 e-con-full e-flex e-con e-child\" data-id=\"18bf0d8\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-bc81eaf elementor-widget elementor-widget-text-editor\" data-id=\"bc81eaf\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<div style=\"font-size:14px;line-height:1.78;color:#374151;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;\"><h2 style=\"font-size:22px;line-height:1.4;font-weight:700;color:#23282d;background:#dff5ff;border-left:4px solid #12b5ed;padding:10px 18px;margin:38px 0 16px;\">ICT vs Flying Probe: Compare Access, Coverage and Real Cost<\/h2><div style=\"background:#eff6ff;border-left:4px solid #3b82f6;padding:18px 20px;margin:0 0 20px;border-radius:0 8px 8px 0;\"><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">In-circuit testing applies programmed electrical measurements through suitable board access to evaluate covered assembly faults; <strong>flying probe<\/strong> testing uses moving contacts to reach programmed targets without the same dedicated bed-of-nails fixture arrangement.<\/p><\/div><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">The central question is whether both proposals detect the faults you need. An apparent cost advantage is meaningless if one program excludes an important network or component. Review the covered tests, not just the number of probe targets.<\/p><div style=\"overflow-x:auto;margin:0 0 24px;\"><table style=\"font-size:14px;width:100%;border-collapse:collapse;\"><thead><tr><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Decision factor<\/th><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Fixture-based ICT<\/th><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Flying probe<\/th><\/tr><\/thead><tbody><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Physical contact<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Dedicated contact arrangement for the assembly<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Moving probes with appropriate access and board support<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Revision flexibility<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">May require fixture and program changes<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Program changes may be easier, but access still matters<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Cycle and throughput<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Can be efficient for a stable supported production route<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Movement and selected checks influence cycle time<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Cost structure<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Fixture, engineering, validation and maintenance<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Programming, support, handling and recurring time<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Best comparison basis<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Required coverage on the released assembly<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">The same required coverage and release evidence<\/td><\/tr><\/tbody><\/table><\/div><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Do not say flying probe is useless at volume or ICT is always uneconomical below a particular quantity. Product complexity, cycle time, design stability, mix and order pattern all affect the decision. Some assemblies justify a fixture early; others remain better suited to a flexible route.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Fixtureless does not mean no support, no tooling or no engineering. Moving probes still need safe contact targets, clearance, alignment and a way to hold the board. TAKAYA&#8217;s public materials describe programmed probing and supported measurements; they do not make every populated design accessible.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Parallel contact also does not mean every measurement is completed simultaneously. The tester architecture and program determine measurement sequencing. Ask for the quoted cycle on the actual test scope rather than deriving throughput from the probe count.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">A simple economic comparison is total engineering and fixture cost plus recurring test cost over the expected build quantity. Include maintenance, handling, debugging, revisions and the chance that a fixture is retired early. Only compare totals after the coverage is acceptable.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">For a stable design, confirm who owns and stores the fixture and who approves repairs or updates. For a changing design, confirm how revised data reaches the program and which regression checks are repeated. See the independent <a href=\"https:\/\/jkrglo.com\/what-is-an-in-circuit-test-ict\/\" style=\"color:#2563eb;text-decoration:underline;\"><strong>in-circuit test<\/strong> guide<\/a> for more detail without duplicating that topic here.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-298eb8f e-con-full e-flex e-con e-child\" data-id=\"298eb8f\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-81cdfc5 elementor-widget elementor-widget-image\" data-id=\"81cdfc5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"929\" height=\"1024\" src=\"https:\/\/jkrglo.com\/wp-content\/uploads\/2026\/06\/ict-versus-flying-probe-access.svg\" class=\"attachment-large size-large wp-image-4389\" alt=\"\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-03171ca e-con-full e-flex e-con e-child\" data-id=\"03171ca\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-956d673 e-con-full e-flex e-con e-child\" data-id=\"956d673\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e2220a9 elementor-widget elementor-widget-text-editor\" data-id=\"e2220a9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<div style=\"font-size:14px;line-height:1.78;color:#374151;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;\"><h2 style=\"font-size:22px;line-height:1.4;font-weight:700;color:#23282d;background:#dff5ff;border-left:4px solid #12b5ed;padding:10px 18px;margin:38px 0 16px;\">Functional Testing and Boundary Scan Answer Different Questions<\/h2><div style=\"background:#eff6ff;border-left:4px solid #3b82f6;padding:18px 20px;margin:0 0 20px;border-radius:0 8px 8px 0;\"><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\"><strong>Functional testing<\/strong> applies defined power, stimuli, loads and observations to determine whether an assembly meets the selected operating requirements under the stated test conditions.<\/p><\/div><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">A board that powers up is not necessarily functionally tested. Define what boot success means, which rails are measured, which interfaces are exercised and which error states must be checked. A status LED can be useful evidence, but only for the behavior it actually represents.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Write an input, expected response and limit for each required check. State the firmware image, configuration, timing and environmental conditions where relevant. If the station uses a simulated load or loopback, record what that simulation represents and what remains unverified.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Keep programming verification visible. A successful flash operation is not always sufficient evidence that the right version and options are present. The required identity check belongs in the record, especially when one hardware revision supports several customer configurations.<\/p><div style=\"overflow-x:auto;margin:0 0 24px;\"><table style=\"font-size:14px;width:100%;border-collapse:collapse;\"><thead><tr><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Check<\/th><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Specify<\/th><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Common gap<\/th><\/tr><\/thead><tbody><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Power \/ sequencing<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Supply conditions, current limits and required observations<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Checking only one steady-state voltage<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Communications<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Interfaces, traffic, timing and error behavior<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">A loopback treated as complete end-use validation<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Sensors \/ analog<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Stimulus, calibration state and measurement limits<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Accepting one nominal point for a range requirement<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Programming<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Approved image and identity\/configuration verification<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Logging only that a programming command completed<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Supported digital interconnect<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Boundary-scan architecture, access and covered faults<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Assuming every net supports scan-based testing<\/td><\/tr><\/tbody><\/table><\/div><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\"><strong>Boundary scan<\/strong> can add access to supported digital interconnects through device test structures. It requires compatible devices, design support, correct models and a suitable connection to the test system. It does not turn arbitrary analog circuits into observable scan networks.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Teradyne&#8217;s public Scan Pathfinder description identifies supported interconnect fault checks and access requirements. Keysight&#8217;s boundary-scan discussion also makes clear that a toolbox does not simply replace all ICT opens-and-shorts testing. These are complementary techniques, not interchangeable labels.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">For products with safety-related outputs or hazardous energy, have the responsible engineers define interlocks and safe test conditions. Production operators should not improvise loads or probing on a live assembly. A test procedure needs to be safe as well as informative.<\/p><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-d06114c e-con-full e-flex e-con e-child\" data-id=\"d06114c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-5d3a0ad e-con-full e-flex e-con e-child\" data-id=\"5d3a0ad\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-fd38e1a elementor-widget elementor-widget-text-editor\" data-id=\"fd38e1a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<div style=\"font-size:14px;line-height:1.78;color:#374151;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;\"><h2 style=\"font-size:22px;line-height:1.4;font-weight:700;color:#23282d;background:#dff5ff;border-left:4px solid #12b5ed;padding:10px 18px;margin:38px 0 16px;\">Design for Test Starts Before the Layout Is Released<\/h2><div style=\"background:#eff6ff;border-left:4px solid #3b82f6;padding:18px 20px;margin:0 0 20px;border-radius:0 8px 8px 0;\"><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\"><strong>Design for test<\/strong>, or DFT, is the planning of physical access, control, observability and test data so that the required checks can be performed safely and repeatably on the finished assembly.<\/p><\/div><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Ask the proposed test provider to review access while changes are still affordable. A node visible on a schematic may be inaccessible under a connector or inside the final mechanical arrangement. A point reachable by hand on one sample may be unsuitable for a repeatable fixture.<\/p><div style=\"overflow-x:auto;margin:0 0 24px;\"><table style=\"font-size:14px;width:100%;border-collapse:collapse;\"><thead><tr><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">DFT item<\/th><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Resolve before release<\/th><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Why it matters<\/th><\/tr><\/thead><tbody><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Targets and clearances<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Tester\/fixture-specific size, pitch, keep-out and side access<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">There is no universal 2.54 mm rule for every tester<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Board support<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Clamping, fiducials, warp and force considerations<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Reliable contact must not damage the assembly<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Power and control<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Safe supply access, isolation and operating modes<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">The station needs a controlled initial state<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Observability<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Signals or outputs that demonstrate required behavior<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">An unobservable function may need a design change<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Data package<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Net-aware data, schematic, BOM, drawings and revisions<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Gerber geometry alone may not define a complete electrical program<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Firmware and limits<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Released images, configuration and acceptance specification<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">A program cannot infer the product requirements from placement data<\/td><\/tr><\/tbody><\/table><\/div><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Accessible targets must meet the chosen system&#8217;s requirements. Exposed pads, vias, leads or connector pins may be usable in some arrangements, but contact size, spacing, mechanical support and surface condition still need review. Do not simply remove mask from every possible point without engineering approval.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Consider circuits that interfere with measurement. Parallel paths, protective devices, limited power domains or sensitive inputs can affect what an electrical result means. The test developer may need isolation, special modes or an alternative observation rather than a different probe position.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Provide data under revision control. A BOM used for sourcing, a placement file used for setup and the schematic used for testing should identify a consistent baseline. Where differences are intentional, record them as approved variants, not discrepancies left for the test engineer to interpret.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">The <a href=\"https:\/\/jkrglo.com\/pcb-design-basics\/\" style=\"color:#2563eb;text-decoration:underline;\">PCB design and manufacturing rules guide<\/a> covers the earlier design baseline. For testability, add a project-specific access review to that process rather than relying on a generic spacing checklist.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-97c26b5 e-con-full e-flex e-con e-child\" data-id=\"97c26b5\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-30feee7 elementor-widget elementor-widget-image\" data-id=\"30feee7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"906\" height=\"1024\" src=\"https:\/\/jkrglo.com\/wp-content\/uploads\/2026\/06\/pcba-design-for-test-access-map.svg\" class=\"attachment-large size-large wp-image-4390\" alt=\"DFT access map showing probe targets, keep-outs, board support and power access\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-f700f3e e-con-full e-flex e-con e-child\" data-id=\"f700f3e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-ef0bfc7 e-con-full e-flex e-con e-child\" data-id=\"ef0bfc7\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9fa418f elementor-widget elementor-widget-text-editor\" data-id=\"9fa418f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<div style=\"font-size:14px;line-height:1.78;color:#374151;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;\"><h2 style=\"font-size:22px;line-height:1.4;font-weight:700;color:#23282d;background:#dff5ff;border-left:4px solid #12b5ed;padding:10px 18px;margin:38px 0 16px;\">Build a Coverage Matrix Before Selecting the Final Route<\/h2><div style=\"background:#eff6ff;border-left:4px solid #3b82f6;padding:18px 20px;margin:0 0 20px;border-radius:0 8px 8px 0;\"><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">A <strong>test coverage<\/strong> matrix links each defined failure mode or requirement to a detection method, test condition, acceptance basis and retained record, including justified gaps.<\/p><\/div><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Start with what must not leave the factory. Then ask how each condition can be detected and where it is cheapest or safest to investigate. Early detection may reduce downstream work, but it does not justify removing later evidence needed for a different requirement.<\/p><div style=\"overflow-x:auto;margin:0 0 24px;\"><table style=\"font-size:14px;width:100%;border-collapse:collapse;\"><thead><tr><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Requirement \/ risk<\/th><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Proposed evidence<\/th><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Condition to confirm<\/th><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Record \/ owner<\/th><\/tr><\/thead><tbody><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Visible wrong orientation<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">AOI or controlled visual check<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">The mark and feature are actually visible<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Recipe\/review and release owner<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Hidden bridge<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Appropriate structural or electrical check<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Geometry and access support the proposed method<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Inspection or measured result<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Wrong passive value<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Supported electrical measurement or justified alternative<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Parallel paths and tolerance are accounted for<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Value\/limit\/program revision<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Firmware \/ variant identity<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Controlled programming and identity check<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Approved configuration matches the order<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Image\/configuration result<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Interface operation<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Defined functional exercise<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Stimulus, load and required operating state are represented<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Measured result \/ test owner<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Intermittent fault risk<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Product-specific analysis or validation plan<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Stress and observations address the suspected mechanism<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Investigation \/ qualification owner<\/td><\/tr><\/tbody><\/table><\/div><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">This is an illustrative structure, not a ready-approved plan for every board. Assign the actual methods to the actual design. Some faults may need more than one kind of evidence, and some requirements belong in design qualification rather than every-unit production testing.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Decide what runs on every unit, what is sampled and what is performed during qualification. Sampling is a risk decision with a defined plan, not an informal shortcut when the line is busy. Do not describe a sampled inspection as proof that every shipped unit received it.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Differentiate net coverage, component coverage, fault coverage and functional coverage. A high percentage of accessible nets does not mean the same percentage of product functions has been verified. If a supplier provides one coverage percentage, ask what the numerator and denominator contain.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">For prototypes, prioritize learning and safe evidence collection. For repeat production, qualify the intended station and control the recurring route. A move from <strong>flying probe<\/strong> to ICT is a change to verify, not evidence that the original boards were untested.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Keep the matrix alive. A component substitution, firmware change or process change may affect the assumptions behind a check. Review the relevant rows instead of assuming the unchanged product name means unchanged test coverage.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-10ad5c5 e-con-full e-flex e-con e-child\" data-id=\"10ad5c5\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4caee9a elementor-widget elementor-widget-image\" data-id=\"4caee9a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"643\" height=\"1024\" src=\"https:\/\/jkrglo.com\/wp-content\/uploads\/2026\/06\/pcba-test-coverage-and-gaps.svg\" class=\"attachment-large size-large wp-image-4391\" alt=\"Failure modes mapped to test methods, conditions, records and explicit coverage gaps\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-ea21b92 e-con-full e-flex e-con e-child\" data-id=\"ea21b92\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-bb61eef e-con-full e-flex e-con e-child\" data-id=\"bb61eef\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-fe73ce5 elementor-widget elementor-widget-text-editor\" data-id=\"fe73ce5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<div style=\"font-size:14px;line-height:1.78;color:#374151;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;\"><h2 style=\"font-size:22px;line-height:1.4;font-weight:700;color:#23282d;background:#dff5ff;border-left:4px solid #12b5ed;padding:10px 18px;margin:38px 0 16px;\">Failed Units, Retesting and Root Cause: Preserve the First Result<\/h2><div style=\"background:#eff6ff;border-left:4px solid #3b82f6;padding:18px 20px;margin:0 0 20px;border-radius:0 8px 8px 0;\"><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Retesting is a repeat application of a defined test after an authorized event or disposition; it should preserve the original result and the reason for repeating the check.<\/p><\/div><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">A failing board should move into a controlled status, not back into the input queue until it happens to pass. Record the original result, identify the unit and contain affected material according to the plan. The next action depends on whether the evidence points to a product fault, contact problem, setup problem or uncertain result.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">A fixture contact issue is possible. So is a real intermittent fault. The distinction needs evidence. Check contact condition, alignment, calibration status and station diagnostics under a defined procedure; do not silently erase a failure because the second run was green.<\/p><div style=\"overflow-x:auto;margin:0 0 24px;\"><table style=\"font-size:14px;width:100%;border-collapse:collapse;\"><thead><tr><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Event<\/th><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Required action<\/th><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Evidence to retain<\/th><\/tr><\/thead><tbody><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Initial fail<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Identify and contain unit \/ affected scope<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">First measurement, limit, code and station revision<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Suspected station issue<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Verify setup under an authorized procedure<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Diagnostic result and decision<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Confirmed assembly defect<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Authorize correction or other disposition<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Location, cause evidence and rework record<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Post-rework check<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Repeat affected checks and agreed regression scope<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">New result linked to original failure<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Recurring pattern<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Review lot\/process risk and corrective action<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Counts, containment and effectiveness evidence<\/td><\/tr><\/tbody><\/table><\/div><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Root cause is not the same as the defect name. Solder bridge describes the observed condition; it does not establish why the bridge occurred or why the inspection failed to contain it. Investigate both the creation mechanism and the escape mechanism when that distinction matters.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">A process correction needs an effectiveness check. If a stencil or reflow change is made, define what subsequent data will show that the correction worked without creating a new problem. Avoid closing a corrective action solely because a report was issued.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Repaired units should remain traceable to the authorized disposition. The <strong>retest<\/strong> scope should account for what the intervention could affect, not merely repeat whichever check failed first. A local joint repair can disturb neighboring features; the appropriate review is product-specific.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">For field failures that pass routine tests, preserve the use conditions and symptom. Consider operating states, thermal\/mechanical exposure, firmware, components and the station itself. Do not jump from passed FCT to a diagnosis of micro-cracks or voids without supporting analysis.<\/p><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-a981594 e-con-full e-flex e-con e-child\" data-id=\"a981594\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-a54f882 e-con-full e-flex e-con e-child\" data-id=\"a54f882\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f7d7a1f elementor-widget elementor-widget-text-editor\" data-id=\"f7d7a1f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<div style=\"font-size:14px;line-height:1.78;color:#374151;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;\"><h2 style=\"font-size:22px;line-height:1.4;font-weight:700;color:#23282d;background:#dff5ff;border-left:4px solid #12b5ed;padding:10px 18px;margin:38px 0 16px;\">Define Yield and Test Records So Two Suppliers Can Be Compared<\/h2><div style=\"background:#eff6ff;border-left:4px solid #3b82f6;padding:18px 20px;margin:0 0 20px;border-radius:0 8px 8px 0;\"><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\"><strong>First-pass yield<\/strong> is the fraction of units that pass a defined process or test scope on the first attempt; final yield may include units that pass after authorized correction or <strong>retest<\/strong>.<\/p><\/div><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">The definitions matter more than a headline percentage. A supplier reporting a first-pass functional result is not reporting the same thing as a supplier reporting final shipment acceptance after rework. Both records can be useful, but they answer different questions.<\/p><div style=\"overflow-x:auto;margin:0 0 24px;\"><table style=\"font-size:14px;width:100%;border-collapse:collapse;\"><thead><tr><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Metric \/ record<\/th><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Specify<\/th><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Potential misunderstanding<\/th><\/tr><\/thead><tbody><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">First-pass yield<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Scope, period, first attempt and denominator<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Repaired passes quietly included<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Final yield<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Disposition and units counted<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">A high final result hides repeated rework<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Defect count<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Board, joint, component or opportunity basis<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Different denominators compared as one rate<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">False calls \/ station issues<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Definition and approved resolution categories<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Station problems mixed with product defects<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Unit record<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Serial\/lot, revisions, limits, measurements and status<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">A summary pass with no recoverable context<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Retention \/ retrieval<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Agreed duration, access and customer reporting<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Records exist but cannot be tied to a shipment<\/td><\/tr><\/tbody><\/table><\/div><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Ask for raw counts alongside the percentage. A small pilot can produce a dramatic percentage from one board. Large-volume trends and early builds should not be compared without the population and conditions behind them.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">A useful unit record identifies the hardware and firmware baseline, station or program revision, applicable limits, time and result. Include measured values where required by the plan. The exact data scope and retention period belong in the agreement rather than being assumed.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\"><strong>Test limits<\/strong> need controlled ownership. If engineering changes a limit, preserve the justification, effective version and validation. Otherwise a trend can appear to improve simply because the pass boundary moved.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">When asking a manufacturing partner for data, allow appropriate redaction of other customers&#8217; identities while still requiring evidence for your own job. The <a href=\"https:\/\/jkrglo.com\/how-to-choose-a-pcba-manufacturer\/\" style=\"color:#2563eb;text-decoration:underline;\">PCBA supplier qualification guide<\/a> explains how to sample records rather than relying on a capability brochure.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">No single universal FPY target describes all products, stages and mixes. Set project requirements with a clear baseline and improvement process. Do not present an unsupported industry percentage as a promise for every build.<\/p><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-46a9ae1 e-con-full e-flex e-con e-child\" data-id=\"46a9ae1\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-5bb293e e-con-full e-flex e-con e-child\" data-id=\"5bb293e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-06d18a1 elementor-widget elementor-widget-text-editor\" data-id=\"06d18a1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<div style=\"font-size:14px;line-height:1.78;color:#374151;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;\"><h2 style=\"font-size:22px;line-height:1.4;font-weight:700;color:#23282d;background:#dff5ff;border-left:4px solid #12b5ed;padding:10px 18px;margin:38px 0 16px;\">What Drives PCBA Test Cost? Scope Comes Before the Price<\/h2><div style=\"background:#eff6ff;border-left:4px solid #3b82f6;padding:18px 20px;margin:0 0 20px;border-radius:0 8px 8px 0;\"><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">The cost of <strong>PCBA testing<\/strong> combines development and tooling with recurring execution, handling, maintenance and failure-disposition work for a defined coverage scope.<\/p><\/div><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Request a quotation that separates one-time engineering from recurring test. A fixture, programming effort or custom load may be a development cost. Running a lengthy measurement sequence, handling boards and maintaining contacts continue through production.<\/p><div style=\"overflow-x:auto;margin:0 0 24px;\"><table style=\"font-size:14px;width:100%;border-collapse:collapse;\"><thead><tr><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Cost element<\/th><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Clarify<\/th><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Why it changes the comparison<\/th><\/tr><\/thead><tbody><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Engineering \/ fixtures<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Program, hardware, validation, ownership and lead time<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Two quotes may include different deliverables<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Execution<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Defined sequence, handling and cycle assumptions<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">A shortened sequence is not always an efficiency gain<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Revision<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Software, fixture and regression changes<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Frequent design changes can alter total economics<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Maintenance<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Contacts, calibration, reference artifacts and storage<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Upkeep does not disappear after fixture purchase<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Failure handling<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Diagnosis, rework authorization and <strong>retest<\/strong><\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">A low test price can exclude the work needed to release units<\/td><\/tr><\/tbody><\/table><\/div><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Avoid choosing methods solely from unit-count bands. The decision depends on acceptable coverage, stable lifetime volume, cycle time, access and revision risk. The <a href=\"https:\/\/jkrglo.com\/how-much-does-pcb-assembly-cost\/\" style=\"color:#2563eb;text-decoration:underline;\">PCB assembly cost guide<\/a> provides broader quotation context; the test scope still needs its own comparison.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">If comparing fixture-based and moving-probe routes, calculate the economic crossover only after confirming both meet the requirement. Use actual quoted engineering and recurring costs, not a universal dollar range copied from a different product.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Agree who supplies reference units, firmware, loads, peripherals and expected responses. A supplier cannot validate an application-specific behavior from Gerbers alone. Missing test inputs can become schedule risk even when the assembly files are complete.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">The lowest-cost defensible plan is not the plan with the fewest station names. It is the one that supplies the necessary evidence without redundant work, uncontrolled assumptions or unpriced gaps.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-de6a513 e-con-full e-flex e-con e-child\" data-id=\"de6a513\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-042507b elementor-widget elementor-widget-image\" data-id=\"042507b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"942\" height=\"1024\" src=\"https:\/\/jkrglo.com\/wp-content\/uploads\/2026\/06\/pcba-test-cost-scope-diagram.svg\" class=\"attachment-large size-large wp-image-4395\" alt=\"One-time test engineering and recurring execution costs compared at an equivalent coverage scope\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-a44aa83 e-con-full e-flex e-con e-child\" data-id=\"a44aa83\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-c91330e e-con-full e-flex e-con e-child\" data-id=\"c91330e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4669224 elementor-widget elementor-widget-text-editor\" data-id=\"4669224\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<div style=\"font-size:14px;line-height:1.78;color:#374151;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;\"><h2 style=\"font-size:22px;line-height:1.4;font-weight:700;color:#23282d;background:#dff5ff;border-left:4px solid #12b5ed;padding:10px 18px;margin:38px 0 16px;\">A PCBA Test Release Checklist for the Next Build<\/h2><div style=\"background:#eff6ff;border-left:4px solid #3b82f6;padding:18px 20px;margin:0 0 20px;border-radius:0 8px 8px 0;\"><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">A test release package is the approved combination of requirements, programs, fixtures, references and disposition rules needed to run the intended production checks consistently.<\/p><\/div><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Before the build, make sure the test developer, manufacturing team and product owner agree on the same baseline. Resolve open questions about limits, coverage and release authority before boards arrive at the station.<\/p><div style=\"overflow-x:auto;margin:0 0 24px;\"><table style=\"font-size:14px;width:100%;border-collapse:collapse;\"><thead><tr><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Release item<\/th><th style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;background:#eff6ff;border:1px solid #dbeafe;font-weight:700;color:#1e3a8a;\">Evidence needed<\/th><\/tr><\/thead><tbody><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Requirements and coverage<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Approved matrix, exclusions and applicable criteria<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Data baseline<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Consistent schematic, BOM, assembly data and firmware<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Access and equipment<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">DFT review, support, safe connections and suitable instruments<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Program qualification<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Known acceptable references and relevant controlled fault checks where appropriate<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Failure workflow<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Containment, review, rework and <strong>retest<\/strong> permissions<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Pilot \/ release<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#fcfcfd;\">Representative results, open findings and authorized decision<\/td><\/tr><tr><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Records<\/td><td style=\"font-size:14px;line-height:1.6;padding:11px 12px;vertical-align:top;text-align:left;border:1px solid #e5e7eb;color:#374151;background:#ffffff;\">Traceable results, revisions, retention and retrieval agreement<\/td><\/tr><\/tbody><\/table><\/div><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Reference assemblies and controlled fault examples can help qualify a station, but they also need control. A reference board can age or change. A deliberately introduced fault may not represent every natural failure. Use these artifacts to verify the stated checks, not to claim universal coverage.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">For a JKRGLO project, provide the current manufacturing package, expected quantities, required behaviors and any existing test specification. Ask for a proposed inspection and electrical test route with exclusions, required inputs and responsibility for development.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\"><a href=\"https:\/\/jkrglo.com\/contact-us\/\" style=\"color:#2563eb;text-decoration:underline;\">Send the assembly and test requirements to JKRGLO<\/a> for a scoped review before production. This is a request to establish project capability and responsibilities, not an assertion that every possible test is included as standard.<\/p><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\"><strong>Technical references.<\/strong> Public equipment descriptions help establish method scope, not universal coverage: <a href=\"https:\/\/www.takaya.co.jp\/fa\/news\/product-news\/t400j\/\" style=\"color:#2563eb;text-decoration:underline;\">TAKAYA flying-probe product description<\/a>; <a href=\"https:\/\/www.teradyne.com\/products\/test-solutions\/production-board-test\/library\/scan-pathfinder-ii-faq\" style=\"color:#2563eb;text-decoration:underline;\">Teradyne Scan Pathfinder II FAQ<\/a>; <a href=\"https:\/\/www.keysight.com\/vn\/en\/assets\/7018-05111\/article-reprints\/5992-1339.pdf\" style=\"color:#2563eb;text-decoration:underline;\">Keysight boundary-scan discussion<\/a>. Apply the actual product specification and qualified station requirements to the build.<\/p><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-a38c213 e-con-full e-flex e-con e-child\" data-id=\"a38c213\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-311cbc3 e-con-full e-flex e-con e-child\" data-id=\"311cbc3\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-bc85bee elementor-widget elementor-widget-text-editor\" data-id=\"bc85bee\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<div style=\"font-size:14px;line-height:1.78;color:#374151;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;\"><h2 style=\"font-size:22px;line-height:1.4;font-weight:700;color:#23282d;background:#dff5ff;border-left:4px solid #12b5ed;padding:10px 18px;margin:38px 0 16px;\">PCBA Testing: Frequently Asked Questions<\/h2><h3 style=\"font-size:17px;line-height:1.45;font-weight:700;color:#111827;margin:26px 0 8px;\">1. What is PCBA testing?<\/h3><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\"><strong>PCBA testing<\/strong> applies defined electrical or functional checks to an assembled board. In a wider quality plan, it is combined with inspections such as SPI, AOI and suitable X-ray where needed. The approved scope should identify the faults and behaviors checked, the limits and the records retained.<\/p><h3 style=\"font-size:17px;line-height:1.45;font-weight:700;color:#111827;margin:26px 0 8px;\">2. What is the difference between PCB and PCBA testing?<\/h3><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Bare-board PCB testing checks the fabricated interconnect before assembly. PCBA testing addresses the populated board, including components, solder connections, programming and required operation. A bare-board pass does not verify work added during assembly.<\/p><h3 style=\"font-size:17px;line-height:1.45;font-weight:700;color:#111827;margin:26px 0 8px;\">3. Is AOI enough to test a PCBA?<\/h3><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Not generally. AOI evaluates features visible to its programmed imaging setup. It does not fully inspect hidden joints or prove electrical function. Determine which electrical and functional checks the product requires rather than assuming an optical pass closes every risk.<\/p><h3 style=\"font-size:17px;line-height:1.45;font-weight:700;color:#111827;margin:26px 0 8px;\">4. What are the common PCBA defects?<\/h3><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Common assembly concerns include solder bridges, tombstoned or shifted components, opens, insufficient joints, wrong parts and reversed polarity. Voiding and contamination observations need the applicable acceptance criteria. Programming or configuration errors can also make a physically correct board unsuitable for shipment.<\/p><h3 style=\"font-size:17px;line-height:1.45;font-weight:700;color:#111827;margin:26px 0 8px;\">5. Is ICT better than flying probe?<\/h3><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Neither is universally better. Compare required coverage, access, design stability, recurring volume, cycle time and total cost. Fixture-based ICT can be attractive for stable recurring work; moving probes can offer flexibility. The actual program and assembly determine the result.<\/p><h3 style=\"font-size:17px;line-height:1.45;font-weight:700;color:#111827;margin:26px 0 8px;\">6. Does a flying-probe test need dedicated test pads?<\/h3><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Not always; suitable accessible vias, leads, pads or contacts may be usable depending on the equipment and design. Targets still need adequate contact geometry, clearance and support. Confirm the access plan with the test provider before release.<\/p><h3 style=\"font-size:17px;line-height:1.45;font-weight:700;color:#111827;margin:26px 0 8px;\">7. Does every BGA board need CT inspection?<\/h3><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">No. Choose a method that can resolve the relevant feature and defect. Some questions can be addressed with suitable projection views or electrical evidence; others need more detailed imaging or analysis. Agree the inspection objective and limits rather than imposing one method on every package.<\/p><h3 style=\"font-size:17px;line-height:1.45;font-weight:700;color:#111827;margin:26px 0 8px;\">8. Can functional testing detect every defect?<\/h3><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">No. <strong>Functional testing<\/strong> checks the specified behaviors under the programmed conditions. Untested modes, intermittent mechanisms and some structural defects may remain outside its coverage. Define the scope and combine it with other evidence where required.<\/p><h3 style=\"font-size:17px;line-height:1.45;font-weight:700;color:#111827;margin:26px 0 8px;\">9. Why can a board pass testing and fail later?<\/h3><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">A fault may lie outside the tested conditions, arise intermittently or develop after exposure. Programming, components, environment and the station itself can also matter. Preserve the symptom and investigate; a later failure does not by itself establish one particular solder-joint cause.<\/p><h3 style=\"font-size:17px;line-height:1.45;font-weight:700;color:#111827;margin:26px 0 8px;\">10. Should a failed board simply be tested again?<\/h3><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Only under an authorized <strong>retest<\/strong> procedure that preserves the original result and records the reason. Verify suspected station problems, contain product defects and link any rework to the subsequent checks. Repeating until pass is not a controlled release method.<\/p><h3 style=\"font-size:17px;line-height:1.45;font-weight:700;color:#111827;margin:26px 0 8px;\">11. What files are needed for PCBA test development?<\/h3><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Provide consistent schematic and net-aware design data, controlled BOM, assembly information, firmware and the product test requirements. Include expected responses, limits and known exclusions. Geometry files alone may not provide the connectivity or functional intent needed for a complete program.<\/p><h3 style=\"font-size:17px;line-height:1.45;font-weight:700;color:#111827;margin:26px 0 8px;\">12. How much does PCBA testing cost?<\/h3><p style=\"font-size:14px;line-height:1.78;margin:0 0 16px;\">Cost depends on development, fixtures, access, sequence, handling, recurring cycle time, maintenance and failure handling. Ask for a separated quote at the agreed coverage. There is no universal unit price or fixed production quantity at which one method becomes mandatory.<\/p><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-979f534 e-con-full e-flex e-con e-child\" data-id=\"979f534\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-dc70350 e-con-full e-flex e-con e-child\" data-id=\"dc70350\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t<div class=\"elementor-element elementor-element-7899081 e-con-full e-flex e-con e-child\" data-id=\"7899081\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-23db2e9 elementor-widget elementor-widget-image\" data-id=\"23db2e9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"400\" height=\"400\" src=\"https:\/\/jkrglo.com\/wp-content\/uploads\/2026\/08\/\u672a\u6807\u9898-9.jpg\" class=\"attachment-large size-large wp-image-3757\" alt=\"\" srcset=\"https:\/\/jkrglo.com\/wp-content\/uploads\/2026\/08\/\u672a\u6807\u9898-9.jpg 400w, https:\/\/jkrglo.com\/wp-content\/uploads\/2026\/08\/\u672a\u6807\u9898-9-300x300.jpg 300w, https:\/\/jkrglo.com\/wp-content\/uploads\/2026\/08\/\u672a\u6807\u9898-9-150x150.jpg 150w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-5833f11 e-con-full e-flex e-con e-child\" data-id=\"5833f11\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-c6cd9e2 e-con-full e-flex e-con e-child\" data-id=\"c6cd9e2\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-60e6e15 elementor-widget elementor-widget-heading\" data-id=\"60e6e15\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">About the Author<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-c2bc0be e-con-full e-flex e-con e-child\" data-id=\"c2bc0be\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3d7caa2 elementor-widget elementor-widget-text-editor\" data-id=\"3d7caa2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Andrew Zhan &#8211;\u00a0 R&amp;D Engineer at JKRGLO.com<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-ae7b1e9 e-con-full e-flex e-con e-child\" data-id=\"ae7b1e9\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-67605bf elementor-widget elementor-widget-text-editor\" data-id=\"67605bf\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>With over 14 years of R&amp;D engineering experience in the PCB industry, Andrew Zhan brings deep expertise in circuit design optimization and DFM implementation. He focuses on translating complex design requirements into production-ready solutions, driving technical innovation for both prototype and mass production.<br \/>Working closely with cross-functional teams and clients, he ensures rigorous quality validation and seamless technical communication across the full project lifecycle. Andrew is committed to delivering reliable, high-performance PCB solutions that consistently exceed customer expectations.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-47e9ae48 e-con-full e-flex e-con e-child\" data-id=\"47e9ae48\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;sticky&quot;:&quot;top&quot;,&quot;sticky_offset&quot;:93,&quot;animation&quot;:&quot;none&quot;,&quot;sticky_on&quot;:[&quot;desktop&quot;,&quot;laptop&quot;,&quot;tablet&quot;,&quot;mobile&quot;],&quot;sticky_effects_offset&quot;:0,&quot;sticky_anchor_link_offset&quot;:0}\">\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-40c24d4b e-con-full e-flex e-con e-child\" data-id=\"40c24d4b\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;animation&quot;:&quot;none&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-23b92067 elementor-toc--content-ellipsis elementor-toc--minimized-on-tablet elementor-widget elementor-widget-table-of-contents\" data-id=\"23b92067\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;exclude_headings_by_selector&quot;:[],&quot;no_headings_message&quot;:&quot;\\u5728\\u6b64\\u9875\\u9762\\u4e0a\\u627e\\u4e0d\\u5230\\u6807\\u9898\\u3002&quot;,&quot;headings_by_tags&quot;:[&quot;h2&quot;],&quot;marker_view&quot;:&quot;bullets&quot;,&quot;collapse_subitems&quot;:&quot;yes&quot;,&quot;min_height&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:205,&quot;sizes&quot;:[]},&quot;icon&quot;:{&quot;value&quot;:&quot;fas fa-circle&quot;,&quot;library&quot;:&quot;fa-solid&quot;,&quot;rendered_tag&quot;:&quot;&lt;svg class=\\&quot;e-font-icon-svg e-fas-circle\\&quot; viewBox=\\&quot;0 0 512 512\\&quot; xmlns=\\&quot;http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\&quot;&gt;&lt;path d=\\&quot;M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\\&quot;&gt;&lt;\\\/path&gt;&lt;\\\/svg&gt;&quot;},&quot;minimize_box&quot;:&quot;yes&quot;,&quot;minimized_on&quot;:&quot;tablet&quot;,&quot;hierarchical_view&quot;:&quot;yes&quot;,&quot;min_height_laptop&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]}}\" data-widget_type=\"table-of-contents.default\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__header\">\n\t\t\t\t\t\t<h2 class=\"elementor-toc__header-title\">\n\t\t\t\tTable of Contents\t\t\t<\/h2>\n\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--expand\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__23b92067\" aria-expanded=\"true\" aria-label=\"Apri l&#039;indice\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-down\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M207.029 381.476L12.686 187.132c-9.373-9.373-9.373-24.569 0-33.941l22.667-22.667c9.357-9.357 24.522-9.375 33.901-.04L224 284.505l154.745-154.021c9.379-9.335 24.544-9.317 33.901.04l22.667 22.667c9.373 9.373 9.373 24.569 0 33.941L240.971 381.476c-9.373 9.372-24.569 9.372-33.942 0z\"><\/path><\/svg><\/div>\n\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--collapse\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__23b92067\" aria-expanded=\"true\" aria-label=\"Chiudi l&#039;indice\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-up\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M240.971 130.524l194.343 194.343c9.373 9.373 9.373 24.569 0 33.941l-22.667 22.667c-9.357 9.357-24.522 9.375-33.901.04L224 227.495 69.255 381.516c-9.379 9.335-24.544 9.317-33.901-.04l-22.667-22.667c-9.373-9.373-9.373-24.569 0-33.941L207.03 130.525c9.372-9.373 24.568-9.373 33.941-.001z\"><\/path><\/svg><\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<div id=\"elementor-toc__23b92067\" class=\"elementor-toc__body elementor-toc__list-items--collapsible\">\n\t\t\t<div class=\"elementor-toc__spinner-container\">\n\t\t\t\t<svg class=\"elementor-toc__spinner eicon-animation-spin e-font-icon-svg e-eicon-loading\" aria-hidden=\"true\" viewBox=\"0 0 1000 1000\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M500 975V858C696 858 858 696 858 500S696 142 500 142 142 304 142 500H25C25 237 238 25 500 25S975 237 975 500 763 975 500 975Z\"><\/path><\/svg>\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-343d5b2 e-flex e-con-boxed e-con e-parent\" data-id=\"343d5b2\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-83f777b e-con-full e-flex e-con e-child\" data-id=\"83f777b\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a465875 elementor-widget elementor-widget-text-editor\" data-id=\"a465875\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Still, need help? Contact Us:\u00a0<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fc920e7 elementor-widget elementor-widget-text-editor\" data-id=\"fc920e7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"color: #800000;\"><a style=\"color: #800000; text-decoration: none;\" href=\"mailto:wm-sale03@jkr.net.cn\">wm-sale03@jkr.net.cn<\/a><br \/><\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-b069090 e-con-full e-flex e-con e-child\" data-id=\"b069090\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9ad94a8 elementor-widget elementor-widget-text-editor\" data-id=\"9ad94a8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Need a PCB or PCBA quote?\u00a0\u00a0<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6c55c5a elementor-widget elementor-widget-text-editor\" data-id=\"6c55c5a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><a style=\"text-decoration: none;\" href=\"https:\/\/jkrglo.com\/contact-us\/\"><span style=\"color: #800000;\">Quote now<\/span><br \/><\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>PCBA Testing: What Each Method Catches, What It Misses, and How to Choose Facebook X-twitter Youtube Quick answer PCBA testing 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