{"id":2915,"date":"2026-04-18T08:10:36","date_gmt":"2026-04-18T08:10:36","guid":{"rendered":"https:\/\/www.advantage.co.th\/?p=2915"},"modified":"2026-04-18T08:10:44","modified_gmt":"2026-04-18T08:10:44","slug":"major-scrap-ng-sources-in-pcb-pcba-smt-factories","status":"publish","type":"post","link":"https:\/\/www.advantage.co.th\/en\/major-scrap-ng-sources-in-pcb-pcba-smt-factories\/","title":{"rendered":"Major Scrap \/ NG Sources in PCB (PCBA\/SMT) Factories"},"content":{"rendered":"\n<p>Scrap and NG (Non-Good) in a PCB\/PCBA factory don\u2019t come from one single issue\u2014they\u2019re usually a combination of design gaps, process variation, material defects, and handling problems.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>1. Soldering Defects (Top Contributor)<\/strong><\/h2>\n\n\n\n<p>This is usually the <strong>#1 scrap driver<\/strong> in SMT lines.<\/p>\n\n\n\n<p><strong>Common issues:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Solder bridges (short circuits)<\/li>\n\n\n\n<li>Insufficient solder \/ open joints<\/li>\n\n\n\n<li>Cold solder joints<\/li>\n\n\n\n<li>Tombstoning (chip components lifting)<\/li>\n\n\n\n<li>Voids in BGA\/QFN packages<\/li>\n<\/ul>\n\n\n\n<p><strong>Root causes:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Poor stencil design or aperture size<\/li>\n\n\n\n<li>Incorrect solder paste printing parameters<\/li>\n\n\n\n<li>Reflow profile not optimized<\/li>\n\n\n\n<li>PCB pad design issues (DFM problem)<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>2. Component Placement Defects<\/strong><\/h2>\n\n\n\n<p>Errors during pick-and-place process.<\/p>\n\n\n\n<p><strong>Typical NGs:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Misalignment<\/li>\n\n\n\n<li>Missing components<\/li>\n\n\n\n<li>Wrong polarity (e.g., diodes, ICs)<\/li>\n\n\n\n<li>Wrong component loaded<\/li>\n<\/ul>\n\n\n\n<p><strong>Root causes:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Feeder setup errors<\/li>\n\n\n\n<li>Vision system miscalibration<\/li>\n\n\n\n<li>Program errors in placement machine<\/li>\n\n\n\n<li>Operator mistakes<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>3. PCB Fabrication Defects<\/strong><\/h2>\n\n\n\n<p>Incoming PCB quality has a big impact.<\/p>\n\n\n\n<p><strong>Common defects:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Open\/short circuits in traces<\/li>\n\n\n\n<li>Delamination<\/li>\n\n\n\n<li>Solder mask misalignment<\/li>\n\n\n\n<li>Warpage \/ bow &amp; twist<\/li>\n\n\n\n<li>Pad lifting<\/li>\n<\/ul>\n\n\n\n<p><strong>Root causes:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Supplier process issues<\/li>\n\n\n\n<li>Poor material quality<\/li>\n\n\n\n<li>Improper storage (moisture absorption)<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>4. ESD (Electrostatic Discharge) Damage<\/strong><\/h2>\n\n\n\n<p>Silent but very critical\u2014often leads to latent failures.<\/p>\n\n\n\n<p><strong>Effects:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>IC damage (immediate or latent)<\/li>\n\n\n\n<li>Reduced product reliability<\/li>\n<\/ul>\n\n\n\n<p><strong>Root causes:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Lack of ESD controls (grounding, wrist straps)<\/li>\n\n\n\n<li>Poor handling practices<\/li>\n\n\n\n<li>Inadequate EPA (ESD Protected Area)<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>5. Reflow \/ Thermal Process Issues<\/strong><\/h2>\n\n\n\n<p>Improper heating profile causes multiple defects.<\/p>\n\n\n\n<p><strong>Typical NGs:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Component damage<\/li>\n\n\n\n<li>Solder cracks<\/li>\n\n\n\n<li>PCB warpage<\/li>\n\n\n\n<li>Head-in-pillow (BGA)<\/li>\n<\/ul>\n\n\n\n<p><strong>Root causes:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Incorrect temperature profile<\/li>\n\n\n\n<li>Uneven heating<\/li>\n\n\n\n<li>Poor oven calibration<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>6. Contamination &amp; Cleanliness Issues<\/strong><\/h2>\n\n\n\n<p>Often overlooked but critical in high-reliability products.<\/p>\n\n\n\n<p><strong>Examples:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Flux residue<\/li>\n\n\n\n<li>Dust or foreign particles<\/li>\n\n\n\n<li>Ionic contamination<\/li>\n<\/ul>\n\n\n\n<p><strong>Impact:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Corrosion<\/li>\n\n\n\n<li>Leakage current<\/li>\n\n\n\n<li>Field failures<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>7. Mechanical Damage \/ Handling Issues<\/strong><\/h2>\n\n\n\n<p>Occurs during manual or automated handling.<\/p>\n\n\n\n<p><strong>Common NGs:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Scratches on PCB<\/li>\n\n\n\n<li>Broken components<\/li>\n\n\n\n<li>Connector damage<\/li>\n\n\n\n<li>Bent pins<\/li>\n<\/ul>\n\n\n\n<p><strong>Root causes:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Poor packaging<\/li>\n\n\n\n<li>Improper handling<\/li>\n\n\n\n<li>Lack of fixtures or protection<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>8. Testing Failures (ICT \/ FCT \/ Functional)<\/strong><\/h2>\n\n\n\n<p>Final stage where hidden defects appear.<\/p>\n\n\n\n<p><strong>Failures include:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>No power \/ dead board<\/li>\n\n\n\n<li>Signal failure<\/li>\n\n\n\n<li>Communication issues<\/li>\n\n\n\n<li>Intermittent faults<\/li>\n<\/ul>\n\n\n\n<p><strong>Root causes:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Upstream process defects<\/li>\n\n\n\n<li>Design issues<\/li>\n\n\n\n<li>Poor solder joints or components<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>9. Moisture Sensitivity (MSL Issues)<\/strong><\/h2>\n\n\n\n<p>Critical for IC packages.<\/p>\n\n\n\n<p><strong>Defects:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Popcorn effect during reflow<\/li>\n\n\n\n<li>Internal cracking of ICs<\/li>\n<\/ul>\n\n\n\n<p><strong>Root causes:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Improper storage (humidity exposure)<\/li>\n\n\n\n<li>Not following bake-out procedures<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>10. Design-Related Issues (DFM \/ DFT Gaps)<\/strong><\/h2>\n\n\n\n<p>Sometimes the process is fine\u2014but design causes scrap.<\/p>\n\n\n\n<p><strong>Examples:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Poor pad design<\/li>\n\n\n\n<li>Inadequate spacing \u2192 solder bridging<\/li>\n\n\n\n<li>Difficult test access<\/li>\n\n\n\n<li>Thermal imbalance<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Scrap and NG (Non-Good) in a PCB\/PCBA factory don\u2019t come from one single issue\u2014they\u2019re usually a combination of design gaps, process variation, material defects, and handling problems. 1. Soldering Defects (Top Contributor) This is usually the #1 scrap driver in SMT lines. Common issues: Root causes: 2. Component Placement Defects Errors during pick-and-place process. Typical [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":2916,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[15],"tags":[54,284,283,48,285,79,83],"class_list":["post-2915","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-boi-scrap","tag-boi-inspection","tag-component-placement-defects","tag-pcb-fabrication-defects","tag-scrap-2","tag-soldering-defects","tag-technical-and-performance-validation","tag-third-party-inspection-service"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Major Scrap \/ NG Sources in PCB (PCBA\/SMT) Factories - Advantage<\/title>\n<meta name=\"description\" content=\"Most scrap in PCB factories is process-driven, not random. 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