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An Image Library of SMT Defects Section 2: BGA PCB Defects, External Damage
June 1, 2010 |Estimated reading time: 1 minute
-- Images in this section include mechanical damage from improper handling, test probes, and other sources. Some mechanical intrusions can lead to electrical failure or degrade reliability.
These images of SMT defects and attributes were compiled by consultant Tom Clifford. The complete Section 2 image library appears below. Other Sections will be published later on www.SMTonline.com. They provide resources for training, quality control specs and standards, and research. Descriptions, provided below each image, do not necessarily define causality or severity, but serve as identification.
Figure 1. Mechanical damage, unknown. Likely to pass electrical test, but probably have poor reliability. Figure 2. Damage by probe or other mechanical intrusion. Check for exposed copper. Figure 3. Test probe damage. Figure 4. Reworked splash bridge. Check for splash in other locations. Figure 5. Unknown defect: mechanical damage or process contamination Check adjacent pads. Figure 6. Serious damage. Expect electrical failure. Figure 7. Linear gouge. Check mechanical handling system. Figure 8. Scuffed. Unknown mechanical damage source.
Visit the Other Sections:Section 1. BGA PCB Defects, External Damage
Section 3. BGA PCB Defects, Via-in-pad
(Upcoming)Section 4. BGA PCB Defects, Clearance, Dims Section 5. BGA PCB Defects, MaskSection 6. BGA PCB Defects, Metallic ContaminationSection 7. BGA PCB Defects, Non-metallic Contamination, FOD Section 8. BGA PWB-related Assy DefectsSection 9. BGA Assy X-sectionsSection 10. BGAs Re-balled Section 11. SMT Assy DefectsSection 12. SMT Assy, T-cycled CracksSection 13. SMT PWB Pads Section 14. PWB Vias, X-sections
Do you have images of solder-joint or other interconnect features or defects that you want to share? Send them to SMT editor Holly Collins at editorial@iconnect007.com. You must obtain permission to publish the photos and may not show proprietary or company-specific information on the images. We are particularly interested in images of advanced SMT assembly technologies and failure analyses.
Post your electronics manufacturing, SMT-related material to the #SMT community on Twitter. Use the #SMT hashtag.