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Category Archives: Process
Jul08
BGA Cross-Section Analysis: How to Evaluate Solder Joint Quality and Identify Common Defects
Figcaption：BGA Cross-Section Analysis: How to Evaluate Solder Joint Quality and Identify Common Defects This article is intended for anyone who isn’t yet familiar with how to evaluate the quality of BGA solder joints from cross-section images. Workingbear happens to have … Continue reading
May13
MRB Decision-Making and Cosmetic Quality Evaluation for Plastic Parts
When Workingbear first joined an electronics final assembly factory as a product/process engineer, I often had to attend MRB (Material Review Board) meetings. From time to time, people would come to me asking me to evaluate rejected parts and decide … Continue reading
Apr27
Using Limit Golden Samples to Manage Non-Quantifiable Quality Standards
In business transactions, both buyers and sellers usually agree on a product specification and acceptance criteria for the items being purchased. These criteria may include things like full functionality, dimensions within tolerance, intact packaging, and no defects in color or … Continue reading
Apr22
How to Define Cosmetic Quality Standards for Plastic Parts
Caption: Cosmetic scratches on plastic parts Before products are put into inventory after final assembly, electronics manufacturing factories always perform quality inspections to ensure product quality. In terms of functional performance, most products go through 100% function testing, so pass/fail … Continue reading
Apr02
Root Cause Analysis: Why FPC Traces Break
Recently, my company started seeing an increase in field returns caused by open circuits in flexible printed circuits (FPCs) inside the terminal. After digging into several cases, the root cause turned out to be broken copper traces. So what’s going … Continue reading
