Category Archives: PCB/FPC/PTF


Sep30
How PCB S/M and Silkscreen Thickness Can Mess with Solder Paste Volume and Even Cause BGA Shorts!

post on September 30, 2025

Over the past few days, Workingbear came across an issue I hadn’t really considered before. Here’s the story: an EMS (electronics manufacturing service) factory reported that during PCBA production, they were seeing solder shorts under BGA components. After digging into … Continue reading →

PCB/FPC/PTF, Quality, SMT, Soldering     WorkingBear    Views (68)     comment (0)
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May29
Uncovering the Culprit: How CAF Turned Out to Be the Hidden Cause Behind PCB Micro-Shorts — From Suspicion and Analysis to Solutions

post on May 29, 2025

Workingbear’s company was having a tough time with a strange issue: intermittent micro-short circuits inside the layers of the PCB. Since the shorts didn’t show up near any components, it was really hard to figure out what was wrong. Recently, … Continue reading →

Case study, EDX/EDS/SEM/IMC/FTIR, PCB/FPC/PTF, Process, Quality, Reliability     WorkingBear    Views (1,742)     comment (0)
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May22
What is CAF (Conductive Anodic Filament) in PCBs? and How to Prevent It

post on May 22, 2025

One of our company’s products once experienced an issue called an “internal micro-short” in the printed circuit board (PCB). After investigation, we discovered the root cause was something called CAF (Conductive Anodic Filament). But let’s be honest—if you translate that … Continue reading →

PCB/FPC/PTF, Quality, Reliability, SMT, Soldering     WorkingBear    Views (1,868)     comment (0)
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May08
The Deep Dive: BGA Pads: SMD vs. NSMD (Strength, Voids & Design Considerations)

post on May 8, 2025

Hey folks, welcome back to the blog! Today, we’re diving deep into something absolutely critical for the reliability of almost every electronic gadget out there: BGA solder joints. You know, those tiny connections that hold complex chips onto our printed … Continue reading →

Design, PCB/FPC/PTF, Process, Quality, Reliability, SMT     WorkingBear    Views (2,291)     comments (1)
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Apr10
What is PCB (Printed Circuit Board)? What Are Rigid, Flexible, and Rigid-Flex PCBs?

post on April 10, 2025

In the electronic devices we use daily—such as remote controls, smartphones, refrigerators, TVs, air conditioners, and computers—there is a crucial component called the Printed Circuit Board (PCB). The name comes from the way its electrical circuits are formed, similar to … Continue reading →

PCB/FPC/PTF, Product Introduction     WorkingBear    Views (1,486)     comment (0)