Category Archives: PCB/FPC/PTF


Sep30
What Is HASL Surface Finish? Advantages and Disadvantages

post on September 30, 2026

Figcaption: What Is HASL Surface Finish? Advantages and Disadvantages HASL stands for Hot Air Solder Leveling and is one of the most common PCB surface finishes. It is commonly referred to simply as HASL or a solder coating. During the … Continue reading →

PCB/FPC/PTF, Soldering, Uncategorized     WorkingBear    Views (75)     comment (0)
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Sep16
Component Drop-Off on PCBs: How to Analyze, Troubleshoot, and Identify the Root Cause

post on September 16, 2026

Figcaption: Component Drop-Off on PCBs: How to Analyze, Troubleshoot, and Identify the Root Cause Components falling off a PCB can be a nightmare for many process and quality engineers. Workingbear has previously shared several cases involving components falling off PCBs. … Continue reading →

Design, EDX/EDS/SEM/IMC/FTIR, PCB/FPC/PTF, Process, Quality, Reliability, Soldering     WorkingBear    Views (339)     comment (0)
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Apr15
Common Ways to Connect FPC to PCB: What Actually Works

post on April 15, 2026

As electronics keep getting smaller and more advanced, the need to connect flexible printed circuits (FPCs) to rigid PCBs continues to grow. In this article, Workingbear will walk you through the most common methods used in the industry today—and share some … Continue reading →

Design, PCB/FPC/PTF, Soldering     WorkingBear    Views (1,923)     comment (0)

Apr08
How I Troubleshoot Hidden Open Circuits in FPCs

post on April 8, 2026

Flexible printed circuits (FPCs) are widely used because they can bend and fold. They’re perfect for compact products or for connecting signals between different PCBAs. But there’s a downside. As usage increases—especially in applications with repeated motion—FPCs can develop open circuits or … Continue reading →

PCB/FPC/PTF, Quality, Uncategorized     WorkingBear    Views (952)     comment (0)

Apr02
Root Cause Analysis: Why FPC Traces Break

post on April 2, 2026

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 →

Case study, PCB/FPC/PTF, Process, Quality, Reliability     WorkingBear    Views (1,482)     comment (0)