Category Archives: Quality


Dec05
Both solder joint bridging and open solder joint happen at same BGA?

發表於 December 5, 2018

Is that possible both solder joint bridging and open solder joint defect happen at same BGA (Ball Grid Array) or CSP (Chip Scale Package) device? It is hard to see both solder joint bridging and open solder joint defect happen … Continue reading →

Process, Quality, Soldering     WorkingBear    Views (1,497)     comment (0)
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Jun19
Increase solder paste volume will improve the MLCC capacitor broken?

發表於 June 19, 2017

Recently WorkingBear got complaint from R&D and ask increase the solder paste volume on the MLCC (Multi-Layer Ceramic Capacitor)  component pads to improve the capacitor broken issue. R&D said he had verified that the capacitor’s footprint in the board design … Continue reading →

Design, Manufacture, PCB, Quality, Reliability, SMT, Soldering     WorkingBear    Views (2,810)     comment (0)
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May03
Trouble Shooting Guide for Plastic Injection

發表於 May 3, 2016

Trouble Suggested Remedies (Solutions) DIMENSIONAL PROBLEMS   Shot-to-shot dimensional variations Increase injection pressure Maintain uniform pad (cushion) Repair leaking back flow value if pad cannot be maintained Increase screw forward time Maintain uniform cycle Eliminate un-melted particles (see below) Use … Continue reading →

Plastic, Quality     WorkingBear    Views (2,023)     comment (0)

Jun24
Case study for the mold-in insert screw boss broken

發表於 June 24, 2015

Last time WorkingBear mentioned the potential root causes to bring the screw boss crack after mold-in screw nut insert. Actually we received the complaint from the field then asked EMS and plastic supplier to double check their inventory and found … Continue reading →

Design, Plastic, Quality     WorkingBear    Views (5,037)     comment (0)
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Jun10
PCB rework: Selective solder mask removal by laser

發表於 June 10, 2015

Did you ever met a trouble need to rework to remove the solder mask from the PCB?  If yes then how you did? We usually remove the solder mask manually  by knife or hand grinding tool. But these kinds of … Continue reading →

Manufacture, Quality     WorkingBear    Views (4,996)     comment (0)