Author Archives: WorkingBear


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

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

Nov14
How to print solder paste on PC Board and screen printing notices?

Printing the solder paste on the PCB (Printed Circuit Board) and go through reflow oven to re-melt the solder paste and solder the electronic components on PCB is most common process in today’s electronics manufacturing industry. Printing the solder paste … Continue reading

Jun19
Increase solder paste volume will improve the MLCC capacitor broken?

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

Jan05
Comparison between shielding-can directly mount and shielding-clip/frame

Recently one of my top manager ask to mount the shielding-can or call shielding-cover directly on the Printed Circuit Board to instead of mount the shielding-clip or call shielding-frame on the board first then cover the shieling-can. He said this … Continue reading

May03
Trouble Shooting Guide for Plastic Injection

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