Repair circuit board.

Saturday morning nothing much to do. Today i show you that a weak soldering can make electronic equipment failed to working.

This is an example circuit board yesterday i took from EM Lock.

When i begin to inspect. I found a weak soldering underneath the pcb for the supply connector.

 A rounded soldering is not good. Cause by not enough heated. Less flux or not using good quality soldering lead.

You can save money by doing a rework on the pcb.

Remove the connector from pcb. Cleaned the pcb with sand paper or brush and placed it back together with new solder lead.

Thats all. You may keep it for use it as a spare part in the future.