Quote:
Originally Posted by Rodeo
2 of my boards was in bad shape but repairable. Leakes makes them weak thats a reason for pad loss etc that happens when unexperienced people repairs ??
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Hi Rodeo,
The leaks don't usually make the pads weak although I have seen this after a very long period of exposure. When working on a PCB, pads will normally de-laminate from the application of excessive heat. Inexperienced repairers often apply excessive heat or leave the iron on the pad for too long because they are having difficulty removing the part. I have seen many "re-cap" attempts that resulted in lifted pads. It is very easy to cause this type of damage.
It is possible to repair de-laminated pads and tracks, I have done this after receiving boards with lifted and missing pads (due to bad repair attempts). It is quite a bit more work though.
The epoxy between copper pad and FR4 laminate can sometimes only tolerate a limited amount of heating cycles and can also become weaker from excessive heating/re-work cycles.