Help Fixing a Sanguinololu After Mistake July 11, 2013 05:53PM |
Registered: 10 years ago Posts: 9 |
Re: Help Fixing a Sanguinololu After Mistake July 11, 2013 06:07PM |
Registered: 10 years ago Posts: 9 |
Re: Help Fixing a Sanguinololu After Mistake July 11, 2013 06:55PM |
Registered: 10 years ago Posts: 9 |
Re: Help Fixing a Sanguinololu After Mistake July 12, 2013 03:41AM |
Registered: 10 years ago Posts: 9 |
Quote
R.G. Says:
PCB cancer.
No, not being funny. When a PCB starts arcing, it carbonizes a path under the arc. The carbon traces are conductive, so they keep conducting. If there is enough current available, it keeps charring and eating more PCB.
Whatever started it - perhaps a microscopic thread of copper left on the board, is probably gone by now. Could have been a defect in the original PCB material.
To stop this you have to interrupt the current path by cutting or scraping away any trace of charring to restore it to an open circuit.
I first ran into this when working on a 200A 5V power supply. Only there, the current had charred away about 2 square inches of PCB area.
Re: Help Fixing a Sanguinololu After Mistake July 15, 2013 09:52AM |
Registered: 10 years ago Posts: 180 |