Mark Rages wrote: > > I've had moderate success clearing blind shorts with the 5V bus of a > high-power computer power supply. (This can be hazardous to other > parts on an assembled board) Otherwise, use a current-limited power > supply to put a few amps into the stuck node. Use a millivolt meter > to measure different places on it. Lower voltage means closer to the > short.
An IR camera to look for the hotspot would probably be a handy way to do this too. Who's got an IR camera though? FWIW, strange shorts can happen on high-end board mfg. lines too. I recently had a fairly large board used in my day job start smoking after several hours of use. Tracked it down to a power via that internally shorted to a ground layer. Destroyed the via, carbonized the board and de-laminated the top layer in the vicinity, but after I drilled it out, removed debris and sealed with solder-mask touchup the board is usable again (one-off prototype with several hundred dollars worth of fast ADCs, so we preferred not to junk it). Eric _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
