On 03/23/2012 09:30 PM, J. Forster wrote:
I should have added that you can get a pretty good idea of whick branch on
a PCB is drawing current by probing along the trace. This is especially
useful if the rail has a bunch of branch distribution lines.
Also, if the three-terminal regulator is overheating, disconnect it and
power just that rail from an external, current limited supply of a volt or
two. That way you don't risk trace damage.
I would toss the TDR on it just for the fun of it, but a miliohm
measurement should also help to locate it. Otherwise if there is no
direct evidence (hot cap or other chip) lifting legs of caps on
speculation can be a starter.
Cheers,
Magnus
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