Tweakers' Asylum

RE: Zerozone PSU with wrong transformer?

32.210.164.98

In Reply to: RE: Zerozone PSU with wrong transformer? posted by tattenbach on December 04, 2019 at 10:43:21

What's the black ooze above the cap labeled D2?

The printed circuit board trace mask there looks discolored, as if it was overheated - too much current.

First thing I'd check is whether one or more of the rectifier diodes is shorted. Also, check the filter cap.

It could be bad parts. Or, perhaps you had a voltage surge on the AC mains input. Or, a design bug.

Follow Ups:

RE: Zerozone PSU with wrong transformer? - Uncle Mike 13:19:19 12/05/19 (0)
Or a cold solder point that created resistance which = heat, It is right on the trace.
It sucks to get old. It really sucks to get old and bitter.

Edits: 12/05/19
RE: Zerozone PSU with wrong transformer? - Sondek 06:04:09 12/05/19 (0)
Good eye. I had to increase magnification to 200% to see it, but you're right. It's burnt.

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