I repair them (except the complettely fried ones).
Most ATX suffer in the +5Vsb power generation.
The +5Vsb is a complete small SMPS. Very offen it brokes (high ESR cap) and
it you have not a 7805 inside the PSU, you'll get probably a fried
motherboard,keyboard and some times PCI cards!.

The working period is not very long because of excessive heat produced by
the stand by work.
When power is off for at least 30 minutes, and caps gets cold... Then when
power is back on the +5Vsb will become up to +40Vsb (except the presense of
7805).

Even expensive brand models suffer from this issue.

to stabilize it after the +5Vsb SMPS
"Bart³omiej Zarzycki" wrote in message
...
How or where I can find some documents for repair atx power suppliers ?

I planning to buy power supplier which I have repair documents and save
money and natural environment in future.

I already have CODEGEN 300x1 300W (broken)