I have checked all Electrolytics and they showed to be good. One on the good
PSU showed .75 esr and the same one on the bad PSU showed 1.00 (47 mfd @
35v(*)).
I may replace it anyway.


I have compared the values between power supplies and they are the same
(using the diode and ohms scale).
I thought for sure I could find a difference somewhere but I haven't yet.

I have replaced many components and the unit did work. After about 30 mins
it would
start turning off and then back on. Now it will not show a picture and the
screen stays off, except for the led on the front.
I did find a transistor (c3198 replaced with c1815) that was shorted and
replaced it.
This transistor was in one of the feedback circuits. At first I thought it
was a bad cap(*see above), because the esr meter showed
low DSR. but it was a shorted transistor.

The wierd thing is all voltages check correct and do not change with the PSU
power cycles (when the green led on the front goes off and then back on).

I will check the voltages on the good PSU and see what it does.

This PSU has 5v, s5v, 12v, 18v, 24v (marked as 24v, DVM shows 20v), 33v
outputs.
Also it has a pwr connection. PWR (2.93v) (I guess the logic board tells the
PSU to power on with this one.)
I was thinking one of these outputs would fluctuate when the led on the
front goes out and then back on, but I was wrong.

The PSU was hit by a power surge. The surge took out the bridge rect. and
the controller IC and Power Transistor (Primary). It also took out two of
the big schottky diodes (secondary side).
All were replaced.

I can't get a schematic on this as far as I know. A schematic would be
great!


TIA!