sys electronics LCD monitor power cycling

[unix-freak]

Hi all,

All electrolytics have tested good with ESR and capacitance value
testers. There is no chopper transistor. There is a 1m0565R and I'm
not having much luck finding any info on it. It has 4 leads, ground,
vcc, 1 lead to the opto-isolator and lastly one to the coil's primary.
I'm guessing that this is the oscillator and is PW modulated by the
optoisolator.

The secondary has a TL431 shunt regulator that has bench tested good.
I haven't hooked up a variac yet.
All diodes have tested good too.

Any ideas?
BTW - I have 3 of these monitors that have the same problem. I can
power the monitor fine if I bypass the power supply and use my 12V
bench supply. The PS only outputs 12V.

 

[unix-freak]

[email protected] (unix-freak) wrote in message
For those of you just on the edge of your seats to know whatever
happened to this monitor. It's repaired.

It was a 12V zener that otherwise checked good with the diode checker.
When pulling it out and popping it in a test circuit, the breakdown
voltage was all over the place.

I repaired 3 like this and one was given to me for the cost of the 3
diodes. Can't beat that for a 17" LCD monitor.