i dont know the circuit well enough to test for it.
the output voltages on the smps are less than half of normal.
and even the voltage on the diode side of the optocoupler is low.


Ken wrote:
BigTom wrote:

ive checked esr on all the caps and theyre ok.
ive got a another working monitor to test voltages/resistances etc.
ive read the sci.electronics.repair.of.smps.
are there any other good web sites where i can learn more about smps.


Jerry G. wrote:

This is not something that can be done over an email. It is the skill
and
experience of using the proper tools and knowledge to be able to trace
through the operation of the supply, and to be able to check and or
try out
the various suspect components.

Many times in these supplies the electrolytic caps give problems. You
can
use an ESR meter to test them.



Did you check for an over current condition causing the PS to shut
down?