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.

--

Jerry G.
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"BigTom" wrote in message ...
how can i fix a ticking smps on a mitac L1450PD
it uses a UC3842 controller CNX82A optocoupler and TL431A shunt.
there are four lines on this monitor, 150v 87v 24v 6.3v all reading low.
how do i find the line causing the problem?