Thread: ticking smps
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Jim Yanik
 
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BigTom wrote in :

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?


ticking indicates the PS is trying to start,but tripping a protective
current limit.

I'd check for shorted diodes on the secondaries and use an ESR meter to
check the electrolytics.

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Jim Yanik
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