Quote:
Originally Posted by Benyamin39
There is a power regulator (IC601), would that be what I am looking for?
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That isn't really a power regulator IC despite what the schematic says. That is a precision voltage reference feedback IC that feeds the opto coupler.
The first thing to check is capacitor C609 in the primary circuit. Also, get a magnifying glass and bright light and look for any circular solder cracks on the transformer pins.
John