this post was submitted on 11 Feb 2024
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The initial debugging you did, how did you root cause to the PSU? Your debugging aside I would check the fuse and MOV first. Did you have any bad weather recently? Lightning will take out your fuse and MOV and they're an easy fix. Google what a Metal Oxide Varistor looks like. Next I would check for any damaged or blackened parts, then check the capacitors for bulging and capacitence values. Anything after that will get heavy on the EE side of things.
I am guessing the MOV is the component marked MOV on the board, its markings are: TVR 07471. Can I test this "in-circuit, or must I de-solder it to test it?
In-Circuit I measure around 470kohm