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Old 03-01-2021, 08:19 PM   #16
momaka
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Default Re: 1300W PSU - Help with replacement mosfet

Check the primary input electrolytic caps too. Usually blown APFC components is a result of the primary caps going either short-circuit or open-circuit / low capacitance. Not uncommon for these to go bad either. You will need an ESR + capacitance meter to test them, though (i.e. can't do it with just a regular multimeter.) The cheap GM328 component testers online will do this... or just spend the $8-12 on new input (and quality Japanese 105C too) caps, whichever you prefer. If buying new, make sure the caps are rated for at least 420V... or better yet 450V. APFC does not last long with 400V caps from what I've been seeing so far.
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