Power supply broke

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  • momaka
    master hoarder
    • May 2008
    • 12170
    • Bulgaria
    #21
    Re: Power supply broke

    Originally posted by prfcom
    Although I do have a limited supply of caps, I think I've probably wasted enough of my life on this P.O.S. which will probably end up in the garbage where it should have gone when it failed without any prior abnormalities
    This PSU doesn't look all that bad inside. I'd keep it for spare parts.
    ----
    Well, reading the post above, I guess you're done troubleshooting this power supply. But if you change your mind, I guess there's a few more things to try.
    ...
    Have you checked the power resistors on the primary side? By power resistors, I mean the big, low-ohm ones. Make sure one of them hasn't become opened.
    Also, if you hook up a multimeter to either 3.3/5/or 12v rail and you try to turn on the PSU, do they pulse for a second or no? If not then perhaps the controller on the primary side isn't getting a signal to turn on the FETs.
    I believe M2 and M8 are responsible for feedback from secondary side to primary side. Maybe a components somewhere in that circuit got open.

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