maxipower 400W Dead power supply repair

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  • khalillll
    Member
    • Sep 2025
    • 27
    • &00
    #1

    maxipower 400W Dead power supply repair



    The power supply was completely dead. Voltage reached the main capacitors, but nothing after that.
    After checking, I replaced the UTC7606D IC to restore the 5VSB.
    I using SDC606U as a replacement, but it didn’t work — possibly the IC itself was faulty.
    Replaced it again with another UTC7606D.
    Result: 5VSB came back, but still nothing — no 12V, 5V, or 3.3V.
    After checking again, I think the issue was with the UTC7520D IC.
    Replaced it with a WT7520.
    Result: PSU fully working again
    Attached Files

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    Last edited by SMDFlea; 09-27-2025, 05:50 AM. Reason: maxipower 400W
    Tags: None
    • CapLeaker
      Leaking Member
      • Dec 2014
      • 8351
      • Canada
      #2
      After the second round replacing the supervisor IC, the PSU should have come on for a split second (fan twitch). What brand and model PSU is this?

        Comment

        • khalillll
          Member
          • Sep 2025
          • 27
          • &00
          #3


          Yes, after replacing the UTC7520D with a WT7520, the power supply is working again and all voltages are present: 12V / 5V / 3.3V

          it is maxipower 400W .

            Comment

            • CapLeaker
              Leaking Member
              • Dec 2014
              • 8351
              • Canada
              #4
              Should have read before replacing the supervisor IC. My bad.

                Comment

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