Seasonic Platinum 860W No Fan Spin

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  • CallumUK
    New Member
    • May 2023
    • 3
    • United Kingdom

    #1

    Seasonic Platinum 860W No Fan Spin

    Hello
    I am a novice here but electronics enthusiast and general all round tinker.

    I have a Seasonic Platinum Series 860W PSU which does not turn on my PC. I get no fan spin and I have used the jump start method with the PSU out of the case and it doesn't turn on either. I believe this PSU doesn't need a load to begin working.

    I didn't see any bulging caps, burnt areas or burnt smell from the PSU.

    This is the same PSU as in this review: https://www.anandtech.com/show/5464/...-series-860w/4

    I have gone as much as using a screwdriver to discharge the capacitors (The 2 big brown ones) and then check the continuity on the fuse which shows as working (basically I get a bleep)

    I have access to a Kaiweets HT118A multimeter and a Pinecil soldering iron but how would I go about diagnosing the issue and what should my next steps be please?
    Attached Files
  • CallumUK
    New Member
    • May 2023
    • 3
    • United Kingdom

    #2
    Re: Seasonic Platinum 860W No Fan Spin

    I probed +5VSB Purple cable with the PSU switched ON it reads 5.109V

    Additionally the Green PS_ON# wire with the PSU switched ON or OFF reads 3.230V

    No other wires are giving an voltage readings.
    HTH

    Comment

    • stj
      Great Sage 齊天大聖
      • Dec 2009
      • 31065
      • Albion

      #3
      Re: Seasonic Platinum 860W No Fan Spin

      well thats good, standby is running.
      the 3,2v is from a pullup resistor - connect PS_ON to ground and it should start up the main section.

      Comment

      • redwire
        Badcaps Legend
        • Dec 2010
        • 3910
        • Canada

        #4
        Re: Seasonic Platinum 860W No Fan Spin

        Cross-posted https://www.eevblog.com/forum/beginn...s-not-turn-on/

        Too bad that guy didn't finish his schematic of the little side board. It's in Photoshop and I couldn't open it in Gimp. Or know the IC markings.
        Attached Files

        Comment

        • mrcliem
          Member
          • Mar 2020
          • 25
          • Indonesia

          #5
          Re: Seasonic Platinum 860W No Fan Spin

          I believe, its the same just different pcb color
          Attached Files

          Comment

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