HP Desktop 8000 psu diode problem

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  • NConstantinou
    Badcaps Veteran
    • May 2017
    • 334
    • Cyprus
    #1

    HP Desktop 8000 psu diode problem

    Dear all

    I was testing the above power supply and I found a diode T2D 01 which is shown dead.
    I checked in Google to find this part but I couldn't.
    I believe is schottky diode.

    Can someone help!
    Can i substitute with something else

    Thanks
    Tags: None
    • NConstantinou
      Badcaps Veteran
      • May 2017
      • 334
      • Cyprus
      #2
      Re: HP Desktop 8000 psu diode problem

      Maybe is not a schottky.
      on board the symbol is shown as standard diode connnected on pin 4 of TNY278PN
      HELP!!!

        Comment

        • sam_sam_sam
          Badcaps Legend
          • Jul 2011
          • 6039
          • USA
          #3
          Re: HP Desktop 8000 psu diode problem

          Can you post some pictures of this power supply

            Comment

            • CapLeaker
              Leaking Member
              • Dec 2014
              • 8146
              • Canada
              #4
              Re: HP Desktop 8000 psu diode problem

              Diodes don’t go dead if they are still in one piece. So I say that diode is o.k, because it isn’t shorted and it is a TVS diode. So keep looking... that diode isn’t your problem. Certain TVS diodes measure “open”.
              Last edited by CapLeaker; 04-18-2020, 07:19 PM.

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA
                  #5
                  Re: HP Desktop 8000 psu diode problem

                  It is snubber diode (Zener and diode connected in series with Cathode to Cathode), it will read as open circuit. See similar internal connection in the spec. sheet attached. You will need high Voltage power supply to test it.
                  Show us good clear pictures of your board.
                  Attached Files
                  Never stop learning
                  Basic LCD TV and Monitor troubleshooting guides.
                  http://www.badcaps.net/forum/showthr...956#post305956

                  Voltage Regulator (LDO) testing:
                  http://www.badcaps.net/forum/showthr...999#post300999

                  Inverter testing using old CFL:
                  http://www.badcaps.net/forum/showthr...er+testing+cfl

                  Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                  http://s807.photobucket.com/user/budm/library/

                  TV Factory reset codes listing:
                  http://www.badcaps.net/forum/showthread.php?t=24809

                    Comment

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