Asus VL279 (VL279HE) - possible short?

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  • mockingbird
    Badcaps Legend
    • Dec 2008
    • 5484
    • -
    #1

    Asus VL279 (VL279HE) - possible short?

    I have an Asus VL279HE, PCB model is 4H.42101.A21



    The symptom is that there's no power at all with it with the AC adapter hooked up. The fuse tests ok, but when the AC power adapter is connected, I do not get a voltage reading with my DMM from the pins on the back. The connector itself tests ok, which leads me to conclude that there's some short on the board which is triggering protection in the AC adapter and causing the voltage to go to 0.

    I am not certain where to start looking beyond the fuse though.

    Thanks
    Attached Files
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    • lotas
      Badcaps Legend
      • Jan 2016
      • 4534
      • Russia
      #2
      Re: Asus VL279 (VL279HE) - possible short?

      Rather, the problem is in the power supply itself (electrolytic capacitors) does not hold the load and the power drops from it.

        Comment

        • mockingbird
          Badcaps Legend
          • Dec 2008
          • 5484
          • -
          #3
          Re: Asus VL279 (VL279HE) - possible short?

          Originally posted by lotas
          Rather, the problem is in the power supply itself (electrolytic capacitors) does not hold the load and the power drops from it.
          No, that can't be it, I tried 3 different known good adapters. I'll try replacing the NIKOS PA410BD TO252 MOSFET.
          Attached Files

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            • Lisa Su
              Badcaps
              • Apr 2021
              • 213
              • Taiwan
              #4
              Re: Asus VL279 (VL279HE) - possible short?

              Not really useful but just in case it helps
              Attached Files

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                • CapLeaker
                  Leaking Member
                  • Dec 2014
                  • 8070
                  • Canada
                  #5
                  Re: Asus VL279 (VL279HE) - possible short?

                  Could be a bad DC jack too. Measure for a short at that DC jack, or from the fuse to ground.

                    Comment

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