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Asus VL279 (VL279HE) - possible short?

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    #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
    "We have offered them (the Arabs) a sensible way for so many years. But no, they wanted to fight. Fine! We gave them technology, the latest, the kind even Vietnam didn't have. They had double superiority in tanks and aircraft, triple in artillery, and in air defense and anti-tank weapons they had absolute supremacy. And what? Once again they were beaten. Once again they scrammed [sic]. Once again they screamed for us to come save them. Sadat woke me up in the middle of the night twice over the phone, 'Save me!' He demanded to send Soviet troops, and immediately! No! We are not going to fight for them."

    -Leonid Brezhnev (On the Yom Kippur War)
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    #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

      #3
      Re: Asus VL279 (VL279HE) - possible short?

      Originally posted by lotas View Post
      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
      "We have offered them (the Arabs) a sensible way for so many years. But no, they wanted to fight. Fine! We gave them technology, the latest, the kind even Vietnam didn't have. They had double superiority in tanks and aircraft, triple in artillery, and in air defense and anti-tank weapons they had absolute supremacy. And what? Once again they were beaten. Once again they scrammed [sic]. Once again they screamed for us to come save them. Sadat woke me up in the middle of the night twice over the phone, 'Save me!' He demanded to send Soviet troops, and immediately! No! We are not going to fight for them."

      -Leonid Brezhnev (On the Yom Kippur War)

      Comment

        #4
        Re: Asus VL279 (VL279HE) - possible short?

        Not really useful but just in case it helps
        Attached Files

        Comment

          #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.

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