MSI MS-16H51 Short to Ground

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  • mgrharry
    Badcaps Veteran
    • Sep 2016
    • 211
    • usa
    #1

    MSI MS-16H51 Short to Ground

    Working on an MSI laptop motherboard, model MS-16H51. System has a short to ground, injected 19v 2a to DC in and identified the culprit as an AO4447A mosfet, short goes away when removed. See pic below. Combing through my donor boards I haven't been able to locate an exact match for AO4447A. I tried AO4423 but short returns when it is attached.

    Original AO4447A
    http://aosmd.com/pdfs/datasheet/AO4447A.pdf
    AO4423
    http://aosmd.com/pdfs/datasheet/AO4423.pdf

    Maybe another component is defective?

    Thanks
    Attached Files
    Last edited by mgrharry; 10-24-2019, 01:43 PM.
    Tags: None
    • piernov
      Super Moderator
      • Jan 2016
      • 4435
      • France
      #2
      Re: MSI MS-16H51 Short to Ground

      Short to ground after DC-in MOSFETs.
      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

        Comment

        • mgrharry
          Badcaps Veteran
          • Sep 2016
          • 211
          • usa
          #3
          Re: MSI MS-16H51 Short to Ground

          OK, injected power after DC mosfet... only thing that warms up is the CPU. Fuckkkkk.

            Comment

            • mcplslg123
              Badcaps Legend
              • Jun 2015
              • 7262
              • india
              #4
              Re: MSI MS-16H51 Short to Ground

              This mb has inbuilt cpu and it was wrong to inject 19v on rail. perhaps you had short in vcore rail and you just killed the cpu by applying 19v as it reached the cpu. maynot be the case here but there is high probability of such a scenario. Always start with 1V andincrease the amp instead of voltage.

                Comment

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