Macbook A2179 820-01958 No Power

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  • Instafixx
    Badcaps Veteran
    • Jul 2022
    • 374
    • India
    #1

    Macbook A2179 820-01958 No Power

    Hello,
    Namaste.

    We have a Macbook A2179 820-01958 with no power issue. The board is drawing 20V.

    All Power Rails look normal.

    However is have P5VG3S_EN is at 1.8V.
    Upon further checking i found PPVDDCPU_AWAKE stuck at 0.8V instead of the Normal 1.06V.

    Resistance to ground is fairly low around 8 Ohms.

    Is it a bad T2 Chip? The device is not in DFU mode.
    Tags: None
    • Instafixx
      Badcaps Veteran
      • Jul 2022
      • 374
      • India
      #2
      Re: Macbook A2179 820-01958 No Power

      Originally posted by Instafixx
      Hello,
      Namaste.

      We have a Macbook A2179 820-01958 with no power issue. The board is drawing 20V.

      All Power Rails look normal.

      However is have P5VG3S_EN is at 1.8V.
      Upon further checking i found PPVDDCPU_AWAKE stuck at 0.8V instead of the Normal 1.06V.

      Resistance to ground is fairly low around 8 Ohms.

      Is it a bad T2 Chip? The device is not in DFU mode.

      Just in case anyone drops in looking for a solution.

      Tried DFU Revive. Didnt Work.
      Tried Reballing the U7800. Didnt Work.

      Ordered a New U7800. Installed it. Did a DFU revive and Voila the laptop is back on.

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