A1990 MacBook no power help

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  • Cameron Kajohn
    New Member
    • Aug 2022
    • 3
    • United Stated
    #1

    A1990 MacBook no power help

    I have a a1990 2018 15 inch MacBook Pro that will not power on.
    I have replaced the pch bga chip because it was heating up under my thermal camera.
    I have replaced the battery, and replaced the small ic between the gpu and cpu as it had a direct short to ground.

    the MacBook now pulls 20v 2.4amps the trackpad clicks but it does not ever attempt to power on not even fan spin. After PCH replacement I was able to get it in dfu mode 1 time and restore bridge OS, but now the MacBook will no longer go into DFU mode.

    I have also noticed L7030 gets extremely hot yet there is no short to ground and it has 465ohms on both sides. I have also noticed that pp2v5 rail is missing and is showing 65 ohms on the rail. Not sure where to go from here if anyone has any suggestions.
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 14191
      • Canada
      #2
      20v 2.4amps
      Is this an immediate current consumption of 2.4A? Or does the current gradually climb up to this value? If it is an immediate current measurement of 2.4A then you have a short on the board.

        Comment

        • Cameron Kajohn
          New Member
          • Aug 2022
          • 3
          • United Stated
          #3
          It gradually climbs up, starting at .645 amps and then rising to 2.4.

            Comment

            • Cameron Kajohn
              New Member
              • Aug 2022
              • 3
              • United Stated
              #4
              Bump

                Comment

                • mon2
                  Badcaps Legend
                  • Dec 2019
                  • 14191
                  • Canada
                  #5
                  What is the voltage to ground of ppbus_g3h?

                  is the board power looping?

                    Comment

                    • leovalpo
                      Member
                      • May 2014
                      • 12
                      • chile
                      #6
                      Originally posted by Cameron Kajohn
                      I have a a1990 2018 15 inch MacBook Pro that will not power on.
                      I have replaced the pch bga chip because it was heating up under my thermal camera.
                      I have replaced the battery, and replaced the small ic between the gpu and cpu as it had a direct short to ground.

                      the MacBook now pulls 20v 2.4amps the trackpad clicks but it does not ever attempt to power on not even fan spin. After PCH replacement I was able to get it in dfu mode 1 time and restore bridge OS, but now the MacBook will no longer go into DFU mode.

                      I have also noticed L7030 gets extremely hot yet there is no short to ground and it has 465ohms on both sides. I have also noticed that pp2v5 rail is missing and is showing 65 ohms on the rail. Not sure where to go from here if anyone has any suggestions.
                      Can you indicate the motherboard number?
                      820-01041-A or 820-01814-A?

                        Comment

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