Macbook 2015 motherboard help!

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  • bjhawfam
    Senior Member
    • Dec 2014
    • 144
    • United States

    #1

    Macbook 2015 motherboard help!

    Was hoping for a little more help and/or some advice. The motherboard is an 820-4924-a (schematic and board view included) I had a few shorts and repaired them. When checking voltages they're off, PP18v5_dcin_conn_r is at 16.3V. Also on PPVIN_G3H_P3V42G3H is getting the same 16.3volts, ppbus_g3h_r is at 12.9v. I replaced U7090, c7090, c7091and c7092 (one of the caps was shorted to ground) the short was causing r7020 to smoke, replaced it and fixed the short now voltages are off...
    Attached Files
    Last edited by bjhawfam; 07-31-2019, 10:46 PM. Reason: adding schematic and brd view
  • piernov
    Super Moderator
    • Jan 2016
    • 4435
    • France

    #2
    Re: Macbook 2015 motherboard help!

    What is the issue?
    OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

    Comment

    • bjhawfam
      Senior Member
      • Dec 2014
      • 144
      • United States

      #3
      Re: Macbook 2015 motherboard help!

      The issue is, will not power on and the magsafe charger light is very dim.

      Comment

      • piernov
        Super Moderator
        • Jan 2016
        • 4435
        • France

        #4
        Re: Macbook 2015 motherboard help!

        SMC not communicating with Magsafe then.
        Try another Magsafe2 60W/85W and another DC-in board, and check voltage on PP3V42_G3H, SMC_RESET_L.
        Measure exact voltage on PPBUS_G3H (12.xxV).
        OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

        Comment

        • bjhawfam
          Senior Member
          • Dec 2014
          • 144
          • United States

          #5
          Re: Macbook 2015 motherboard help!

          Tried both a 60w and an 80w MagSafe no change. Voltages for the following are; pp3v42 = 3.42v , voltage for SMC_RESET_L = 3.38V and the voltage for PPBUS_G3H = 12.29v will try another dc in board as well...... Tried another DC in board , same result, solid low light stays on....
          Last edited by bjhawfam; 08-01-2019, 07:47 PM. Reason: more info

          Comment

          • piernov
            Super Moderator
            • Jan 2016
            • 4435
            • France

            #6
            Re: Macbook 2015 motherboard help!

            SMC is not turning on. If there is any liquid damage near the SMC, you can try to reflow it.
            OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

            Comment

            • bjhawfam
              Senior Member
              • Dec 2014
              • 144
              • United States

              #7
              Re: Macbook 2015 motherboard help!

              Thanks for the help. I tried a reflow, I believe the chip may be bad will get one from a donor board and pray I can swap it.

              Comment

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