Macbook A1708 820-00840 not a start

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  • AlexVG
    Senior Member
    • Apr 2022
    • 134
    • SPAIN

    #1

    Macbook A1708 820-00840 not a start

    Hi everybody

    I have Macbook A1708 820-00840
    It goes through all steps to start
    exclude last steps power PPVCCCPU_S0G and PPVCCGT_S0G

    Besides, no exchange on
    CPU_VIDSCLK
    CPU_VIDSOUT

    However CPU_PWRGD is OK
    CPU_PROCHOT is down.

    I replaced SPI dump from here:
    https://www.badcaps.net/forum/troubl...n-me-pram-bios
    Unfortunately did't help me.

    Would you help me please to identify the problem?
    Thank you.
  • mon2
    Badcaps Legend
    • Dec 2019
    • 14060
    • Canada

    #2
    What is the voltage to ground of PPBUS_G3H?

    Comment

    • AlexVG
      Senior Member
      • Apr 2022
      • 134
      • SPAIN

      #3
      13.5V

      Comment

      • mon2
        Badcaps Legend
        • Dec 2019
        • 14060
        • Canada

        #4
        Do you have 20v on the type c meter and external power adapter?

        What is the current draw showing on the same meter?

        Comment

        • AlexVG
          Senior Member
          • Apr 2022
          • 134
          • SPAIN

          #5
          Yes.
          20V
          250mA stable

          Comment

          • mon2
            Badcaps Legend
            • Dec 2019
            • 14060
            • Canada

            #6
            When you apply the power adapter, does the 20v immediately spike to 250mA stable or slowly climbs up to this value?

            Comment

            • AlexVG
              Senior Member
              • Apr 2022
              • 134
              • SPAIN

              #7
              5V (1sec) - 7V (0.5 sec) - 20V
              150mA (1sec) - 250mA

              Comment

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