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MacBook A1989 820-00850-A

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    MacBook A1989 820-00850-A

    Hi all,

    I've got a Macbook 2018 with touchbar that doesn't seem to be powering on. Doesn't have liquid damage or visible damage.
    - takes 20.2V and 0.4-0.5A
    - lcd doesnt appear to be turning on
    - no backlight, no keyboard light, no touchbar

    I got the schematic, and started to measure voltage on some components.
    Some clues where to start looking would be most welcome
    Any help is welcome

    #2
    Re: MacBook A1989 820-00850-A

    Measure and post the voltage of

    1) PPBUS_G3H.

    2) I2C lines.

    See attached.
    Attached Files

    Comment


      #3
      Re: MacBook A1989 820-00850-A

      Ppbus_g3h 12.6v
      i2c_pwr_scl 1.8v
      i2c_pwr_sda 1.8v

      Comment


        #4
        Re: MacBook A1989 820-00850-A

        Its fixed! It wasn't a hardware issue after all.
        I was able to get another Mac with usb-c and restore mine using DFU mode and Apple Configurator 2 on the working mac

        This guide is very helpful on how to enter DFU and how to restore:
        https://mrmacintosh.com/how-to-resto...into-dfu-mode/

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