MacBook Pro 16 M1 Pro Liquid Damage (820-02100)

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  • mitchw
    Senior Member
    • Dec 2016
    • 136
    • Slovenia

    #1

    MacBook Pro 16 M1 Pro Liquid Damage (820-02100)

    Got a MacBook Pro M1 Pro 16'' to rescue immediately after liquid accident - I got it in less than 30 minutes after the spill.
    It got spilled from behind when the laptop was closed. It mostly affected the rear of the mainboard and the bottom of the LCD.

    I quickly took it apart and washed the liquid residue off the mainboard.
    The area around the UP800 had some light corrosion, but it just washed away with some IPA. Other areas looked undamaged.

    The mainboard got a thorough cleaning, as did the top case and LCD connectors / cables.

    Now the laptop boots into OS only if the main LCD is disconnected.
    If I leave it connected, it will power on for about 15 seconds and then reboot. No image on the screen whatsoever.

    Sadly, I don't have another LCD to test, so I am not 100% if it is LCD or the mainboard that is at fault.
    PPVOUT_LUXE_XW is 11.5V which it too low from what I can tell, but it might be just an indication of a bad LCD.

    Any other tests I can do?
    Customer is happy that their data is still intact, but it would be even nicer if the laptop gets repaired.
  • mon2
    Badcaps Legend
    • Dec 2019
    • 14023
    • Canada

    #2
    Test with external monitor. Do you see all graphics?

    Comment

    • mitchw
      Senior Member
      • Dec 2016
      • 136
      • Slovenia

      #3
      Yes, it works with external monitor with no problems. I can log in to system, etc.

      Comment

      • mon2
        Badcaps Legend
        • Dec 2019
        • 14023
        • Canada

        #4
        Remove all power. Meter in resistance mode. Measure the resistance to ground of PP3V8_AWAKE_TCON. You should be able to do so at RD892.

        Measure the resistance between PP3V8_AWAKE_TCON_ISNS and PP3V8_AWAKE_TCON_ISNS_R. This measurement should be 0R ohms on your meter.

        Comment

        • mitchw
          Senior Member
          • Dec 2016
          • 136
          • Slovenia

          #5
          PP3V8_AWAKE_TCON = 0.570 diode / 2 Megaohms resistance
          Between PP3V8_AWAKE_TCON_ISNS and PP3V8_AWAKE_TCON_ISNS_R I get 0 ohms

          Comment

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