A1259 820-01598 sticks to the logo (water damage)

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  • mbcontrol
    Member
    • Apr 2020
    • 13
    • Germany
    #1

    A1259 820-01598 sticks to the logo (water damage)

    Hello everybody,

    I'm working on an 820-01598 with water damage. I've already done a lot on the board ...

    it started with the power supply was only delivering 5 volts - the 20 volts were missing.

    There was a short to ground on PP3V3_G3H_RTC below J6700 PIN15 (keyboard-connector). I had to go 5 or 6 layers deep to remove the short circuit. To PIN15 (PP3V3_G3H_RTC) I pulled a wire bridge.

    Since this work, the power supply is delivering the 20 volts and the Macbook starts up (i have only connected the display and charger for the tests). However, it sticks to the Apple logo.

    After a while starting, the current of the charger is changing something between 480mA to 530mA .

    I am very grateful for any help to come forward with my troubleshooting.

    (Boardview and schematics are available if necessary)
    Tags: None
    • piernov
      Super Moderator
      • Jan 2016
      • 4435
      • France
      #2
      Re: A1259 820-01598 sticks to the logo (water damage)

      Did you try booting from an external drive?
      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

        Comment

        • mbcontrol
          Member
          • Apr 2020
          • 13
          • Germany
          #3
          Re: A1259 820-01598 sticks to the logo (water damage)

          Hi piernov,
          thanks for the tip, I could have figured it out myself. I was so deep in the troubleshooting tunnel :-(

          I tested it with an installation stick for HighSierra - it boots without any problems.

          A few things still need to be fixed - e.g. Audio doesn't work right now. But I think I've already seen the faulty corroded areas for it.

          I will continue to work on the board and hopefully fix any bugs.

          Thank you for your help, piernov.

            Comment

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