MacBook A2442 exclamation mark after oxydation

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  • Enzo150i
    Enzo
    • May 2021
    • 14
    • Italy
    #1

    MacBook A2442 exclamation mark after oxydation

    Hi all,
    I have a MacBook Pro A2442 with board 820-02098-A very highly oxydated (water) by an accident.
    The customer just need to recover the data (no backups, heh), so we cleaned fully to make it power on.
    Fortunately the Mac is still alive but it shows an exclamation mark in a circle (!) (Apple T2 fw issue?) with the text "support.apple.com/mac/restore" and doesn't go further.

    We tried to interface with another Mac, but can't get in DFU. Very likely the keyboard is gone too because the water, so we're planning to buy a cheap compatible one just to.
    Before we do this I would ask if there's something we could check before (maybe a faulty data line?) and if the recovery will delete any data on it to restore the Mac.

    We need to extract data, other stuff is not important.

    Thank you!
    Attached Files
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    • Enzo150i
      Enzo
      • May 2021
      • 14
      • Italy
      #2
      Anyone, please? We're afraid to do a bad move because of data

        Comment

        • mon2
          Badcaps Legend
          • Dec 2019
          • 14634
          • Canada
          #3
          Are these pics before or after the cleaning? Can you share the pics after the cleaning? Do you have the proper power rails for these SSD devices? Personally have not performed data recovery at this level yet. If possible, try to work with the board in front of you. Plan B is to move these devices + T2 onto another working good board. Believe that is the alternate procedure.

          The '!' symbol usually equates to the SSD not being detected. This could be due to the lack of power to the SSD rails or the SSD is defective. Cannot recall if A2442 is one of the models with the nasty TI regulator voltage overshoot fault. Will investigate.

            Comment

            • Enzo150i
              Enzo
              • May 2021
              • 14
              • Italy
              #4
              Hi! Sorry for the delay. The pics posted before are before the cleaning, just to show you all which parts were oxydated. Attached the pics of the cleaned board and the "!" simbol on screen.
              I've not checked any power rail yet, to be honest, since it powers on. I've seen online that this kind of error is about the T2 so I've not checked anything. The Mac does not go into recovery and/or boot option, but again it could be a bad keyboard.
              Unfortunately we don't have right now a donor board to swap stuffs on, we should buy it in case, but if we can try to just start this would be better.

              Thanks!
              Attached Files

                Comment

                • Enzo150i
                  Enzo
                  • May 2021
                  • 14
                  • Italy
                  #5
                  mon2 any suggestion, please? 🥺

                    Comment

                    • mon2
                      Badcaps Legend
                      • Dec 2019
                      • 14634
                      • Canada
                      #6
                      A globe with an exclamation mark on a Mac startup screen indicates that the computer is unable to locate a valid startup disk. This often occurs after failed attempts to recover macOS. To address this, you can try booting into Internet Recovery (Command + Option + R) to reinstall macOS. If that doesn't work, check the internal SSD connection or use Disk Utility to repair the drive.

                      Share the voltages to ground of the SSD power rails.

                        Comment

                        • reformatt
                          Badcaps Legend
                          • Feb 2020
                          • 1472
                          • Australia
                          #7
                          Are the NAND's underfilled? If not, highly likely they're contaminated. See if the SSD is visible in recovery mode.

                          NAND's are encrypted by the T2. You'd have to move the NAND's (to the exact same locations) and T2 to another board to get data if the board is U/S. This best done by some who is experienced (like iBoff, those kind of guys).

                            Comment

                            • Enzo150i
                              Enzo
                              • May 2021
                              • 14
                              • Italy
                              #8
                              NANDs have glue all around, so they should be not contaminated, but we suspect some other chip is still contaminated under it and we will try to remove, clean and reball them all...
                              Unfortunately we don't have a donor board to swap parts on right now. We'll let you updated.

                                Comment

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