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A1534 820-00045 Frankenstein

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  • A1534 820-00045 Frankenstein

    2015 a1534 820-00045
    received completely disassembled. Missing tpad, keyboard, audio flex cable. Purchased aftermarket replacements and reassembled.
    No life.
    Took apart and tested the board. Turns on with only charger but PPDCIN_G3H is only 14.8V.
    Attached the display and got an Apple logo with progress bar then shuts off. Reassembled and unplugged one at a time to find the faulty component. Audio flex prevents from turning on at all. Tpad flex allows it to turn on but flashes backlight then off immediately. no tpad cable and it will load to Apple logo.
    Thinking there’s liquid damage on the keyboard or tpad (no sensors tripped).
    Battery doesn’t appear to be picking up a charge - 5v to it when plugged in though.

    Should the machine be turning on with low V on PPDCIN_G3H? Not finding a short. Assuming this is a bad u7100 or u4700 causing to be low?
    Any other reason to turn on and crash?
    Last edited by ThisIsWes:AASP; 08-15-2018, 03:13 AM.

  • #2
    Reading through other posts that say 14v is good on PPDCIN_G3H, though the schematic says 20v and Louis’ video mentions the same.

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    • #3
      15V is normal. There were a few different audio/trackpad cables so it sucks if you do not have the exact number. Did you not plug in audio cable upside down?

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      • #4
        Tried a few different cables and whole known-good machines with just a board swap. Same result - quickly flashes the battery image, then Apple logo, followed by empty progress bar, and finally crash.
        compared to working board - displays battery image longer, then logo.
        Last edited by ThisIsWes:AASP; 08-19-2018, 07:29 AM.

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        • #5
          Put in known good chassis and see if you can do a PRAM reset and do a reinstall of OSX. Corrupted OSX can make it turn off during boot.

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          • #6
            I’m able to boot from another device and can see the internal drive but it won’t mount or erase. “Unable to open device”.
            Tried with Disk Utility, and terminal through bootable recovery and target disk.

            Able to boot into internal recovery mode. The OS volume appears to be corrupt and this drive is built from a corestorage logical volume. Have tried deleting this but keep getting “ownership of affected disks is required”.

            Could this be bad NAND even though I’m able to see the drive and access recovery?

            **ASD passes everything..
            Last edited by ThisIsWes:AASP; 08-22-2018, 06:13 AM.

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            • #7
              I believe that is internet recovery, not built into the drive. I would most likely imagine dead memory. What happens if you boot into a linux install and dd if=/dev/urandom of=/dev/whateveristheinternaldrive and then try to erase the drive from normal internet recovery?

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              • #8
                Originally posted by larossmann View Post
                I believe that is internet recovery, not built into the drive. I would most likely imagine dead memory. What happens if you boot into a linux install and dd if=/dev/urandom of=/dev/whateveristheinternaldrive and then try to erase the drive from normal internet recovery?
                It was definitely the drive recovery mode. No globe, plus the antenna connectors were ripped off. Replaced those then tried internet recovery just to be sure. “sudo diskutil cs delete “Macintosh HD”” tries to delete then fails with due to permissions.

                I noticed the core storage logical volume has about 4mb of free space and “diskutil list” shows 17 separate disk drives with about 15mb total. Compared to another a1534 which has almost 19mb of free space in the logical volume and no extra disk drives. Thinking multiple apfs containers were created and now it doesn’t have enough free space to do anything. System doesn’t recognize as such though and can’t merge disks.

                Will try your suggestion.

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                • #9
                  Originally posted by larossmann View Post
                  I believe that is internet recovery, not built into the drive. I would most likely imagine dead memory. What happens if you boot into a linux install and dd if=/dev/urandom of=/dev/whateveristheinternaldrive and then try to erase the drive from normal internet recovery?


                  No luck. “Input/output error” after 1.6Gb. Shows up in the Disk app with 3 partitions.

                  Is it possible to swap out the memory from a donor on these or would there be firmware issues?
                  Last edited by ThisIsWes:AASP; 08-25-2018, 12:04 AM.

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                  • #10
                    Definitely bad NAND. I haven't tried swapping it yet, so not sure. It has been on my to do list, but most people seem to decide to chuck these if we can't get their data so haven't been able to.

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                    • #11
                      Originally posted by larossmann View Post
                      Definitely bad NAND. I haven't tried swapping it yet, so not sure. It has been on my to do list, but most people seem to decide to chuck these if we can't get their data so haven't been able to.
                      Eh, I’ll give it a shot and see what happens.

                      Also, just saw your post about AASP’s. If you need a now former AASP employee from a university, I’m in.

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