A2337 820-02016-A Failing DFU mode

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  • TimScrawn
    Member
    • Dec 2021
    • 13
    • United Kingdom
    #1

    A2337 820-02016-A Failing DFU mode

    I have a very strange issue here. Customer was using Mac one day and stopped working when they went to use it the next day. I plugged it into my amp meter and I got 5v at 0.10amp.

    Checked all rails:

    PPBUS_AON: 12,3 V
    PP3V8: 3.79v
    PP3v3_AON: 3.29v
    PPDCIN_AON_CHGR_R: 5 V

    The very strange part of the issue is that I left the Mac on one side for a day, came back to it and reconnected everything. Connected the DFU cable to a WS machine and connected the charger. The Mac then booted to the login screen? I then logged in and because I was after the data, I went to go connect up an external drive to backup on to and disconnected the charger cable and not the DFU cable. Mac shutdown and has not powered up since... (Big mistake). Really struggling to figure out what is causing the issue.

    DFU revive keeps giving error - 4014

    I have used a donor icloud locked board and it works just fine in the housing with the battery charged to 50%

    No liquid damage or history of repair. Board is clean.
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 13984
      • Canada
      #2
      4014 is NAND related. Measure the voltage to ground of the NAND power rails. If they are absent, remove all power and measure their resistance to ground of each.

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