A2251 No power/ Stuck in DFU

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  • tommy97
    Senior Member
    • Mar 2023
    • 143
    • United Kingdom
    #1

    A2251 No power/ Stuck in DFU

    Hi,

    i'm having a problem with A2251 after the liquid damage, before it got to us, customer went to other repair store, and we don't know what was done. Laptop stucked on 20V 0amp, i tried to revive bridgeOS no luck, error -1.

    PP3v3_S5 - Normal
    PPBus - Normal for DFU
    PP2v5_NAND_SSD_0 - normal (and resistance about 45Ohm)

    Liquid damage was mainly next to ISL from that what i've noticed.
    Attached Files
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 13830
      • Canada
      #2
      What is the exact voltage to ground of PPBUS_G3H​? PP2v5_NAND_SSD_0 ?

        Comment

        • mon2
          Badcaps Legend
          • Dec 2019
          • 13830
          • Canada
          #3
          The error code -1 indicates that the device is unable to communicate with the Apple server.

          Check your internet connection - use a reliable USB to Ethernet port adapter (with Asix controller is recommended).

            Comment

            • tommy97
              Senior Member
              • Mar 2023
              • 143
              • United Kingdom
              #4
              PP2v5_NAND_SSD_0 2.5V
              PPBUS_G3H 12.59V

              "The error code -1 indicates that the device is unable to communicate with the Apple server." - got an Ethernet adapter, DFU seems to go through, now it shows me that screen, no changes, tried update through DFU and it says that action cannot be done.
              Attached Files

                Comment

                • tommy97
                  Senior Member
                  • Mar 2023
                  • 143
                  • United Kingdom
                  #5
                  Any idea what to check further? mon2

                    Comment

                    • mon2
                      Badcaps Legend
                      • Dec 2019
                      • 13830
                      • Canada
                      #6
                      Review the last 2 posts here and keep updating this thread:

                      https://forums.macrumors.com/threads...dlock.2293187/

                        Comment

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