Macbook air A1932 no power

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  • madjid911
    Badcaps Veteran
    • Dec 2016
    • 383
    • France
    #1

    Macbook air A1932 no power

    Hi, I have a MacBook that won't start at all, no sign of life, no display but the trackpad reacts., it's the A1932 820-01521-02 model with T2 chip, I tried to flash it in dfu mode it's detected on my mac, but it gives error 9 when I want to restart the chip, and error 4010 and 75 when I want to restore it, yet the icloud was removed on the icloud site the mac was deleted, anyway it was a little oxidized slightly so I cleaned everything, now I took all the voltages here they are:

    pp3V3_UPC_XB_LDO : 3V27
    PPVBAT_G3H_FUSE : 12V6 UNSTABLE FALLS to 0V187 every 4 seconds
    PPDCIN_G3H_CHGR_AMON : 19V78
    PPBUS_G3H : 12V62 stable
    PP3V3_G3H_RTC : 3V3
    PP1V8_AWAKE : 1V8
    PP3V3_AWAKE : 3V3
    PP1V1_SLPS2R : 1V1
    PP1V8_G3S : 1V8
    PP5V_G3S : 5V
    PP3V3_S5 : 0V 0,6 MOHMS no short
    PP3V3_G3H : 3V3
    LDO_RTC : 1V5

    If anyone can help me please as I am not an expert in troubleshooting. The unstable 12V6 on the fuse makes me think that the t2 chip has a problem and cycles all the time, I tried to reset the SMC and flash the T2 chip but no result and impossible to flash the chip it gives me an error all the time
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 13999
      • Canada
      #2
      Suggest to implant a fresh image of the T2 firmware onto the T2 rom device. The dumps should be available in the ROM / DUMP sub-forum of this website. Backup the original as a CYA (cover your a*s).

        Comment

        • madjid911
          Badcaps Veteran
          • Dec 2016
          • 383
          • France
          #3
          Originally posted by mon2
          Suggest to implant a fresh image of the T2 firmware onto the T2 rom device. The dumps should be available in the ROM / DUMP sub-forum of this website. Backup the original as a CYA (cover your a*s).

          what looks like the SPI chip on the board is U4730 and U4770, which would be the SPI chip?
          Can I take the chip from a donor motherboard? Because I don't have the tool to read this small chip.
          Last edited by madjid911; Yesterday, 10:12 AM.

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 13999
              • Canada
              #4
              The SOC chip for the T2 is the U4770 on your board. You are correct, it is a real bastard of a part that is not even available in North America and has months of lead time even if you are ok with purchasing 2k++ qty on tape & reel. Everyone and their mother sells it on Aliexpress. We now have all of the tools to experiment with this nasty SMD part - still trying to resurrect a dead iMAC that has this part.

              Master Liu noted that it is ok to use T2 SOC from another board to fix a non-working T2 board (any model). Concluding that the DFU process does exactly this. So if you have another T2 board -> locate the local SOC flash device and transplant on to your dead board. Curious to hear of your progress, either way. Be sure to watch the pin #1 orientation of these devices.

                Comment

                • madjid911
                  Badcaps Veteran
                  • Dec 2016
                  • 383
                  • France
                  #5
                  Originally posted by mon2
                  The SOC chip for the T2 is the U4770 on your board. You are correct, it is a real bastard of a part that is not even available in North America and has months of lead time even if you are ok with purchasing 2k++ qty on tape & reel. Everyone and their mother sells it on Aliexpress. We now have all of the tools to experiment with this nasty SMD part - still trying to resurrect a dead iMAC that has this part.

                  Master Liu noted that it is ok to use T2 SOC from another board to fix a non-working T2 board (any model). Concluding that the DFU process does exactly this. So if you have another T2 board -> locate the local SOC flash device and transplant on to your dead board. Curious to hear of your progress, either way. Be sure to watch the pin #1 orientation of these devices.
                  I just tried twice taking the chip two donor motherboard, the result is the same error 4010

                    Comment

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