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Mac Mini M1 A2348 component identification 820-02091

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    #1

    Mac Mini M1 A2348 component identification 820-02091

    Hi everyone ;-)
    I have a Mac mini M1 in my hands that I would like to keep for myself, I bought it on eBay at a good price. The Mac Mini boots up, emits the initial dong, and immediately dies.
    I saw that unfortunately the schematics and brd are not available so I tried to identify the area that is perhaps shorted, it heats up a lot in that part of the logic.
    Using isopropyl alcohol it seems that the component indicated in the photo heats up, actually with measurement in diode mode it is shorted on both pins but the problem, in addition to being positioned in a place that is difficult to reach but not what it is exactly, seems to be a resistor,, ,,s I'm not wrong but how can I be sure?
    I could try removing it to see if the short goes away but before carrying out any intervention I hope for your help ;-)
    2 Photos
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    #2
    Looks to be the same circuit as Apple Thunderbolt to Ethernet Adapter.
    https://macbidouille.com/news/2012/0...rbolt-ethernet

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      #3
      in fact it seems like the same circuitry, now I have disconnected the IC and the short circuit is no longer present but there is another problem. Although the Mac mini goes into DFU it returns errors during the activation process, which is not completed.
      Could it be the lack of this chip that is creating this problem?
      It seems strange to me, it's linked to the LAN network, it shouldn't affect the restore.

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        #4
        It could be that the activation process is locked to the default factory hardware configuration which includes Ethernet MAC Address, and because you removed the Broadcom IC, hence no Ethernet means a hardware configuration has changed.

        If you're sure that the short was caused by that faulty IC, then after you replaced it, try the activation process again.
        Last edited by прямо; 12-19-2023, 09:13 AM.

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          #5
          Today I finally had some time to dedicate to the Mac mini, I replaced the LAN network chip and a small inductance, which was probably shorted, and it works!!!!!
          Probably the lack of the BCM577762 chip prevented it from booting properly

          Comment

            #6
            Glad to hear you got it fixed!

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