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Macbook Pro 13" M1 bootloop

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    #1

    Macbook Pro 13" M1 bootloop

    Hello there.
    A2338 820-02020 13" Pro M1 came to me with small water damage near JF200 and JF201. After cleaning and replacing few capacitors (CY140, CY141 and CF400) it tries to boot, but after few seconds of Apple logo it makes a ticking sound and reboots.
    I don't see any more corrosion on the board, some test points were damaged, so I scratched them clean.

    I tried the board in other body, but it's the same, so it's not issue with peripherals.
    I have reballed both USB controllers and UC300 (in case there would be hidden corrosion), but there is no change.

    Any ideas? Thanks
    Tags: None
    #2
    Re: Macbook Pro 13" M1 bootloop

    Boot with a SMC bypass. Any difference?

    Comment

      #3
      Re: Macbook Pro 13" M1 bootloop

      Also review this to confirm against your motherboard:

      https://blog.rewa.tech/detail/how-to...-won-t-turn-on

      Comment

        #4
        Re: Macbook Pro 13" M1 bootloop

        M1 macs do not have any SMC, so there is nothing to reset or bypass.
        It gets into 20V mode, charges battery etc. but it's rebooting on Apple logo.

        Comment

          #5
          Re: Macbook Pro 13" M1 bootloop

          Check the voltage to ground of the I2C / SMBUS lines (SDA / SCL) - confirm their parked voltage levels match the schematic. That is, 1v8, 3v3, etc.

          Comment

            #6
            Re: Macbook Pro 13" M1 bootloop

            To me, ticking sound is the switching power supply entering the audible zone. Do check the power inductors for a short.

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