Macbook Pro 13" M1 bootloop

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  • Roll
    Member
    • Mar 2022
    • 36
    • Czech Republic
    #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
    • mon2
      Badcaps Legend
      • Dec 2019
      • 13830
      • Canada
      #2
      Re: Macbook Pro 13" M1 bootloop

      Boot with a SMC bypass. Any difference?

        Comment

        • mon2
          Badcaps Legend
          • Dec 2019
          • 13830
          • Canada
          #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

            • Roll
              Member
              • Mar 2022
              • 36
              • Czech Republic
              #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

                • mon2
                  Badcaps Legend
                  • Dec 2019
                  • 13830
                  • Canada
                  #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

                    • mon2
                      Badcaps Legend
                      • Dec 2019
                      • 13830
                      • Canada
                      #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.

                        Comment

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