Macbook A2338 820-02020

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  • Instafixx
    Badcaps Veteran
    • Jul 2022
    • 374
    • India
    #1

    Macbook A2338 820-02020

    Received a dead Macbook A2338 820-02020.
    Voltage on PPBUSG3H_AON IS .5 Volts.

    Can anyone here guide where to start looking for short or faulty components.
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 14000
      • Canada
      #2
      Re: Macbook A2338 820-02020

      Remove all power. Measure the resistance to ground of the rail you deem to be low. Checking for shorted caps.

        Comment

        • Instafixx
          Badcaps Veteran
          • Jul 2022
          • 374
          • India
          #3
          Re: Macbook A2338 820-02020

          Originally posted by mon2
          Remove all power. Measure the resistance to ground of the rail you deem to be low. Checking for shorted caps.
          You mean PPBUs_AON
          Last edited by Instafixx; 08-17-2022, 05:42 AM.

            Comment

            • Instafixx
              Badcaps Veteran
              • Jul 2022
              • 374
              • India
              #4
              Re: Macbook A2338 820-02020

              Originally posted by mon2
              Remove all power. Measure the resistance to ground of the rail you deem to be low. Checking for shorted caps.
              Hi,
              I checked PPBUS_AON and found no short. Can you suh=ggest any other rail htat i should check?

                Comment

                • mon2
                  Badcaps Legend
                  • Dec 2019
                  • 14000
                  • Canada
                  #5
                  Re: Macbook A2338 820-02020

                  It is very important to use only the full netnames from the schematic so we can follow the signals.

                  Yes, PPBUS_AON which is too low.

                  What is the exact resistance on this rail to ground ? No power -> meter in resistance mode (not diode mode). Post the reading and the scale used on your meter.

                  With the adapter connected to the logic board -> check if you have a voltage on pin # 1 of the fuse @ F5200. It is possible that the fuse is blown.

                  What is the input voltage for this buck / boost regulator @ U5200 (measure PPDCIN_USBC_AON) ?
                  Attached Files

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