Macbook A1466 820-00165 PPBUS Missing

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

    Macbook A1466 820-00165 PPBUS Missing

    Hello, I have a Macbook A1466 80-00165 which is not turning on. It is taking 0 ohms and the PPBUS_G3H is at 0v at F7140.

    Tried Injecting 1V but nothing gets hot.
    Removed the F7140 fuse and the Pin#2 is still short to ground.

    Can anyone suggest where the issue is ?
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 13830
      • Canada
      #2
      Re: Macbook A1466 820-00165 PPBUS Missing

      What is the exact resistance in ohms to ground of pin #2?

      Remove all power before measuring resistance.

      Are you using the original magsafe adapter?

      3v42 rail is ok and stable?

        Comment

        • Instafixx
          Badcaps Veteran
          • Jul 2022
          • 374
          • India
          #3
          Re: Macbook A1466 820-00165 PPBUS Missing

          Originally posted by mon2
          What is the exact resistance in ohms to ground of pin #2?

          Remove all power before measuring resistance.

          Are you using the original magsafe adapter?

          3v42 rail is ok and stable?

          Found C7434 PPBUS_S5_HS_COMPUTING_ISNS short. Replaced it. Replaced the Fuse to check and getting 8.6V now on both pins but the device wont turn on. No Fan Spin as well.

          Removed the Fuse and Removed Power.

          Resistance at F7140

          Pin#1 133 Ohms
          Pin#2 475 ohms


          Magsafe Charger is Original.

          PP3v42 is stable.

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 13830
              • Canada
              #4
              Re: Macbook A1466 820-00165 PPBUS Missing

              Resistance at F7140

              Pin#1 133 Ohms
              Pin#2 475 ohms
              Both of these are too low of a resistance value.

              Can you confirm the readings? Test with another meter.

              Do you have a thermal camera?

                Comment

                • Instafixx
                  Badcaps Veteran
                  • Jul 2022
                  • 374
                  • India
                  #5
                  Re: Macbook A1466 820-00165 PPBUS Missing

                  Originally posted by mon2
                  Both of these are too low of a resistance value.

                  Can you confirm the readings? Test with another meter.

                  Do you have a thermal camera?
                  Visual Inspection showed that U6100 seemed burned out. Replaced that. It is working fine now.

                    Comment

                    • Instafixx
                      Badcaps Veteran
                      • Jul 2022
                      • 374
                      • India
                      #6
                      Re: Macbook A1466 820-00165 PPBUS Missing

                      Originally posted by mon2
                      Both of these are too low of a resistance value.

                      Can you confirm the readings? Test with another meter.

                      Do you have a thermal camera?
                      So i have an issue on this Mac, was sick so was away from office these days.
                      After replacing the U6100, the macbook has become very slow. If it goes to sleep it would take a very very very long time to come back awake as if it had shut. So i went ahead and did an internet recovery to go back to a faster MacOS. But after that it doesnt boot up. The loading bar comes with the apple logo, it goes upto the end but wont boot up.

                      Have i installed the wring U6100 version chip or is it something else.

                        Comment

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