MacBook Air 820-00165-A PPBUS-G3H <1V

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  • Gpl
    New Member
    • Jun 2018
    • 9
    • Italy
    #1

    MacBook Air 820-00165-A PPBUS-G3H <1V

    Hi all, i would like to learn to repair pcb, i'm tring to repair a macbook air 1466 with mb 820-00165-A

    I got ppbus_g3h about 0,9-0,8V, fuse is ok,
    PP3V42_G3H present

    the only thing i can notice is a burn on the cable of the display

    What can i check ?

    thanks.
    Last edited by Gpl; 07-23-2020, 02:31 PM.
    Tags: None
    • luckydip
      Senior Member
      • Aug 2016
      • 159
      • uk
      #2
      Re: MacBook Air 820-00165-A PPBUS-G3H &lt;1V

      check voltages without anything else attached - only dc-in board. Measure resistance on ppbus_g3h.

        Comment

        • Gpl
          New Member
          • Jun 2018
          • 9
          • Italy
          #3
          Re: MacBook Air 820-00165-A PPBUS-G3H &lt;1V

          Originally posted by luckydip
          check voltages without anything else attached - only dc-in board. Measure resistance on ppbus_g3h.
          Thanks, 0,9V is without anything attached, i will check resistence

            Comment

            • Gpl
              New Member
              • Jun 2018
              • 9
              • Italy
              #4
              Re: MacBook Air 820-00165-A PPBUS-G3H &lt;1V

              Resistance to ground on ppbus_g3h is 600ohm

                Comment

                • Gpl
                  New Member
                  • Jun 2018
                  • 9
                  • Italy
                  #5
                  Re: MacBook Air 820-00165-A PPBUS-G3H &lt;1V

                  Removed fuse F7140 still have low voltage on ppbus_g3h

                  checked PPDCIN_G3H, 1,7V goes down to 0,8V

                  PPDCIN_G3H_ISOL : 15V

                  hope to find the sort :-)
                  Last edited by Gpl; 08-07-2020, 12:29 PM.

                    Comment

                    • piernov
                      Super Moderator
                      • Jan 2016
                      • 4435
                      • France
                      #6
                      Re: MacBook Air 820-00165-A PPBUS-G3H &lt;1V

                      Originally posted by Gpl
                      checked PPDCIN_G3H, 1,7V goes down to 0,8V
                      PPDCIN_G3H_ISOL : 15V
                      Not possible. PPDCIN_G3H_ISOL is derived from PPDCIN_G3H.
                      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

                        Comment

                        • Gpl
                          New Member
                          • Jun 2018
                          • 9
                          • Italy
                          #7
                          Re: MacBook Air 820-00165-A PPBUS-G3H &lt;1V

                          Sorry, my mistake,
                          PPDCIN_G3H = 15,04V and also PPDCIN_G3H_ISOL

                          PPDCIN_G3H_INRUSH = 0,9V
                          CHGR_SGATE_DIV = 0,9V

                          PP5V1_CHGR_VDD = 5,14V
                          PP5V1_CHGR_VDDP = 5,14V

                            Comment

                            • piernov
                              Super Moderator
                              • Jan 2016
                              • 4435
                              • France
                              #8
                              Re: MacBook Air 820-00165-A PPBUS-G3H &lt;1V

                              What about ACIN and DCIN of U7100? Resistance between pins 17/18 and between pins 27/28 of U7100?

                              EDIT: and resistance between pins 26/27 of U7100 as well
                              Last edited by piernov; 08-07-2020, 03:14 PM.
                              OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

                                Comment

                                • Gpl
                                  New Member
                                  • Jun 2018
                                  • 9
                                  • Italy
                                  #9
                                  Re: MacBook Air 820-00165-A PPBUS-G3H &lt;1V

                                  CHGR_ACIN = 3,92 V
                                  CHGR_DCIN = 14,72V

                                  resistance between pins 17 and 18 is 3,4 ohm
                                  resistance between pins 26 and 27 is 164,9 kohm

                                  Thanks

                                    Comment

                                    • piernov
                                      Super Moderator
                                      • Jan 2016
                                      • 4435
                                      • France
                                      #10
                                      Re: MacBook Air 820-00165-A PPBUS-G3H &lt;1V

                                      And between 27/28? If it's 20 ohms you can try replacing U7100.
                                      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

                                        Comment

                                        • Gpl
                                          New Member
                                          • Jun 2018
                                          • 9
                                          • Italy
                                          #11
                                          Re: MacBook Air 820-00165-A PPBUS-G3H &lt;1V

                                          Yes, between 27/28 of U7100 resistance is 20,1 ohms

                                          can i use a new U7100 ?

                                          I also have another board with fan that spins but not boot

                                            Comment

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