a1708 820-00840 missing PPBUS_G3H

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  • nassih
    Badcaps Veteran
    • Oct 2015
    • 276
    • morocco
    #1

    a1708 820-00840 missing PPBUS_G3H

    hello! I want to open a new topic about MacBook Pro a1708 820-00840 no power giving me some issues.missing PPBUS_G3H
    state before replacing some components:c7078,c7062 was shorted,u6990,d6905
    all this line are not present: USB meter show 5.2v 0amp
    PPVIN_G3H_P3V3G3H : 0.23
    PM_EN_P3V3_G3H_R : 0.12v
    PP3V3_G3H : 0.2
    PPBUS_G3H : 0.02
    NOW i have : USB meter show 20.1v 0.08amp
    PPVIN_G3H_P3V3G3H : 19.75v
    PM_EN_P3V3_G3H_R : 5v
    PP3V3_G3H : 3.4v
    PPBUS_G3H : 0.132v
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 14231
      • Canada
      #2
      Re: a1708 820-00840 missing PPBUS_G3H

      Remove all power. Meter in resistance mode.

      Check the resistance to ground of PPBUS_G3H. Post the measurement.

      You are checking for a low resistance which will cause this rail to shut off due to an excessive load.

        Comment

        • nassih
          Badcaps Veteran
          • Oct 2015
          • 276
          • morocco
          #3
          Re: a1708 820-00840 missing PPBUS_G3H

          resistance to ground of PPBUS_G3H is about 0.7m coming down

            Comment

            • nassih
              Badcaps Veteran
              • Oct 2015
              • 276
              • morocco
              #4
              Re: a1708 820-00840 missing PPBUS_G3H

              it's like we measure a capacity

                Comment

                • nassih
                  Badcaps Veteran
                  • Oct 2015
                  • 276
                  • morocco
                  #5
                  Re: a1708 820-00840 missing PPBUS_G3H

                  R6905 removed i have 8.56v on D6905 side

                    Comment

                    • nassih
                      Badcaps Veteran
                      • Oct 2015
                      • 276
                      • morocco
                      #6
                      Re: a1708 820-00840 missing PPBUS_G3H

                      what do you think mr mon2 you have an idea?

                        Comment

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