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
  • mon2
    Badcaps Legend
    • Dec 2019
    • 13871
    • 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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