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A1466 PPBUS_Shorted

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    #1

    A1466 PPBUS_Shorted

    Hello,
    Namaste!

    I have a Macbook A1466 820-00165 with a PPBUS_G3H shorted to ground.

    Removed the Fuse and i checked all the tantalum capacitors.

    Found the shorted one. Removed it.
    Now no Short.

    Replaced the capacitor. Replaced the Fuse, but still getting only 1V on PPBUS_G3H.
    I thought maybe the fuse was bad. Hence replaced it as well. But as soon as i plugged in the charger, the fuse burned.

    What can be the issue here ?
    Tags: None
    #2
    Re: A1466 PPBUS_Shorted

    If the fuse is burning, then there is an excessive current draw on the rail.

    Remove the fuse and power up again. Check the voltage of ppbus_g3h to ground. Is it normal? If not, then ISL side needs to be reviewed.

    Do not apply the fuse till the downside rail is with a high resistance to ground. Had the same fault last week and fault was a single shorted cap. Perhaps you have more than one on the board with a short.

    Be sure the fuse you are using is the proper rating of 8A - fast blow in 1206 package.

    Comment

      #3
      Re: A1466 PPBUS_Shorted

      Originally posted by mon2 View Post
      If the fuse is burning, then there is an excessive current draw on the rail.

      Remove the fuse and power up again. Check the voltage of ppbus_g3h to ground. Is it normal? If not, then ISL side needs to be reviewed.

      Do not apply the fuse till the downside rail is with a high resistance to ground. Had the same fault last week and fault was a single shorted cap. Perhaps you have more than one on the board with a short.

      Be sure the fuse you are using is the proper rating of 8A - fast blow in 1206 package.
      Without the Fuse.

      Voltage on Pin#2 is 0.7V
      Voltage on Pin#1 in 8.6V

      Comment

        #4
        Re: A1466 PPBUS_Shorted

        Measure the resistance to ground on pin # 2 (no fuse installed).

        Comment

          #5
          Re: A1466 PPBUS_Shorted

          Originally posted by mon2 View Post
          Measure the resistance to ground on pin # 2 (no fuse installed).
          Diode Mode Reading of Pin#2 (Meter Set to 2k Scale)
          Red to Ground .423
          Black to Ground 1.302 .

          Comment

            #6
            Re: A1466 PPBUS_Shorted

            Found another Capacitor Shorted. Replaced. Resolved

            Comment

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