820-00840 PP3V3_S5 shorted

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  • bamboofuto
    Senior Member
    • Nov 2022
    • 53
    • indonesia

    #1

    820-00840 PP3V3_S5 shorted

    Hi all,

    i am working on macbook pro A1708 820-00840 water damage around USB iC U3200 and PMIC U7800. took out U3200 and U7800 but still has shorted on PP3V3_S5.
    i tried to inject 1V and 3.5A but can not detect the heat.

    any suggestion will be appreciated.
  • kevingill
    Senior Member
    • Jun 2013
    • 152
    • England

    #2
    Do you have a thermal camera?

    Comment

    • bamboofuto
      Senior Member
      • Nov 2022
      • 53
      • indonesia

      #3
      Originally posted by kevingill
      Do you have a thermal camera?
      unfortunately i dont have. usually for finding short i use my finger and rosin dispenser

      Comment

      • mon2
        Badcaps Legend
        • Dec 2019
        • 14020
        • Canada

        #4
        What is the resistance to ground of this shorted rail?

        Comment

        • bamboofuto
          Senior Member
          • Nov 2022
          • 53
          • indonesia

          #5
          Originally posted by mon2
          What is the resistance to ground of this shorted rail?
          1.9 ohm short to ground

          Comment

          • mon2
            Badcaps Legend
            • Dec 2019
            • 14020
            • Canada

            #6
            It may be bad news but review this thread:

            https://boards.rossmanngroup.com/thr...shorted.52266/

            continue to update this thread with your progress.

            Comment

            • anhbanxoi
              Senior Member
              • Sep 2021
              • 171
              • VN

              #7
              Touch the CPU you may feel some heat.

              Comment

              • bamboofuto
                Senior Member
                • Nov 2022
                • 53
                • indonesia

                #8
                Originally posted by anhbanxoi
                Touch the CPU you may feel some heat.
                i touch the pch is a bit warm

                Comment

                • bamboofuto
                  Senior Member
                  • Nov 2022
                  • 53
                  • indonesia

                  #9
                  Originally posted by mon2
                  It may be bad news but review this thread:

                  https://boards.rossmanngroup.com/thr...shorted.52266/

                  continue to update this thread with your progress.
                  i touched pch a bit warm..could it be the culprit?

                  Comment

                  • anhbanxoi
                    Senior Member
                    • Sep 2021
                    • 171
                    • VN

                    #10
                    Originally posted by bamboofuto

                    i touched pch a bit warm..could it be the culprit?
                    I think it's gone. I got the same situation with the same board

                    Comment

                    • bamboofuto
                      Senior Member
                      • Nov 2022
                      • 53
                      • indonesia

                      #11
                      Originally posted by anhbanxoi

                      I think it's gone. I got the same situation with the same board
                      sigh.....
                      anyway, thanks for the help anhbanxoi, mon2

                      Comment

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