820-4924 Won't run on battery

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  • BrickBreaker
    Senior Member
    • Jan 2018
    • 52
    • United States
    #1

    820-4924 Won't run on battery

    4924, liquid damage near the magsafe conn, R7005 and D7005 replaced, got power.
    Battery charges. Won't run off battery. Shutsdown immediately upon remove magsafe.
    Tried replacing ISL, Q7130, Q7155 same time. No change.
    With just battery, PPBUS measures 12.64V
    Won't power on with power button on battery only.
    Tried three total batteries, orig plus two testing batteries.
    Tags: None
    • piernov
      Super Moderator
      • Jan 2016
      • 4435
      • France
      #2
      Re: 820-4924 Won't run on battery

      PP3V42_G3H on battery only?
      Are you sure PPBUS_G3H is 12.64V on battery only? (rather than with Magsafe connected)
      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

        Comment

        • BrickBreaker
          Senior Member
          • Jan 2018
          • 52
          • United States
          #3
          Re: 820-4924 Won't run on battery

          Solved. The hint is in the original problem, first line in the post. What voltage did I measure, what was missing, and what soldering mistake did I make?

            Comment

            • BrickBreaker
              Senior Member
              • Jan 2018
              • 52
              • United States
              #4
              Re: 820-4924 Won't run on battery

              Ah you got it already, no 3v42 was not present on battery only. PPBUS was indeed 12.6V though. Hint problem wasn't a short but an OL.

                Comment

                • BrickBreaker
                  Senior Member
                  • Jan 2018
                  • 52
                  • United States
                  #5
                  Re: 820-4924 Won't run on battery

                  It lives! Still need to place a tpad connector but I did the hard stuff and the vital stuff.

                    Comment

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