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820-332 green light no power Q8930

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  • 820-332 green light no power Q8930

    Hello, I have a 820-3332 with liquid damage. I have never worked on one of these boards before. The only thing I can see visually is Q8930 which isn't looking too good nor is plane around it. I see what look like many little vias next to it which have lifted along with the res of the exposed circuit. Im wondering if this is even repairable because I'm not sure where any of them go. Is this even worth me getting a donor board for? I don't see any other damage anywhere on the board at all. Is this something that is common to fail and does it kill any other components along with it?
    Last edited by dong; 09-17-2016, 01:15 PM.

  • #2
    Do you have PPBUS_G3H. Any Voltage on S5, S3, or S0 Rails?

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    • #3
      Magsafe remains orange even when battery is unplugged

      PPBUS_G3H 0.165V - 0.217V diode mode it drops from 10.0 instantly to 0.3

      PP3V3_S5 0.76V diode mode 0.529

      PP3V3_S3 0.1V diode mode 12.16

      PP3V3_S0 0.1V diode mode 4.1





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      • #4
        That doesn't fare well for the GPU, but probably isn't the primary issue.

        Does this have a green light on the charger?

        What is the resistance between pins 17/18 and 27/28 of U7000?

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        • #5
          When connecting the magsafe the light is green for a few seconds and then turns orange.

          17/18 is 4.4

          27/28 is 22.0

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          • #6
            Q8930 is obviously shorted. Start with replacing Q8930 and U8900 and pray the GPU survived.

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            • #7
              Ok. I don't have a donor board and ordered one but tis from China so god knows when it will get here. Louis if your open tomorrow could I stop by and buy a donor board or two from you?

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              • #8
                i barely have enough fro myself, and I can guarantee you they're all missing Q8930

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                • #9
                  This is what the area looks like once I removed it. All 6 pads have continuity. PPBUS_G3H short still present. I can see the exposed copper for PPVIN_S5_HS_GPU_ISNS might be touching the exposed copper circuit for pad 1 and 2 on Q8930. The PPVIN_S5_HS_GPU_ISNS copper seems pretty loose should I gently pry it off the Q8930 p1 and p2 copper or leave it alone?
                  Last edited by dong; 09-18-2016, 03:40 PM.

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                  • #10
                    ..........
                    Last edited by dong; 09-18-2016, 03:40 PM. Reason: fixed previous post

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                    • #11
                      Looks like a short in the board to me. It's pretty cremated around there.

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                      • #12
                        Yea burn is very deep. Believe it or not all that surface stuff was lose and even when I got to this point i was still scraping ash out of the board which was revealing more layers. RIP.

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