820-00293 - No power - Stuck on 5v 0.06A

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  • ronaldopdias
    Senior Member
    • Jul 2015
    • 91
    • United Kingdon

    #1

    820-00293 - No power - Stuck on 5v 0.06A

    Board Model: 820-00923
    Issue: Board takes 5V @ 0.694A on all ports. No signs liquid.

    Customer stated: Died during an update whilst battery was at 10%. Tried plugging in but it died.

    Board takes 5V at 0.06A on all USB-C ports..
    Board is clean with no visible corrosion or liquid damage.

    PP1V8_UPC_TA_LDOA - 1.8V
    PP3V3_UPC_TA_LDO - 3.32V
    PP1V8_UPC_TA_LDOD - 1.8V
    PP1V1_UPC_TA_LDO_BMC - 0V

    PP1V8_UPC_TB_LDOA - 1.8V
    PP1V1_UPC_TB_LDO_BMC - 0V
    PP1V8_UPC_TB_LDOD - 1.8V
    PP3V3_UPC_TB_LDO - 3.28V

    PP3V3_UPC_XB_LDO - 3.1V
    PP1V8_UPC_XB_LDOA - 1.8V
    PP1V8_UPC_XB_LDOD - 3V
    PP1V1_UPC_XB_LDO_BMC - 0V

    PP3V3_UPC_XA_LDO - 3.3V
    PP1V8_UPC_XA_LDOA - 1.8V
    PP1V8_UPC_XA_LDOD - 1.8V
    PP1V1_UPC_XA_LDO_BMC - 0V

    PPBUS_G3H - 0V
    PPDCIN_G3H - 5.16V

    Battery connected doesn't make any difference.
    USB-C current does not change regardless of port used.

    Parts Replaced:
    • U7000
    • U7800
    • CD3215 – replaced all 4 with known-good chips from a donor board.
    • U2890/UB090 (TBT ROM) – replaced from a good known board.
    • SMC chip – replaced with a good one from a donor.
    Appreciate any help, please.
  • mon2
    Badcaps Legend
    • Dec 2019
    • 13830
    • Canada

    #2
    PPBUS_G3H - 0V
    Remove all power. Meter in resistance mode. What is the exact resistance to ground of PPBUS_G3H?

    Comment

    • mon2
      Badcaps Legend
      • Dec 2019
      • 13830
      • Canada

      #3
      None of the _BMC rails are at 1V1 while in use of that port?

      PP1V8_UPC_XB_LDOD - 3V
      This does not look correct.

      Comment

      • ronaldopdias
        Senior Member
        • Jul 2015
        • 91
        • United Kingdon

        #4
        PPBUS_G3H​ - 0.459 in diode mode.

        Comment

        • mon2
          Badcaps Legend
          • Dec 2019
          • 13830
          • Canada

          #5
          U7000 is a suspect since 0v output and part was replaced.

          Consuming 60mA or 600mA?

          Comment

          • ronaldopdias
            Senior Member
            • Jul 2015
            • 91
            • United Kingdon

            #6
            PP1V8_UPC_XB_LDOD was 3V because I kicked out C3205. After replacing it, it now gets 1.8V.
            Also, I found a short on PPVIN_G3H_P3V3G3H leading to faulty cap C7081. Cap replaced and same results.
            Stuck on 5v @ 0.04A

            Comment

            • ronaldopdias
              Senior Member
              • Jul 2015
              • 91
              • United Kingdon

              #7
              U7000 replaced and still the same.
              40mA

              Comment

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