Water Damege 820 - 01958A no Power on

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  • macrepair
    Member
    • Dec 2017
    • 21
    • germany
    #1

    Water Damege 820 - 01958A no Power on

    Hi

    I have a Problem with a Macbook Air 13 2020. It has Waterdamage. If i plug the USB C, it not starting and no boot. It do nothing. Only the T2 IC and U7800 is warm. Can you pls help me. There is no PP5V_G3S and PP3V_G3S. There is PP3V3_G3H = 3,2V but P3V3MAIN_PGOOD is missing. Is that normal ?

    I measered the Power Rail:

    PPBUS_G3H = 12,3V

    PPBUS_HS_CPU = 12,3V

    PPDCIN_G3H = 20,3V

    PP5V_G3S = 0V

    PP5V_S5_LDO = 0V

    PPVIN_G3H_P5VG3S = 12,4V

    PPVIN_G3H_P3V3G3H = 12,4V

    PPVIN_G3H_P3V3G3HRTC = 12,3V

    PP3V3_G3H_PMU_VDDMAIN = 3,2V

    PP3V3_G3S_WLANBT = 0V

    PP1SR3V3_G3H_P0V6_S3_VIN = 3,2V

    PPBUS_G3H_SSD0 = 12,3V

    PPBUS_G3H = 12,3V

    PPVIN_G3H_P1V1_S3 = 12,38V

    PP3V3_G3H_RTC = 3,3V

    PP3V3_G3H = 3,2V

    PP3V3_G3SSW_SNS = 0V

    PP3V3_G3S = 0V

    PPBUS_G3H_SPKRL = 12,3V

    PPVCC_NAND_SSD0 = 0V

    PP1V8_G3S = 0V

    PPVCC_S0_CPU = 0V

    PPVCCIN_AUX_PCH

    PP1V8_PRIM_PCH

    PP1V1_S3

    PP0V6_S3





    PPVDDCPU_AWAKE = 0,76V

    PPVDDCPUSRAM_AWAKE = 0,8V

    PP0V82_SLPDDR = 0,8V

    PP1V8_SLPS2R = 1,8V

    PP1V8_AWAKE = 1,8V

    PP1V8_S3 = 0V

    PP1V8SW_VCCQIO_SSD0 = 0V

    PP1V1_SLPS2R = 1,1V

    PP1V1_SLPDDR = 1,1V

    PP0V9_SLPDDR = 0,9V

    PPVNN_PCH_EXT_REG = 0V

    PP1V05_PCH_EXT_REG = 0V

    PP1V05_PCH_VCCPRIM

    PP1V05_PCH_CPU

    PP0V9_SSD0 = 0V

    PPVCCQ_ANI_SSD0

    PP0V8_SLPS2R = 0,8V

    PP3V_G3H = 3,0V

    PP1V2_AWAKE = 1,2V

    PP3V3_AWAKE = 3,24V

    PP3V3_S5 = 0V
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 13894
      • Canada
      #2
      Re: Water Damege 820 - 01958A no Power on

      P5V_G3S = 0V

      Check and post the voltage reading of P5VG3S_EN_DLY

      The P5VG3S_EN_DLY signal is driven by U7610. Investigate that this circuit is operating correcting by reviewing the INPUT to U7610 (pin # 1).

      Be sure that R7613 is still present.

      U7610 single gate IC is being powered via pin # 5 ?

      Post your readings.
      Attached Files

        Comment

        • macrepair
          Member
          • Dec 2017
          • 21
          • germany
          #3
          Re: Water Damege 820 - 01958A no Power on

          Originally posted by mon2
          Check and post the voltage reading of P5VG3S_EN_DLY

          The P5VG3S_EN_DLY signal is driven by U7610. Investigate that this circuit is operating correcting by reviewing the INPUT to U7610 (pin # 1).

          Be sure that R7613 is still present.

          U7610 single gate IC is being powered via pin # 5 ?

          Post your readings.
          Thanks for the help. But now I have a bigger problem. The PP3V3_G3H is also no longer there.

          I removed the mosfet Q7680. After that I measured the pins

          https://ibb.co/17RcpLq

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 13894
              • Canada
              #4
              Re: Water Damege 820 - 01958A no Power on

              Remove all power.

              Meter in resistance mode.

              Check the resistance to ground on the inductor L7690.

              Value ?

                Comment

                • macrepair
                  Member
                  • Dec 2017
                  • 21
                  • germany
                  #5
                  Re: Water Damege 820 - 01958A no Power on

                  Originally posted by mon2
                  Remove all power.

                  Meter in resistance mode.

                  Check the resistance to ground on the inductor L7690.

                  Value ?
                  What do you mean with "all Power"

                    Comment

                    • mon2
                      Badcaps Legend
                      • Dec 2019
                      • 13894
                      • Canada
                      #6
                      Re: Water Damege 820 - 01958A no Power on

                      What do you mean with "all Power"

                      No adapter.

                      No battery.

                      Then take the resistance measurements.

                        Comment

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