macbook air 2018 A1932 820-01521-A

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  • madjid911
    Badcaps Veteran
    • Dec 2016
    • 387
    • France

    #1

    macbook air 2018 A1932 820-01521-A

    Hi,
    I have a macbook air 2018 A1932 820-01521-A, with water damage on 7650, I changed U7650 U3100 AND U3200,
    no start, T2 warms up slightly, but no shorts, I noticed PP3V3_G3H is low and does not release the PP1V8_G3S which feeds the bt rom
    do you have any advice to help me? thank you

    LOW TENSION :
    PP3V3_G3H 3V22 > P1V8G3S_EN 0V > P1V8G3S_SS > 0V > PP1V8_G3S 0V
    PPBUS_G3H 12V26

    other voltage:
    PPDCIN_G3H 5V
    PP5V_G3S 5V
    PPBUS_G3H 12V26
    PP3V3_G3S 0V
    PP1V8_G3S 0V
    PP3V3_G3H_RTC 3V27
    pp1V8_SLPS2R 1V79
    PPVBAT_G3H_FUSE 0V20
    CHGR_VBAT 0V20
    PPBUS_HS_CPU 12V28
    PPVIN_G3H_P5VG3S 12V28
    PP5V_S5_LDO 0V
    CHGR_BGATE 12V28
    U3100:
    PP1V1_UPC_XA_LDO_BMC C3104 0V
    PP1V8_UPC_XA_LDOD C3105 1V79
    PP1V8_UPC_XA_LDOA C3106 1V80
    PP3V3_UPC_XA_LDO C3108 3V3
    PP3V3_TBT_X_SX R2864 3V26
    PP20V_USBC_XA_VBUS F3000 5V
    U3200:
    PP1V1_UPC_XB_LDO_BMC C3204 0V
    PP1V8_UPC_XB_LDOD C3205 1V79
    PP1V8_UPC_XB_LDOA C3206 1V79
    PP3V3_UPC_XB_LDO C3208 3V3
    PP3V3_TBT_X_SX R2864 0V 3V26
    PP20V_USBC_XB_VBUS F3010 5V
  • curiositymaster
    Member
    • Apr 2021
    • 45
    • Nigeria

    #2
    Re: macbook air 2018 A1932 820-01521-A

    Have you been able to fix this issue?
    Last edited by SMDFlea; 07-30-2021, 10:07 AM. Reason: Pruned full OP quote

    Comment

    • madjid911
      Badcaps Veteran
      • Dec 2016
      • 387
      • France

      #3
      Re: macbook air 2018 A1932 820-01521-A

      Originally posted by curiositymaster
      Have you been able to fix this issue?
      hi
      i still haven't solved the problem, the macbook is not recognized in dfu mode, can someone help me? thank you

      Comment

      • cruiser_
        Senior Member
        • Nov 2019
        • 124
        • Ireland

        #4
        Re: macbook air 2018 A1932 820-01521-A

        I have similar readings, although my device is recognized in DFU. That low PP3V3_G3H and PPBUS_G3H are puzzling me :|

        Comment

        • mon2
          Badcaps Legend
          • Dec 2019
          • 14051
          • Canada

          #5
          Re: macbook air 2018 A1932 820-01521-A

          What is the value you have for PPBUS_G3H ?

          If it is not a normal voltage, remove the fuse on this rail to isolate the PRODUCER (ISL buck-boost regulator) & CONSUMER (downstream / load) sides.

          Then power up again and check the value of PPBUS_G3H before the fuse.

          Is the value now normal ? If yes, then consumer side is a suspect. Remove all power -> meter in resistance mode -> check the resistance to ground AFTER the fuse to see if there could be a shorted cap.

          Comment

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