macbook air 2018 A1932 820-01521-A

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • 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
    Tags: None
    • 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
                  • 14070
                  • 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

                    Previous template Next

                    Related Topics

                    Collapse
                    • envym
                      MacBook Pro 2018 with Activation Lock
                      by envym
                      Hi everyone!

                      I have a 2018 MacBook Pro (with Sequoia OS) that I've been using for years with no problem. I recently received an M2 MacBook Pro so I'm mostly using it and not the 2018 one, but since a friend of mine needs a computer, I thought I could restore my 2018 and give it brand-new-like to my friend.

                      I tried using the built-in tool to restore the MacBook (Settings > General > Transfer or restore > Delete) but it got stuck when trying to remove the Find Device configuration (it asked me for the password for my old Apple ID -now I use the same account but...
                      06-27-2025, 08:54 AM
                    • Clarify4082
                      Macbook Air 2018 A1932 Bootloop
                      by Clarify4082
                      Hi,

                      I have a A1932 Macbook Air with Bootloop.

                      I already replaced the battery with a new one and reset NVRAM and SNC.
                      When I start the Macbook the Screen is coming on (no Logo) and switches of after a few seconds. If I start without the trackpad and keyboard it stays on longer.

                      If I use diagnostic (Option+D), recovery (Option+R) I always get the Apple logo and it go into online-Recovery. Even if I boot the installer from a USB-stick it ends up in online-recovery. Sometimes it crashed short after entering the wifi password, sometimes it loads the recovery...
                      01-07-2025, 09:41 AM
                    • bouch
                      unlock macbook air A1932 2019
                      by bouch
                      hi

                      i whant unlock macbook pro A1932 2019 whit ibridge 9,3 ;

                      i change efi files find on files mina T2 activator 1,4 and use for activation mina T2 activator 1,3 , but fault ssh?

                      i use mina T2 ramdisk activator 1,0 and 3,0 . but whon t work ?

                      have you other programme or method compatible whit this macbook ibridge 9,3 for bypass ?

                      I need help or information?

                      Does anyone have the minat2 activator 1.4 software?

                      Or did they use it for bypass macbook air 2019 a1932 with new ibridge 9.3?

                      Thank yo...
                      03-12-2025, 10:14 AM
                    • reessi
                      Macbook Air - 2018 - A1932 - 820-01521-02 - Bootlooping if Power Button Connected
                      by reessi
                      Hello,

                      With the power button connected it either boot loops with the apple logo or no display but the charging meter shows it looping on charging every few seconds.

                      No corrosion any where!

                      Tried a replacement power button off ebay and the same.

                      Very occasionally it will work with the power button connected!

                      Same results with or without the battery.

                      Can it be a fault with the Audio board or the mainboard?

                      The touch Id assembly connects through the Audio board first then to the Mainboard.

                      Flex...
                      06-26-2024, 03:31 PM
                    • sikocan
                      MacBook Air 2018 A1932 820-01521 Not turning on.
                      by sikocan
                      MODEL: MacBook Air 2018 A1932 820-01521

                      Problem: 5.12V / 0.60Amps

                      History: Unknown but I can see slight liquid spill on IC U8201/74aup1t97gm

                      Things tried: I've cleaned the liquid area, removed the IC U8201/check pads, good/ chip looks good, put back. Replaced CD3215C x 2 times, so 4 new chips just in case. I've attached photo readings of V/resistance and signals as per logi wiki website. Please advise what I can check next. Schematics available upon request....
                      08-05-2022, 06:47 AM
                    • Loading...
                    • No more items.
                    Working...