a1932 - macbook air 2019 - 820-01521-a

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • rediii
    h???, spurrrn
    • Mar 2018
    • 487
    • somewhere in europe

    #1

    a1932 - macbook air 2019 - 820-01521-a

    the notebook had liquid damage. i cleaned everything. the damage included the typical spot on the right audio port, but no short on the ppbus_g3h. there was also corrosion on the pmc. the notebook only worked (both before and after cleaning) in safe mode. in verbose mode the device shows that it can't load the igpu firmware and then crashes/restarts with kernel panic. the measurements are unremarkable, all rails are there. in safe mode the devices that can be controlled work fine. i wonder if anyone has had this problem . maybe the liquid damage is just coincidence, because the cpu tends to fail on these devices...

    12.6 V at ppbus_g3h, while bat is not connected
    5.12 V to pp5v_g3s
    3.3 V at pp3v3_g3h
    Core voltages are normal

    maybe this is a t2 issue and can be solved with restoring the device in dfu mode?
    Last edited by rediii; 11-13-2022, 05:16 AM.
  • rediii
    h???, spurrrn
    • Mar 2018
    • 487
    • somewhere in europe

    #2
    Re: a1932 - macbook air 2019 - 820-01521-a

    okay, nvm. it was a firmware bug regarding the new monterey update... the liquid damage had nothing to do with it.

    Comment

    Related Topics

    Collapse

    • 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
    • mferna14
      820-01521-A (MacBook Air A1932 2019) stuck on 5V
      by mferna14
      Hi all dear friend., today I am working on 820-01521-A logic board (MacBook Air A1932 2019) stuck on 5V .19 milliamps. The history of this logic board was liquid spill on major components. First gave a good cleanup & both CD3215C00Z were getting very hot, so I replaced both. Now on the 12V coil, there is only 5v present & 3.3V is perfect. In some area like PPVIN_G3H_P3V3G3HRTC , PPBUS_G3H_TPAD etc., 12V is perfect. On the 5v coil .2 volts only. I checked the enable signal on the regulator chip, enable is NOT present. The logic board is very clean, I do not see any signs of spill anymore....
      03-27-2025, 04:52 PM
    • Bogbog
      Macbook Air 2019 A1932 / 820-01521-A No power
      by Bogbog
      Hello,

      I recently acquired a faulty Macbook Air 2019 A1932 with mainboard 820-01521-A.

      Seller claimed that device just stopped working suddenly.

      Device does not boot or give any signal of life other than the white led on mainboard.
      Using cheap multimeter and microscope I went trough list of semi-random diagnostic steps:

      Voltage measurements

      Charger in USBC-B (closer to display) everything disconnected.

      PP20V_USBC_XB_VBUS 20.7v
      PP3V3_UPC_XB_LDO 3.25v
      PP1V8_UPC_XB_LDOA 1.81V
      PP1V8_UPC_XB_LDOD 1.80V...
      02-26-2024, 05:04 AM
    • mon2
      A1466 Macbook Air (Liquid damage repair)
      by mon2
      Hi. Recently serviced a damaged A1466 Macbook Air. Thought to post the issues and resolution for each.

      Macbook AIR Model A1466 Diagnostic 09-01-2021

      Issue: Liquid damaged (beer spill) Macbook AIR will not power up.


      Problems & Resolutions

      1) Attached Apple magsafe power adapter. No green / no orange light. This confirms the absence of the PP3V42_G3H voltage rail. The PP3V42_G3H rail is the primary voltage rail necessary to communicate with the magsafe power adapter to report the green or orange light status to the end user....
      09-01-2021, 09:31 AM
    • TOMÁŠ
      MacBook Air A1932
      by TOMÁŠ
      Hi, I've never worked with a MacBook before, so I need some advice.
      I have a MacBook Air A1932 (820-01521). When I plugged in the charger with an amp meter, it showed 19.7V and 1.9A, which indicates that it's charging, but when I press the power button, it doesn't turn on. So, I disassembled it, disconnected the battery, and plugged in the charger again. It showed 19.6V and 0.04A, and pressing the power button had no effect—no current draw at all. Then, I removed the motherboard, connected the charger again, and got the same results. I took a multimeter and checked all the coils, and everything...
      05-20-2025, 11:19 AM
    • Loading...
    • No more items.
    Working...