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. I checked ohms reading on the 5v coil it just fluctuates between 120K & so on, not a short. Some repair tips will be greatly appreciated. Thanks in advance
-
-
Power delivery is not at 20v so cd3215s must be reviewed. Test each LDO rail on the cd3215s.
https://logi.wiki/index.php/CD3215_Bootup_Sequence
-
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 -
Hello, I have this Macbook A2141. It stuck at 5V / 0,075A. I measured all 4 ports, all the same. PPBUS_G3H is present but only 12,3V. Should be 12,6V ? according to this article : https://repair.wiki/w/MacBook_Pro_A2...w_at_5V_repair
PP3v3_G3H_RTC_X is present - 3,3V
PP3v3_G3H_SOCPMU is present - 3,3V
What else should I check?
Thank you for your help. -
MacBook Pro 2019 A2141 820-01700 NAND Issue Stuck in DFU
Ok, here's an issue ive got on a A2141 820-01700 MBP 16' 2019. No signs of life, 5.06v 0.0a on usb-c meter, on each 4 usb-c ports.
Nand voltages are missing.
I've found no shorts at all so far, no signs of heat via thermal camera either.
PPBUS_G3H 12.31
PP3V3_G3H_RTC 3.387v
PP3V3_G3H 12.31v
PP2v5_NAND_SSD0 0v 58 ohms
PP2v5_NAND_SSD1 0v 57.8 ohms
PP1v8_SLPS2R 1.8v
PP1v1_SLPS2R 1.1v
P3V3_G3H_SOCPMU 3.37v
PP0V9_SLPDDR 0.9v... -
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... -
I have a customer that mailed me his a1932 (820-01521-A), all i know is that it is completely dead.
here are my measurements/observations
with battery/fan connected (connected to 65W charger):
top USBC port: 4.950V (starts at ~75ma, then settles at 30ma) note: sometimes this port has the same behavior as bottom port with battery connected (so 20v 0ma)
bottom USBC port: 20V (80ma for a split second then goes to zero)
without battery, fan is still connected:
top USBC port: 4.950V (starts at ~75ma, then settles at 30ma)...
Comment