macbook pro a2251 820-01949-a 5v stuck i checked all ldo ok ppbus_g3h is 12v pp3v3_g3h 3.3v all SLPS2R volt ok i try in dfu but gave me this error 4042
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which ic
u means u3750 icComment
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Hi everyone,
I need help with a bin backup of the SOC ROM (u4770) of an A2251 2020 board 820-01949
thanksComment
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Due to a lack of donations, server free space at a critical level, and possible closure of Bios Requests all donations are welcome, click:
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Every donation made will go towards server fees and maintenance costs.Comment
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Hi Dear friend., I am working MacBook Pro A2251 Logic board 820-01949-A. The history was that there was slight liquid on the LHS CD3217 & was not powering on at all. No 20v or any amps. I replaced with known good CD3217s & then got the power but its stuck on 5V .18amp. I did power measurements which are below:
PPBUS_G3H=12v
PP3V3_G3H=3.3v
PP3V3_UPC_X_LDO=3.3v
PPDCIN_G3H=5v ????
PP1V8_SLPS2R=1.8v
Do you think the other RHS CD3217 have to be replaced to as they might have gone defective???? -
Hi everyone, I have this unit A2251 820-01949.
I receive this unit with a shorted PP3V3_G3H and found the culprit C8161 shorted and I remove it but the unit still stuck at 5v 0.04A
This are the readings I got on the unit
PPBUS_G3H -12.33v
PP1V8_SLPS2R -0v
PP3V3_G3H_PMU_VDDMAIN/PP3V3_G3H - 0v
P1V8G3S_EN from u7800 - 0v
U3100_W
PPHV_INT_G3H_W - 5v
PP1.5_UPC_LDO_CORE_W - 1.5
PP3V3_UPC_W_LDO - 3.3V
PP3V3_G3H_RTC - 3.3V
U3100_R
PP1.5_UPC_LDO_CORE_R - 1.5
PP3V3_UPC_R_LDO - 3.3
PP3V3_G3H_RTC... -
Hi guys i've got an Hp laptop Zbook 17 g5 Stuck on Hp protected by hp sure start screen.
I have tried almost every bios available on various platforms about this laptop but the problem is still the same.
I even successfully build my own bios using the one from the Hp website but the problem the laptop still getting stuck there.
Even if i try to press Esc key nothing happens. I tried f10 it doesn't go to bios still stuck there i just saw entering setup menu on the bottom left corner of the
screen that's it and stuck there. I left it until the following day and i still...09-02-2025, 01:51 PM -
Hi all,
Would appreciate your input, we have fixed a water damage motherboard for the a2251, there was mainly corrosion next to the 2 locations, but were able to clean it all
First few times- the Macbook would boot and got to login screen (didn't try to login), day after, when we tested it - it would get stuck on the logo and won't show welcome screen
What would be the best step to take from here to test? should I test Mobo components/ chip / storage? and if so- where do I start?
OR should I try to use the Apple Configurator and connect...05-17-2023, 11:40 PM -
Hi,
i'm having a problem with A2251 after the liquid damage, before it got to us, customer went to other repair store, and we don't know what was done. Laptop stucked on 20V 0amp, i tried to revive bridgeOS no luck, error -1.
PP3v3_S5 - Normal
PPBus - Normal for DFU
PP2v5_NAND_SSD_0 - normal (and resistance about 45Ohm)
Liquid damage was mainly next to ISL from that what i've noticed....
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