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:
>>>>> https://www.badcaps.net/index.php?pageid=donate1 <<<<<
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 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.... -
Hey....
Board as written in description was stuck at VGA LED. common Problem wit these type of bords.... tried all the "standard stuff" like resettin... reseatin.... found out the LED Controller MCU1 = IT8295FN-56A geting burning hot under the last PCI Slot.. now i desoldered it cause there were only 18 ohms at the caps arround.... another aorus x470 in working condition with similar part and nearly same layout had arround 280 ohms...
my question is: why doesnt the board start know without this chip.... worked myself through the boardview but i can´t understand...
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