A2251 No power/ Stuck in DFU

[tommy97]

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.

[mon2]

What is the exact voltage to ground of PPBUS_G3H? PP2v5_NAND_SSD_0 ?

[mon2]

The error code -1 indicates that the device is unable to communicate with the Apple server.

Check your internet connection - use a reliable USB to Ethernet port adapter (with Asix controller is recommended).

[tommy97]

PP2v5_NAND_SSD_0 2.5V
PPBUS_G3H 12.59V

"The error code -1 indicates that the device is unable to communicate with the Apple server." - got an Ethernet adapter, DFU seems to go through, now it shows me that screen, no changes, tried update through DFU and it says that action cannot be done.

[tommy97]

Any idea what to check further? mon2

[mon2]

Review the last 2 posts here and keep updating this thread:

https://forums.macrumors.com/threads...dlock.2293187/