820-01041-A With liquid damage It does not turn on

[1phone.cl]

Hello

I got a Macbook Pro with liquid damage in the sectors
L9021
C9081
C9593
C9592
The damage is only on the edges of the motherboard
I did a cleaning but the Mac does not turn on, this is the first time that I work with this motherboard and I am lost, I do not know where to start

 

[2informaticos]

Check diode mode to ground at L9020/30/80.

 

[1phone.cl]

L9020 0.156V
L9030 0.325V
L9080 0.318V

 

[2informaticos]

Post exact voltage for PPBUS_G3H and 3V3_G3H_RTC.

 

[1phone.cl]

PPBUS_G3H 12.62V
3V3_G3H_RTC 3.383V

 

[2informaticos]

It is recognized in DFU?
If not, check if all AWAKE and SLPS2R voltages come on and steady.

 

[1phone.cl]

Yes, it recognizes it in DFU, I tried to restore the system but it gives me an error.

 

[2informaticos]

Seems to have problems with its SSD.
Do you get voltage on SSD coils?

 

[1phone.cl]

Yes i have voltage in all the ssd coils

 

[2informaticos]

The error is SSD related.
Probably corrosion already damaged SSD.

 

[1phone.cl]

what can i do in this case?

 

[2informaticos]

Not to much, if SSD got damaged.
Did you try both DFU revive and restore?

 

[1phone.cl]

yes a tried to restore with another T2 Mac and apple configurator but I got an error, the one I sent you in the photo.

I had to remove some caps that had corrosion damage
C9592
C9593
C9081
and I haven´t put them back because I do not have these cap at this time
Do you think the failure could be related to that?

 

[2informaticos]

The mentioned caps shouldn't be related; all of them are filter caps.

Do you get correct voltage on SSD coils?

 

[1phone.cl]

yes i have the correct voltage on SSD coils, some of them have a little of damage corrosion, but it is only on the top not at the base where they are soldered.

 

[2informaticos]

Then I can only suspect SSD area.
Possibly overvoltage caused by initial corrosion.

 

[1phone.cl]

There is some possibility of discarding by taking memories, this mac has 6 memories and I have a good reballing technique, so just tell me what I have to do and I do it.

 

[2informaticos]

I recommend to check first all the resistors from SSD area.
One corroded resistor is enough to block the communication.
Check the basic signals of U9000.

 

[1phone.cl]

ok, I already checked the resistances related to ssd and they are all good, I tried again to restore and now it gave me another error
How can I check the basic signals of the U9000?

 

[2informaticos]

You should follow a power on seuquence for T2 boards.
We have 01598 and 01055 already posted on the forum.

820-01598 Power On Sequence.pdf

drive.google.com

820-01055 Power On Sequence.pdf

drive.google.com

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