820-01949 Stuck at 5V

[CGid]

Macbook A2251 came in for liquid damage.

After inspecting the board there was noticeable corrosion on the motherboard around the battery connector area.

Board was ultrasonic cleaned.

After cleaning a short was found on PPBUS_G3H. Injecting voltage showed U7600 was shorted. Replaced from a donor board and the short is cleared.
System still stuck at 5V pulling 0.002-0.007A.

PPBUS_G3H voltage - 0.616V

Checked ISL chip and ISL is not getting any voltages to it.
Found that R7020 and a few components around it needed swapped. Swapped components. Now have 1.054V on PPBUS_G3H. I get 5V going to ISL (pictured here with voltage readings

https://imgur.com/a/wPAnOKe

)

Does ISL need replaced too? I checked at R6907 for Voltage and get nothing.

 

[2informaticos]

Do you really expect that someone else identify the lines in the picture and translate to schematic?
Please, post usefull information, when need help.

Remove F7000 and check C7050 voltage.

 

[CGid]

Sorry, didn't think that was a big ask when it comes to board help but will make sure to change that when posting in the future.

@ C7050 with the Fuse removed I get a cycling voltage from ~2V down to 0.9V then back up to 2. Would say it's a 2-3 second cycle.

 

[2informaticos]

Keep te fuse removed, until solve U7000 problems.
Post U7000's basic voltages: P_IN, AUX_DET, SMC_RST_IN, VDDA/P, EN_MVR, A/BMON.
Check resistance (ohm scale), over C7020/23.

 

[CGid]

U7000:
P_IN - 5.087V
AUX_DET - 1.263V
SMC_RST_IN - 0V
VDDA - 5.062V
VDDP - (-0.069V)? Black probe was on ground but still got negative symbol.
EN_MVR- 0V
AMON - 0V
BMON - Starts @ 0.893V, drops to 0V within a second or two. Repeats.

C7020 - 493.6 kOhms
C7023 - 2.3 Ohms