Macbook Pro 15 A2141 820-01700-A stuck at 5V

[sdogs]

Happy Sunday everyone,
I have this Macbook Pro 15 A2141 820-01700-A stuck at 5V, it doesn't have any liquid marks or burn marks, I have carefully inspected the logic with the microscope and have not found any anomalies.
By connecting the usb-c tester I could see that it is blocked at 5v, and as a first measurement I checked PPBUS_G3H which has a voltage value of 0.8v and measured in 0.06 ohm diode mode.
I read a bit in the forum and I tried to inject 1v on the F7000 not having any current absorption, I then went up to 1.5v and I had a light current absorption (0.10Amp) and checking with the thermal camera I noticed that u6960 it seemed to be hotter.
I checked the voltage on all four usb-c ports with the tester and the values are identical 5V and a few milliamperes of absorption.
Any suggestions?

[mon2]

Re: Macbook Pro 15 A2141 820-01700-A stuck at 5V

Remove the fuses on PPBUS_G3H @ F7000 and F7001.

Power up again. Check the voltage to ground @ F7000, pin #1 = ISL side = producer side. What is the measurement?

Remove all power, meter in resistance mode. Check the resistance to ground on F7000, pin #2. What is the measurement?

[sdogs]

Re: Macbook Pro 15 A2141 820-01700-A stuck at 5V

the voltage to ground @ F7000, pin #1 = ISL side = 12,21v
the resistance to ground on F7000, pin #2 100 ohm

[sdogs]

Re: Macbook Pro 15 A2141 820-01700-A stuck at 5V

I found a U9080 isl on a donor a1989 logic board and tried to change it, unfortunately everything remained as before. I'm not sure if the ic I took from the other logic board is working but it's an attempt I made.

[sdogs]

Re: Macbook Pro 15 A2141 820-01700-A stuck at 5V

Remove the fuses on PPBUS_G3H @ F7000 and F7001.

Power up again. Check the voltage to ground @ F7000, pin #1 = ISL side = producer side. What is the measurement?

Remove all power, meter in resistance mode. Check the resistance to ground on F7000, pin #2. What is the measurement?

I made the measurements you indicated and I put the results, it seems to me a situation similar to other posts of similar problems of this logic board series..... I hope I have some hope ;-)
In relation to the small overheating of u6960, when I injected 1.5v, do you think it is appropriate to remove it to see if the short circuit goes away?