820-01958 not turning on. Only 5.25v on both USBC ports. PP1V1_S3 only 2.3Ω

[joshAU]

Hi all.
Looking at a 820-01958 board that was extensively water damaged.
After cleaning, I'm only getting 5v on both USBC ports.

With the AC adaptor connected to the primary (REAR) USBC port:
PP20V_USBC_T_VBUS 0.00v
PP20V_USBC_X_VBUS 5.25v
However,
With the AC adaptor connected to the secondary (FRONT) USBC port:
PP20V_USBC_T_VBUS 5.25v
PP20V_USBC_X_VBUS constantly fluctuating/cycling between 0.00v and about 0.50v

I would normally assume that the fluctuating voltage would indicate a short on PP20V_USBC_X_VBUS, however as it shows 5.25v on the other port, it cannot be shorted.
Would this indicate a problem with the Secondary USBC controller?

I also just noticed that PPDCIN_G3H also fluctuates from about 2.98v to 5.05v ONLY when connected to the secondary USBC port.

Checking coils, PP1V1_S3 also seems to be too low.
In diode mode, red to ground, it measures 008.
In resistance mode it measures 2.3Ω to ground.

Any suggestions appreciated, thank you.

 

[2informaticos]

1V1_S3 powers up the RAM and CPU.
CPU is the most sensitive there; probably dead now.

You have a problem on USB-C area too.
Anyway, not worth to spend time there, with dead CPU.

 

[joshAU]

1V1_S3 powers up the RAM and CPU.
CPU is the most sensitive there; probably dead now.

You have a problem on USB-C area too.
Anyway, not worth to spend time there, with dead CPU.

Thanks once again 2informaticos, I appreciate your advice.