820-00165 liquid damage around SMC 0.02A died after UC

[it-solve]

Seems all the drama happened around the SMC


Corroded track on R5193/R5117/R5177/R5100 replaced and rewired broken joints
U3710 had a bad track to SMC_OOB line, rewired that

After all this was repaired, it turned on and seemed ok, so I ran it over Ultrasonic Cleaner, then 0.02A and dead. maybe a cold joint occurred, so I went and reballed the SMC thinking it might have corroded underneath. But no liquid residue underneath.

Checked the continuity on all these corroded tracks. I am missing something, but not sure what. What is the best way to approach it?

 

[2informaticos]

Don't use ultrasonic cleaner, when the corrosion is located on a small area.

Now check basic signals and voltages from power on sequence.
What is exact PPBUS_G3H voltage (without battery)?

 

[it-solve]

Just tried this morning and it turned on, I will test furthermore.

I have UC'd only the SMC area, just to make sure corrosion is not underneath.
Thanks again,