820-00281 - Missing pp1v8_sus - 20v .01a draw

[bls951]

820-00281 with 20v 0.01a

Macbook with liquid damage around u7650. That chip was changed and the components around it changed. There was also some liquid on the C7839 area as well.

Currently missing pp1v8_sus. PP3V3_S5, PP3V3_SUS, PM_SLP_SUS_L, PP3V3_PMICLDO and PP5V_PMICLDO are all there, but no output on L8020.
I have also checked R8020/21/25 and they are within spec and their traces are good. XW8021/21 bridges are good too.

I have replaced the PMIC and PCH with the same exact results. Looks for any help here. Thanks.

 

[2informaticos]

1V8_SUS has the same enable signal as 3V3_SUS (PM_SLP_SUS_L).
Check first diode mode to ground at L8020; as all other coils.

You didn't say anything about 1V_SUS.
It should be present, as its enable signal is the power good from 3V3_SUS.

 

[bls951]

Thanks for the help. I was able to figure it out.

The issue was a broken trace for PP5V_PMICLDO near C8021 at a test pad. So I fixed that trace so it had continuity with C8016. It wasn't noticeable and wasn't something I suspected since it was a spot where there wasn't any liquid and me having that voltage at the PMIC.

Thanks again for your help. It was something I should have known so my apologies for wasting your time.