Hello! I'm attempting to repair 820-02100 after liquid damage. There were several affected areas: UT000, U5700, UF750 and their surrounding capacitors and resistors, UR600 audio ic, several capacitors on the backside of U8100 (namely C80A3, C80A0, C8060, C8061, C8103). After thorough cleaning of the board, I started measuring around the affected areas and found PPVIN_P3V8AON and PPVOUT_KBDLED_CONN shorted. I replaced UT000 and U5700 and like 20 more components on PPVIN_P3V8AON line for good measure until every last corroded component and the short went away. After that I tried powering on (naked on the table, only the type c cable connected) and am getting stable 5V 0.38A-0.40A. Before proceeding I decided to deal with the rest of the affected areas - replaced UF750, removed UR600, replaced mentioned capacitors on the backside of U8100. Result is the same. I started measuring again for shorts. Turns out, P1V8VDDH is shorted. Some voltages:
PMU_VDDHI 0.6V
3V8_AON 3.15V
PPBUS_AON 3.14V
P3V8AON_SW2 1.53V
PP1V2_S2 0.15V
As far as I understand, normally I would inject 1V into P1V8VDDH and see what's heating up on a thermal camera, but I currently don't have access to one. Is there any advice in my situation, maybe there's a common IC that dies in this case and I can just replace it? Thank you in advance!
PMU_VDDHI 0.6V
3V8_AON 3.15V
PPBUS_AON 3.14V
P3V8AON_SW2 1.53V
PP1V2_S2 0.15V
As far as I understand, normally I would inject 1V into P1V8VDDH and see what's heating up on a thermal camera, but I currently don't have access to one. Is there any advice in my situation, maybe there's a common IC that dies in this case and I can just replace it? Thank you in advance!
