Sorry I forgot something, apparently I'm not allowed to edit my previous post ...
When 20V rail worked, I realized the high side mosfet for battery was very hot, so I removed the coil (still hot mosfet) and then removed the mosfet, and left it there. I considered it's not the main issue ... But maybe there is a link ...

Thank you again...

Hello everyone, I'm new here this is my first post, so hi and thanks for all that crazy work you're doing ! I'm also VERY new and VERY beginner on motherboard repair (that's my first ...).

Context: That laptop is my housemates, and it stopped working after water spilled on.

What I already did : open laptop, remove battery and basically everything, check voltage, 0V on 20V rail ... So I figured a short to ground, tried to inject 0,9V without a thermal camera with no success. I borrowed one and found one tantalum capacitor heating up in the CPU VRM sector, removed it, and...