reformatt
thx a lot for your advice to look for the PCH.
I have a pretty similar but not the correct boardview and schematic. Only for the previous moldels with the seperated CPU/PCH. So I didn't notice.

Anyway, the relevant rail shows a low resistance but not zero. When I inject 1V into this 3V3 rail the PCH Chip on the CPU heats up...not very much but if I injected the actual 3v3 it would definitely get hot. Ain't gonna try tho.
In this case no repair possible Maybe I can find a working mainboard online or the same model with a broken screen......

this would be a no fix since it's a one chip BGA solution, PCH and CPU....

I changed the EC today. Shorts are gone in this area. Apparently it's working or at least it tried because the USB3.1 controller overheated. There was definitely no power before.
This computer got here because of an short at or close to the USB-A Port....

thanks for your answer.
I will give it a try then. I removed the EC today and the shorts are gone.
What I'm concerned about is that two CPU coils show a very low resistance to gnd. I know cpu rails can be low but 0.7ohms on this isn't very much....

Hello,

I located a defective EC (IT557VG-128)on a MS-16R81 2.0 board of a MSI Thin GF63 12U. The board doesn't have any voltages except the 19V power line.
Some Caps and resistors around the EC show less than 2 ohms. One of them is a 3V rail. When I inject 1V@1A the EC heats up.
I'm pretty sure I can't just buy and replace it since it probably needs the correct firmware on it.
Does anyone of you guys know?...