Xbox one s totaly dead

I have a xbox one s with looks perfeclty good - apart of termal paste being solid as a rock.
Dosn’t power on, power supply is 100% ok, same as front board, wifi board (everything was swaped with a different xbox one s).
I checked for short on 12v rail - I don’t see any short there.
Checked mosfets near apu - dont look like any of them is faulty.

Front board need a little push to plug in, but looks like it has a connection.
Any ideas?