Ps4 slim no power but eject beeps

The power button itself gives no reaction, only the eject button gives a beep.
Before you ask, it’s not the power brick.
I replaced the Southbridge with a brand new one to be faced with the same behavior.
Any one has a clue of what could be bad on this board?
I found there’s is a Small regulator in the like of the ps3 wifi power supply that used to prevent it from powering on. It was a 1.8v reg.
So there is one on the Ps4 board looking the same. Could someone tell his value?