PS4 CUH-1006A no beep, no power, power supply ok, no short circuit?

So I’ve got that PS4 Original CUH-1006A with SAA-001.

Console suddenly stopped working. First there was no beep from the power button but eject button would give us a beep. Then the proper owner of the console swapped power supply and had no beep at all.

From what I see both power supplies are good and rather no damage caused by replacing it. Visually no signs of any damage. I’ve checked for the shorts none found, voltages more or less seem to be fine, 4.8V present, fuses intact, checked for resistance as well. Seems like something responsible for turning the 12V line is simply malfunctioning.
Any idea what could it be?