PS5 fat EDM-033 No power. No beeps. Nothing

Nephew said it just didn’t turn on one day.

No beeps, nothing when I press the power button. PS is good. No shorts found, all fuses test good. All standby voltages are there. No shorts around the southbridge.

Tried to hook up UART, but it won’t connect. Draws 0.07 A from the bench power supply.

Not sure where to go with this one so looking for suggestions please. TIA

Should read drawing 7 mA

I would make NOR dump and check it.