The input stage consists of some common mode chokes and reverse protection diodes then an ADM1270 input protection controller driving an AO4447A high side PFET.

The gate drive of the ADM1270 is pegged at 19V (Vin) so the FET isn't turning on.

The output does not appear shorted at DC (about 6.5K ohms to ground on my meter).

None of the MOSFET pins are shorted to each other and all show plausible protection diode leakage resistances.

I already replaced the ADM1270.