The schematic shows PWR_OK comes from a voltage divider attached to the 5VSB rail. Without the voltage divider working, the SIO thinks +5V is missing and cuts power.
With the schematic in hand, you have the power to fix what others throw away. Happy repairing. foxconn n15235 motherboard schematic
Let us walk through a real-world repair scenario using a hypothetical schematic. The schematic shows PWR_OK comes from a voltage
The Foxconn N15235 is notorious for poor-quality electrolytic capacitors in the voltage regulator module (VRM). The schematic tells you: foxconn n15235 motherboard schematic