A 15V or 18V zener diode across the VCC pin of the PWM IC can short. On the schematic, it is often labelled "ZD1."
A compact, robust power supply for hobby PCBs: wannien 101v0 power supply schematic free
Руководство по ремонту блока питания Antminer APW12 [EN] A 15V or 18V zener diode across the
If you are looking for the schematic to perform a repair, most failures on this board follow standard patterns for switch-mode power supplies (SMPS). JustAnswer No Power/Dead you have your own custom schematic.
Once you draw this, you have your own custom schematic.