[Repair] Replace the fan of the ATX power supply for the personal computer

There was a strange noise coming out of the ATX power supply fan
Replace with a 4PIN PWM fan
ATX power supply: ENERMAX EES500AWT 500W
PC fan used: ED122512M-PD DC12V 0.40A 12cm
0:00 Power supply fan noise
0:28 Take out the power fan
1:08 Fan replacement
3:31 Operation check
4:09 Disassemble the broken power fan
4:47 Power supply fan board circuit
5:09 Role of COM terminal
5:47 Disassembly of PC fan
6:18 Reconnect the wiring
7:03 Rotation signal and COM voltage measurement
7:55 Frequency of rotation signal
8:29 PWM operation check
9:06 Fan wiring and assembly