Hi everyone,
A H235P-00 power supply unit from a Dell Optiplex 760 PC is faulty.
After removing it from the computer, I placed a paper clip between the green and black wires, then connected it unloaded to the mains through a series lamp.
➡️ First test:
The PSU partially works: the green indicator LED lights up, and the fan starts for one second, then stops.
A click can be heard at the moment it stops. The series lamp lights up when the power supply starts, then turns off when it shuts down.
I then followed the advice from the forum and replaced the bulging capacitors after measuring their capacitance (those that measured correctly were not replaced):
➡️ Second test:
On restarting, the green LED no longer lights up, and the fan doesn’t spin.
The series lamp lights up for less than a second, then goes out.
A whining noise can be heard for about five seconds, and then it stops completely.
Thank you for taking an interest in my topic
A H235P-00 power supply unit from a Dell Optiplex 760 PC is faulty.
After removing it from the computer, I placed a paper clip between the green and black wires, then connected it unloaded to the mains through a series lamp.
➡️ First test:
The PSU partially works: the green indicator LED lights up, and the fan starts for one second, then stops.
A click can be heard at the moment it stops. The series lamp lights up when the power supply starts, then turns off when it shuts down.
I then followed the advice from the forum and replaced the bulging capacitors after measuring their capacitance (those that measured correctly were not replaced):
- C60: 2200 µF / 10 V (rated) → 1190 µF (measured)
- C119: 2200 µF / 10 V (rated) → 568 µF (measured)
- C818: 100 µF / 25 V (rated) → 51 µF (measured)
➡️ Second test:
On restarting, the green LED no longer lights up, and the fan doesn’t spin.
The series lamp lights up for less than a second, then goes out.
A whining noise can be heard for about five seconds, and then it stops completely.
Thank you for taking an interest in my topic
