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Power supply fan control partially failed. fan is only just turning so power supply overheats and then shuts down. otherwise power supply is ok.


Answers :

I guess u r a professional..as u r handling power supplies..
u point of view has always a priority, in such case u gotta replace the fan..

however, the problem of system shutting down suddenly has many more reasons too..check the following:

1) the smps itself may b defective/faulty..check the outputs of smps\015\012viz. 0v (black~ground); +12v (yellow); +5v (red, green~ps-on, violet~pg\015\012& grey~sb); -12v (blue); -5v(white); +3.3v(orange)..
the 'oscillator and error amplifier ic', or\015\012pwm switching regulator circuit..look for defective\015\012protector-transformer/resistance(esp 4.7k)/mosfet..

2) if\015\012itz not the smps, then it must b ur main/mother board..see with a debug\015\012card for mb error..may b short..look for defective capacitors(esp above\015\0121000mfd)/mosfets..go through the mb's south bridge n the circuit lie\015\012around atx connector....

3) remove/clean dust neatly..dust is non-uniform in nature n may cause jam/short circuitry/excess resistace n many more..resulting an increase in heat..

4) open the CPU Heat-Sink with fan out of the socket..put some "Heat Sink\015\012Compound" (available in local electronics chip level spare market)\015\012between the cpu/processor and the CPU Heat Sink *** fan..resit/fit it\015\012tightly in position..

5) see if the ram(s) is loose/faulty..open clean/remove carbon & or oxide formed on the teeth with an eraser n resit it..

..plz give higher priority to step2 (as listed above) CAREFULLY..

always better to seek advise from ur system admin/vendor....
\015\012Disconnect all devices from the power supply EXCEPT the motherboard
Remove any extra cards including video etc.(plug monitor into the onboard)

If you hear any beeps these can indictate where the fault is.
either of these sites below will help you further with that

Beep codes P

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