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Solve : faulty PSU?

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If the PSU has gone faulty, would the led's on the front of the base unit still light, would there still be power to the hard drive and would the fan still work?The PSU will be outputting 3.3v, 5v, and 12v supplies ........ so a fault or loss in any one of those could lead to problems. 

Right now I forget LED and fan supply voltages but - it certainly could be possible to see those as functional even when a voltage rail has gone down.The lead labelled power switch has no power from the connectors on the main circuit board, the power led is ok. The hard drive has power to it. But the pc does not boot at all, only the fan powers up.
It is a e-machine 370. Does anyone know if there is an in line FUSE SITUATED on the main board. Quote

The lead labelled power switch has no power from the connectors on the main circuit board

how did you test that is has no power?

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only the fan powers up.

which fan? the CPU fan or a case fan?

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Does anyone know if there is an in line fuse situated on the main board.

there is no in-line fuse on the motherboard.

when you push the power BUTTON on the computer, describe, in detail, what happens. does your harddrive(s) spin up? do your optical drives light up? do you hear any beeps?nothing happens at all when switch is operated. no hard drive no lights except the switch led.and the fans thats all ..i have checked with a meter and there is no live to the switch..

Maybe u mean that the CPU has power( power LEDS on, Chassis fan and CPU cooling fan are spinning) but not SENDING signal to the monitor....

Quote from: phil on September 10, 2008, 02:29:36 PM
If the PSU has gone faulty, would the led's on the front of the base unit still light, would there still be power to the hard drive and would the fan still work?

Yes.........

Did you checked its output voltages?

Red wire = 5v DC
Yellow wire = 12v DC
Orange wire = 3.3v DC
Black wire = Ground


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