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POWER SUPPLY UNIT

Whenever I switch on my PC after sitting idle for long hours without any electric current passing through it or connected to my power outlet, most of the time it doesn't turn on immediately. I had to wait for a few a minutes while the voltage regulator is turned on. After that I switch off & on again my voltage regulator and only by that time my PC starts to operate. I suspect that it could be my 230 - 300 Volts PSU but it might be also the voltage regulator. Can someone help with with this dillema?

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  • Anonymous Apr 28, 2008

    After powering I have to wait for ten minutes before it comes on. The two green lights are lighting inside the mother board. Suspect a capacitor!!

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A voltmeter would be helpful here. If the proper voltage is being supplied to your computer power supply, then the computer power supply itself is defective. You could use the voltmeter to verify this, or just merely bypass the regulator- plug the computer directly into wall current, assuming here your wall current isn't terribly out of tolerance, or terribly dirty - spikes, sags etc.

I have seen several computer power supplies which are slow to come on. The problem is often electrolytic capacitors in the power supply circuitry - probably in the standby +5 volt supply (this powers a tiny part of the circuitry on the motherboard). The voltmeter could be used to check this out also.

If this is the problem, it will likely get worse, to the point where it won't power up at all. Whether you want to replace the capacitors, or just swap out the p.s. is up to you. If the p.s. is a high quality unit, repairs might be suggestable, especially if you have some technical skills.

Posted on Nov 07, 2007

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Hi, you can almost bet anything that your voltage regulator is at fault. It sounds as if this needs time to build enough resistence to reach the 240 volts required by your computer's PSU.
Change this unit and you should cure your problem.
Question, Why do you need to use a voltage regulator?
Are you running on home generator power?
If you run on mains regulated power then replace the voltage regulator with a power surge protection board.
Regards mistyman

Posted on Nov 07, 2007

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