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Can you reset a pc power supply - Computers & Internet

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Is your question referring to resetting a Power Supply, as you would per se a surge protector?

In most cases No.
Most Power Supply's do not use a Circuit Breaker, nor a Fuse.
(May have to take that statement back, on some of the new Power Supply's though)

Once the Power Supply has gone bad, (Weak Voltage power rail, usually), it's time to buy a new one.

I find that Electrolytic Capacitors have failed, in most failed Power Supply's. However, that is just my general observation over the past 20 years.

Low quality Electrolytic Capacitors are used.
(Radial Aluminum Electrolytic Capacitor's)

These capacitors are used as Filters for the Power Supply. They filter the incoming AC electricity, and the outgoing DC electricity the Power Supply has converted.
(Input Stage, and Output Stage)

To wit:

The Power Supply used in a personal computer is an SMPS.
Switched-Mode Power Supply,

http://en.wikipedia.org/wiki/Switched-mode_power_supply

Here on the above Wikipedia page for SMPS, you will see a photo to the top right, of a typical SMPS.
You can click on the photo to enlarge.
(You can enlarge twice)

You are looking at a top view of a typical SMPS, that has the cover removed.
The large Electrolytic Capacitors, indicated by the letter B, are for the Input Stage.
The smaller Electrolytic Capacitors, indicated by the letter E, are for the Output Stage.

NEVER open a Power Supply, (SMPS), and try to work on it.

Even when a capacitor is removed from power, (Power Supply unplugged from power), the capacitors hold a charge for a LONG time.
Weeks, Months, sometimes over a year!

If your fingers touch the terminals on the bottom of a capacitor, (Radial Aluminum Electrolytic Capacitor), the charge could be released to YOU!

If your fingers complete a circuit that one, or more capacitors are in, the charge could be released to YOU!

The released charge can be a BAD shock to FATAL!

There are also MOSFET's, and Rectifier Bridge's that can go bad in an SMPS.

There is a Proper way to discharge a capacitor. I will not detail it here because of the safety issue to you.
The best method is to replace the Power Supply.

Tell me the computer manufacturer name, and Model Number, and I will look up what Power Supply it uses, if the info is available.
(90 percent of the time it is)

For any questions please post in a Comment.
Regards,
joecoolvette

Posted on Sep 13, 2010

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