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Power Supply failures

By jdclyde ·
Have several computers in our training room. They have all been off for a few months as there has been no training requested. I went in there today to prepair for a session on Monday, and of the four systems I planned on using, two had burned up power supplies.

When I opened them, the fuse looked good, but the board was burnt in two places.

What would cause two power supplies out of a room of nine to burn up, all on the same source, all turned off?

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by j.lupo In reply to Power Supply failures

There are a lot of things that can cause it. I would check the others out just to be sure there is no damage to them inside.

If there have been strong electrical storms in the area, it can go along the lines and fry your power supplies that way. A surge or spike could have gotten through.

The important thing is to check all the others for any hint of damage. I would also check all other electrical connections in case it was due to lightening or something. I have seen an entire network taken out by an electrical storm. I have also seen this same situation happen where some are killed and others were fine.

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by jdclyde In reply to

Thanks, just seems odd is all.

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by JamesRL In reply to Power Supply failures

J.Lupo has it - bad power one way or another.

When the power goes off, it often spikes when it comes back on. You can of course check the others with a multi meter to be sure.

Even when the PCs are turned off, the PS is active - thank the wake on Lan function.

It also happens in building with bad wiring - suddent load changes. This is more common than lightning strikes.

Very few fuses would react quickly enough to stop a spike -they are deisgned to stop a sustained overload, and a spike can be much faster. You can get decent power bars that may help. A UPS generally filters out spikes very well.

As to why two of nine? Could have been the first two on the circuit, or could just be fluky - older power supplies are more susceptable.


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by jdclyde In reply to

as these computers have not been turned on in months, it is impossible to say about lightning.

These are new lines that are suppose to be issolated.

The plan is to unplug the room in between sessions.


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by jdclyde In reply to Power Supply failures

More detail after looking into this more.

First there are two issolated circuits that run this room. One was on one circuit, one was on the other.

The systems are six years old, celeron 400's. good enough for using for training.

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by jdclyde In reply to Power Supply failures

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