Voltage switch

March 25, 2011 at 03:26:40
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voltage switched when pc was Off power supply was on the pwer supply is 220 and i switched it at 110 what to do


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#1
March 25, 2011 at 04:27:43
Please clarify. Supply voltage is what (US 110V, Euro 220V)?
Moving switch to 220V and using it on 110V supply (US), especially if moved when power was off, will probably have no permanent effect since you would get a low voltage at the outputs and you would just not be able to boot.
The opposite, where you used 110V setting on 220V supply (Euro) will send higher voltages out of the transformer and into the filtering circuits and probably cause damage to the power supply. The two things that are not clear is whether there is a cut out circuit that could have protected the power supply, and whether any higher voltages got through to computer components (really bad).
At this point, you can remove the power supply, look up the correct voltages at each connector and use a voltage meter to see if it is working correctly. If it is, try it in the machine to see if there is damage there (or borrow another power supply to test it). You could however, take the risk of just trying the power supply, assuming that any damage is probably already done, but that would be your call.

You have to be a little bit crazy to keep you from going insane.


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#2
March 25, 2011 at 06:59:06
did u hear explosion sound? If u didn't hear or smell anything then switch to correct voltage and start the system.

We can not fight new wars with old weapons, let he who desires peace prepare for war - PROPHET.


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#3
March 26, 2011 at 06:00:20
Well thx all
I knew later that my power supply box fired up so i just had to change it thx all by the way

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#4
March 26, 2011 at 13:29:24
"The opposite, where you used 110V setting on 220V supply (Euro) will send higher voltages out of the transformer and into the filtering circuits and probably cause damage to the power supply".

I don't believe the above statement is correct. If your local voltage is 220VAC and you set the PSU selector to 110VAC what will happen is you will send double the normal voltage to the motherboard and other hardware. Most likely this will damage the motherboard and other hardware.



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#5
March 26, 2011 at 22:04:57
"The opposite (of the statement before),....."
is actually the same thing you just said, you did not read the comma.

You have to be a little bit crazy to keep you from going insane.


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#6
March 27, 2011 at 09:39:25
Fingers

I think I understand what you were stating. My disagreement is with damaging the PSU. From all the threads I have encountered over the years I can't recall any where the PSU was damaged. I suppose if the PSU were on a bench and it was forced to run that way for any period of time it might overheat and damage the transformer windings.

What usually happens is that the motherboard is immediately damaged. Sometimes other hardware too.

We both agree that setting at 110V when 220V is required is not a good thing to do. Damage will most likely result.


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#7
March 27, 2011 at 20:24:08
Absolutely. I was thinking more about the filtering circuits which might last seconds as opposed to the MB's microseconds. The core's windings might last minutes, but they would go much more dramatically as the insulation burned away. Though mine is more from theory and observing other electronics, transformers, radio control models (electric and gas), and a florescent fixture's ballast that shot flames and black smoke out the sides of the fixture (pretty dramatic) over many years, rather than these UL listed power supplies (required fused links/cut-outs). I agree completely that any higher voltage getting through would fry the motherboard immediately at the very least, I am just not as clear on the design whether the voltage regulating circuits would act as a cut-out before anything got out. There you have the experience since it is the first time I have actually heard of anyone doing this (or at least admitting it) though every time I see the selector I cringe and take a double take at the number it shows, just to be sure.

You have to be a little bit crazy to keep you from going insane.


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