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Windows 7: Psu 12v 5v touched


07 Dec 2010   #1

Windows 7 Ultimate 64 bit
 
 
Psu 12v 5v touched

Hi guys,
Over the weekend a did a case fan mod on my CM690. I installed a terminal block to eliminate some molex connectors.

I got this idea from TJ Harlow, as seen on youtube.

At one stage my PC was running and the 5v and 12v wire on the molex touched.

This caused the pc to switch of instantly. All I did was to plug everything out, in again and started up and everything id running fine. Should I be worried that I caused some serious, permanent damage to the PSU?

PS: It's a Corsair TX750w PSU.

Thanks guys.


My System SpecsSystem Spec
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07 Dec 2010   #2

Windows 8.1 Pro RTM x64
 
 

It sounds as though you have been extremely lucky. As you may know, the PSU provides several different power rails at different voltages to supply the hardware and components in your system. The +5V and +3.3V rails supply much of the logic circuitry, whereas the +12V rail supplies power to the various motors (fans, HDDs, optical drives) and the voltage regulator for the CPU. An accidental short between the +12V rail and either of the other two rails can cause severe damage to your system, even if the short circuit is of a very brief nature.

As I said, you have been very fortunate that the system shutdown instantly and that no apparent damage was caused, although I would definitely not recommend repeating just in case this was a fluke. That said, I would keep an eye on your system for the next few days or so to see whether you get any problems (including BSODs) that could be attributable to this episode.
My System SpecsSystem Spec
07 Dec 2010   #3

Windows 7 Ultimate 64 bit
 
 

Tnx for the reply.
I will definitly not repeat this stupid mistake, anyway my modding days are done for the time being.

The power supply has a build in safety function :
"Over Current/Voltage/Power Protection, Under Voltage Protection, and Short Circuit Protection provide maximum safety to your critical system components. "
link : Welcome to Corsair :: TX Power Supply Product Information

Can it be that this saved my hardware?
My System SpecsSystem Spec
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07 Dec 2010   #4

Windows 8.1 Pro RTM x64
 
 

Quite possible, although it is still possible that you have caused some damage to your motherboard given that some components may have been subjected to a voltage that is over double the normal level (12V versus 5V), even if only for a split second. As I said previously, you need to monitor your system for any signs of abnormal behaviour.
My System SpecsSystem Spec
07 Dec 2010   #5

Windows 7 Ultimate 64 bit
 
 

Thanks Dwarf, i'll do that.

Tnx again for your input.
My System SpecsSystem Spec
07 Dec 2010   #6

Microsoft Community Contributor Award Recipient

Windows 7 Ultimate 64
 
 

stomper I think you dodged a bullet.
My System SpecsSystem Spec
07 Dec 2010   #7

Windows 8.1 Pro RTM x64
 
 

You're welcome, stomper.
My System SpecsSystem Spec
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 Psu 12v 5v touched




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