PSU keeps blowing up

April 2, 2009 at 09:30:51
Specs: Windows Vista 64 Home premium
I built a computer about 18 months ago using the following components.

Corsair TX750w PSU
AMD Phenom Quad Core 2.2ghz
Gigabyte Motherboard GA-MA770-DS3
Nvidia 8800 GTS DDR3 640MB
4x 1GB Geil 800mhz DDR2 RAM
2x 250GB Western Digital Caviar (RAID 0)

The PC worked perfectly for about 10 months and then the 1st PSU blew up. I contacted Corsair in Holland and they sent me a replacement upon inspection of the PSU. I chose Corsair thinking that it is a quality company offering a 5 year warranty.
I installed the new PSU and the PC worked perfectly for another 6 months, and then it blew up again.

I am very confused about how this could happen as the PC was under hardly any stress, as I was only browsing the web.

Any advice would be greatly appreciated.

Also advice on some alternative PSU's ie the bargain win power PSU's which I will most probably be replacing it with.

Regards Sean

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April 2, 2009 at 09:39:41
The problem may lie with the power being supplied to the PSU. If the voltage is not within the range it should be or fluctuates, is interrupted, etc. Those things can ruin a good PSU.

If you are connecting to a circuit that has a high current usage appliance like a refrigerator on it then every time the frig starts the line voltage probably drops.

Are you using any devices in between the computer and the wall plug?

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April 2, 2009 at 09:52:27
As far as I am aware the there are no appliances connected to the same socket other than printer, monitor and network router.
There is also a belkin surge protector fitted.

Do you think that it could be a fault with the 220v mains wiring loom in the house?

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April 2, 2009 at 10:25:54
Do you use 220V or 115V for the computer?

To answer your question. If you have aluminum service entrance cable to the meter and from the meter to the distribution panel there MIGHT be a problem.

Aluminum wire for this purpose is fine if the equipment is rated for it and the proper paste was applied to the cables at the lugs.

If the paste wasn't used as was the case in the past then the cables can overheat and that causes the lugs to loosen. I am not trying to scare you but this condition is fairly common. The solution is for an electrician to apply the paste and then reseat the cables into the lugs.

None of the above may be your problem. Could be a power company is delivering dirty electricity. That is out of phase or wrong voltage.

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Related Solutions

April 2, 2009 at 10:31:31
"Do you think that it could be a fault with the 220v mains wiring loom in the house?"

Is it aluminum wiring, or copper?

The connection of the computer to the AC in the wall, and the connection of the wall socket MUST be grounded and wired properly.
There may be an led or leds on the belkin surge protector that indicates whether it is detecting a wiring fault and/or that that it's grounded properly.

A surge protector often will not be enough to protect against damage caused by a nearby ligtning strike or a lightning strike on the power grid near you. The only sure protection from that is to unplug everything that plugs into AC that plugs into your computer, AND the cable that connects you to the internet when there is lightning in your area - your computer doesn't have to be running, and whatever you have it plugged into can be switched off , yet the voltage spike or surge caused by the lightning can still get through because it's beyond what the surge protection device can handle, or if the voltage spike is a high enough voltage it can jump across switched off circuit connections.
Is it possible there was a lightning storm before the power supplies failed?

Don't buy an el-cheapo PS.
See response 3 in this:

I checked your mboard model and cpu. The Rev. 1.x mboard will handle up to 125 watt Phenoms, the Rev 2.x mboard up to 140 watt Phenoms, the cpu draws 95 watts, so the mboard can definately handle that (some older mboard models can't handle more than an 85watt Phenom).

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April 2, 2009 at 10:33:53
I'm a big fan of Corasir PSU's & recommend them regularly. But as is the case with many PSU brands, Corsair doesn't actually manufacture the PSU's they sell. This may come as a surprise to a lot of people, but Antec doesn't manufacture PSU's either. You can *usually* determine the true manufacturer by finding the UL Number on the label & then entering into the follwing site:

However, both Antec & Corsair purchased UL numbers so if you do a search, it will come up as either Antec or Corsair, not the true manufacturer. A bit sneaky if you ask me. But if you do some googling, you can usually get to the truth. The TX750W is made for Corsair by Channel Well & it's a quality unit.

Getting back on point, I also suspect the problem is with the power being supplied to the PSU, not with the PSU itself.

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April 2, 2009 at 10:40:10
The PC uses 220v AC 50hz as is the mains electrical current.

You say that it could need a higher amperage service cable.

I had a electric shower fitted a while ago and it needed a high amp independent wiring loom going direct from main fusebox to the shower.

Do you think that getting an electrician to install a new 30amp cable to a new wall outlet, will solve the problem?

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April 2, 2009 at 10:49:42
"If you have aluminum service entrance cable to the meter and from the meter to the distribution panel there MIGHT be a problem."

Our house has had overhead aluminum cables from the alley to the house since day one (1959) , and we also have aluminum overhead cables from the house to the garage (since about 1961, installed by a journeyman electrician), and have never had any problems with those.
However, for a few years in the 90's here aluminum wiring could be installed as the new wiring within the building as well, and THAT can certainly develop problems. The wiring within our house is entirely copper.

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April 2, 2009 at 11:52:51
I very much doubt if your ring main is causing a problem. You are in the UK, not a third world country.

If there was a problem with the ring main, then I would expect a circuit breaker or fuse to be blowing all the time.

It could be a mains spike from the supply from the road, but why is nothing else in the house blowing up. The surge protector should protect the pc.

A few years ago, I had a supply problem that blew up a portable phone psu & a clock radio. I contacted the electric company was was paid compensation. If you think the supply is faulty, make a claim, they will probably have record of mains fluctuations, if they have no records of a problem at that time, then its probably not the supply.

I would think there is a problem with something in the pc. I realise that the parts are new, but it could be something simple like a plug on the board not in fully.

Before posting try google. Backup. Use anti virus software.

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