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Removing fan from old hotwired PSU (Used for powering fans)

post #1 of 10
Thread Starter 
I want to know if it's safe to remove the fan from an old PSU that I hotwired (green cable to ground). I use it to power fans for various things like my PS3, Xbox etc... The problem is that the fan in it is VERY LOUD and it kinda beats the purpose of having it if it's louder then the fans I power, so I want to know if it's safe to remove the fan from it?
I don't THINK it should have overheating problems since all it's doing is powering maybe a couple fans max (not connected to PC), but I want to make sure. I guess it doesn't produce much heat since it doesn't have to power anything else then the +12V rail?

The PSU is 400W and I measured that it consumes 8W when powering the fans (including the one in the PSU itself)

So basically, can I remove the fan from the PSU or will it overheat?

Thanks
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post #2 of 10
You have it power a quiet fan to cool its self. Just remove the old one and attach a nice to the outside...tape it on if you need to. or just leave the old fan and unplug/cut the wires so that if you did ever want to use it as a regualr PSU you could do so easiliy. The PSU will not need that much airflow

it would still get pretty warm with no fan. it would probably be OK, but don't expect it to last too long. A year or two if you are lucky
Edited by Vagrant Storm - 8/22/11 at 12:50pm
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post #3 of 10
You can, I'd recommend swapping it out if possible.
All you need is a screwdriver, scissors/cutters and some electrical insulating tape, and some care.

Pop off the lid, cut the fan cables, remove old junk fan, install new quiet fan, tape wires and done.
Just don't touch anything inside the PSU other than the fan cable, there are some dangerous voltages in there.
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post #4 of 10
Thread Starter 
So it would heat up as normal even tho it's powering just a couple fans?
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post #5 of 10
Quote:
Originally Posted by markothevrba View Post
So it would heat up as normal even tho it's powering just a couple fans?
Not as normal...but it would still produce heat. If you don't remove the heat it will build up. If you never run it for more than a hour it might not ever heat up that much

I tried this once on a PSU I used to leak test with a very long time ago. It would so loud it was nuts, but I didn't have a fan that fit inside it and wasn't worth it to buy one. So first I just uplugged the wires to it. i came by to do my ussual check for leaks and the case of the PSU was almost hot enough to give me a mild burn...uncomfortable to the touch anyway. The PSU would have been supplying about 70watts of power I figure.
Edited by Vagrant Storm - 8/22/11 at 1:04pm
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post #6 of 10
Thread Starter 
The problem is that it's the old type PSU where it has a tiny (60mm?) fan at the back, so the fan is much noisier than the 120mm fans. I was thinking I could cut the PSU and put a 120mm fan on top like the better PSU's have, but it's an awfull lot of work for what I need it for imo :/
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post #7 of 10
Just cut the wires to the old fan and put a 120mm on top of it. Power it off a molex
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post #8 of 10
Thread Starter 
What if I just leave the PSU open? I really don't need another fan to make noise... I am kind off a silent freak
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post #9 of 10
Particularly if it's an old model, efficiency is probably absolutely terrible (like 50%? worse? who knows) at those kinds of very low loads.

I wouldn't worry at all about just removing the fan though. No need for a replacement. You measured like 8W? Even if the PSU needed to get rid of all 8W as heat (it doesn't since some of the power is being used by the fans it's powering), that's definitely fine without a dedicated PSU fan. Maybe your 8W measurement isn't that accurate in reality, but still, something like 15W is fine on passive cooling.

The power supply still has all of the +5V, +3.3V, and so on rectifiers working and all the other components powered btw, even if nothing is connected to them. That's where some of the losses are coming from.
Edited by mikeaj - 8/22/11 at 1:40pm
post #10 of 10
Thread Starter 
So I should be fine? It's not that I am concerned about the PSU AT ALL, screw that old piece of crap
It's just that I am worried that it might cause damage to anything... you know what I mean? I don't want it to catch fire or anything
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