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Swapped PSU fan... Problems now!

post #1 of 13
Thread Starter 
Hi everyone,

My PSU fan was rattling very loud lately so I decided so swap it out for a Fractal Design 140mm Silent Series fan. Now the problem is that when I switch the computer on, the fan doesn't spin up. The stock fan was glued to a 2 pin header, so I cut the wires on it and soldered the new fan onto it, also putting heat shrink on each wire to cover the exposed wire cores.

Does anyone know what the problem could be? The fan worked before being soldered, and it's not one of the power supplies that only uses its fan when it had to, the old fan used to spin constantly.

Cheers guys!
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post #2 of 13
Just a quick question but you've soldered the correct fan wires?
Or maybe the PSU doesn't deliver the correct voltage / amperage?

Can't think of an other reason why it shouldn't work.
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post #3 of 13
The original fan was chosen to work well with the fan controller in the PSU and it sounds like the new fan won't spin up because the voltage is too low. Fans have a minimum voltage, fans used in PSUs usually have very low starting voltages so they can be silent at low loads. What was the old fan?
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post #4 of 13
Thread Starter 
Yeah, I'm sure I soldered the correct wires tongue.gif

I'm not sure what the old fan was... It doesn't have any labels or branding on it... However, the new one does begin to spin after I gently push it with a screwdriver! Could it be a voltage issue then?
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post #5 of 13
Jip, the fan that you put in has a to high starting voltage.
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post #6 of 13
Thread Starter 
It can have a too high starting voltage? blinksmiley.gif I thought it could only be too low?
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post #7 of 13
Normally a fan has a operating voltage of 5-12v but a fan in a psu can operate from 2-12v (*I may be wrong with my numbers*). Now in your case you most likely installed a fan that starts at say 5v but the psu wants it so start at say 3v.

Side note
If a fan is already spinning it is possible to keep it spinning with a voltage lower than it's starting voltage (when you start it with a screwdriver and it keeps going).

Hope this clears things up somewhat.
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post #8 of 13
Quote:
Originally Posted by stu1011 View Post

It can have a too high starting voltage? blinksmiley.gif I thought it could only be too low?
He means your new fan has a starting voltage that is too high, thus the PSU's starting voltage is too low.

Edit: Rosco's got it.
post #9 of 13
Thread Starter 
Ohhh... I get it now! smile.gif

So, could any of you guys recommend a good replacement fan that would start at that voltage? And be silent enough? tongue.gif
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post #10 of 13
I found an 140 mm fan roundup over at Xbit Labs where they test the startup voltages of some fans.

Maybe this could help you chose a fan that might work. (Scroll down a bit to find the graph)
http://www.xbitlabs.com/articles/coolers/display/140mm-fan-roundup_12.html

I myself have no idea of the voltage the PSU might deliver, probably somewhere under 5 volts, on the fan wires . Maybe it's an idea to measure this?
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