PSU Fan Trouble, considering replacing the fan, help?

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haz991

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Mar 26, 2015
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Hi everyone

Im having some trouble with a new Corsair CX430 PSU. The fan makes a terrible vibration sound, that gradually gets louder and louder, and then suddenly stops, then this repeats. This only seems to happen when the PSU is mounted with the fan on the bottom.

I am considering opening up the PSU and changing the fan because its driving me crazy, and mounting the PSU the other way up is not an option. The current noisy fan inside the PSU is a Yate Loon D12SH-12. The replacement fan I have in mind is the one that comes with the Cooler Master 212 Evo CPU Fan, which I have a spare one lying around.

PSU fans have just a 2 wire connection for positive and negative power. I have heard that when you replace a PSU fan, sometimes the new fan will be forced to run at full power, as apparently some PSU fans are speed controlled by the fan not by the PSU. But the Yate Loon fan in my PSU is very cheap and I cant imagine it would have an onboard speed controller? Im hoping the speed controlling is done by the PSU, so that the replacement fan wont be at full power the whole time.

Anyone know anything about this? Thanks for help.
 
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First of all, if this is a new PSU with a faulty fan, you should be talking to the supplier or the manufacturer about replacement under warranty. If you open the PSU you will void the warranty.

However, if you do go ahead with fan replacement, most PSU's I have seen use common case ventilation fans - typically 80, 90, or 120 mm - so finding one to fit is easy. I'm quite sure that the fan's speed control is by voltage adjustment, so a common case 3-pin fan (not 4-pin) is suitable. As far as I know, PSU's that do control of their own internal fans do so by a control function on the PSU's board. There is NO fan that has its own built-in temp control, and no PSU I've seen will rely on the mobo to do such control. So when you connect the...
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Paperdoc

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First of all, if this is a new PSU with a faulty fan, you should be talking to the supplier or the manufacturer about replacement under warranty. If you open the PSU you will void the warranty.

However, if you do go ahead with fan replacement, most PSU's I have seen use common case ventilation fans - typically 80, 90, or 120 mm - so finding one to fit is easy. I'm quite sure that the fan's speed control is by voltage adjustment, so a common case 3-pin fan (not 4-pin) is suitable. As far as I know, PSU's that do control of their own internal fans do so by a control function on the PSU's board. There is NO fan that has its own built-in temp control, and no PSU I've seen will rely on the mobo to do such control. So when you connect the replacement fan to the PSU board, you just need to connect the two power leads to the board: Red is + on Pin #2, Black is - on Pin #1. Do NOT connect the fan's yellow lead (on Pin #3 of the fan's connector) to anything. Just snip it off and tape up its end. When mounting the fan, check the arrows on its case. Most have two. One points along the fan axis to indicate air flow direction when the fan is connected properly to + and -. The other points around the fan to indicate fan turning direction. Once you've got it all done, be sure to check that air flow is in the correct direction, just in case you got the lead polarity on the board backwards.
 
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