Replacing a power supply's fan

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3hunna

3hunna

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First of all I know it voids your warranty but since my psu is not in warranty it doesn't matter & I also know that the psu's capacitors hold electricity even when turned off if I accidentally touch the capacitors it will give me a hazardous shock . My power supply's stock 140mm fan is making noise so I removed all the psu's connectors from my pc , then took it out & then opened it , disconnected the psu's fan , removed it sticker from underneath , puts 3 drops of machine oil put the sticker back on , spin the fan for a while & then put it back together but that didn't solve the problem so I guess the fan needs to be replaced I am thinking about replacing it with Xigmatek XSF-F1452 140MM Fan which is 700rs (7 dollars in US currency) but my question is the psu's fan header is 2 pin while the new fan will be 3 pin so can it directly be plugged into it? I did research on Google I saw a person using 3-pin to 2-pin adapter & while on Youtube saw 4 videos in 3 of the videos they cut the 2 pin connector off the old fan & cut the 3 pin off the new fan & soldered the 2 pin connector to the new fan but in the fourth video he directly plugged the 3 pin into the psu's 2 pin & it worked.


https://www.beegeek.net/xigmatek-xsf-f1452-140mm-fan/
 
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prouton

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The three wires on the new fan are for + voltage, ground (or common) and fan speed sense. The old, two wire fan does not have the speed sensor. The usual color coding for the wires is + voltage = red, ground = black, and speed sense = yellow. However, that's convention, not absolute.

If you can plug the new fan's connector into the old socket such that the red and black wires are connected (and the yellow wire extends off the side) then you shouldn't need to cut anything. However, some two wire sockets are box shaped and don't allow for a larger connector to be inserted. In that case, you would need to do some minor surgery on the wires.
 
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onichikun

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The yellow wire is a tachometer signal and is not needed. Just red (5v) and black (ground). You can solder it directly or use a 3-pin to two pin converter.

This is very dangerous tho. You don't even have to touch the filter cap to receive a hazarous shock. Whenever you work on a computers PSU, leave the PSU unconnected for 30 min to an hour before working on it.
 
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3hunna

3hunna

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The fan that I am getting is it a good one? & the yellow wire on it's fan connector is on the side here's a screenie http://prntscr.com/792oex so it should work if the 2 pin fan header got enough space for it to fit & by the way if I need to solder , I'll need to connect the black (ground) to the black wire & red (12v) to the red? & I'll need a heat shrink too?
 
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3hunna

3hunna

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What if I used gloves? & I also heard if you turn off the pc & press it's on button it also helps reducing the electricity , the incompetent technicians of my country don't even wait & use WD40 in the fan which isn't even a proper lubricant & is used for rusty things it will help for a while but the noise will comeback after a few days this is why I want to replace the fan at home but I'll get someone to assist me with it
 
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onichikun

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Rubber gloves are good, but I would still wait 30 minutes after unplugging it. There >should< be a bleed resistor across the Y cap to discharge it over time. It usually takes 7-8 minutes for a low wattage PSU to discharge, but better safe than sorry!

Red, by convention, means +5V. Yellow means +12V (when talking about power) but is the tachometer PWM signal in fans.

If it were me, I would solder it to the board using lead free solder + proper flux, then heat shrink the exposed leads.
 
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3hunna

3hunna

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So I did everything as you said & it works but now the issue is it's making this noise

http://vocaroo.com/i/s1g9evdhO9jg
 
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onichikun

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Sounds like the fan is not affixed properly to the chassis of the PSU, and is causing a rattle. If you have rubber washers adding them between the surface of the PSU and the Fan mount holes would probably help a lot. Make sure all your screws are tight.
 
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3hunna

3hunna

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Not sure what a rubber washer is but I think they're rubber that are inside the holes where the fan mounts are on the casing where screws of the fan go in my casing is Corsair Carbide 200R & it came with those I don't think it's the fan because when I bought it they tested it in front of me & it didn't made no noise over there & I took it to a Computer technician & got the fan replaced with new one via old 2 pin connector (soldering) & he ran the psu without the pc & it didn't made no noise but the noise is coming from the psu so do you think I should disconnect the fan & run the psu to confirm if it's the fan or something else inside the psu?
 
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onichikun

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That sound is 100% vibration noise. Even if the fan doesn't make the sound itself, there could be a vibrational mode (a frequency of vibration that is amplified) by the casing of the PSU. Other than the fan there should be nothing mechanical in your PSU, and the only sound you will hear from those components would be a high-pitched coil whine due to some bad power frequencies.

The only way to stop this is to dampen those vibrational models, by changing how the fan is mounted (insulating the fan from the metal casing the PSU by rubber washers, making sure the side of the fan is not resting against the PSU casing, etc. is all a good way to fix this.

If you are feeling a large amount of vibration from the PSU when it is in the computer case, this is a good indication that a vibration mode is your problem.
 
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