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Psu Humming

bwachtel
By bwachtel
in Power Supplies
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So I have a Corsair hx750. The fan berrings were going out and it's 6 months out of warranty. I pulled the housing off, cut the cable, and soldered it onto a noctua fan. Then put it all back together. At startup, the fan spins for a half second then stops (hx psu's only spin fan when required). So I pull up pc mark to draw as much current as I can to heat up the psu. When it gets to the point I would expect the fan to start turning, the fan doesn't move and there is a humming sound?

 

I'm confused as to what's going on? Any ideas? 

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The fan isn't jammed because it spins for a half sec at startup with no issue.

 

The only wiring I touched was the fan cable. 

 

The external wiring is the same as before I messed with the fan. 

 

The last part is the psu runs perfectly fine up until I would say when the fan is supposed to kick on. 

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Well, did you replace it with a fan that met the same specs?  Im assuming it wasnt soldered (original fan) to the board, but a 2 pin connector maybe?

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So it appears that the existing fan states 0.5a while the noctua states 0.13a max?  I guess that could be my problem without knowing how much power the psu sends to the fan. 

 

Haven't found the existing fans, fan speed. Can't see how that would effect a humming noise though. 

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5 minutes ago, bwachtel said:

So it appears that the existing fan states 0.5a while the noctua states 0.13a max?  I guess that could be my problem without knowing how much power the psu sends to the fan. 

I would be more concerned about you swapping out a 2400 RPM fan with high static pressure for presumably an NF-A14, a 1500RPM fan, which is also not designed for use in PSUs...

 

The fan not spinning could be due to a difference in how the fan RPM varies with voltage

:)

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4 minutes ago, Caroline said:

forget the spec, is there any resistor in the wire the old fan used? if a portion of the wire is thicker and covered in shrink then there's a resistor on it, you'll have to remove that in order to make the new fan move.

That's not how it works, if the PSU can supply let's say up to 1A then you could wire anything that uses from 0.01A to 1A.

There was no resister in the fan cable. From the photo I posted, that's the portion of the conductors that I did not use. I used the entire portion I had cut off. 

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The fan was an existing case fan (1 month ish old) that I used. So it was working before I had done the fan swap. The fan does spin correctly for a half second during system start up but then stops and is idel till Temps rise. 

 

I can try plugging the fan into the mobo now that it is modded and see how it works. 

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1 hour ago, bwachtel said:

So I have a Corsair hx750. The fan berrings were going out and it's 6 months out of warranty. I pulled the housing off, cut the cable, and soldered it onto a noctua fan. Then put it all back together. At startup, the fan spins for a half second then stops (hx psu's only spin fan when required). So I pull up pc mark to draw as much current as I can to heat up the psu. When it gets to the point I would expect the fan to start turning, the fan doesn't move and there is a humming sound?

 

I'm confused as to what's going on? Any ideas? 

Yeah.  You done messed up.

 

You should get a fan that's made to cool a PSU with appropriate static pressure.  Not a low RPM case fan.

 

You may have even been better off peeling the label off the hub, popping the seal and applying new oil.

 

Though, I have to ask how old the PSU is. Looks pretty old.  My general rule of thumb is if the PSU is out of warranty and the fan dies (which is usually the first thing to die), then more critical components will start to fail soon after.  And when PSUs fail, they can often take other parts out with them.

 

47 minutes ago, bwachtel said:

Do you have a recomendation for a 2 pin 2400rpm quiet fan? I can search but I didn't know if you had a go to. I just went with the noctua because a lot of people from videos I watched utualized noctuas.

Yeah... well... not everyone with a YouTube channel knows what they're doing.  It's often the blind leading the blind, I've found.

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