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PSU constantly running at max speed - Page 2

post #11 of 15
I'd guess a faulty temperature/fan speed sensor in the PSU.
Black Noise
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Black Noise
(22 items)
 
  
CPUMotherboardGraphicsGraphics
i7 990X Asus Rampage III Extreme Asus GTX TITAN Asus GTX TITAN 
RAMHard DriveHard DriveHard Drive
24GB Corsair Dominator GT PC3-16000 SanDisk Ultra II Crucial M4 Seagate Momentus 2TB 
Hard DriveOptical DriveCoolingCooling
Seagate Momentus 2TB Sony Optiarc AD-7690H Slimline DVD-RW Blocks - EK Supremacy, 3 x EK FC-580GTX, EK FC-... Radiators - 2 x Black Ice SR1 480, 2 x Black Ic... 
CoolingCoolingCoolingOS
Pumps - Swiftech 35X2 x 2 & Heatsinks Reservoir - EK Multioption X2 400 Advanced Fans - 20 x Noiseblocker PL2 Windows 7 Pro 64-bit 
MonitorKeyboardPowerCase
NEC MultiSync LCD2690WUXi Enermax Aurora Seasonic Platinum 1000 Case Labs TH10 & Pedestal 
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post #12 of 15
Are you sure the noise is the PSU fan? Did you disconnect the CPU cooler's fans and pump for a few seconds to make sure?
post #13 of 15
Thread Starter 
No but I have often set it minimum which makes part of the sound disappear. Besides the sound of the gentle typhoon is fairly distinctive. Though I will give it a try later anyway.
post #14 of 15
The temperature sensor (thermistor) looks almost like an open circuit when cold, almost like a short when hot. So a regular short in its wiring can make the fan controller think the thermistor is hot. Maybe some bare wires going to it are touching where it's soldered, either at the thermistor or at the fan controller. Don't check this except with the AC power cord disconnected; it's not safe enough to just turn off the switch. Another possibility is that the fan controller has a shorted output transistor, causing it to feed the full 12V to the fan at all times.
post #15 of 15
Thread Starter 
After actually taking apart the PC I think I was wrong and the actual source of the noise wasn't the PSU but rather the Gentle Typhoon on the radiator. Or at least one of them. The reason I thought it wasn't the Gentle Typhoon was that the sound level definitely went down when lowering the CPU fan speed, but the noise was still there which now in hindsight makes me think that one fan is faulty.
After taking it apart and putting my ear right next to the PSU there was no doubt that the Be Quiet! PSU wasn't exaggerating.

In any case I'll do some more testing and send back whichever fan is faulty.
I appreciate all the advice even though in the end it was a bit meaningless.
Edited by P4riah - 9/23/13 at 5:18pm
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