Overclock.net › Forums › Components › Power Supplies › Power Supply Fan running at full speed all the time.
New Posts  All Forums:Forum Nav:

Power Supply Fan running at full speed all the time.

post #1 of 3
Thread Starter 
I built a computer about 8 months ago and have recently noticed that the PSU fan is running at a very high speed. This happens as soon as i turn the computer on but the outside tempreature is not very hot.

I am wondering if my PSU is not sufficient for my build. My build includes;

Corsair CX 500 PSU
MSI Z77a-g43 MOBO
GTX 660 GPU

I would appreciate any help with this problem.

Thanks
post #2 of 3
Quote:
Originally Posted by burns94 View Post

I built a computer about 8 months ago and have recently noticed that the PSU fan is running at a very high speed. This happens as soon as i turn the computer on but the outside tempreature is not very hot.

I am wondering if my PSU is not sufficient for my build. My build includes;

Corsair CX 500 PSU
MSI Z77a-g43 MOBO
GTX 660 GPU

I would appreciate any help with this problem.

Thanks

Which way is the PSU turned?

Also its not a uncommon problem with the CX to overheat when there is little air flow in the case

Also read this post if you like
http://www.overclock.net/t/1415677/whats-exactly-the-problem-with-corsairs-cx-psus#post_20542988
Edited by shilka - 8/4/13 at 3:32pm
Seravee
(24 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core I7 6850K Gigabyte X99 Ultra Gaming Gigabyte GTX 970 G1 Gaming Kingston HyperX DDR4 Savage 3000 MHz 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Evo WD Green WD30EZRX  WD Green WD40EZRX  WD Green WD60EZRX  
Hard DriveOptical DriveCoolingCooling
WD Red WD80EFZX 8TB  LG CH12NS30 5x Noctua NF-A14 FLX Noctua NH-D15 
OSMonitorKeyboardPower
Windows 7 64 Bit Asus PG279Q Corsair Gaming Strafe RGB EVGA SuperNova G2 750 watt 
CaseMouseMouse PadAudio
Phanteks Enthoo Luxe Roccat Kone XTD Laser Roccat Sense Metor Sennheiser HD 598 
AudioAudioOtherOther
Onkyo TX NR646  Harman Kardon HKTS 60 CableMod E series PSU cable set CableMod LED Strips 
  hide details  
Reply
Seravee
(24 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core I7 6850K Gigabyte X99 Ultra Gaming Gigabyte GTX 970 G1 Gaming Kingston HyperX DDR4 Savage 3000 MHz 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Evo WD Green WD30EZRX  WD Green WD40EZRX  WD Green WD60EZRX  
Hard DriveOptical DriveCoolingCooling
WD Red WD80EFZX 8TB  LG CH12NS30 5x Noctua NF-A14 FLX Noctua NH-D15 
OSMonitorKeyboardPower
Windows 7 64 Bit Asus PG279Q Corsair Gaming Strafe RGB EVGA SuperNova G2 750 watt 
CaseMouseMouse PadAudio
Phanteks Enthoo Luxe Roccat Kone XTD Laser Roccat Sense Metor Sennheiser HD 598 
AudioAudioOtherOther
Onkyo TX NR646  Harman Kardon HKTS 60 CableMod E series PSU cable set CableMod LED Strips 
  hide details  
Reply
post #3 of 3
How can poor air flow make the fan run fast right from the start? I don't think it can. OTOH here are some things I've seen:

1. The thermistor circuit has a short, most likely at the thermistor itself (leads touching) or where its cable is soldered to the fan controller.

2. The fan controller's output transistor could have failed and is shorted, causing full voltage to be applied to the fan all the time.

3. Bad soldering on the fan controller, not just a short but also a cracked connection, such as for the resistor that's used for comparing the thermistor's resistance.

4. Wrong voltage going to the fan controller. I don't know what they use, but I assume they run off the +5V or +12V.

5. I noticed that my CX430 runs its fan at high speed during the first fraction of a second after turn-on and then slows it to normal speed. That can be done with a capacitor connected across the thermistor, to help the fan start more reliably, and maybe that capacitor is shorted.
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Power Supplies
Overclock.net › Forums › Components › Power Supplies › Power Supply Fan running at full speed all the time.