New CPU fan not working
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Posted by momx5 on January 31, 2007, 6:48 am
Please log in for more thread options "CPU fan has failed" and it shut back down. Today I bought a new fan, and installed it. It still does not work! :crybaby: My husband took the old fan and hooked it to a battery and it worked just fine, it just won't work in the computer. Someone please tell me what is making the fan not work...I work from home and can't function without my computer. | |||||||||||||
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Posted by Paul on January 31, 2007, 9:52 am
Please log in for more thread options OK, this cable is what you want. As far as I can tell, there are two cable assemblies in this package, which is hard to see in the picture. http://www.newegg.com/Product/CustratingReview.asp?item=N82E16812105007 http://images10.newegg.com/NeweggImage/productimage/12-105-007-01.JPG That cable consists of three connectors. A female fan header, a male fan header, and a four pin Molex disk drive connector. The cable draws power for the fan, from a disk drive cable. So if the motherboard header power source is burned out, that cable can bypass the power problem, and allow the fan to run. The female fan connector has the RPM wire on it. When you plug in the female connector, to the CPU fan header, that is how the motherboard will get the RPM signal that tells it the fan is spinning. So that still has to be plugged in. This is essentially what the cable does. Molex 1x4 Male 3 pin (plug fan into this) 12V --------------------------------------- Fan +12V GND -------------------------------+------- GND GND --X | +---- RPM 5V --X | | | | | +---- RPM +------- GND X-- Fan +12V Female 3 pin (plugs to CPU_FAN motherboard header) In the above figure, I rearranged the pins on the fan connectors, to make it easier to see the wires. The fan pinout is *not* as shown above. Check the motherboard manual, to see the actual order of the fan pins. Second note, I drew the wire assembly, as I see it in the Newegg picture. In fact, the GND wire running between fan headers is not needed. I have one cable assembly like the above, that has a single white wire running to the female connector. Third note, there are other versions of this assembly available. There is one that has two Molex 1x4 connectors on the left hand side of the picture. That one allows these adapters to be "stacked" or "daisy chained" so you don't lose the use of the Molex drive connector. If the computer in question is low on Molex drive connectors (say the computer is a Dell/HP/Gateway, and there happen to be no spares), you can buy a "Y" cable for disk drive connectors, and that will give a second connector for use with the above cable. http://www.newegg.com/Product/Product.asp?Item=N82E16812119008 http://images10.newegg.com/NeweggImage/productimage/12-119-008-01.JPG So the purpose of the above fan adapter cable assembly, is to: 1) Power the fan from a disk drive connector. 2) Feed the RPM signal to the CPU_FAN header. 3) To be used, if the power dies on the CPU_FAN header. 4) Or can be used, if a fan draws more current than the fan header can provide. For huge fans drawing 1 amp, an adapter like this will protect the fan header from burnout. HTH, Paul | |||||||||||||
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Posted by kony on January 31, 2007, 10:24 am
Please log in for more thread options On Wed, 31 Jan 2007 11:48:12 -0000, no@spam.invalid (momx5)
wrote: >When I booted up my computer the other day, I got the message
>"CPU fan has failed" and it shut back down. Today I bought a >new fan, and installed it. It still does not work! :crybaby: My >husband took the old fan and hooked it to a battery and it worked just >fine, it just won't work in the computer. Someone please tell me what >is making the fan not work...I work from home and can't function >without my computer. It means the fan RPM signal was too low (Or not read). The fan might work but spin too slow now due to a progressive failure of the bearing. Similarly, the new fan might also spin too slow to be detected properly- some motherboards can't properly detect very low RPM fans, OR it could be that the replacement fan does n't have an RPM signal output (3 wires going to the fan header on the motherboard). It might be possible to enter the bios and turn off that shutdown-on-failed-fan setting, though ideally you'll supply us with more info about which of the above possibilities seems probable, or if none of them, other related info to help determine the cause. | |||||||||||||
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> "CPU fan has failed" and it shut back down. Today I bought a
> new fan, and installed it. It still does not work! :crybaby: My
> husband took the old fan and hooked it to a battery and it worked just
> fine, it just won't work in the computer. Someone please tell me what
> is making the fan not work...I work from home and can't function
> without my computer.
>