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Noisy Fan On Cpu Heat Sink


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4 replies to this topic

#1 groegler

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Posted 18 April 2007 - 02:47 PM

When my fan an my three-year-old Dell 4600C started running at top speed from bootup, I decided the solution was to open the box and apply "canned air" to the heat sink fins. Even after removing about a cubic yard of dust bunnies, the fan continued to run constantly at top speed. Tracked down an OEM duplicate and replaced the fan. Still runs at top speed. Removed and replaced the heat sink (I know! I know! But one came with the new fan!!) both the new fan and the old fan still run at top speed. What am I missing?

The mini-tower sits unobstructed on a desk and I haven't added any heat-producing devices inside. (no new devices at all)

Isn't there supposed to be a sensor on the fan that tells it when to speed up and slow down? Does it need an adjustment with a ball peen hammer or something?

Thanks for any ideas you may have!

groegler

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#2 acklan

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Posted 19 April 2007 - 12:30 AM

Did you clean off and reapply a coat of thermal paste between the heatsink and the processor? That will cause a big spike in temperature if it is inadequate.
You could also run Everest v1.51 to see what your temperatures are running.
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#3 groegler

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Posted 19 April 2007 - 07:01 PM

Thermal paste. So that's what I got all over my hands! Thank you for your suggestion. I'll get some thermal paste, clean off both surfaces and re-apply.

Best regards,

Groegler

#4 garmanma

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Posted 19 April 2007 - 07:10 PM

Clean it off with rubbing alcohol. the mistake a lot of people make is using too much thermal compound. Use a small dab and spread it all around with a matchbook cover or a piece of cardboard. The fan is only going to be one speed unless the motherboard was designed for variable, don't know about Dell or you have 3rd party speed contol setup
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#5 mommabear

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Posted 20 April 2007 - 07:24 AM

One of those little plastic tabs, like you find on bread wrappers, is also good for spreading the compound.




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