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Dead CPU fan - Can You ID this part?

whiteoutage

Jul 20, 2017
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When I apply 9 volts to fan I get nothing. What looks like a green LED seams to have possibly blown (has an open circuit) ? Anyone know what this component is and could it be the problem? Fan spins freely by hand though it is very old and maybe could use some oil. There appears to be a circuit board under the cover -maybe to control fan speed.
 

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73's de Edd

Aug 21, 2015
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Thats a thermal sensor, sampling air over fan temperature and telling the internal motor control circitry when to kick into HIGH speed . . . . . and accordingly . . . when it can drop back down to normal speed.
Also you may need near a full 12VDC on that fan for it to kick off..

73's de Edd

If I made wine out of raisins . . . would I have to wait for it to age ?
 
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whiteoutage

Jul 20, 2017
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Doesn't work with 12 volts either. Also tried shorting the thermal sensor while applying voltages -still no love. Looks like more than one issue on the circuit board - I take it that this thermal sensor should not be open like it is? Also wondering where I can source a comparable sensor cheaply?
 

Bluejets

Oct 5, 2014
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Pretty hefty fan at 0.85A.
Are you sure your power supply is up to the task..??
 

73's de Edd

Aug 21, 2015
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I take it that this thermal sensor should not be open like it is?
I have seen some sensors actually being 100K ohms resistance . . . . . so that one might be in the same catagory . . . but you would be able to see the resistance shift as heated with a blow drier.
 

whiteoutage

Jul 20, 2017
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Just to follow up, replacement is the solution. The board can not be remove AFAIK -the serrated bushing is press fit to the board in flimsy plastic making it nearly impossible to remove (possibly heating/softening encasing plastic then pulling it after de-soldering 3 stater leads -forget it!). Failure was a component, three legged variety, that got fried along with aforementioned sensor. Exact replacement on eBay for $9 did the business.
 
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