CPU Fan

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garry

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When I recently had to change my PSU I noticed that my CPU fan had seized. I have fitted a new fan however it does not kick in, consequently I am now using me pc without any covers on in a bid to keep it cool.
Can I check the supply to the fan? Or does it mean my motherboard is U/S.

Fujitsu PII 350hz
MS - 6119 motherboard
 
It does sound as if the supply volts for your fan on your motherboard have packed up. It's also likely in that case that your original fan is probably OK. Or both fans are knackered :D

Assuming your new fan is OK, you're going to have to power it from the main Power Supply. This means either getting a 3 pin to 4 pin Molex adaptor or cutting off the 3 pin plug and wiring it to an old Molex plug via a terminal block.

You need to come off the 12 volt supply, the 12V+ wire is usually yellow and any of the two middle black wires will be your 0V (minus).

If you have a voltmeter it's worth checking the volts before you connect, although you can't really go wrong. If you connect to the 5 volt rail, your fan will go slow, if you get the wires round the wrong way I believe the fan will just rotate the wrong way.

Not entirely sure on that last bit though :)
 
Uh oh

You risk "Frying" your CPU ...

If your fan is connected to the motherboard change it for a fan with four pin connector & connect to the PSU.

Maplins will have them.
 
Thanks for the advise, think i will try and get the adapter before i go chopping wires.
Cheers.
If i check the psu voltage using a multimeter can i do any damage if i connect the probes the wrong way round?
 
If i check the psu voltage using a multimeter can i do any damage if i connect the probes the wrong way round?
Click to expand...

Only to the volt meter. ;)
 
Originally posted by garry
If i check the psu voltage using a multimeter can i do any damage if i connect the probes the wrong way round?
Click to expand...

No.

If it's a digital voltmeter it'll just show as a negative voltage. If it's an analogue meter, such as an AVO8, the needle will just swing hard to the left and give you no reading but it won't harm the meter.
 
Thanks guys,

Telephoned the local pc repair shop for an adaptor and they wanted £5, telephoned Maplins and they had the lead for £1.99.

Lead fitted ok and fan kicked in straight away.

Thanks guys.
 
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