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Thread: computer help. laptop & CPU cooling fan dont like each other anymore

  
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    Unhappy computer help. laptop & CPU cooling fan dont like each other anymore

    I was pi55ing about with a laptop and unplugged the CPU cooling fan electrical connector, and removed the heatsink/fan assy, then I refitted it and plugged it back in and turned the laptop on. the fan didnt work any more.

    i put a multimeter on the pin-outs - and it gives 5v as soon as the laptop is turned on.
    (so that's ok)

    i put 5v across the fan, and it works fine.
    (so that's ok)

    but if I plug the fan onto the pins, and poke the multimeter probes in, it only measures 0.9v and the fan doesnt spin.

    I'm not sure if I need a lesson in electronics or computers, but if anyone has any advice it would be appreciated.

    cheers

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    12vMatt's Avatar
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    did it used to run all the time or only when you were doing something processor intensive?

    it might just be its not hot enough for the fan to need to be on
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    well i couldnt remember whether it used to come on straight away or not, that's why i checked the voltage it gave out. (5v from the moment you turn it on)

    i also tried to find some software to monitor the CPU temp so that i could let it get hotter and hotter to see the fan will eventually come on.

    i tried cputhermometer.com but it just sat at 48 degrees while i could feel it getting hotter and hotter??

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    Have you got it plugged into the right port? as stated most fans now on comps are CPU controlled that voltage drop might be the completion in the circuit so the CPU knows their is a fan their and remember it never runs at full speed all the time it is variable ie CPU controlled

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    Did you replace the gunk on the heat sink assembly?
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    it is definitly the right port,

    if i plug it in, and turn the laptop on, how long should I wait for the fan to turn on before I bottle it and power down due to it getting too hot?

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    did you replace the heatsink compound?
    Is the fan connected to the port on the motherboard the right way round?
    If it's a modern pc, it'll shut down when the CPU gets too hot automatically.

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    As the 2 above said the thermal compound needs to be replaced.

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    use coretemp and speedfan

    coretemp is the most accurate temp wise apart from the BIOS

    and with speedfan you can turn the fan right the way up even if you cpu is cold what i used while i overclock

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    sorry, forgot to say, yes i replaced the heatsink compound, and ensured it was all bedded down correctly, i know it is critical.

    the plug only goes in one way

    the laptop is about 3-4 years old

    ok i'm gonna plug it in later and fire it up and wait and see if it comes on. i'm scared!

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