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Fan wiring ive been told by another tech to wire the cpu fan in a laptop directly to the power surpply as it does not recieve power in its current position and i know that it still works, i need to know where i should rewire it to? need detailed answear

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  • fougzki May 11, 2010

    And also if you hook up in that particular usb port have it covered so that it will not be use by another device(additional load, chances of overloading, and damage).

  • fougzki May 11, 2010

    Ok that seems trying to connect directly with the power jack. But in that setup, the fan would run only when the external power source is connected. If you are not within wall socket your problem is always there. If fan voltage requirements is the same with the external power voltage input.

    In any case this could also make the cpu fan to run until the battery power is dried up.

    But first try to see the voltage requirements of the fan if this is 5Vdc and its amperage requirements. I think you can hook it up on usb port. USB port usually is powered with 5Vdc only the amperage sink of the fan and the amperage it can give does matter. This will look like you connect a laptop cooler on the USB port. On this setup you can actually like having a relay switch within the system just like the fan on its right place. Hope it gives you an idea.


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That is absolutely wrong. You cannot wire the CPU fan to the power supply because you will most likely burn the fan out. The power supply (ac adapter) is most likely feeding 19 volts to the motherboard, which is broken down into lower voltages to run various components. The fan may only be a 1.5 or 3 volt component. Fan speed is controlled by the voltage, so it would spin up much higher than it is designed for.

And even if it did work, the fan would not step down or idle at any time so it would fatigue and burn out from constantly spinning at a high speed.

CPU fan failure would almost certainly lead to a cooked cpu, damaged motherboard or both. You should have the machine serviced to repair the fan circuit unless you are willing to risk the loss of the whole machine. It is too critical a component.

Posted on May 28, 2009

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