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Identifying which lead is which on case fan

Discussion in 'Windows XP' started by MowermanEd, Jan 26, 2006.

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  1. MowermanEd

    MowermanEd Thread Starter

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    Nov 25, 2005
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    I'm trying to help a friend by jury rigging a 40mm case fan attop the heatsink of an unidentified video card. The original fan has died and I have a spare 40mm case fan that has 3 leads, +, - and a speed sensor lead. I plan to solder the new fans leads to the pin connector on the card but need to know which of the 3 leads is the speed sensor? The fan has a yellow, a black and a green lead. Does anyone know which is which?
     
  2. Colossus610

    Colossus610

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    Jun 15, 2005
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    I would assume the Yellow is the "+" and the Black obviously is the "-", thereby leaving the Green to be the speed sensor.
    But I would try playing with the leads with a "AA" battery or "D" battery and see which combo of wires gets it spinning in the right direction, I would also assume that the green wouldnt do anything no matter what it was hooked up to.

    I would start with
    Yellow--- "+" terminal on battery
    Black --- "-" terminal on battery

    I doubt
    Green--"+" terminal
    Black---"-" terminal
    would elicit any response whatsoever

    I could also recomend possibly finding out what voltage the old fan required, and see if the new fan's power requirements are similar or same as the old.
     
  3. MowermanEd

    MowermanEd Thread Starter

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    Problem solved!

    Green= +
    Black = -
    Yellow = sensor
     
  4. Colossus610

    Colossus610

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    ....or I could be wrong.....:D


    ...what do I know?

    Congrats either way!
     
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