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I have a spare laptop fan but I have no idea how to control (or even power) it. It has Red, Yellow, Blue and Black wires. I assumed red is +5V and black is your normal ground, but after applying 5v it doesn't move. Does it need any control signal, clock? I don't think it's that much sophisticated. I'd like to have it on all the time, how can I do it?

laptop fan

SamGibson
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Bartek Malysz
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    The yellow and blue wires are for PWM control and either a tachometer or locked rotor signal. You'll have to check the datasheet for the fan to see which is which; I've seen it both ways. However, the fan should run at 100% if the PWM wire is open-circuited. Do you have reason to believe that the fan is broken? – vir Oct 04 '21 at 19:36
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    Note that it is marked (right on the fan body) that it is a 5V fan, not a 12V one. Connecting red to +5V and black to 0V (with yellow and blue unconnected to anything) should spin it. If not, it's faulty. – rdtsc Oct 04 '21 at 20:57

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