Electronics > Beginners

PC Fans

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vinlove:
I got 2x fans from old ATX PC case. Not sure if they were for the processor or just cooling fan in the case.

They are quite small, and each has red and black cable coming out from the core, and it says on the fan 12V.

So I connected them to my PSU, and turned to 12V. But no action. The fans are just still, not moving.

I got my DMM and checked resistance of the red and black cable, and it reads 10M ohms. Both are similar resistance.

Are these fans dead? Or what? Why are they not working with 12V supplied to them. There is no switches, just two cables from the fan.

madires:
Do they spin freely when turning by hand?

Brumby:
Wouldn't matter much whether they spin freely or not - for a 2 wire fan, 10M ohm = dead.

vinlove:
What sort of reading should it be, if they were in working condition?

Monkeh:

--- Quote from: Brumby on July 25, 2019, 01:04:15 pm ---Wouldn't matter much whether they spin freely or not - for a 2 wire fan, 10M ohm = dead.

--- End quote ---

I just grabbed a 12V 2 wire fan I know to be working. It reads around 19MΩ. So.. no, not that simple.

Assuming you got the polarity correct, they're likely just plain dead.

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