Geeetech

So I bought a proper PWM fan to use with my board as I got sick of having to unplug the parts cooling fan manually. I can't get it working at all and after a load of fiddling I later learnt that I have to be really careful in how I plug them together. I understand that if I get them in the wrong way round I can pop something. I've also read that all the Geeetech diagrams have the PWM fan back to front. Can anyone tell me how to test the pins, and is there anything on the board I can replace to fix it rather than ordering a new one?

Thanks.

Hello, if you want to modify a pwm fan, you can refer to this video.
https://www.youtube.com/watch?v=me5oj-PnMFE