GT2560 PWM Fan always rotating

[smokehead]

Yup, suppert told me same thing, but i made test yesterday. I connected FAN to PWM port(Fan is always working) On LCD screen I set 0 for FAN, the voltage between "2" and "1" on Pin16 was 0, when I set 255 for FAN on LCD the voltage rise to 3v, and when I changing between 0-255 the woltage on Pin16 was moving from 0-3V. On PWM FAN slot i have always about 10.5v- 11v. So what can we say about this?

[bang]

Weird...
But i think maybe you can replace it to take a look?
How do you think?

[smokehead]

You mean mosfet(pin16)?

[bang]

No,i mean the mosfet Q5.

[giannis]

Suddenly my PWM fan is always rotating.
I have changed the fan but the problem remain.
I suppose the mosfet is broken .
I have a Arduino Uno board, can i use it with the pins from the second extruder that is not in use to control the fan speed ?