GT2560 - PWM cooling fan suddenly not working

[marco.barbieri11@gmail.com]

Hi every one,

Is almost one year that i'm printing with my geeetech prusa i3X, yesterday suddenly happened something weird....
Right now the PWM fan run when shuold be OFF (7/8V measured with tester) and most of all if i set the fan from the LCD command ON at 255 the fan stops....
I realy do not know wath could it be.

Any help would be greatly appreciated!!!

[marco.barbieri11@gmail.com]

I've try to reload the firmware in the board, but nothing changes...
I really need some help.

[William]

Will the fan ran after you connect it to the PWM-Fan? if not, I think you need to check the MOSFET, the PWM fan is controlled by the pin16 of the main chip. When you turn on the fan, then the voltage between the pin3 and pin1 of the MOSFET is 0V, and when off, it will be about 11-12V.

[marco.barbieri11@gmail.com]

Thank you, i'll changhe the mosfet.