Help fixing FAN issue

[engpedrorafael]

Hello,

I have a problem with the FAN0 and I would like to fix it, but there is no schematics of the board BTT-E3-RRF available.
I measured the input of the MOSFET controlling the FAN0 and instead of having a PWM signal with 5V sqared wave, I read a sqared wave of 1V.
I imagine that there may be a transistor, optocoupler or something similat between the GPIO of the CPU and the MOSFET broken causing the issue.
Can you please indicate if there is such an intermidiate component, where is it located and which is it so that I can fix the board?
Kind regards,

Pedro Almeida