u/Glass_Duck8571

I bought a second hand ender 3 s1 with a sonic pad, and for a few weeks it worked great until a few weeks ago where the throat fan stopped working and i could only hear a faint beep from it. I checked the fan with a psu and it worked and i also replaced the breakout board on the extruder, but it still doesn't work. The connector supplies 24v as it should and i also replaced the cables from the fan to the board so the hotend should be good. i am suspecting a problem with the main motherboard but i am not sure. Does anybody here now how to fix the problem? Its very frustrating.