I have Ender 3 S1 printer with STM32F401 chip mainboard.
I’ve tried to add light bar to the printer and accidently short curcit PWM pin and +24V pin in the connector near Z-axis and Fillament Detector connectors. After that hotend fan not starting during hotend warms. If shorts that pins again, hotend fan start to work on full speed.
I think it is some mainboard issue, but I couldn’t find any bad elements on it. Can someone help me to fix this issue? Or the new mainboard is the only way?