I made i silly mistake today, i had to change connection to printhead, cause of burned pin (typical issue) and i cut all 10 wires at once when the printer was ON The printer turned off and 12v led lighting connected to the same power supply also and i smelled some electrical aroma. After i finished new connectors i swiched printer on, everything looks good, but after a while smoke came out, PLA started to burn. Heating is going up after turning on printer, without any command, target temperature is of course 0, on both heads is the same problem. Temperature goes up to 400C, i don’t expect problem like this, rather oposite.
So right now i don’t know what to do, mainboard looks good i don’t see any burned elements on it.
I checked the wires are connected in a proper order, so cause must be related to shorted circuit.