Some months ago, I did the upgrade of my Ender 3 Pro with the Big Tree Tech kit (SKR MINI E3 V2.0 + TFT35 E3 V3.0) and I was very happy with the result until yesterday. I’ve changed the fan of the motherboard and then, both hotend and the bed are turned on after I power on the power supply. This means that without start a new print, both are getting hot and sounds an overheat alarm.
I’ve been looking on internet about it and found something saying that I have a problem on the mosfet on the motherboard.
Is this problem something usual? Is there a way to test if this mosfet is demaged?