I am running an Ender 3 Pro. All standard stuff just using PLA. No mods. Yes, a newbie.
Printer is about 3 months old.
Prints started to fail and I noticed that the fan that cools the hot end (extruder part) was not running.
I bought a new fan. I cut off the old fan and tested it on a 24v battery. It worked!!
A voltmeter on the supply wires from the main board showed just a few millivolts.
So I suspect the main board has failed. But all other aspects of its performance are working.
Before I go buy a new one, I would appreciate the view of experienced 3D print experts.
Does my diagnosis make sense? Do boards fail in that way? Just seems odd to me that a single 24v supply isn't working.
3DM