That board sounds similar to the old Ender V2's we run.
They are known to back-power the Pi, you need to cut/blank-out the VCC(+ve) line on the USB cable/connector somehow.
Not sure if that is your problem at all, but we found it dropped the voltage of our Pi3 to the point of loosing some functions and triggering power warnings. It might be the same on a Pi4.
A test might be to unplug it from the printer
They are known to back-power the Pi, you need to cut/blank-out the VCC(+ve) line on the USB cable/connector somehow.
Not sure if that is your problem at all, but we found it dropped the voltage of our Pi3 to the point of loosing some functions and triggering power warnings. It might be the same on a Pi4.
A test might be to unplug it from the printer
Statistics: Posted by bensimmo — Thu Aug 07, 2025 10:51 am