Geeetech

I bought an A30 that had a faulty 12v power supply. I installed a 24v supply and used buck converters for the fans and the mosfet.
The firmware installed is v1.59, if I remember rightly.
When I tried moving the z+ axis, via the GUI, the x+ axis moved. When I tried to move the x axis, the motor just vibrated.
I did not try the Y.
The heated bed and nozzle started heating up, even though they were switched of on the screen.
I checked the motherboard and all the wiring looks OK. The motor wires were all still glued in place.
There are TMC2208s installed and the vref is 0.7v on all.
Does anyone know what could be wrong here? My first thought is that it is the firmware but could it be the control board?

Hi，If you don't have heated nozzles and hotbed,
But if it will heat automatically,

You can try to unplug the hot end and hotbed from the motherboard.
Check the temperature display, if it still shows high temperature,

It may be a problem with the motherboard, and the motherboard needs to be replaced.

However, it is recommended to use the corresponding power box for printing.

I hope this can help you.

Many thanks William for your quick reply.
I shall try as you suggested.
It is most likely a blown board and there was a short in the heater cartridge on the hotend. This blew the power supply (some transistors and resistors were destroyed!). So it is likely that some damaged occurred on the motherboard. Even though it looks perfectly fine, with no obvious damage.