@droftarts Okay so I've been so busy that this whole subject fell out of my skull for a while, but I've had an idea.

Would it be possible to use a duex expansion board to cover the X axis stepper duties while I find someone to replace the driver?

I think I'm already beyond RMA window on this now.

@droftarts I didn't run anything from the ad card, I just moved via the paneldue.
The motor seems to be OK, its back in the printer I borrowed it from, using the same wire too.

Here's the sticker on the chip you mentioned.

@droftarts I was using a prefab stepper wire and stepper motor from another printer that was working normally for testing. I believe the motor is 1.33a rated.

I hadn't changed anything in the duet settings, so it was whatever the default values were.

On the subject of the voltages, I was monitoring them with a multimeter after the motor failed to move normally. I had 24v at the board input terminals, but I was seeing 16v in the duet interface on my laptop.

I checked the wiring was correct at the time, but it was a few weeks ago by this point so I can't remember the specifics, and I've been working on the alternative control board for the project in question so my head is full of marlin now unfortunately.

I honestly don't know what went wrong, I just want to get the board fixed, whether that be via warranty or paying to have the driver chip replaced (provided I can confirm no other faults on the board).

Working with marlin now or reminding me why I opted for the duet on this project to begin with.

@dc42 could you point me in the direction of where to start that process?
Would I be best going back to the supplier, or straight to duet?

To keep things simple;

I had a stepper driver fail at the first attempt, I suspect it might be faulty voltage regulation, but my own lack of experience is likely a factor.

I connected everything up to test motor movement, tried to move the X axis via the paneldue OSD, the motor groaned like it was stalling and vibrated.
I checked the reported internal voltage, and the board was reporting around 16v, so I checked the input from the power supply which was 24v.

I double checked the wiring to the motor and tried to move it again, and heard a pop from the board followed by the dreaded smell of the smoke escaping it's silicon prison.

How would I go about have the board checked and repaired?