Topics created by CrooKID

It sounds like the firmware has been erased at the very least. Please try reflashing the board using these instructions.

https://docs.duet3d.com/en/User_manual/RepRapFirmware/Updating_firmware#all-other-duet-boards

If the board shows up in Bossa and takes a flash, you should be alright. If not, then it may be damaged.

Do you notice if any components on the board become very hot to the touch not long after power has been applied?

Can you take some clear high resolution photos of the board itself so we can check for any obvious signs of damage?

Have you given the board a blast of compressed air just incase there is still some debris left behind that could be causing a short?

@CrooKID

If you have no luck with MotionOS, try VideoStream. It streams via a url that can simply be inserted into DWC.

https://forum.duet3d.com/topic/23759/videostream/12

Details are here:
https://github.com/stuartofmt/videostream

Discloure: I'm the author 😊

Your homing files are set to use an endstop, not a probe.

G1 H1 Z-266.5 F6000 ; move Z down until the endstop is triggered
G92 Z-2.5 ; set Z position to axis minimum (you may want to adjust this)

Replace those lines with something like

G1 X150 Y150 F6000 ; move the center of bed
G30 ; Probe the Z axis

@crookid said in Cant get 5v from Duet2's expansion header 5v pin.:

and have selected the EXTERNAL jumper and a 5v psu as the EXT 5V power source

When using external 5V power there is a diode between the external 5V input and the 5V bus on the Duet. That's why you only see 4.75V on the expansion connector. It should be enough for a BLTouch, but if in doubt you could connect the +5V wire of the BLTouch directly to your 5V external power input.

We could have been half way through a board exchange by now.

Please send an email to warranty@duet3d.com and CC your reseller. Include a link to this forum thread and the details of your original purchase. You'll receive a reply with a form to fill out.

Take extra care on wiring the replacement. Shorting the pins of the drivers are a good way to damage them.

Please send an email to warranty@duet3d.com and CC your reseller. Include a link to this forum thread and the details of your original purchase. You'll receive a reply with a form to fill out.