@WillGIam the issue is its difficult to diagnose remotely if the driver not fitted does not have a short or other issue, and if the MOSFETs are actually faulty or not.
@WillGIam said in Duet 3 6HC with defect driver:
driver 1 A+, A- B+ and B- and get about 8V to ground on every pin. With driver 0 I get 2V
the schematic is here:
https://github.com/Duet3D/Duet3-Mainboard-6HC/blob/master/Duet3_Mainboard_6HC_v1.02/Duet3_MB_6HC_Schematic_v1.02.pdf
Which may allow you to do some comparative probing to see whats going on. The output diodes and mosfets are in pretty small packages so not necessarily easy to remove using hot air, but possible.