I have a Miller 211 mvp and I have a issue with speed control. It runs full speed at any setting when weldind. I checked speed control dial and it is ok. MILLER tech support said it is the board. Any help would be appreciated!
The guys will need a better pic than that buddy - need to trace the speed
Control back to the first scr ( transistor ) and test - that would be my first point off call - if that’s soldered both sides I would send that off for repair unless your mega confident with a soldering iron