In the same boat right now as well
I've had 3 DMS3 one was a v1.2 and the others are v2.0. I got absolutely nothing. I wrapped 2 26AWG wires together for both, the ground and power and still go the black screen. I wonder what the deal is and if there is a component that we can add to the board to make it work.
I posted my install that worked in a v7 an this is the same way I've done the others with bad results. SO take a look at help me out. I will change to 20AWG to see if that helps.