Da Vinci Pro 1.0 Extruder not heating up

Did you not read this post?

http://www.soliforum.com/post/135330/#p135330

Also are you sure your printer is the big 1.0? That looks like the PCB from one of the mini's or JR. On the 1.0 the heater was not even connected to the board. There was a harness that came from the main board and ended at a connector just above the extruder where the heater would plug in. This connector was often defective and the source of many issue.

The easiest test you can do is use a blow dryer or hot air gun and heat the hot end with the power on. The temp on the hot end reading should rise. If it does not then again it is an issue with the thermistor, not the heater. The system expects the heater to heat the hot end several degrees in x time. If it does not see this change it cuts power to the heater. The thermistor is responsible for getting and showing this change in temp.

All you did in your test was connected the ground side of your hot end to an unswitched ground. On these printers all parts like the heaters have power at them when the unit is on. They then use logic to switch the ground on to allow current to flow and allow the unit to heat. So your issue again as said above is that logic is not turning on your heater as it cannot verify temp.

They must have made some changes since I had mine then. What you need to do is follow the traces from the red and black wire to the ribbon connector and see which pins they go to. This should not be too hard as it is simply a two sided board with no internal layers. A continuity measurement from pin to pin will confirm which pins it is, but you should be able to follow the trace as well. If you have continuity from the black wire to the ribbon connector pin and continuity from the red to the ribbon connector pin then it is not this board. From what I see if your images this board is just a pass through for the heater. There is nothing on the board that is active for this connection that I can see in your images. Like I said it heated because power is already at the heater as it should be. By connecting it to any ground the heater will heat. you could have connected black wire to the frame of the printer and it would have heated.

I had a 1.0 I did much work on including gutting and converting to a ramps 1.4 controller and LCD. I am also a technician by trade so I am sure I can help you out.