Did you do it this way?
First: Disconnect the cable connected to Chain#1 to test Chain#2 hash board.
Second: Disconnect cables connected to Chain#1 and Chain#2, turn over the control board, and then connect the Chain#1 to Connector#2 of the control board, to test Chain#1 hash board.
Note: Since there is no +12v in the Connector 1#, you have to turn over the control board to test Chain 1#
Thanks to point that out. Those are the small things that the eye sometimes skips.
Gonna test it that way and post the results here.
I turned over the control board and connected the connector #1 to the chain #2. It didn't worked. I quite don't get why do I have to flip the controller over since I see the screws holding it to the case are only grounding the PCB. I checked the cables were connected correctly.
EDIT: Fixing typos.