I picked up a Shadow a few weeks ago, got it home, cleaned the playfield a little, repaired the Sanctum area and then installed a Color DMD. Well last night I finally put some balls in the game turned it on and saw the "Opto Trough Bad Check Connectors, Wires and 12v Supply" error message on the Color DMD. After seeing the message the game just starts ejecting and shooting balls out again and again in a loop. I turned the game off and checked the two opto connectors (re-seated) and they are fine. I was able to start a game one of the times but like before the game just continued to eject all balls over and over again.
I'm not sure if my issue could be tied to me installing a Color DMD. As the Color DMD WPC instructions state I removed (well I just disconnected) the original 8 pin DMD power cable (J-604) from the game. The Color DMD power cable needs to go to J-116 which already had a connector. As mentioned in the instructions I removed the existing J-116 connector and used the included male-to-male adapter to connect the original cable and the Color DMD cable to J-116. I re-seated the connectors and the issue is still occurring. I saw in an older Pinside issue that trough board issues may be tied to J-116 to J-118?
Any other suggestions?