According to the Creech manual:

J116 is provides +12VDC to the coin door at J2 on the coin door interface board.
J117 is provides +12VDC and +5VDC to the dot matrix controller at J606

It's been over a year since I installed a ColorDMD but you are welcome to check it out here because I opted to not tap into the power driver board on my STTNG.

http://www.pinballrevolution.com/threads/sttng-colordmd.800/

Replace F116 at the upper left corner of the power driver board. It's the fuse that powers unregulated 12V which is the same circuit your trough optos are using. With the fuse blown, the trough thinks it's loaded with balls and keeps ejecting them onto the playfield.

Yes, F116 provides 12V to the ColorDMD as well as the playfield optos.

It's F109 on WPC95 and on the right side of the driver board.

Randy

Can measure and post the measurements of the 5 volts and both 12 volt test points?

Use the continuity (resistance) setting on your multimeter and check all the fuses. If you're multimeter has a speaker it should beep when the fuses are good meaning current is flowing. You can't tell if the fuse is blown by looking at them.

Yes, best to measure at J116 since that is going right to the ColorDMD. Though you should be able to measure it off the connector that was pulled out to add the power adapter in for the display so you don't really have to remove it at J116.

J116, j117, and j118 are all the same. You can use any of those. But it's possible your 12v fuse keeps blowing the second you replace it. So you need to test the fuses with a meter not just say "that didn't work".

Also, as a side note be sure check the manual for the correct fuse size. I have found people will put in larger fuses than recommended for some reason. Maybe that's all they had at the time and forgot about it? Who knows. Never assume the fuse you took out was the right size, especially on older games.

Don't worry about a super small amount of resistance. You care here only about open and short.

You mean switch problem, not coil problem.

It's likely your playfield is not receiving 12V.

Please make sure that the playfield power connector (the one that normally goes to J116) has been reconnected to the ColorDMD power cable using the supplied male-to-male adapter.

They only go in one way. You can force them in upside down but the clips on the header fit naturally with the prongs on the plug. It should be very easy to figure out how to put it in correctly especially if you pull j116,117, or 118 and look at those connectors orientation.

The connectors are all wired in the same order

1 gray (5v)
2 black (ground)
3 gray/yellow (12v)
4 key

The key pin is the one with the peg in the socket. If there are only two wires on one of the connectors, they will be connected in the locations above corresponding to the wire colors.

Make sure you get this right as wiring 5v logic to 12v can severely damage your boards. I would recommend you seek help from someone in your area experienced with pinball repair.