I have a weird issue with the two opto boards at the end of the ball trough. The switch matrix for these always reads active/unobstructed regardless of whether something is blocking the opto path or not. The optos are'nt intermittent, they both just constantly read active. On both boards, the lower optos are lit up (you can see their red light), but the upper optos are not. The board with the two-pin connector has a very bright shine from the opto while the 3-pin connector board has a weak shine.

I checked the voltage to the pin connectors on both boards and they all read good. I re-flowed solder to every joint on both boards (pins, bulbs, transistors, chips) and still no luck. I even switched the bulbs on the 3-pin board and still the same results.

If, after much troubleshooting, I still can't figure out the problem, the board set is only ~$30 so I won't be out too much. However, before making a purchase I want to make sure the issue is in fact in these boards and not coming from somewhere else.

Any ideas on this?

GOOD CALL!

I ended up switching the boards and the LOTR opto boards give me the same results in Monopoly...so looks like I'm most likely dealing with something in the main boards.