What brand/style LEDs? In some cases using different LEDs helps. CT premium non-ghosting LEDs worked the best in my games. I am surprised the LEDOCD didn't work for you, so maybe someone will step in with more info.

It sounds like you have some issue with the lamp matrix wiring, a diode, etc. that is causing a problem. LED OCD can fix issues with timing and/or leaky transistors, but it cannot fix lamp matrix wiring problems.

Is there a pattern to what lights turn on and what lights cause them to? For example, anything in row 1 (11, 21, 31, etc) causes lamp 81 to be on as well.

You can use the "jumper and bulb" method to test your board outputs and narrow the problem to either a board or wiring issue. The Siegecraft lamp matrix tester is a great tool that makes this same test even easier. Neither of these test will pinpoint a problem in the wiring, though. The best way I know of doing that is to make a full summary of what lights you're trying to light and which acutually turn on, then look for patterns.

Did the issues ONLY arise after swapping to LEDs?

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check all the diodes and make sure one of the diodes are not touching metal they shouldnt be.

Also , you could try changing the fade settings on the LEDOCD app. Ie change to 50% fade for the dimmest setting to see if the problem still arises.

Incandescents require more current to light up than LEDs. If you have a small amount of current, the LED can light when the incandescent didn't. Also, while installing LEDs, you could have bumped something, causing a short that was not there when the incandescents were installed. When I say wiring, I'm using it to mean everything under the playfield vs the controlling circuits on the board.

It doesn't have to be on the lamp in question. You can have a shorted diode on a lamp that appears to be working fine, but it is allowing power to backfeed a different column. The full pattern will likely point to the issue. Diodes can leak, but in this case, it's unusual to cause what you're seeing. It's much more common for one to be squashed over and shorting to a socket.

There are ways to use the LED OCD to help diagnose, but you really have to know what you're doing, and usually it just complicates the diagnosis.

This is a typical sys 11 issue that is in the light matrix . I believe you will find that you have a "bleeding" driver.

I had a similar issues with Simpsons DE and got the same advice you're getting in this thread about the lighting matrix and diodes. Before the LEDs, I thought it wasn't an issue. It became one with regular LEDs, and switching to non-ghosting did not help.

I switched back to incandescents in those sockets and realized that the problem was actually happening with the incandescents as well, but the amount of light was pretty minimal. Because LEDs need much less voltage to light more brightly, the existing problem became much more obvious.

The game left my house before I could diagnose this issue, so I can't give any additional help right now. I'm very confident that this doesn't have anything to do with the LEDs, but rather they are highlighting an existing issue that wasn't noticeable when you had incandescents (or, as suggested, the problem was started because something got jostled during your install).