Apparently there is more than one "Jedi Board". I have seen photos of and have the card that holds the extra RAM. As far as I know that's the Jedi Ram Adapter.

But the long, thin board that conatins the speaker, and into which the Inverter Board plugs, is also the interconnect between the Screen and the Motherboard.

This one is clearly labelled "Jedi Interconnect Board" in my machine, and it is this one to which I referred above. It's also the one that has the big ribbon cable which connects to the Motherboard, and the keyboard connections.

Without that board, there is no way to connect the video to the screen...