Thanks for the guidance - much appreciated!!  I'll do some testing and let you know what I find.

I agree about bad 74ls04's on these boards.  I had a board that was missing all the moving sprites on one side - turned out to be a bad 04.

What are your thoughts on this issue I'm having:

Revision 4 board - The left (main) side of the board (looking at it with the edge connectors on top) is displaying a white screen, however, the game boots up and will 'play'. You can start a game and hear the game sounds as the joystick and buttons are used. The right (sub) side of the board works fine.

Posted this to KLOV as well, but just got a response to check the connector and wiring, even after I explained in the thread that there are no issues with the wiring, power supply, monitor, etc.  I have 2 other boards that work just fine in the game.

Thanks Ian.  I knew the boards were interchangeable between the two (other than some of the switches being mapped differently), but I wasn't sure about the power supplies.  I've got some weird graphic issues on an Asteroids and I've eliminated everything down to either the monitor or the brick. Both were rebuilt, but the problems persists.  Picked up a couple of G05's this weekend, so I can se if its chassis/tube related.

Anyone know if a power brick from an Asteroids Deluxe can be used in an Asteroids?