Hey mate this is more a comment about a similar situation i had than helpful advice. I had the bright idea of replacing the batteries so turned the power off changed the batteries powered back on and WTF no display. Read thru the manual and found out that this task should be performed with the power on. After a lot of research and finding some very good electronics dudes who knew less about pinball machines than i did and an exhaustive process of elimination i paid $600 aus for a new dmd board and away we go good as new. Very bright tho the new display but no more blown fuses or any other issues been couple years now sweet as. Good luck with yours hope you get back playing soon. I love my LW3

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All my ribbon cables are aligned as you say with red at 1. I have one suggestion, test all wires in that ribbon or replace it with a new one. Pretty obvious and basic but often its just that. Worth a try you never know