Dragon's Lair is probably the most popular laser disc game. Finding one of these games with the sideart intact is very rare, due to the leather vinyl texture on the cabinet which caused the artwork to peel off relatively easily.
Symptom: Score board displays dim F's when not displaying anything.
Fix: The cause is from pin 9 (mode input) of the ICM7218 display driver ICs being unloaded. Connect pin 9 of both display drivers together then connect one end of two 1k resistors to pin 9. Connect the other end of one resistor to +5V and then the remaining one to GND.