@topvint check the caps around the voltage regulator, i had a problem with a megacd, that was solved changing the capacitor around that area. Check too the repro mobo, maybe has some cold solder points. Last check the megacd with 240p test suite for md that have diagnostic for mgcd
here's a raw clip i shot of the prototype SONY camera that was developed for F1 The Movie.
the head was custom by Panavision - 20 of these units were made... 4 on the car at a time, and 2 with remote panning.
lenses were Voigtlander wide angles (same as Top Gun: Maverick)