i remember that i had this post bookmarked and while i was looking thru it, i realized your tv is the same model as mine. did you ever get yours to display correctly? if not i may have the solution if you are interested.
@Xdqwerty, Osu! Tatakae! Ouendan! is the Japanese version of the game, different settings/characters/songs but otherwise identical mechanics. I played that before I knew about Elite Beat Agents lol. Both fantastic games https://en.wikipedia.org/wiki/Osu!_Tatakae!_Ouendan