how much would it cost to repair a 1080P TV?

[DavePS3]

Impossible to say because of the unknown (where the problem actually is). If the color wheel was bad, you'd know it. Basically, rear projection doesn't look quite as good as Plasma overall but if you don't feel you're getting all you should out of the set, call tech support at the manufacturer and ask a few questions like, "Why doesn't my Blu-Ray at 1080p look any better than my 480p DVD'? It's likely just in the munu settings but might as well go right to the source and see what the manufacturer says. That's what I'd do. If you draw a blank there, call a store that sells (or used to sell) that model and ask the sales guys if they know of any issues.