Stoney, you've sort of got the right idea, except that if the player sends a 1080i signal to the set, that means that the player has already done the scaling from 480 to 1080, so the set doesn't need to scale(the set's scaling may be better, worse or about the same as what the player does). What the set still has to do is deinterlace the i to p so that it can be shown on the 1080p display.

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Enjoy the music, not the equipment.