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If it's a CRT RPTV a lot of them scaled 480i/p sources to 540P or 1080i which made it look better on certain sets (and hence the "hdtv"). There's a chance his television may also accept an incoming 1080i signal via component. YMMV depending on the actual tv set, available settings and the equipment used along with it.My first guess would be that it just does 480p and nothing higher. Have you tried searching the part number.