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Regrettably, we can only advise on how to change the Aspect ratio through the Picture settings in the menu on your ENERGY STAR® Qualified LG LG - 40" Class (39.5" Diag.) - LED - 1080p - HDTV - Black, Model # 40LH5000. For instructions on how to change it on your set top box we recommend that you contact the Customer Support for your set top box...^IFV
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