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Looking at the specification for your TV i'm afraid it doesn't support screen mirroring. Your TV does support DLNA but it doesn't look like it can play the videos in your phone over DLNA either according to http://esupport.sony.com/US/perl/support-info.pl?info_id=797&mdl=KDL46HX800.
What you can do is to get an MHL-adapter like our IM750 and connect the phone to an HDMI on the TV using a cable.