It's the nature of the beast. The TV has to process the digital video bitstream more than the receiver has to process the audio so the result can be a gradual lagging of the video behind the sound...
http://en.wikipedia.org/wiki/Lip_sync
Some receivers have a sound delay control which you can use to try to sync them up. You didn't name yours so one does not know. Look in the manual. If it's not there then there is no audio delay to eliminate it.
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