New Insignia NS-L55X-10A sound not in sync with surround sound

My new Insingina NS L55X 10A was delivered this morning, replacing a 7 year old 52" Hitachi.  Of course they just swapped the TV's, plugged it up and attached the cable coax and made sure it would turn on.  I didn't notice until they left, but the sound is out of sync with my surround system.  I didn't have this problem with the Hitachi.  I spent several hours, replacing all the cables with HDMI, and everything is still the same.  Is this a common problem and is there an easy fix?  What am I overlooking?  Thanks for any replies.

I misread your original post I guess. I thought you were talking about the lipsync being off from the sound when watching tv or a movie.
Yes it is possible for there to be a slight delay when using a receiver and the internal speakers of the tv. Normally its not too noticable but it can happen. Most people don't watch tv with both sets of speakers on, you either listen to the tv speakers or the receiver not both. I have owned several home theatre systems and sometimes there is a delay from one system to other. Normally not very much though.
Out of curiosity can I ask you why you would watch tv with both on? The correct thing to do would be turn your tv all the way down when using an amplified system or better yet disable the internal speakers of the tv if your using a surround sound system.
This may be exagerated to some extent with the new systems utilizing HDMI connections and advanced processing features. One device is processing the signal at a different rate than the other one so you could in fact get some sort of reverb effect by using both. The delay is going to be in miliseconds though. Or it is possible that the surround sound receiver is utilizing some sort of built in delay to some of the speakers. Where as the tv would not employ any delay at all. It could also have something to do with how the devices are connected or switched. One set up could possibly have less delay than the other.

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