The soundbar is for audio - do video out from the cable box to the TV. An option is to buy an extractor about $20 at Amazon - I use it with a Firestick. Firestick goes into the extractor, an optical cable to the soundbar, and an HDMI for video to the TV. I had been fighting the lip sync issue for a long time and finally found this suggestion on a forum and it works. As far as using the smart TV for programs I think the TV speakers will provide audio. Haven't checked, because I only use the Firestick. Good luck.
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