How do you connect an LG Smart TV, Vizio Soundbar, cable box with cable remote?

Redsoxfan6899

Commendable
Dec 9, 2016
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I have an LG 55" 4K Ultra HD Smart TV 55UF6430 and a Vizio 5.1 Surround Sound Soundbar system SB3851-DO. It is connected like this HDMI cable from TV HDMI-2 ARC to Soundbar HDMI Out (ARC). Cable Box HDMI to TV HDMI-1. Playstation 3 HDMI to TV HDMI-3. All sound connections appear to work with soundbar and TV working with cable box remote. Cable box remote can turn off TV & Soundbar, but when cable box remote turns on TV and Soundbar there is no sound (even though the Soundbar is on) and I have to use the Soundbar remote input to cycle through the different inputs until it gets back to HDMI-ARC and then the sound comes on. Why won't the sound come on when it is first turned on?
 
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