Facing TV Problems? Ask a TV Technician.
Hello, You cannot manually change the digital audio out put signal- on almost any TV out there. It's silly that soundbar and home theater manufacturers give this as a solution. The audio is decoded in the form it is sent. So, now there's a couple of other things that could cause this- first, right now are the TV speakers producing sound, or did you shut them off already?
Additionally, what "Input sources" are you using- and how are they connected?
The TV's optical out will not output all sources- it depends on the type of signal Input (HDMI, etc.).
Let me know.