The digital audio outputs on televisions sometimes only work when the television is on certain inputs. It does not always work with all hdmi connected devices. I can almost guarantee you that if you connected an over the air antenna to this television and scanned for your free local television channels the digital optical out between the tv and the surround sound would work.Likewise if you have Comcast or one of the other cable carriers that has digital cable you could connect the coax cable directly between the television and the cable wall outlet without the cable box and get sound from the tv's digital audio output to the surround sound.
However there might be a digital audio output television setting you have not changed. Refer to the manual for that or call customer service if necessary.
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