The optical cable works properly if you see a red light on both ends.
Fiber optic port on tv.
Connect the other end to the optical in on your home theater or stereo system.
Try changing the channel on your tv to another digital broadcast.
You can pipe the hdmi video from the source say your cable box into your tv then turn right back around and pipe the optical audio out to your receiver and speaker system.
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The optical out port also called spdif or toslink is used to send digital audio from your television to a sound bar or stereo receiver.
The audio data is converted from digitally encoded electrical pulses to light on the transmission end using an led light bulb.
To ensure that you will be able to transfer digital audio you need to ensure that the source that you are using is sending a digital audio signal to the television.
Digital optical is a physical connection that uses fiber optics to transfer audio data from a compatible source device to a compatible playback device using a specially designed cable and connector.
Go into the sound or speakers menu of the tv and select external speakers or audio system.
The connectors mechanically couple and align the cores of fibers so light can pass.
There is good chance that a premium audio video receiver manufactured anytime in the last decade or two has a toslink port.
Remember toslink has been on the market since 1983.
Securely connect one end of the optical digital cable to the optical out on your tv.