It may be due to a break in the connection u just put on the tv and try to hear some sound in the speaker when u switch on or off the tv if u cant hear then it is sure the wire inside may be broken or the amplifier ic is defective u have to change it
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Increase the volume on the TV and/or your connected media device (streaming player, Blu-ray player, cable or satellite box, etc.). Check the audio settings on your TV and connected devices. Turn off and unplug your TV and connected devices. Inspect the TV cables and ports, then check the ones on your devices as well.
Check Mute. Make sure the sound on your TV isn't muted. Push the Mute button on your TV remote. ...
Adjust Volume. On your TV remote, use the Volume Up/Down buttons. ...
Sound Menu. Push the Menu button on your TV Remote.
Are the speakers' cables connected correctly? (p. 37) Is "Sound Mute" active? (p. 13) Is the volume set to the minimum? Is "Speaker output" set to "Off"? (p. 22) Change "SAP" settings. (p. 16) Check "HDMI 1 in", "HDMI 2 in" or "HDMI 3 in" settings. (p. 22)
Hope this helps, page# refer to your manual.
Well there is still a problem with the TV. I found that by unplugging the power cable that the digital channels worked. But, when I turned the TV on today the problem had returned, I had to take out the power cable again!