If you are facing ‘no sound’ issue from the TV connected to a set-top box, try the following steps.
1
Check the volume of the TV
check the volume
2
Set the sound output to TV Speaker
B Series: Home> Menu>Settings>All Settings> Sound> Sound Output> TV Speaker
A series: Home> Settings> Sound> Sound Output> TV Speaker
sound output tv speaker
3
Perform a sound test
B Series: Home> Menu>Settings>All Settings> Support> Device Care> Self Diagnosis> Sound Test
A series: Home> Settings> Support> Device Care> Self Diagnosis> Sound Test
sound test
4
If the sound is audible during the test, then use another input source (USB)
Note - If sound is audible while using alternate source then kindly get the set-top box checked.
5
Disconnect the TV & set-top box from the power socket.
Check the cable connections (HDMI, AV, Composite).
Re-connect the TV & set-top box to the power socket and check for sound again.
Regards,
Rachel Gomez
