No sound comes out

Check the connections for all devices. link

Insert connection cables all the way in.

Check that input connectors and output connectors are not reversely connected.

Check cables for damage.

Check that a proper input source is selected. link

Adjust the volume. link

If the TV audio cannot be played from this unit, it is possible that an audio format this unit does not support is being input from the TV to this unit. Switch the TV audio output setting to PCM format.

Make sure volume is not muted. link