Audio is present from one of the speakers only

1.    Unplug & plug the power cable.

2.    Check whether the cables are connected correctly between your TV set (or Hi–Fi) and the receiver (right & left audio outputs, SCART or HDMI or S/PDIF).

3.    Reconnect and hand–tighten the cables.

4.    Check the TV set for faulty speakers.

5.    Be sure wires are not frayed and plugs are not bent or broken.