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.