Close the HEOS app completely and restart it. If you use a Wi-Fi connection between your HEOS device and the access point AND the problem is intermittant, a reboot of

How do I enable HDMI CEC? Adjusting HDMI CEC settings Turn on the connected device. To enable [HDMI CEC Settings], press the HOME button, then select [Settings] — [BRAVIA Settings]

No sound comes out Check the connections for all devices. link. Check that speaker cables are properly connected. Securely tighten the speaker terminals. Check that a proper input source is