TIPS: Your TV must support the HDMI-CEC and ARC function. HDMI-CEC and ARC must be set to On. The setting method of HDMI-CEC and ARC may differ depending on the TV. For details about ARC function, please refer to your TV owner’s manual. Only HDMI cables of version 1.4 or higher can support the ARC function.

While in HDMI ARC/OPTICAL mode, if there’s no sound output from the sound bar and the HDMI ARC/OPTICAL indicator blinks quickly, you may need to activate PCM signal output on your source device (eg. TV, DVD or Blu-ray player).

Laut Anleitung muss der TV ARC und CEC kompatibel sein. Hatte dasselbe Problem und musste es schlussendlich mit der 3.5mm Klinke lösen.

ciao...usa un cavo jack audio