Can't Mute the Sound from the Devices Connected Through the Optical out and HDMI ARC Using My MASTER Series TV Remote Control
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The sound from devices connected through the DIGITAL AUDIO OUT (OPTICAL) and HDMI® (ARC) port of the TV can't be muted using the MUTE button on the TV remote control. This is a TV specification and part of the normal operation. Lower the volume or mute the sound from the connected device.