What should I do if there is no sound coming from my receiver?
Check the volume level and the mute status of both the TV and Set-Top Box, then reboot the Set-Top Box. If the device connected to the HDMI port cannot decode the digital audio format, go through the receiver menu and select the PCM format as the audio output option. (Page 15)
From the official Technicolor Uiw4020cog manual, page 15
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