“55R635 TCL phone support says that TV volume/mute control will not control that function to a soundbar connected by way of optical connection. Is this a hardware issue or one that might be overcome by firmware update? Only through HDMI ARC connection?”

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• Correct you have to use two separate remotes

  Answered by LRKNANA 5 years ago

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• To control functions like volume and mute of a connected soundbar with the TV remote, you would need to connect via HDMI ARC and your soundbar would need to support CEC. Hope this helps! Thank you, TCL Customer Support

  Answered by TCLExpert 5 years ago

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