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The button on the back of the TV only cycles through the inputs, no volume control. There is a volume control and a mute button on the side of the remote, easy to push by accident when pushing buttons in the front.
Sorry, there was a problem. Please try again later.The remote features volume buttons located on the right-hand side of the remote. You can also download the free Roku mobile app on your Smartphone or tablet to use as a remote. Through the Roku mobile app, you gain access to power toggle, volume toggle, private listening, voice search, and more. Hope this helps! Thank you, TCL Customer Support
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