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If your TCL Roku TV displays an image just fine but doesn ... If the sound is absent only from the Roku menu, check that the menu volume isn’t disabled. Go to Settings > Audio > Menu volume.
Control their TV with Vizio’s SmartCast app, available on iOS and Android. Stream from their phone using Google’s Chromecast and Apple AirPlay. TCL’s 3-Series runs on either Roku or Android.