Choose the Output device as your Apple TV or the AirPlay device. Now, you can hear the sound on your TV. If not, try the next fix. Change Settings on Apple TV. 1. Go to Settings on your Apple TV using the remote. 2. Click on Audio and Video in the list of settings. 3. Further, select the Audio Format option. 4. Next, click on Change Format. 5. The physical Siri remote is designed to work control different TV's volume. It is not the same as trying to use one TV's remote to control another. Your question was regarding using the remote app on your iPhone. That hardware is not capable of sending IR and thus it can only work with HDMI CEC. Volume control via CEC is only supported on Reset the TV's Sound. Samsung smart TVs allow you to reset the device's sound separately from the rest of the system. This can sometimes fix problems like stuck volume controls. To do this, go to Settings -> Sound -> Expert Settings -> Reset Sound. The process shouldn't take long. 2. Restart Apple TV. Rebooting your Apple TV is a common way to fix glitches like no signal, remote not working, and more. Step 1: Open Settings from the Apple TV home screen. Step 2: Scroll to Press the 'menu' button on your Vizio remote. Navigate to and select the 'System' option, using your remote. Navigate to and select the 'Reset & Admin' option. Select 'OK'. Put the parental code, if you have manually put one. If you have not manually put any parental code then put '0000' as the password when asked for. Check if your issue is resolved after each step. Unplug both ends of your HDMI cable, then firmly plug them back in. Try using a different HDMI cable to check if the cable is causing the issue. For HDMI 2.1, use an Ultra High Speed HDMI cable. For HDMI 2.0, use a Premium High Speed HDMI cable. In the TV menu, make sure that you select the HDMI 881l.

volume on tv not working