The first step in diagnosing TV sound problems is to check the connections between the TV and all external audio devices. Make sure that all cables are connected, with no loose or broken ends. Check the user manual to make sure you have the right type of cable for each connection. If everything seems to be connected correctly, try disconnecting and reconnecting each cable to make sure the connections are secure.
If you have an external audio device, such as a surround sound system, make sure it is switched on and set to the correct input. For instructions on how to change the inputs of the devices connected to your TV, see the user manual.
If everything seems to be connected properly, try another TV show or movie to see if the sound problem persists. If so, check the settings on the TV itself. Make sure the volume is turned up and that you have selected the correct audio output option. The options vary depending on the TV model and the type of external audio device; please refer to the user manual for detailed instructions.
If you're still having sound problems, try resetting your TV and the devices connected to it. This will restore them to their default settings and may resolve any audio problems caused by incorrect settings. Once you have done this, check the TV's sound again before taking further troubleshooting steps.
If you are still having problems with the sound of your TV, please contact the manufacturer or a qualified technician to help diagnose and fix the problem. They can provide additional information that will help identify and fix any underlying problems.