Please follow the troubleshooting steps below to resolve your issue: Please try to straighten the cable as much as possible. And then try to check if the cable is physically damaged. You can use a flashlight to irradiate one side of the connector, and see whether the light would go all the way out to the other end. The cable is fine if the light went through. If not, I think probably it was damaged. Maybe it was the cable crushed during the transit or over bended for some reason. Please remove the protective cap before using. Make sure the cable is properly connected on both ends. Please kindly select “External Speaker” and then select either PCM or Auto as the Digital Sound Out when you connect this optical audio cable on your TV. If there is no audio signal coming out, try to plug and unplug the cable until it is tight enough. Then reboot your devices. Make sure you have turned the volume up.