There are quite a handful of reasons why your Vizio TV has no sound. The first thing you need to check is whether the volume button is turned up. Tap on the Volume Up and Down buttons to do so. If there is still no sound from your television, you will have to reset your device. To reset your device, you simply need to follow the steps mentioned in the previous question. If the problem still persists, you need to get in touch with the customer support agents.