IMPORTANT: This article applies only to specific products and/or operating systems. Check the Applicable Products and Categories section of this article before starting these steps.
If there is no sound or low volume on your Sony TV, the simplest solution to most sound issues is to check the speaker setting on the TV.
This video will show you the best ways to troubleshoot your TV sound issue
For more detailed information, refer to There is no sound or low volume coming from the TV speakers.
To find out how to perform factory reset, refer to How to power reset, restart, or set the Android TV or Google TV back to original factory settings