Do I need a Google account to use my Android TV or Google TV?
You can enjoy some functions on your Android TV™ or Google TV™ device without a Google™ account. For example, you can watch TV programs, enjoy all Sony® apps, home network functions for the Album, Music, and Video apps, and use the Network Electronic Program Guide (EPG).
In addition, certain functions (except for the Google TV model), such as the Google voice search function, Chromecast™ built-in (Google Cast), internet browsing, and the YouTube™ app, are available without logging in to a Google account. However, you will not be able to rent or buy movies, TV shows, and apps from the Google Play™ Store.