Some models also include the New YouTube for TV app. When using the New YouTube for TV app you may experience a black screen, or an error message may be displayed, and the video will stop playing.
These symptoms are not a failure of your TV, but are a result of specification changes made by YouTube®. Due to the changes, Sony has decided to delete the New YouTube for TV icon from BRAVIA® TVs, and the New YouTube for TV function will not be usable after September 30, 2016.
For additional information, including the models affected, refer to Termination of the YouTube App on Certain Televisions and Video Products.