Thanks for the post.
If you are getting an error code or message, refer to this link for common Roku error codes and their recommended actions: How to connect your Roku device to the internet using Wi-Fi or Ethernet
However, if still no dice, contact the TV manufacturer to report the issue and get help. Each Roku TV manufacturer provides direct support and warranty services for their products running the Roku OS.
For a list of Roku TV manufacturers contact information, visit our Community post here: Contacting Support for Your Roku TV
All the best,
Kariza