Hi @shuo,
Welcome to the Roku Community!
We would like to know more about the issue so we assist you. What brand is your Roku TV.? In addition, would you be so kind as to provide additional information regarding the issue you've encountered so we'll be able to identify the solution to provide?
With more detailed information, the better we can assist.
All the best,
Kash
Takashi O.
Roku Community Moderator