Cannot adjust the picture and sound quality while using Google Cast.

The picture and sound quality cannot be adjusted while using Google Cast. They are set in accordance with YouTube app, Google Play Movies & TV app, etc. Follow the steps below to adjust picture and sound quality (YouTube as an example):

1. Press the HOME button on the remote.
2. Select YouTube in the Apps category.
3. Play any contents.
4. Press the ACTION MENU button on the remote while playing the content.
5. Select Picture adjustments or Sound adjustments to adjust the picture or sound quality.
6. Perform Google Cast again to check that the picture and sound quality have been adjusted.