Hi, @Kris86
Welcome to the Roku Community.
We see that you're having the same issue with the black screen display issue while the sound is working, as reported by Roku TV users in this thread. Kindly refer to @renojim's post above this thread. If the information describes the exact behavior of your TV, it's best to reach out to TCL directly since they'll be able to provide you with the support you need.
If you have further concerns or questions, please don't hesitate to let us know.
Best wishes,
Kash