Hi @waiku,
Welcome to the Roku Community!
Thanks for the post regarding the black screen and sound issue with your TCL Roku TV.
For this issue, have you tried contacting TCL support yet to inquire further? I'd suggest starting there to see what options or suggestions they can provide. Each Roku TV manufacturer provides direct support and warranty services for their products running the Roku OS.
You can reach them here: https://support.tcl.com/us or at 1-877-300-8837.
Please keep us posted on what you find out.
Best regards,
Mary
Mary F.
Roku Community Moderator