Hello! @Linab,
A friendly welcome from the Roku Community!
We appreciate you reaching out to us. We're pleased to assist.
It looks like it will require some assistance from our friends at TCL to help diagnose your TV.
You can reach them here: https://support.tclusa.com/televisions or at 1-877-300-8837
Thanks,
Arjiemar
Arjiemar
Roku Community Moderator