The light inside my actually tv screen is blinking, not the light above TCL, but inside the screen. It blacks out one side of the tv while the other is perfectly fine. Tv was bought in 2016.
This sounds like a hardware issue that needs to be referred to the manufacturer of the set.
Roku TV Partner Support Contact Information
TCL
https://support.tclusa.com/televisions
1-877-300-8837