I have a TCL Roku tv and the remote is no longer working. I have replaced the batteries. There is no pairing button on the remote. There is no roku stick. I just have it plugged from an HDMI cable to the tv and into the outlet. This makes no sense that it worked for years and now it's not.
Please contact your TV's manufacturer directly to report this issue and request additional support. Each Roku TV manufacturer provides direct support and warranty services for their products running the Roku OS.