First, let's confirm the Roku you have. The Roku Express doesn't come with a remote with TV controls. The Roku Express+ does. That makes a difference. Since you used the "Express" name and have a remote that has TV controls, I'm going to proceed as if you have the Express+ and not the Express.
Next, not all TVs can be controlled by Roku remotes. Many can. Heck, most can. But not every TV model can be controlled by the Roku remote.
For some that can be controlled by the Roku remote, some TV models have different code configurations and it can be difficult to get the right one of your particular TV model doesn't use the most common code for that model.
I'd suggest trying to reconfigure your remote for your TV.
Settings > Remotes & devices > Remotes > Voice Remote > Set up remote for TV control
Go through the steps to configure the remote for the TV. Keep in mind that it may not work. That's because Roku didn't program all the hundreds and hundreds and hundreds of different remote codes into the remotes.
DBDukes
Roku Community Streaming Expert
Note: I am not a Roku employee.
If this post solves your problem please help others find this answer and click "Accept as Solution."
