Hi there happy to help,
Could you please try the following.....
Get your cell phone and turn on the camera function.
Point your remote at the phone and press buttons while watching through the phone/camera's screen.
If the remote is doing what it is supposed to you will see flashes in the phone's screen from the IR light on the front of the remote.
Let me know the results and we'll go from there.
OK, if you don't see flashes, that's what it means. You then need a new remote. That is the best possible scenario as the new remote replacement will be much cheaper than if something was wrong with the TV.
Hope this helps,
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Have a great day.