Hi
I’ve had the same problem. Suggest the following.
1) unplug tv and then Re plug in after 2 mins
2) turn tv on via the power button on the back or side of tv
3) remove batteries from remote control
4) press the red power button on the remote for 30 seconds
5) press all buttons on the remote control (while it has the batteries out!)
6) replace the batteries and try using the remote