I'm having this same issue. Is a repair the only option? Will resetting the tv to factory settings help?
Dip9, there's no way to say for sure what the problem is, but if you've verified the remote is transmitting using a digital camera and the TV doesn't respond then it could be the IR receiver. A factory reset most likely won't help and will probably make the situation worse since you need a working physical remote to set up the TV. If the TV is still connected to your network, you can use the Roku mobile app as a remote. You can also get a Roku voice remote, but you have to pair it by using the mobile app as a remote to get to the pairing routine or factory reset the TV.
Have you tried updating your tv software?
I have model 65S455 and the same issue. I bought a new remote, still can’t get TV to respond. It is probably the IR Receiver. Spent long time with Roku support still won’t work. I am going to try and clean IR Board but if it’s bad… need to replace board. Is it possible to add a new IR sensor using the USB connect? Perhaps with an after market remote?
