Same here, Scepter 55". The remote was working perfectly for the Roku and the TV, then stopped. I changed the batteries and tried re-pairing. Now the remote works for the roku, but not the TV. I go through the pairing process, but the music never stops playing. I tried the Sony ones too.
I'm having a hard time believing that this was not a software update that stopped supporting my TV.
Yes I have the same exact tv. My Roku did automatically update and right after the remote quit working for the tv. Same issue when trying to pair again. I found this topic on google. With no answer from Roku. Except the one that was useless. I do believe we all was smart enough to do before looking for answers. So I guess we all have to wait for a new update to fix this. If they decide to make one.
This kind of thing happens via a software update with unexpected unwanted behaviors. They must not be testing our totally awesome walmart special sceptre TV's back at the lab. It won't get fixed unless a bunch of people complain, or maybe if it catches the eye of @RokuDanny-R and he opens a ticket to have it looked at.
In these days of "woke" and "cancel culture" I'm feeling a little vulnerable owning my Sceptre tv and talking about it... perhaps a little shame that it cost me so little.... perhaps it's too much to ask... or but a dream that it will work with my expensive ROKU Ultra?
When a remote doesn't have the proper code for sceptra brand of tv, if you're lucky you can use the sony tv code. But if move the goalpost to where neither the sceptra or sony codes work any longer, there isn't anything to do until it get fixed via software update. Its not that they're targeting sceptra here, there is dozen threads dealing with roku remote not controlling a sony tv any longer!
The only thing you might do if your tv accepts hdmi-cec commands, is to go into the secret remote menu switch roku remote from IR to cec.