I've never heard of that TV, so don't know the specifications. What you need is a TV with HDMI inputs that accept 720p, 1080p or 4K (2160p) resolution. Had another user yesterday that had the same issue. His TV only accepted 1080i, and didn't support 720 at all.
Or are you simply referring to the power and volume buttons on the remote? Sorry if I misunderstood. But I believe there's a large number of codes that you can try to see if they work. I don't have any remote with such buttons, so not certain how to configure them.
Since I don't have one of those remotes, I don't know exactly how they are programmed to control a TV. But I was under the impression there's a way to select a device code and test its functionality. Sorry I can't offer further direction.
I do have experience of picking up brand and getting it to work on some Saturn name TV. My success was on Hitachi brand.
So you should try it and there is high chance you will find brand-replacement for your TV from the Roku list with different name.