IR remotes are very simple. With good batteries, they either work or they don't, as long as there isn't a stuck button. Just make certain you have a clear line of sight between the TV IR receiver windows and the remote. What I can't tell you is where that receiver window is located. Somewhere along the bottom, and that's the best I can say.
You can check to see if the remote is working by looking at it through a digital camera, such as a cell phone camera. Look at the window end of the remote through the camera while you press buttons on the remote. If you see a flashing light, the remote is working. If you don't, then it's not. If a change of batteries doesn't fix it, then it has to be replaced. For a zero cost option, you could try using the Roku app on a iOS or Android phone or tablet, as long as the phone and the TV's connected to your home network. But if you need a new remote, you can find generic IR remotes for less than $10 in most stores that sell home electronic devices. Just make sure it lists Roku TVs as a supported device. The majority do.
Dan
Roku Community Streaming Expert
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