Is it possible to unpair my Onn Tv IR (infrared) remote from one of my TVs in my man cave?
Sorry but no. It works or it doesn't work that's how IR remotes are. Its controlling another tv brand, other than ONN?
It controls a TCL tv.
If the TCL is a Roku tv as well, you could upgrade each of the tv remotes to wifi, once paired to given tv it will only control that one tv.
Remember that a tv can accept both wifi and IR at the same time, so its important to switch both from a IR remote to wifi remote. Without any roku tv IR in the room no more conflicts.