You talk about having only one remote control. How does that work?
There are 2 possibilities:
1 ) Our remote control has 4 programmable buttons on the top right (Power, Source, VOL+ and VOL-). They can be programmed to control your TV or your A/V receiver, as the case may be. Just point the TV’s remote to ours, execute some keystrokes and the TV PLUS remote will now control the needed functions of your TV.
2) The TV box supports various functions of the HDMI CEC protocol. This just means that the TV and the box can talk to each other over the HDMI cable. So you can program the TV to turn off or on the box when it goes off or on. Or vice versa.
In both cases: you’ll basically need just your TV PLUS remote.