Cut the power to the Smartstick so you know it’s off.
Switch the TV off.
Restore the power to the Smartstick. Does the TV turn on?
If not, turn on the Smartstick from its remote. Does the TV now turn on?
If it has turned on, on either of the last two steps, then it has used CEC (BRAVIA Sync) to do this, and it will have switched to whichever HDMI input the Smartstick is plugged into.
You can now control its range of features with the Smartstick remote.
If you want your broadcast channels back, press TV on the Sony remote.
If the TV didn’t turn on in any of the above, though, turn it on with the Sony remote. It will be set to show broadcast channels. And if you want to see what’s on the Smartstick, you will have to use the Sony remote to choose the HDMI channel that the Smartstick is plugged into, and then use the Smartstick remote to control the NowTV range of features.
Note that if you did get CEC above, then the Sony remote will attempt to be the Smartstick remote for as long as you are watching NowTV, but it can probably only do some of the things the Smartstick remote can do, and this will be confusing as to what it can and can’t do.
Therefore use each of the two remotes only as described above, to avoid this confusion, at least to begin with.
YouView Superuser, but not an employee of YouView, nor retained by them for this purpose. It's purely me speaking
