Every few years you often need to re-tune your Freeview TV as the way the channels are organised and broadcast changes. Sometimes my TV lets me know, sometimes it’s a broadcaster that says something on air (which I usually miss) and more usually I find a load of channels missing and wonder what happened. This was certainly the case when my children mentioned missing channels on our Sony KDL48W605. So a quick check of the Freeview website and it was apparent that a re-tune was needed of the TV.
If the TV needed doing, I guessed that EyeTV on my Mac would also need to do it too. The mechanism for doing this is, is not entirely intuitive. What you have to do, is to use the EyeTV Setup Assistant.
Go through the screens until you reach Auto-Tune TV Channels and then click the Auto-Tune button.
So I let the EyeTV software do its job and all my channels were back to how they should be.