Channel set up greyed out

[Leodocian]

My Sony smart tv was recently set up and aerial linked into a talktalk box and I have been using that to watch and record tv and using the Sony handset to access YouTube.  However I now wish to stop using the box and so plugged the aerial directly into the TV.  I then went into system settings/channel set up only to find that the options for the analogue or digital settings were greyed out.  I am not tech savvy so it's hopefully something simple that I've missed.  Thanks for any help.

[Win_88]

Hi @Leodocian

It would help if you let us know the model number of your TV.

Could you unplug the TV from the mains for a few minutes and disconnect the box completely before trying to tune again?