Check your cables
In order to receive channels you will need to have an aerial plugged in. Make sure this is securely inserted into your TV and at the wall socket.
If you are using a wired connection, make sure these cables are securely connected to your TV and your router.
Retune your channels
Navigate to Settings via the remote or Android Home Screen
Select Watching TV
And Channel Setup
Choose Digital Auto Tuning, and then give it a couple of minutes to retune and check to see if your signal is back to normal.
Planned Engineering Works
Every so often maintenance works are carried out to keep your transmitter in top condition. This might weaken your signal or interrupt your service.
Check the Freeview website to see if your transmitter is affected.
Not sure which transmitter you’re using? Pop your postcode into their coverage checker to find out.