There are a variety of causes for picture breakup (‘blocky’ picture) on Freeview. We’ve listed them below from most to least likely, to help you identify the issue quickly and effectively.
The TV picture freezing or breaking up in this way is most commonly caused by a weak signal. This might be because there is limited or intermittent coverage at your address, or your cable connections may be faulty (see below). If you have good coverage or have previously had good reception, try retuning your digital box or TV to reload channels.
Certain weather conditions can also affect the signal, especially high pressure and snow.
Equipment & Set-Up
Check the condition of cabling and connections. Damaged or loose aerial plugs can cause problems. Try disconnecting aerial amplifiers or splitters which can sometimes lead to equipment getting overloaded or too little signal.
If your TV set is close to other electronic devices (such as refrigerators and boilers), they can cause interference.
If you are still having problems, contact either the Confederation of Aerial Industries (CAI) or Get Me Digital who can give you details of one or more members who operate in your area and guarantee their work:
Find an approved CAI installer at Get Me Viewing
Find a digital professional at getmedigital.com
A local installer will understand the circumstances and local geography in your area and suggest the best option for you.
You may be getting TV signals from two or more regional transmitters at your address. It may be that your preferred services are appearing lower down the list of channels than you expect, in the 800's channel numbering range. Using the ‘favourites’ function, you can save these channels so that you can find them more easily.
Alternatively you can manually retune your device or TV to select your preferred regional service. If this does not help, contact the manufacturer of your equipment for support.
New added or changed Freeview channels can go on your device simply by rescanning the channels.
You can retune the channels by going to Settings -> TV Channels -> Rescan.
Make sure you have the aerial signal connected to your device.
Also, you can check which channels are available in your area by clicking here (https://www.freeview.co.uk/channels-at-your-address#28fSOSOxrqGAff1e.97)