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.