If there's something wrong with your TV picture or sound, it may be because of a fault with your TV or your aerial, or work going on at your local transmitter, or some kind of interference. To try to work out what's wrong, go through this checklist.
Snowy or fuzzy picture, distorted sound, jumbled Ceefax text, no picture or sound: see Weak signal
Ghosting: see Delayed signal
Patterns, dots, flashes, loss of colour, buzzing, clicks: see Electrical interference
Wavy or herringbone pattern: see Radio interference
Smooth, evenly spaced horizontal bars - a 'Venetian blind' effect: see The effects of weather
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.