What Sony LED TV Model do you have? Is this a new TV or did the problem just start on your previously working TV?
Do you have the User Guide/Manual to check the menu setup, configuration, and troubleshooting options? You may be able to push certain buttons and do a factory reset and that could fix it.
What else, if anything, is connected to the TV? Disconnect to see if the distortion stops.
1) Double check all of the cables and plugs for tightness and placement.
2) Try another set of cables.
3) Try the original cables somewhere else to see if the problem follows the cables.