If your sources are connected directly to or internal to the TV then it will need to be serviced. You could try just unplugging it from AC for a 5 minutes and plugging it back in. If you are handy you could try replacing a board.
The folks at www.shopjimmy/com sell boards and are quite helpful.
If your sources are connected directly to the surround sound then try connecting one directly to the TV. If you get picture then the surround sound has a problem.
Check any cables to make sure they are connected correctly and firmly.