Sound but no picture.

Well, I have an LG 32IN578V tv. I've had it for a number of years now. I was watching the tv and it was working perfectly fine. I went to get a drink, but when i got back to the tv there was no picture, but i could still hear the sound of the program playing. I turned it off and back on again but it still wouldn't come on,

-I've taken the back off but cannot see any obvious damage or wear.

-I've tried the flash light method and i CAN see the picture faintly.