I have a hitachi Ultravision TV about 10 years old... It turns off on me. When I try to turn it on it wont. I unplug it a light lights up on inside when it goes on and shut right off
It's best to replace it with a new flat panel. Most TV repairs cost just about what you can get a new one for. You don't say how big it is, but you can get 50" plasmas now for $500, less if you look. Repairing that TV will likely be at least half that.
I don't recommend trying to crack it open and repair it yourself. There are components in TV's (capacitors) that can store high voltage even after the TV has been unplugged.