Sony KP-41T65 41" Rear Projection Television "350 radio sound" Questions

Radio Shack cost me a total of $30 to fix my TV. The authorized Mits repair man i had out to look at my TV before i tried to fix myself said that i need a new ballast and/or light engine and quoted me

...350. About 2 weeks ago, the picture has gone dead completely. There is still great sound, but no picture. i feel like i have a 41" radio in the livingroom. Any ideas? - I don't want to invest so much ...