Hello folks I need help. Last Jan I bought a Sony KDS-55A3000 TV. A few weeks ago I lost the picture.

When you turn the TV on the powe LED flashes for 10 times then it flashes red once and repeats the cycle. I've done some research and somebody recommended to change the lamp, so I just did. The lamp didn't resolve the problem. Any other ideas? Ballast? How to replace it? TV is only 15 months old.
Thanks in advance
dG