LG TV Display issue

[ramanans_cdl]

Hi I have a 55LA6200 TV. It was working fine without any issues. I got the firmeware update to 04.28.13. Today suddenly the picture gone. I have powered off and On. IT worked for 10 min. Again got the same issue. Slowly the time got reduced. Once I switch on the picture came and after that it was totally black.

Any idea of what issue it might be... any body got this kind of issue?

Please help.