Thank you for posting your question on Just Answer! I will be happy to help you with this problem.
this is a very common sense approach.
(Please click on high lighted words)
First push the menu button with the set s remote and if nothing comes up then
Friend this is a very common problem with LCD and also DLP within the power supply the capacitors
Start to fail and the way you can tell is to check them visually for swelling or expanding of the top.
It will be easy to see the bad caps will not be as flat on the top as the good ones, this is the problem,
Exchange them and you will be ok,
Well good luck friend.