Hey, I have an 42LG50 that recently started powering up for 2-3sec then powering down, and keeps repeating for about 2-3mins and then it works fine as if nothing is wrong. As soon as i go to turn it off, it start going through the cycle again. I can only turn it off by unplugging it directly! Any ideas as to the cause? I opened the back and blew out dust and checked cap's and all seemed fine. Thanks for the help!