This TV had an original bulb after many years, replaced it and started having problems with set shutting down. At first infrequent, but then frequently. After chatting with Samsung, removing and re install bulb, working again for a few days than starting problem again, and now have had a 10" fan running behind set and worked fine till today. With fan in place, started turning off again twice within 3 hours viewing time. Shuts down, red and green lights on panel blinking, and off. I have read a few post and they talked about ballast , color wheel, etc should the ballast be the first thing I look at replacing and BTW, the fan does come on when set turns on, as far as I can tell. Any help will be appreciated. Thanks PS ordered a new bulb, just in case (philips).