I can't really suggest a diagnosis. With many DLP units on the market, a simple lamp reseating will usually do the trick. However, your unit is an LED-powered DLP, so there aren't any user suggestions that I have. It's probably best to have a technician inspect the unit.
I have a Samsung DLP 5687 with the same problem as most people when it's time to replace parts. Anyways, before I start buying lamps and stuff, I need some clarification. If I'm having the issue of the tv shutting down shortly after I turn it on and the 3 lights flash in the front, how do I know if it's the lamp or not. I mean does the lamp have something that tells the tv to shut off after a certain amount of use, even though it still lights up?
The tv is now 3 years old and the lamp definitely has had plenty of use, it read 11400 hours in the set up. I'll replace whatever needs replacing but don't want to buy parts that are still fine.
I tried jiggling the safety latch and made sure the back pushes down on it correctly. Fan seems to be working. It now stays on maybe 15 seconds before it shuts off. The only noise is a slight spinning/buzz noise like the fan winding down.