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A continuous flashing red light with the word LAMP on it would definitely mean you're going to need to spend a few bucks on a new lamp....or for a few more, upgrade to a TV from this century that doesn't require lamp changes :)
3 blinks is a lamp cover error, did you make sure that the lamp cover is screwed in tight? Also check the lamp cover for deformity, there is a problem with your model where the set over heats and melts the lamp cover a little causing it not to make connection with the lamp cover switch. Let me know if you find either of these problems? If not we can troubleshoot a little further.
Make sure properly connected and tightly sure cover put on and screws in,if change projection bulb,still blinking "LAMP" LED indication light.But,if "LAMP"LED indication flashes and making clicking noise.Ur Ballast board also dead.Require replacement,this Ballast board help to ignite the projection bulb.
Since you have not replaced its lamp yet. Symptom shows that TV lamp is weak and consume more then required current and causing error of shut down and reboot. Please replace lamp. Lamp light will lit when lamp would be dead, currently it is weak.
I don't know your set in particular, therefore I will be generic.
On some projection sets, there is an hours counter that is manualy resetable. Make sure that it is reset. If you can have a readout of the amount of hours used on the lamp this will tell you if this needs to be reset.
Normaly, when the set reacts as per your description, there is a cooling problem, or a fault in the power supply.
Also with your model of set, check to see if there are any safety switches that work with the cover or door for the lamp access. With the safety switch option, if the uPC thinks that the lamp is not properly enclosed or installed it will not allow for proper startup.
My too, same problem - tried replacing lamp ($150), no luck, replaced
ballast ($200) no luck, replaced power supply ($150) no luck and TSC is
telling me to replace the main engine ($600) - way too much for this
piece of junk (cost me $4000 in 2005) - don't buy optoma products!!!
its probably the ballast that is bad, call Optoma and you can buy a ballast for it, but you will probably want to have a pro do it, changing the ballast is a lot more involved than just changing the bulb, the ballast is what powers the bulb and it does go out on occasion.