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the projector will shut off when the lamp hour count reaches expected lamp life. It will restart only long enough to read the hour meter again then shut it's self off again. You can manually reset the hour meter to continue using the same lamp.Good luck.......
The problem is not over-heating. The Optoma HD72 has a known problem that Optoma won't advertise. The lamp driver is faulty. They simply have to replace the lamp driver. I purchased a spare lamp with my original purchase. I had the exact same experience as you at around 1200 hours on the lamp in ECO mode. I used the spare lamp. Same thing happened at about 1200 hours. I had a friend at Optoma. he confided to me the problem. I sent it in and they replaced the lamp driver at no charge. I got another 800 hours out of the first lamp and am now using my second lamp and have about 600 hours on it. The pic quality is so good with this projector (used Digital Video Essentials to calibrate) that I'll just order a bare lamp or two and use the existing lamp housings when I need a new bulb.
the reason that it turns on without hitting the power button is that it thinks it's still in cooldown mode. while it's on, check the lamp hours through the menu. if it's close to 2000 hours (or the inside of the lamp is blackened or bulging), replace it. after market lamps never seem to last that long. if the fans stay on when the lamp goes off, it could also be the colorwheel. listen for chirping. if it chirps, it's the colorwheel.
either the lamp has/is going to expire, or the ballast is bad. if the lamp has bulges or black spots on the inside, replace the lamp and clean out your projector with canned air. too much dust keeps in the heat and makes a 2000 hour lamp go in 1100 hours.
hello, This is an unfortunate incidence and i will send you the serviceable manual of your projector if you can send me your contact email address to my email.Yes ,there are instruction to follow to replace lamps in projector if not you might miss it. First you must confirm that the lamp is OK from the vendors you purchase before anything.
Pls check if the lamp is not so old that is giving the same problem. If lamp is almost new, then you can have a check with the Ballast unit card and then the loose connection in the Power supply or may be overheating and tripping.