We cleaned the filter on the projector and it has never happened since. Assume that it was overheating due to lack of airflow.
I have same projector and had same issue. An NEC repair guy said that usually means it is getting too hot. I set a little fan next to it when it is on and I no longer have this problem. This can also be caused be re-lamped bulbs. Problem usually goes away if you have a re-lamped bulb and buy a factory bulb.
As there were no indicator lights lit I focused on the AC. The projectors work as they should in another location and as such I am fairly certain the problem is associated with the AC power in the particular room. I haven't isolated the exact condition as yet.
Thanks
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I have a MT1055 that recently started shutting down, just like the MT850. Lamp hours are less than 300. It is random... I could be watching for an hour, or 10 minutes, then it just shuts off. No indicator lights. If I wait for 20 minutes or so, the indicator lights reappear and I can power it back up. But it will only keep shutting down. HELP!!
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