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Are the fans all starting up? The symptom you describe is often associated with a faulty fan. Also could be a failed lamp, as the projector will shut down if the lamp does not strike within a defined time, although in this case the 'lamp' light should come on
Here is some information on this model which I hope will help...
The lamp indicator lights when the lamp is due to be replaced. It will flash if a circuit abnormality is found. The temp indicator lights if an abnormal temperature is detected. If it goes too high it will shut down flash.
The lamp indicator is furthest away from the power switch if that helps.
If the lamp timer was approaching the end of the lamp life you would see a REPLACE LAMP nag screen when the projector is turned on. The fact that you have not mentioned this suggests that this is unlikely to be the problem.
The filters on the model are on the underside. There is a removable panel directly under the lens. You should not use canned air as you are blowing dust into the projector. It is recommended that you use a vacuum cleaner. Filters should be cleaned every 100 hours and replaced when the projector is relamped. You can wash the filter by hand with water only, ensuring it is dry before replacing it. Do not run the projector without the filter in place.
reason for fan spinning at high speed after shutdown is to cool down the projector after it has been on
you will feel hot air from exhaust as this is taking the heat away from the lamp, where all the heat is generated
if it shuts down after 20 mins either the projector is blocked, maybe, a fan is not running, filter blocked, or the motherboard is now u/s
check the follwoing : check lamp physically for melted filament, white deposits on filament/ reflector, if so change lamp if lamp looks perfect, the ballast needs to be replaced, also check for fans if they are running fine
The unit could be able to sense fan operation and prevent the lamp from lighting since this could cause heat damage or even a fire if allowed to light without any cooling.
If you can see the fan, try pushing gently on the blades, left, then right, to see if the fan shaft wobbles.
It sounds as though the unit is overheating. That would explain why the fan keeps running, and once it cools down enough it starts up again. What kind of environment are you running this in? Is there a way to put it in a cooler environment? Even having an external fan blowing on the unit could help.
Honestly, unless you've got it in a very hot environment, it also sounds like a poor design for heat dissipation. Or possibly the heat sensor is bad, and shutting it down at a lower temperature than it should.