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Don't cut power to a projector when you power down. The fan has to run after the projector is powered down so that the lamp can cool evenly. If you unplug or if there is a power failure the lamp will develop cracks around the edges of the reflector and will fail quickly. If the fan is not moving air through the projector, it will overheat and shut down.
Typically when electronic devices just shut themselves off it's due to some type of overload, the most common are thermal and current. If you can power it back on again after the device has set for a while it's generally thermal overload (device is getting too hot) because if it was current overload you would have to change some type of fuse or reset some type of breaker. Has the fan stopped operating? Next time you power it up, keep a close eye on it. If it doesn't run at all or if it stops during operation theres probably something mechanically wrong with the fan. If it runs the entire time it may not be running fast enough the venting ports could be clogged with debris. If youre technical enough you could take it apart and blow out all the venting ports including the fan (if you do this BE SURE TO BLOCK THE FAN WHILE BLOWING AIR THROUGH IT, IF YOU DON'T YOU RUN THE CHANCE OF RUINING THE BEARING IN THE FAN AND THEN YOU'LL HAVE TO REPLACE THE FAN!!!) also a lot of these small venting fans have a small oil port for them, it's usually a sticker that says oil on the center of the fan. Use a light weight oil, just a small drop or two and it's generally a good idea to try and get it running before sealing it up just so you don't fling oil all over the inside of the case and on boards but be careful not to touch any of the circuitry and don't leave it powered on too long, just enough for the fan to get to operating speed and make sure it's not leaking oil, if you run it for too long with the fan off you could overheat the circuitry and damage something and make a bigger problem. hope this helps :)
Check the lamp cooling fan of your projector one more time. may be its has some problem. its not running at the correct RPM. Do one thing, Remove the fan from the projector. In the fan there will be a specification sticker. Remove the sicker. now you can see a hole in the center. its the bearing part of the fan. put one drop of oil in it. u can use any type of lubricating oil. rotate the fan leafs with finger for some time. after that re-stick the spec sticker. insert the fan in the projector. power ON the projector and watch. ok
You haven't stated which exact model, but yes, on many electronic devices the cooling fan speed is automatically controlled according to need. Most current flat panel tv's (except for ultra budget, old technology "no name" designs) incorporate this feature.
This cuts fan noise, prolongs fan life, and uses a little less power. Just make sure that the ventilation slots on the tv are not choked with dust, and on models with removable gauze filters make sure that you clean them every month or every week if it's a dusty environment. Removable filters are more commonly fitted to LCD projectors, but I've seen a few flat panel tv's with them fitted as well.
If the fan becomes especially noisy or stops altogether (some designs do allow the fan to stop for short periods though) then you must get the tv serviced as a failed fan is cheap, but an overheated tv can be more expensive to repair. They all have thermal cut-outs which usually put the tv into "protection mode" if the tv overheats, but fault diagnosis is usually faster and cheaper if this can be avoided. Much better to avoid letting it overheat to begin with.
This sounds like a typical temp. sensor that is faulty.
If you take off the top cover of the Projector and follow the cables from your fans to the Mainboard - you'll find a smallish board that regulates the heat of the Projector. You will also find another sensor on top of the lamp housing.
Try replacing the sensor that goes with the fans first , this is normally the one giving problems.
I have a HP VP6111 projector that works fine on a table top but overheats ( overheating ) when turned upside down and hung from my ceiling. My solution...I went to Circuit City and bought two 80mm computer fans. I also purchased a 12V power supply from Radio Shack. I put one fan on front of my projector and the other on the back of the projector and wired them into the 12V power supply. I mounted both fans with velcro. The front fan pushes air and the rear fan pulls air. The projector now runs fine without shutting off. The fans are 12V and push 34 cubic feet per minute of air. I am very happy with this solution.