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I seemed to have had the exact same problem... I had placed the projector on top of a small book (to raise the unit), however, did not rest the feet of the projection unit on the book and it overheated and turned off, as a result. (The bottom of the unit was making direct contact with the book which caused it to overheat since not any air was passing through between the two)
After letting it cool for a while and powering it up -- it would usually power off completely for about 15 minutes. After a little thinking, I thought it may be the lamp/bulb and waited a couple of years and bought one online that arrived yesterday.
I installed the new lamp/bulb this morning and it did the same thing. It powered down about a half hour later. Bummer.
I reset the machine to factory defaults and checked to see if it had the 1.03 firmware... It did
Then went through the settings in the setup area and turned off the 'prevent pic screen saver'... Reset the 'lamp hours'
I doubled checked the lamp/bulb installation... Turned it back on -- same thing -- it shut off after about 15 minutes or so... Then unplugged the unit and turned it over and took out the 4 or 5 chassis screws and loosened and took off the side panels and blew onto the fans and circuit board areas and gently pounded the sides to shake anything that shouldn't be there loose and put it back together.
i powered it back on and now it's been working for about 2 hours and 16 minutes!
Make sure the PC itself is not going into a power saving or screen saver mode...this is the most common issue when playing completely automated presentations or movies. Normally, I suggest turning off all power saving functions in the PC or Laptop, and disabling the screen saver all together.
So, Shutting down to protect itself. The error light says it needs service, Cycling power makes it work for a few more minutes, then the Panasonic safety circuit shuts it down. Projector shuts down when bulb life gets to the danger zone, and also when its heat sensor says there is a problem. So you have a bulb life issue or you have a dirty projector / fan cooling issue??
I say clean it up with some compressed air when it is cool, then check the # of hours the bulb has on it (in the menu).
Lastly brace yourself, the bulb is gonna hurt you :-$
First of all, DO NOT unplug the unit until the fan stops. The fan should continue to run until the lamp has cooled down completely. This is normal. If the unit is shutting down on its own, perhaps the fan is not working good enough. Check for debris in the fan area and be sure that there is enough ventilation to keep the unit cool. The shutdown may be a safety shutoff because of heat.
Check the fans and update this with what you find.
Does the projector work normally when sitting right-side up? If yes, something could be interfering when the unit is inverted. The symptom you describe initially sounds like a defective fan (some fans put out a computer pulse telling the main board it's running--they have 3 wires, red, black, yellow(signal)). If the board doesn't get signals from all required components, it's programmed to shut down to protect itself.