What's wrong with my LCD projector?

One possibility is that the cooling fan is not working properly, forcing the bulb off to avoid over-heating. Check if you hear the fan whirring, and also if the projector gets very hot. If this is the case you probably need a professional to replace the fan motor, or the thermostat that turns it on and off, or whatever else has failed.

Your bulb is overheating. Either there is some sort of blockage of your air vents, inside or outside the projector housing, or your fan/thermostat is malfunctioning. If you cannot wait to have it serviced by a tech, try simply getting an external fan to blow on the whole projector while you are using it.

This may get enough airflow around the bulb to cool it sufficiently for usage. Make sure you get the tech to service it for a permanent fix.

Maybe you overused your projector. There are times that electronic equipments suddenly shuts off when they are fully drained. Make sure you have it tested using testing equipment.

That would actually help.

Check the voltage and/or wattage and if its higher than recommended, buy a bulb with the correct voltage and wattage.

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