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Optoma EP739 Projector Overheating

\015 We have an Optoma EP739. It started shutting off with the message "Projector Overheated" on the screen. I cleaned all the vents and the fan but it still does it. It is three years old and only used on Sundays. It just started this about 2 months ago\015

Answers :

Set the projector to "high altitude mode." It will be noisier, but won't overheat. I wonder whether using one of those $10-$20 laptop coolers underneath it might be a quieter solution.
I have mine on "high altitude mode." and it still shuts down
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