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
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My EP739 never got to the point where it actually shutdown due to overheating, but the root-cause may be the same. First thing you must do is clean out any dust and debris that may be restricting airflow. If that doesn't help then read-on... My Optoma EP739 started exhibiting color-banding and strong color shift after years of great service. After trying other suggestions that didn't work, here is the FIX for my unit. I have not seen this posted anywhere else.
Problem: After 10-20 minutes of use, color-banding and then a strong shift to purple/green with almost no red. If the unit is turned off for 5-10 minutes to cool and then powered-up again the problem goes away, only to come back in another 10-20 minutes. Enabling the "High Altitude" setting in the Setup Menu helped for a while (a week or two) since it forces the main cooling fan run at high speed always, but then the problem re-appeared.
Reason: Overheating. The electronics are overheating. Like several people have suggested: First step: Open the unit up and blow-out/vacuum all of the accumulated dust. Assure BOTH fans (there is a small drum blower directly cooling the lamp and a larger regular fan that circulates air through the entire unit) are operating and clear of debris.
Once you have done that, then look for the REAL issue. With the front panel (i.e.the panel with the hole for the lens) removed and looking into the projector from the front examine the metal heat shield on the right side above the lamp. In my unit, because of years of service and heat, the aluminum lamp housing had deformed slightly, tilting this sheet metal heat shield directly INTO the air stream from the fan. This restricts the airflow enough to reduce cooling capacity. This metal shield should be high enough above the lamp to be TOUCHING the plastic case. If it is bent down and is halfway into the air stream then it restricting the exhaust airflow, causing the overheating.
Fix: Bend the heat shield back up so that it is not in the exhaust airflow. It must be ABOVE the airflow, protecting the plastic case from the heat of the lamp. This simple remedy fixed the issue for me. My projector has been running 2-3 hours a day for 10 days now with no banding issues at all. That's it. Simple fix.
Mine has been in place for about three years. Because the ceiling was open I was able to create a connection for a tripod head on the ceiling and then using a STRONG tripod head and some small bolts (longer than the originals) I mounted an external base and with the tripod head fitting dttached to the projector it just became a matter of running the various connector cables from the sources I use that require projection to my wall.
Its getting old...and generating more heat... There are fans inside the projector that **** in ambient air and blow it across the parts...A quick fix might be to lower the room temperatrue a few degrees...or you could get a small fan, place it along side the projector and have it blow additional air into the projector...
The projector is running at borderline temperature...
Also, make sure it is on a flat hard surface...and not resting on a cloth or towel or rug...there isn't much space between the bottom of the projector...to **** air in...and it needs all that space...
You may want to make sure the AC line voltage is 110 -120 VAC even a slight drop in this voltage will cause the projector to run less efficient which means running hotter...
take the lamp out, there is a fan directly looking to the lamp... clean it with a compressor. and after that at the menu of projector there is a place called 'High Altitude'. turn it on. And it'll be fine...