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Optoma EP739 Projector Overheating

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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  • john_schiman May 21, 2008

    Same symptoms. My projector is about 4 years old. Used to work fine but now will only run about 45 minutes if cold. If already warmed up it will only run about 15-20 minutes before shutting down.

    Verified fan is running all the time. I even put a home cooling fan near the unit and it still overheats but not as fast.

  • 7_gixxer Jan 25, 2009

    We have 2x EP739 projectors at our church and are both about 3-4 years old. Both over the last 6 months have had the 'overheating' fault and will only last a max of 45 mins before they shut down!

  • Anonymous Apr 24, 2009

    Seems this is a common problem.  I have the same issue.  I have put a small fan to blow away all the hot air.  THis helps, but its not a solution



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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.

Posted on May 25, 2009

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I have mine on "high altitude mode." and it still shuts down

Posted on Feb 15, 2010

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I set mine to high attitude mode and it resolved the problem. Fans get a bit noisy but not a problem. I also removed the back cover. Optoma EP 739

Posted on Aug 30, 2010

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Unit is shutting down due to bulb overheat

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.

Feb 01, 2013 | Optoma EP739 Multimedia Projector

1 Answer

When i first turn it on the message (projector over heated will automatically shut off lamp) comes up and then shuts off after 2 mins

You have an overheating problem.To solve it

1) Ensure that there are clear air pathways around the projector

2) Clean the air filters.

3) Ensure that the fans are running. If the fans don't run the projector won't fire it.

It is likely that cleaning the filters will solve your porblem.

Feb 15, 2011 | Optoma EP716 Multimedia Projector

1 Answer

Can the Optoma EP739 be ceiling mounted and projected upside down? what are the steps to do so? also, what would be the best mount for said projector?

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.

Dec 02, 2010 | Optoma EP739 Multimedia Projector

1 Answer

EP739 projector has been overheating the last 6 months.

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 **** 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...

Jul 21, 2010 | Optoma EP739 Multimedia Projector

1 Answer

We have a optoma ep739 used at our local football club;but whenit gets warm it cuts out until it cools down;isthere any filters that need cleaning

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...

Mar 01, 2010 | Optoma EP739 Multimedia Projector

1 Answer

Optoma EP739

The lamp cover has a disconnect that wont allow the unit to power on while the cover is off.

Try taking the lamp cover off and bending the little piece of metal you find underneith.

It worked for me.


Nov 01, 2008 | Optoma EP739 Multimedia Projector

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