Question about Optoma EzPro 739 Multimedia Projector

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Color bleed and Fan

Marrie,
I noticed that you had answered a similar question for another person on the board.  I have an EP739 that will bleed colors after a few minutes of operation.  I can change this by placing a fan next to the projector and putting more air through the vents on the side.  I am thinking that it is the fan.  Is there an way to verify, and if so, where can I purchase a replacement fan for the unit?
Thanks,
SMG1

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  • hackettr Sep 17, 2008

    I have the same problem. It just started. In addition, my unit frequently over heats and does the auto shut down.

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I had similar problems with my EP739 shutting down in the middle of a presentation. Optima told me to run the fan on the high altitude setting. But the real problem was I was setting the computer too close to the projector, and the hot air from the computer was being sucked into the projector. Once I learned to set the computer away from the vents on the projector, the problem went away.

Doug H.

Posted on Oct 09, 2008

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Unit is shutting down after ten min


My unit never got to the point of actually shutting down due to overheating, but your problem may be related to what I experienced: A bent lamp heat shield.

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

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

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

3 Answers

Color wheel failed. Can I fix it myself??


If you contact Optoma and they have the part available then, yes you can fix it yourself. You have to be good at taking things apart and remembering how they go back together. Changing the color wheel assembly is not that hard.

Oct 27, 2009 | Optoma EP739 Multimedia Projector

1 Answer

Optoma ep739 color was going greenish so i replced the bulb and now it seems to be getting no power at all? i tried several outlets and still no power, no flashing light, no led, nothing. Any suggestions?


These units have many safety interlocks. First make sure that all of the doors that you opened are replaced correctly. If not, the interlocks will prevent any power from getting to the unit. Update this with what you find.

Dan

Jan 29, 2009 | Optoma EP739 Multimedia Projector

2 Answers

Getting projector open to replace color wheel


You need to open the top lid of the DVD player and you'll notice 2 more screws. Those need to be taken out. Then the lid will lift off the base. You'll then need to undo a couple of the wires to completely remove the lid. After this, you will have to remove the silver lid inside to gain access to the color wheel. It's pretty simple. Assembly is reverse.

Oct 15, 2008 | Optoma MovieTime DV10 Multimedia Projector

3 Answers

Purplish-blue after 5 minutes of viewing ...?


I solved a similar problem by putting a small battery operated fan blowing directly into the IN vent (on the right side of unit). This completely takes care of the issue.

Now, I wish I knew what the real problem was so I could fix it...

May 14, 2008 | Optoma MovieTime DV10 Multimedia Projector

2 Answers

I have the optoma h31 projector and the color turned purple. We assumed it was the bulb and put a new one in. The color is now still not right and the picture sorta bounces


I had a similar issue with my EP739, the problem would start after about 3 or 4 minutes and then get gradually worse and worse..
The most strange thing I noticed was that white looked fine. And if you opened the configuration menu in the projector it appeared that blue was labeled green and green blue..
Some sites suggested cleaning the machine of dust, which I tried using a can of compressed air... This did not fix the problem at first.. but when I had it apart I studied the colour wheel for a little while and wondered if some how the machine was synching to it incorrectly somehow.. So I blew out the colour wheel location sensor (It's kind of obvious being the only component mechanically connected to the color wheel. Much to my delight, this fixed the problem...

So my solution to the flickering / colour fading / colour swapping issue with DLP projectors was to clean out the dust from the colour wheel location sensor..

In fact, if I did it again, I would ONLY clean the sensor, and leave the rest of the dust alone. Blowing dust around has the potential to cause other issues, especially if it winds up inside the optics system.

- Nate

Apr 27, 2008 | Optoma H30 Multimedia Projector

2 Answers

Optoma EP739


i have the same projector with same problem. i called optoma direct and ordered a new color wheel. it was relatively easy and came in about a week. the phone no. is 408-383-3710

Feb 11, 2008 | Optoma EzPro 739 Multimedia Projector

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