Question about Optoma EP739 Multimedia Projector

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Ep739 purple i have the same problem you do, the projector is brand new! is it possible theres dust in there even though there was 0 hours on the bulb? if so how do i go about finding the area to clean that you described?

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5 Suggested Answers

  • 2 Answers

SOURCE: 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.

:)

Posted on Nov 27, 2008

  • 22 Answers

SOURCE: 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 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...

Posted on Jul 22, 2010

  • 1 Answer

SOURCE: Dirt(dust/hair) in projector optoma hd65 effects pictur quality

I had this problem before, i took a my household vacuum to all the vents on the unit and it freed the dust up. if your vac is very prowerful you may what to muffel it some how.

Posted on Feb 23, 2011

heathgr
  • 442 Answers

SOURCE: How do you clean the dust out of the projector,

If you focus the image on a screen up close to the projector and notice small rectangular black and white spots, then you have pixel failures.

Posted on Jul 11, 2011

markovid
  • 26 Answers

SOURCE: How do you clean the dust out of the projector,

You can't clean the white dots this are litle mirrors on dlp chip that remain to be closed thats why you only see the white dots. You need to replace the dlp chip.

Posted on Jan 22, 2013

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The lamp exploted in less than 30 hours of use, replaced an exploted in 4 hours, replaced and exploted in 5 minutes what can I do?


Is it the correct bulb? Or recommended bulb? Try a higher wattage or lumens. I'm not sure what the lamps in the projectors are called, but check on the wattage and lumens.

Dec 07, 2014 | 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

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 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...

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

Our PJ-TX10 projector is turning itself off


First, to rule out true overheating, clean any dust filters and air-access areas. There might be enough dust on the filter to cause a gradual build-up of heat which could trip one of the temperature sensors in the unit. I clean my projector once a week--There might be a cooling fan going bad--after a while, heat causes the fan motor to start to drag and slows down the air flow. Also, there might be a temp sensor that is shutting down the unit prematurely.--Rick

Sep 06, 2009 | Hitachi PJ-TX10 Multimedia Projector

2 Answers

Everything/everyone is purple on a H31 optoma pic


Hi, genelewis! Well good news for me, and also hope for you; I got my projector to work correctly again, at least it has not had the problem for a couple of days of probably 10 to 12 hrs use of movie watching, before it could not go an 1hr without the purple issue.

I was looking at other sites and this one with other projectors and it sounded like just dust in the projector... after just about 3 years now without a cleaning I think it needed some maintenance, so I carefully took the bulb out (1 black screw on the bottom) and opened the projector (7 metal screws in total), and after some investigating on any wiring that may interfere (only on the inside back of the white top cover, were the inputs are: a wire band and some small metal sheets that kind of grab the top) I pop the top, not that hard.

After that I just carefully used a can of compressed air to blow away from the projector any dust I could reach and in some of the crevices I saw, being careful were the mirror is (were the bulb was); I was tempted to get the glass that covers it off to get some dust off but the screws are small and kind of hard to get out, so I left that alone. Cleaned any dust accumulated on the air intakes with a clean soft cloth and closed it up again. I did not want to touch anything else unless this did not work, but this did the trick! I'm happy with my H31 once more.

I hope this helps you, good luck. Let me know if you need some more details

Nov 25, 2008 | Optoma H30 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

1 Answer

Powers off and lamp never comes on (new lamp tested in other ep739)


The lamp might be burn out or you do ot have the computer in the right plug and the right input slected.

Jul 23, 2008 | Optoma EP739 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

Projectors.


Hi there

You can get the full users manual for the Optoma EP739 on www.projectorcentral.com

Mar 19, 2008 | Multimedia Projectors

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