Question about Optoma H79 Multimedia Projector

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Picture is flickering and picture distorts

I have an Optoma h79 Dark Chip 3 projector and after 700 hours of operation with a new bulb the highlights start to flicker like ligtening. I can turn the projector off and after cool down time I can restart the projector and all is fine for about 10 minutes thenthe color startsto distort and then the flashes in the highlights start again. Then the whole picture distorts almost like a negtive. Can any one help me I know it is a heat related problem but I can't find and online manuals to help dissassemble the projector, any one have access to service manuals or run into this problem before. Thanks for your help!!

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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dhiman
  • 115 Answers

SOURCE: EP 757 Intermittent powering down

Pls check if the lamp is not so old that is giving the same problem. If lamp is almost new, then you can have a check with the Ballast unit card and then the loose connection in the Power supply or may be overheating and tripping.

Viren

Posted on Nov 19, 2007

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  • 3 Answers

SOURCE: color problems

i don't know if this will work but..... I have an Optoma h27 and we were having problems with the color and ours is mounted on the ceiling in inverted also; and after two years we started having color problems, come to find out that on the menu there is a option for high altitude and that had been turned to the "off" position (probably by our kids resetting all the options and not turning this one back on)..... after taking it to a tech that cleaned it for $97.00 and said there was no problems he could find, we played around with the remote/menu and came across this high altitude option and when we saw it was on the "off" position, we put it to the "on" position and another fan inside the projector came on and that helps to keep the inside of the projector cool at all time and helps from the color becoming weird..... Try this on yours and hopefully that will solve your problem.

Posted on Dec 22, 2008

  • 6 Answers

SOURCE: HD 70 DLP Projector problem

Hi, My name is Doug Stanko.
I had the same issue and fixed the problem.
All you have to do is take a few screws out..... and blow out the inside VERY well with pressurized air. I have a compressor... and I set the regulator to 50 psi. But the KEY IS TO have the covers off so you can get between the circuit cards and blow them out. They were incredibly dusty. Even after I blew through the side vents.
I agree with all of you that say it is overheating. You are right. There was so much dust on the fan blades them selves... I'm suprised they were still spinning at all.
And like most of you... first I bought the $300 dollar bulb... put it in and 10 minutes later it was doing the same thing flashing through the colors. So trust me.
There are 4 screws on the back. Take these out.
There are 2 small nuts on the back around the VGA input. Take these out.
There are about 5 screws on the underside (think one was on the bulb changeout portion). These have long copper colored bars that go all the way from top to bottom.
All these have to be removed. Then you can take it apart. AND I PROMISE YOU WILL SEE TONS OF DUST ALL OVER.
Make sure you blow out the parts between the circiut boards AND the fan unit.
Put it back together... and remember to make sure that little latch on the bulb change cover makes the click sound ( it is a switch that must close or the unit will not power back up )..... and it will work great again.
No need for a huge fan next to it. Although I will admit that is an excellent idea.
I did this 3 weeks ago and have been watching it with no issues.
If you do not feel comfortable taking the screws out yourself..... I would take it to your local TV repair store and just ask them to take the covers off and blow out all the dust... and give it back to you. No troubleshooting... no repairs... no replacements... just blow it out.
I was an electronic technician in the US Navy for 10 years... Now I work at a nuclear power plant in Illinois. BUT I PROMISE with a good phillips head screw driver and a small crescent wrench you can do this yourself.
Good luck and you are welcome. I know how frustrating this issue is. But this is the fix.
Doug

Posted on May 13, 2009

  • 1 Answer

SOURCE: I have optima projector and started flickering,

I have solved the problem (running fine for 10 days now)
I was planning to replace the bulb, but after reading the different posts, i understood it was NOT in cause.

i had to open the projector, remove and clean every part :
- the motherboard
- very dusty alim parts (radiators)
- the big fan blades (i used silicon lubricant for the rotor)
- the optical block
- the TINY RADIAL FAN IN THE OPTICAL BLOCK (very hard to clean)

advices :
1/ take pictures of what you're doing
2/ tape well the folded plastic and aluminum parts to avoid light leaks !

Posted on May 14, 2009

  • 1 Answer

SOURCE: Optoma H56 - turns off just after start up.

It's not a short, the blub is near the end of it's life ~ the optoma is designed to detect when the blub is about to blow and shuts itself down. Turning the projector upside down or right side up usually only gives you a brief reprieve (some have reported a modest amount of extra time gained) on the blub ~ but in the end it's on it's way out and the projector will shut down again.

Posted on Jun 06, 2009

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