Question about Optoma HD70 DLP Projector

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Replaced lamp on optoma hd70 unit will not power on

The unit started flickering colors and then went out. the lamp life was over. We replaced the lamp but cannot get the unit to power up.

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  • Anonymous Feb 03, 2009

    Replaced Optoma hd70 Bulb because old lamp expired. Now i have another problem, it seems no power is getting to the projector, there are no lights coming on or anything. HELP!!!!!!!

  • ngillespie Feb 07, 2009

    I have the exact same problem! I replaced the lamp on my Optoma HD70 and now the power will not come back on.

  • joelmac Feb 08, 2009

    same problem here... changed bulb now no power at all!

  • kasian Feb 13, 2009

    Should the switch be pushed forward by the tab on the cover or should it be pushed away from the lamp?

  • kasian Feb 16, 2009

    I actually removed the tabs on the side that you insert before closing the cover. This allows you to slide the cover on from the side which pushes the metal tab over. Now it works great!

  • Anonymous Apr 26, 2009

    omg...thank you so much!! we thought it was broken for good!! thanks for your help!!


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I had the same issue.
Take the bulb cover off and hold it just above the unit. notice how that part that sticks down has a little curve to it. The curve is designed to gently push that little metal wire as the cover is lowered.
If you take a small toothpick and exercise the little wire in... NOT DOWN... you will hear a small click. That is the switch making contact. When it makes contact and clicks... and you plug it in the green light will be on again... and the unit will work fine.
You do not have to take the tabs off.
Just exercise the switch... put the cover on slowly... be very quiet and you can hear the click sound.
Plug it in and you are good.
And if the color starts to flicker on and off... it needs a VERY good cleaning... not a new bulb. Read my other posting to the guy with the fan picture.

Posted on May 13, 2009

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I figured it out. The above posts are right, the problem is the little metal switch that the tab on the cover is supposed to move. The problem is that the tab is not designed all that well so it ends up pushing the metal switch down, instead of the left. You will notice that the cover has a slight bump in the middle when closed if the switch is not engaged properly. The cover should be totally flat and close all the way without having to told it down. And it should go easily without having to push it down.

To get it in properly, I don't recommend breaking off the tabs like someone above suggested. Instead, put the cover on and when lowering it, you have to kind of wiggle it back and forth from left to right while slowly lowering it. You will feel the switch move out of the way and the cover should close nice and easy and snug; compared to when the switch is not engaged properly as I described above.

Hope this helps, I have light now!

Posted on Mar 05, 2009

  • techQuility Mar 05, 2009

    P.S. My friend has the same projector and his didn't power on even after properly closing the lid. Maybe because the switch is now slightly bent from being pushed down incorrectly by the cover.

    If you move the switch with a toothpick, you can clearly hear a distinctive click of the switch. When lowering the lid and wiggling like I dexscribed in my first post, you should hear that same click of the switch. On my friends HD70, that click was not happening when closing the lid. We had to use some paper and basically jam the swich open. Make sure to leave room for the tab on the cover so that it doesn't push your paper out of the way.

  • amendineduc
    amendineduc Dec 09, 2012

    thank you from Paris!!! it's a perfect solution!!


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I just replaced my Optoma HD70 bulb and had the same problem. No power at all. When I removed the outer door covering the bulb (thinking I had seated it incorrectly) I noticed a small tab sticking out. This tab on the cover has to strike the switch next to the bulb. It looks like a little wire where you plug the bulb in (it is opposite of the front of the projector). If the tab doesn't hit this switch the projector thinks you are trying to run the projector with the cover off. 

Posted on Feb 13, 2009

  • MikeDeLorey Feb 13, 2009

    If you look at the tab on the cover you will see it is slanted. It looks like it is closing the switch by moving it towards the back of the projector.

    Since you can't 'see' what is happening when you put the cover on it is sort of a hit or miss operation. 

    You may want to make sure the switch is not damaged. You should be able to move it with a small screwdriver with the cover off to verify the direction the switch will move. 


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I used a matchbook cover to keep switch moved over and all is fine

Posted on Feb 16, 2009

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