Question about Optoma EzPro 739 Multimedia Projector

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Installed new color wheel not working correctly

I just installed new color wheel in my optoma EP739. eveything works except my color is off. no warm colors are present such as the reds and yellows when i try to adjust the color. my picture is mainly all blues and greens. any helpful advice on this troubleshoot would be appreciated

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  • Anonymous Mar 28, 2014

    Colour wheel broke, ordered a new one, replaced it...and now the colors are inverted (red is green)

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Hi danny,

I also replaced the color wheel in my EP739 after the old one disintegrated suddenly. Colours were then all over the place. Actually, it looked like each colour channel was displaying all the colours of the rainbow!

Here is the procedure I used to solve the problem - maybe not as elegant as Marrie's solution, but it will not cause any damage, will most likely solve the problem, and you will be able to get everything back to the way it was if it doesn't work:

  1. Have the projector running and displaying a stationary picture. The right sort of picture to use is one that has a full range of brightness values from near-black to peak white. I used my lap-top as the source. Also, this way you can compare the projector's picture with the picture on the lap-top.
  2. Press the power button once. "Power off the lamp" dialogue box appears. Hold down the left arrow button until the service menu appears (takes about 8 seconds).
  3. Using the up/down arrow buttons, scroll down to "Color Setting" and press "enter".
  4. Scroll up to "Color Wheel Index". Make a note of the existing setting for later reference. You can change the Index setting over a range of 100 to 550 by holding down the left/right arrow buttons. As the setting changes, the colour rendition will slowly change, and at some point the colours will come right. Note that the changes are quite slow. Find the lower and higher settings where colour aberrations just start to appear, and set the Index mid-way between.
  5. If this doesn't fix the problem, return the Index setting to original. My original setting was 354 and the new setting was 461.
I do not advise touching any other settings in the service menu unless you have access to a service manual and know what you are doing.

Good luck!
Father Dave

Posted on Feb 22, 2009

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Hi there

You should restore the balance of the runrate on each colour in the service menu.

If you are not familiar on how to do this , rather have a professional do it for you.

Posted on Mar 26, 2008

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My monitor color suddenly changes to a greenish color.....If i shake the monitor,the colour will be rite for 5 min and again greenish color will appear...I am suffering this after a magnet is being placed in font of my monitor.Can anyone help me.I am suffering this problem for the past 6 months....I do not have degauss button in my monitor.....Its very old colour monitor

Posted on Apr 08, 2009

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Posted on Jan 02, 2017

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