Question about Optoma EP721 Projector

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My optoma works well with the PC laptop, but doesn't project the colors right on Mac. We are mostly transitioning to Mac, so we do need to find a way to make it work. I played with the colors, but it doesn't solve the problem. Does anybody have the same problem with colors? How to fix it? It becomes too dark to watch otherwise...

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  • eyzil1 Aug 28, 2010

    I doubt it is the cable because the cable works with the epson projector. It is with Optoma that it doesn't work with colors. So you're saying I should check the video card, but on my laptop and on epson projector colors appear normal. It is on Optoma that they appear too reddish and dark.

  • eyzil1 Aug 28, 2010

    I have two separate macintosh laptop computers that work well with epson projector. But on Optoma, colors appear two reddish or dark. Optoma works well with the windows operating macintosh computer. So the problem is not the video card, since on the windows mac it works fine. Can you suggest a solution? Thanks.

  • eyzil1 Aug 28, 2010

    Thank you so much! I will find out the answers to these questions and will get back to you in a few days. Thanks again.


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Well it seems you are not the only one with this problem. the question really lies in what input are you using. Are you going from say a mini-dvi port on a macintosh or a vga to vga. or are you using the s-video input. This can actually do with the digital video output of the macintosh. After searching our experts database and many forums including apple forums with the problem this spans on a whole series of optoma's Although it does says its macintosh compatible. It may not be more or less compatible with a different connector.
So things to try. If you have a macintosh with s-video try that. If the s-video is the problem. Then try vga(depending if its vga out on the mac)-vga or if its mini-dvi to vga. Honestly it sounds like its either going from dvi-vga or dvi-vga. As from the Macintosh forums thats the most i saw with these models. But try different inputs until one of them displays the correct video mode. I have read people that said they corrected this problem by using a vga output on a g4 then using a dvi-vga adapter and plugging the vga cable into the projector. After hthat they had clear 800x600 native resolution on the projector. This may sound a little confusing. But just cause something works on one projector by another manufacturer doesnt automatically mean this will. So try to use each input and see if that corrects the problem.
Personally id like to know what output to input you are currently using. At what refresh rate and resolution.
Please let me know if you are able to try a different input on the projector and if so what happens. If you can provide me with that information i will be glad to assist you further. Thanks Midwest-tek

Posted on Aug 28, 2010

  • Nathan Ayers
    Nathan Ayers Aug 28, 2010

    No problem just let me know and we can help assist you from there. - Midwest-Tek


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If you tried all the settings on the video card in the Mac ..and it made no changes..than the issue might be from the conversion cable from the DVI to vga..if you use an adapter cable ..and not a direct dvi to vga ..try to change it maybe it is the issue ..
anyway ..first try to adjust the image by defaulting the settings into the video setting of the Mac ..but the idea with a defective or ..wrong pin-wired cable is still on ..and worth trying ..

Posted on Aug 28, 2010

  • Catalin Turcu
    Catalin Turcu Aug 28, 2010

    I only sugeste dto change the settings on the video card from the Mac computer ..cause is it work in another projector it means the cable is ok the issue is the settings ..Open the video settings in Mac os computer ..and change the brightness the color management or the hue in the video card settings on mac...It is just a issue of signal and the range of the frequencies that the 2 projectors work ..Probably the Optpoma supports different the signal out from the Mac OS..thats all..and if you will use it permanently will have to change the settings..My money will be on a little brightness and to change the HUE settings ..and will be ok ..go to system preferences..and displays panel ..and see what settings are available ..


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