Question about Optoma EP721 Projector
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
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
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Posted on Jan 02, 2017
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