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Unable to Pinpoint Flickering Source on DLP LC4500

Hi, I am experiencing flickering on my device with some images, and I cannot pinpoint the exact source.

All images are black and white or grayscale, presented from PowerPoint, and carried to the DLP over HDMI directly from a graphics card.

I have not been able to find a correlation between image resolution, bit depth, or black-to-white ratio (average brightness).

I can post some of the images I am using if that would be helpful.

Thanks for any ideas you may have!

NR