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This doesn't appear to be a known issue, so my view is that the remote has just failed. Try the smartphone forward facing camera trick to see if the remote is producing an output signal.
The projector looks for Horizontal sync & Vertical sync signals from the VGA source. If it finds these signals only then the source is connected. Even if the sync signals are found, the RGB switching should be working. Either there is a problem in sync circuitry or RGB switching. You need to be well conversant with the circuitry.
first of all, the infocus lp 790 is an lcd projector, not a dlp. second, the light filter in front of one of the lcd panels is burnt, and unfortunately cannot be purchased separately.
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