AVS Forum Special Member
Join Date: Aug 2017
Location: Working in China, home in Portugal.
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my first guess is that there may be some faulty contact between the mainboard and the DMD chip, or between the mainboard and the color wheel, and that this faulty contact becomes increasingly worse as the projector heats up. Still, it's just a guess. You already tried different HDMI cables, but I would also try using the projector without any cables connected. If this issue occurs with just the projector menu, then you can completely eliminate an input problem. Sometimes, this can be fixed by reseating the cable.
My second guess would be that there is a mismatch between the internal signal and the color wheel, and, depending on the cause of this mismatch, it may or may not be fixed through the service menu.
4,3 x 2,8m semi-blacked out media room | 2010 MacMini > Pioneer VSX-520-K > JVC RS50 (X7) > 107", 1.1 gain, white screen | JVC X30 (RS45)