Sounds like maybe your color wheel needs to be replaced. If you have noticed a humming noise in conjunction with the intermittent colors, then that is most likely the issue.
My 51" Vivitek started to hum loudly about 2 months ago and I kind of ignored it ,but it got so loud and annoying I had to do something.First changed the bulb and then bought a color wheel at
www.vancebaldwin.com .Login as guest and then enter your model number into corresponding box.They have a few Vivitek parts.
I replaced my color wheel myself and it works great!
I'd be happy to help any way I can.
Good luck!
depending on the backround color. i have a big spot in middle of screen.Blue backround, green spot. White backround, yellow spot
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