SOURCE: Picture issue
Hi,it sounds like the LCD chips that create the image and colors.These chips are green,blue and red.These chips are like tiny screens that blend together to create the image and colors.Over time the LCD chips start to melt and those spots will appear.Unfortunately they dont sell the chips by themselves so you will need to replace the light engine which cost sometimes as much as a new tv.Good luck and God bless you!
SOURCE: Hitachi projector model CP X260 projects yellow spot on screen
blue blotches on screen due to dust get optics cleaned should then work ok...yellow spot more likely to be lcd or lens burn a much more serious and expensive problem
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