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What is the make and model of TV. If it is a Panasonic that has different colored spots such as pink, blue etc. Then you need t6o contact Panasonic as this is a memory reset that they have to perform on the LCD driver board. Other brands of LCD projection sets that have spots that appear all over the screen mostly on white back rounds are almost always dust that has settled on the LCD panels. This requires a technician to clean the LCD panels if possible.
Sony guarantee the consumer to replace the optical block assembly for thousands of dollars in parts and labor every four years or when the pink and blue spots appear every time. Then replace the optical block assembly again and again every time the spots appear.
We Cleaned the optic block as was instructed by another post. But now we have a wide ribbon of light yellowish to the right of our screen. Could it be more dust to be removed or now we can see there is more problems then we thought? Over all the screen looks much better. But a far cry from when it was new.