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could be a number of things-lens film/cover "cloudy", lamp dimming, defective optical block, etc - this tv is garbage! we finally threw ours out for garbage - two lamps exploded at $100-300 - replaced the optical block twice-garbage is all I can say - I expect to buy a tv at 4K that would last many years without distortion to our eyes, the expense of it all and total inconvenience-dealing with warranty bs etc - never owned a tv that was so much trouble!
Most of this is personal preference---if contrast (picture) is set too high the picture will have some smearing on dark or even very bright scenes--try to have that set at about 70% and brightness just a bit higher---a proper setting of the two will give a better picture with more clarity. Color and tint to preference and sharp to not full smooth (mid-range)
Other than these signal provided accounts for clarity--pixels stopping etc is not the set but the signal provided not fast enough to keep up----cable and sat often jams a lot of info into a small space and that sort of issue results.
If you have a HD quality Blue Ray compare it to your signal source and usually it will look much better.
I have taken the time to cover as many bases here as possible.
Although you may want to keep your television unfortunately your pixels die. However you may try raising the tint on the television manually (It is usually a knob on old television sets), and maybe that will lessen the effects.
it sounds like a lot of dust in the light engine lens.usually pixel defects are purple or black...question is your set a lcd or a dlp format? and how large are the dots. if real tiny it will be dust. if large it will be insects... have a qualified serviceman take a look.. good luck...
no picture condition could be caused by a problem in the horizontal deflection circuit or a power supply failure. A horizontal deflection problem often are followed by open fuses due to shorted components such as a h.o. transistor ofcourse there are a lot more componentd that constitute this circuit. Another no picture condition could be caused by defective convergence power amps. these amps usually give an clear indicator when they are about to quit(color curved or missaligned, double color images etc.) this is a common problem with projection tvs and that is where I would tell the tv tech to start looking.
yes it is noy pixal oil it is CRT coolant there are several companies on-line that sell complete collant replacement tvrepairkits not to hard to do with the directions given and a lot of times the sets look as good as it did when it was mnew!!!!!! Good Luck Larry Dillon