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The model indicated uses what is called a Optical Light Engine, it is a very expensive part and likely is your problem---not much else will cause this trouble.
The blue shadow is a sign of a bad light engine. this is a common problem for this model. Fixing this type of problem is quite expensive. Light engine Costs you several hundred of dollars nearly to the price of new TV set.
This sounds like a bad blue CRT (cathode ray tube) The repair on this is a major job. Beyond the tube replacement it would then require some convergence alignment and possibly some setup on the other related service adj. such as geometry. You may want to get an estimate from a reputable local repair company.
Nowadays CRT's do not have good quality shadow masks anymore. After heating up a little they can give a so called "blooming" effect giving a blue an yellow leaf effect large over the screen. Reason nonparallelity in deformation of the shadow mask.
http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull
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