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The tv problems and causes are 100% is the tv colors wheel it is causes and the tv problems.The tv are having humming or loud buzzing noises sounds are the causes of the tv colors wheel going off and out control of it motor mount and spinning in at high RPM speed and different colors showing up or flahes of black and white color in the tv back ground.The tv colors wheel must have to be replace.Best hire a tv tech to do the replacement of the tv colors wheel,because have to take out many mechanicals parts before can even come to the tv colors wheel is self to replace it.
There is a excellent chance it is the Color Wheel in the Optical Block. Some of the older models are not too bad to replace it, on the newer one though it is a major tear down. I would have a RCA Servicer come out to verify and get a estimate. Chances are do to the cost of Optical Block, it would be close to replacement of the Set.
Hope this helps,
Skyassoc
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