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Your TV is not getting any signal at all to process, or the tuner inside your TV is faulty. Blue back screen comes, when there is no signal to any of its input or faulty tuner. Just connect the tV with any other video source, like VCR or DVD , connected to its AV terminals and set the tV to take input AV, and check whether picutre comes in or not. If picture comes with AV connection, make sure that your tVs tuner is faulty and should be replaced. If no picutre comes with AV connections too, the Chroma Ic insie your TV is faulty, and should be replaced. OK.
The problem could be the power supply, the flyback trasformer or simply a bad connection. A repair cost for this TV set could run any where from 75 bucks all the way up to 225 or so, depending on the problem. Good Luck