My 57inch sony projection tv has a picture but than turn all blue with in minutes with no picture?

My 57inch Sony projection tv has a picture but than turn all blue with in minutes with no picture?It just turns blue but still has volume. I can shut it off for a while and the picture comes back but then it does the same thing.

Answer:
If its a 2000-2003 Model then its prolly the picture tubes. Sony had a bad run of them in that time.

Its usually the blue and the green.
picture signal went missing. I don't think this 's the CRT problem. Check your input source first i.e. cable, DVD, etc.
I nothing wrong with the input than the problem comes from inside your TV, this one need an expert, so call the technician.

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