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Is this blue screen on all inputs (HDMI, etc.), or just on the one?
Does the remote control work, can you get the menu to display, is there any sound?
If no sound and picture, no menu etc., might be a software problem, the main PCB, or a missing voltage on this board.
If the screen went dark blue, this is the way that sets mute the video to protect the tube. However If the screen is very bright blue with possibly blue lines going through the screen, either the blue gun in the CRT has failed which is unusual but can happen or the driver transistor/IC which drives the blue gun has gone short circuit. If you know how to use a meter, you can perform a comparison check by comparing say the red O/P TX with the blue O/P TX. Ian
Flyback lines? Is the picture all white with no brightness control with faint horizontal faint lines? If this is what you are saying, the screen voltage could be bad, and if thats the case, the picture tube or the flyback itself could be bad. You could also have a bad connection on the crt socket