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Is a blue screen only on a TV a sign to get a new one?

Nothing was adjusted or touched after use one evening. The next time the TV was turned on a blue screen only was on the screen.
Rick, September 2005
fixing the hues on a sony KV-32S45

Elaine, October 2007
Some TV's display a blue screen if there's interruption to the aerial signal & are designed to show a clean blue screen instead of just snow.

Toshiba & Hitachi are two examples of manufacturers using this feature.

Usually the blue screen feature can be switched off from within the TV's user menu. Although you may still have to find the reason for the lost signal.

Check disconnection of power to external equipment eg. video recorder, decoders or aerial amplifiers, as the signal is usually routed through them before reaching the TV.

Otherwise, a blue screen can be due to a fault in the TV.
As simple as a cheap resistor up to a short circuit inside the cathode ray tube, which would be very expensive. Usually but not always, a short circuit inside the tube will be accompanied by flyback lines in the picture (very thin, faint white diagonal lines, spaced about an inch apart).

Check your signal input first.

Cobweb, September 2005