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All tube TV's have degaussing cct's wired to the on/off switch. If you use the standby all the time the magnetism has grown over time and it is usually harder to remove immediately. So a few on/off's from the switch maybe needed. The degaussing cct's is simple and relies on a thermister (temperature controlled resistor) to switch the degaussing off once it has warmed up. Hence the reason for switching off for long periods.
Blue screen is usually loss of signal from the antenna or set top box. It sees the video sync pulses to determine a signal so the blue screen can occur on the tuner and the AV inputs.
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