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This is strange. However, I think JH may have the answer. If only blue were black, it'd obviously be that the blue gun's heater had "burned out", or it's amp, connections, etc. had "broken." But to
get white at any time means you've got the blue "working." So you may have a short in the cable. Though I can't immediately see how a combination of shorts and opens will give your result. When it
was flipping (yesterday), were you moving anything? I fear that it's not simple, and is in the RGB control circuits. Forget about degaussing - bring a magnet near the screen and you'll see that a
magnetized mask produces a completely diff. effect.