On Sunday 27 April 2008 20:52, James Sweet wrote:

Don't be so quick to condemn the CRT, sure it could be at fault, but
eliminate the external stuff first! A bad connection on the neck board can
just as easily cause the same symptom.

But won't a bad connection give me a black screen, because when the cathode is
disconnected from it's line, no current can flow. How can the blue cathode be
shorted to ground on the neck board? I can't see anything (obvious) on the
board that could cause a short.

BTW, I thought the RGB guns had separate line wires, but besides the focus and
grid voltage wires, only one extra thick wire runs to the neck board. That has
to be the cathode line voltage, right? And if so, doesn't that mean that when
it's shorted to ground, all the guns are fully turned on, and not just the
blue one (as is the case here)?