probably kicking back off due to excessive voltage or something to prevent
to much xrays, you may get it to come on by forcing relay closed but you
may zap a few parts also, check flyback and pink wire to tube for signs of
arcing. if all else fails just examin all to see if something has become
toast, if you are going to force relay on, i hook a lamp in a series with
it to take some of the current away from it, if bulb lights fully when tv
turned on , then u probly have a voltage regulator short, other wise if
the tv tries to power on and the bulb glows dimly you can try to hard wire
the relay, but disabling protective devices on a set is never a good idea