Your horiz output is normal checking the way it does. My guess would be the
flyback. I don't how how good your Fluke meter is, but on mine I can set it for
AC volts and read off the collector of the horiz output. Should be aprox 300v
rms. If this voltage is there when the set is turned on, but no or low high
voltage, the flyback is most likely bad. Also try unplugging the CRT board and
the yoke, and see if HV returns. A shorted yoke or a CRT with no vacuum can
cause this problem also.