Zenith shut down

[Golf]

Model #B25AO2Z - Set attempts power up as seen by horizontal flash on
picture tube but never comes up. Hitting the power button repeats the
symptom. I was guessing this may be in the horizontal section so Iv'e
checked several caps in the area, but haven't replaced the HOT since it
checks good and I don't have a spare. Nothing found bad yet. I do not
have the schematic but was hoping someone here may be familiar with
this set and symptom, and path forward. Thanks group, still a beginner
here.

 

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If you see any light or flash on the screen then possibly the HOT and
the circuitry around the flyback is OK. It is possible that the
television is shutting down as a result of x-ray or HV protection being
triggered because of B+ regulation problems. Check the raw
unregulated B+ rectifiers and filter then check the regulated output
for ripple and regulation.
electricitym