Hi to all,
Hi Jayjaydub,
Cute! little 8" Trinitron, end of 1970s.
You're in luck! the full Sony KV-8000 service manual is downloadable for free on ElektroTanya, BTW once of the best worldwide sources for service data :
https://elektrotanya.com/sony_kv-800.../download.html
Please state your skill level in repairing vintage electronics so that we can help you.
Do you have a Volt/Ohm/Ampmeter; digital? analog?
If AC volts on transformer secondary, probably a shorted rectifier and dry/shorted filter Caps.
Once you have the Service Manual, see if there is +22V DC at the output of the main regulator board (Q901 power transistor).
See block diagram below.
The Pilot light is a miniature Neon tube powered by a voltage derived from the Horizontal power Scan section.
Keep us informed....
Best Regards
jhalphen
Paris/France