What you need is horz drive from IC340 pin 11
That goes to the optic isolator IC469.
VCC for IC340 pin 10 comes from T453 / D461
Hoz drive is a must have to run the PS.
Since unloaded it seems to be doing what it should
I would suspect over voltage shutdown. Maybe test the small
transistors by lifting 2 leads for accuracy.
BTW one of our distributors made up kits for these to fix
them after lightning. Worked 100%. IIRC had an isolator,
4 small transistors & a diode.
The similar C3 chassis had a lot of bad FBT's Symptoms
were dead set, HOT gets too warm, R460/461 get warm.
73 Zeno
LFOD !
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