🚀 go-pugleaf

I have a vintage 1981 Quasar color TV which died on me recently.
Here are the symptoms: Picture goes totally black, sound goes
away, however there is a high (15kHz?) pitch hum. At first, a
slight tap on the set would get it working again. But now, I have
to bang it hard for 20 minutes before it starts up (which is
clearly beginning to annoy my neighboors).

Any suggestions from out there in net.land? I've heard rumor that
it's usually the flyback transform that dies, but I haven't got
much experience in this area...

As always, any advice is much appreciated!