Trinitron Horizontal Flicker

[zeno]

You may have to slap it harder ! Still look for cold joints on the
hoz drive transformer. After that the hoz out & flyback area.

Cold joints on the H drive are common to most brands for many years.
when working on ANY set from the mid 70's on always resolder them.
If they keep up you could blow the HOT & power supply.

Your problem is very subtle so if its not a PC con it will be very hard to smoke out. You may have to wait for it to get worse or fails first.....

Good luck
73 Zeno
LFOD !

[Outland]

Okay, thank you.

I am not experienced with electronics repair. Is there a book to get me up to speed?

For example, I think I know what a cold solder joint is (an intermittent connection due to cracked solder), but I do not know how to look for it or repair it. Perhaps it would be best if I practice on something else first.

This looks like a good starting point.