This sounds like some components in the vertical deflection area have become
intermittent, or thermo sensitive from age. The set is fixable by someone
who is properly trained, has the service manual, and the proper setup to
In the set, there are also some software criteria's with the EPROM, and the
internal software. There are times, when this is a problem as well. In your
case, it may just be some parts that have to be determined, and changed. It
would be a wild guess to make an exact recommendation.
I saw that someone was talking about the flyback. This has nothing to do
with the vertical compression fault! Most of the time, a defect in the area
of the flyback will effect the high voltage, focusing, and maybe some width
I strongly recommend, you give the set out for proper service, rather than
tear in to it yourself. There are some very serious safety concerns, not
only with the high voltage, but also with the main voltage distribution
within the set. Also, there is the responsibility for safety hazard concerns
when changing parts, and make soldering on the circuit boards.
I have been in the TV service business for a good part of my working life,
so I know what I am talking about. On a number of occasions, I have seen
customers injured badly from trying to service their own sets just to see if
they can save a few dollars.
Click to see the full signature.