could be a dry soldering joint on the vertical
circuit, look for bad or cracked solder and resolder it.

"Doug Greenberg" wrote in message
...
Hello,
We have an elderly JVC 27-inch tube-type television, Model AV-27BMS (I
think). It's been a good TV for 13 years now (manufacturing date is
January 1995). In the last few months, however, it has developed an
annoying problem. The picture periodically shrinks down horizontally
(that is, the screen turns dark above and below, and what's left is a
thin, squished-down picture perhaps three or four inches tall).

If someone bangs lightly on the side of the TV the picture returns to
normal--for a while. But the problem doesn't go away and it actually has
gotten worse.

Any ideas of what would cause this, and just as important, is this a
problem that likely can be fixed for significantly less than the price of
replacing the television? Bringing this heavy sucker to a repair shop
would be no pleasure, but if the problem seems manageable, by gosh I'll do
it.

Doug in Berkeley