I just fixed my 27" JVC set with the exact same problem by using the =
following procedure (I assume you are familiar with safety procedures =
when working inside a TV, if not, read this first: =
http://repairfaq.ece.drexel.edu/sam/tvfaq.htm#tvsaf ) :

Look at the picture tube socket. If there is a small deflection board =
there, check the solder connections. Trace the wires back from the =
socket/board to the chassis. Look at the printed screening on top of the =
PC board, working outwards from the vicinity where these wires connect. =
If you're lucky you will see something referring to the vertical output =
section.

Look for a large chip or transistor nearby - probably mounted on a heat =
sink (also look for any big power resistors). Check around the pins of =
these components on the PCB for hairline cracks in the solder. If you're =
feeling brave, you could also power the TV while prodding these =
components and the PCB with a long well-insulated item like a wooden =
dowel, but be careful !!

For more info, see:

http://repairfaq.ece.drexel.edu/sam/tvfaq.htm#tvsinghli


"Anonymous" wrote in message =
...
Sony KV27TS20 Picture becomes a thin horizontal line - Vertical =
squashed.
=20
I have a 1989 Sony 27" color TV. After about 10 minutes of viewing the
picture becomes one horizontal (thin) line, everything else is ok. If =
you
hit it several times in one specific area, it goes back to normal =
veiwing,
and then intermittantly goes back to the vertical line.
=20
I did some research on the net and one possible cause is a "bad Solder =
In
Vertical Output Circuit" I don't have the schematic and don't know the
location of the circuity, any help in finding and correcting the =
problem is
appreciated.
=20
Thanks !!
=20
=20