Green line on Panasonic widescreen TV in RGB mode

Hi All,

Hope someone here can help - I've had a quick Google and failed to
turn anything up.

I've just bought a Panasonic TX32DT4 widescreen IDTV. I'm on my second
one - the digital tuner in the first one was faulty and kept crashing.
(So far, the new one seems fine.)

The new one, however, does have one small fault that I don't recall
noticing on the old one. I keep the set switched into 4:3 mode, as I
can't stand the distortion of 4:3 pictures for widescreen. This means
that a widescreen signal from DVD or the digital tuner automatically
switches into widescreen, but that everything else is rendered in 4:3
with black bars at the left and right sides of the picture.

This is fine when using the integrated analog and digital tuners, or
composite signals through either of the SCARTs. However, when I use
AV1 to display an RGB signal from my DVD player (Pioneer DV656) or my
PlayStation 2, I get a single green vertical line at the left edge of
the 4:3 picture. This is only a problem in 4:3 mode - if it is there
in widescreen, I presume it is off the left hand side of the screen,
so I can't see it.

If I turn the brightness down from the default settings (100%
contrast, 50% brightness) it goes away - I have to turn the brightness
down to around 30% to get rid of the line. The picture is still
watchable like this, but it is considerably darker than recommended by
the THX Optimode test patterns.

Is this something which is likely to be easy to fix, or is it some
fundamental mislignment in the set? I have tried changing some of the
settings in the service menu (only the ones I understand!) and have
had no luck getting rid of it - this isn't helped by the fact that
whenever you access service mode on the Panasonic, it switches into
widescreen mode to display the service menus, so you can't see the
line anyway...

Any advice gratefully received!

Many thanks,

Simon Long