JVC AV-48WP30 started displaying vertical lines...

Recently, my JVC AV-48WP30 started displaying vertical lines every inch or so from the top to the bottom of the screen.

They're very, very narrow (about a "pixel" wide, if you will) and affect every input on the unit, including the DVI, component, TV (RF), and S-video inputs.

They "modulate", in that they change color, slightly, and intensity, almost like an amplifier or transistor is "clipping". Mostly, they appear white on dark backgrounds and vice versa, and the lines are not solid top-to bottom, but rather like some pixels are on and off in each line. They do not shift side to side at all, and always run full top to bottom.

They do _not_ appear on the onscreen menus, however, only on the tv signals.

I have _no_ idea what could be wrong, however, and no idea as to where to start looking. Any help would be most appreciated.