Vertical lines evenly spaced across the screen.

I've got a JVC AV-48WP74 48in TV. This past week, evenly spaced vertical lines have begun to appear on the screen and steadily get worse. The color of the line seems to depend on the the color displayed on screen. Sometimes they are white, sometimes they are grey, sometimes they are black.

Would this be a bulb issue or a board issue? And if it is a board issue what's the best place to look for repair instructions?