A photo may tell what the problem is---do you have the same trouble with a DVD etc playing? Faint lines moving bottom to top could be a bad cable lead with a poor ground(shield) If it never does it with a DVD thru one of the rear inputs--suspect a problem with a cable wire connected to the set.
screen has a double image. looks like the green gun is bowed at the top and bottem of the screen....
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screen has a double image. looks like the green gun is bowed at the top and bottem of the screen. hitachi 50ux58b