(From: Isaac Bergen (firstname.lastname@example.org).)
|NotTaR of Television Sets : Herringbone lines in picture
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Could be interference. If the pattern slowly moves up the screen, the
problem is from the 60 Hz power. A line of dots or thin lines usually
means corona discharge (arcing) from a nearby power line (especially on
humid days). Could also be from a bad filter capacitor in the TV's power
supply. A "checkered" pattern could be from a digital type noise source
like a computer, etc. If you move the TV to another room and the
interference changes, that's probably it.