NotTaR of Television Sets : Herringbone lines in picture            
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Herringbone lines in picture

(From: Isaac Bergen (isaac.bergen@sympatico.ca).)

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.