Samsung PN51E490B4F E-Manual page 186

Issues
Others
Purple/green rolling
horizontal bars and
buzzing noise from the TV
speakers with Component
cable connection.
Plasma TV is making
humming noise.
◀
Solutions and Explanations
• Remove the left and right audio connections from the set-top-
box. If the buzzing stops, this indicates that the set-top-box has
a grounding issue. Replace the Component video cables with an
HDMI connection.
● Plasma TVs typically make a soft humming sound. This is normal. It's
caused by the electrical charges that are used to create the images
on the screen.
● If the humming sound is loud, you may have set the brightness on
the TV too high. Try setting the brightness lower.
● You can also have loud humming if the back of your Plasma TV
is too close to a wall or other hard surface. Also try rerouting your
connection cables.
● Improper installation of wall mount can create excessive noise.
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