Samsung 650 Series User Manual page 121

A black dot or a bright dot appears on the screen
One or two pixels may appear bright or dark because of a technical limit
during the manufacturing process of the DMD built in the TV set.
This doesn't affect the performance
of
the TV.
Cleaning the screen
Unlike a normal CRT TV set, this TV set uses the screen made
of
acrylic type
materials. To protect the screen, wipe the screen using a soft, dry cloth.
• Do not use wax, benzene, alcohol, thinner, insecticide, aromatic, lubricant,
cleaner, etc.
Viewing location and a long-time viewing
If you view the TV for a long time, view at a sufficiently good distance.
A normal projection TV has some difference in the extent of a good-viewing
according to the viewing location. The proper distance is five to seven times
the length of the screen. In case of HD broadcasting, view the TV at a
distance of about four times the length of the screen. If you view the TV at a
short distance for a long time, your eyes may be fatigued.
BP68·00079A-D 1