Samsung UA40ES7 E-Manual page 672

ΠIf you're using a component
connection, make sure the
component cables are connected
to the correct jacks. Incorrect or
loose connections may cause colour
problems or a blank screen.
There is poor colour or brightness.
ΠAdjust the
TV menu (go to
Brightness
Picture options in the
Picture
/ Sharpness)
/ Colour /