Samsung UN46ES7500FXZA E-Manual page 279

ΠThe
3D Mode
configuration value automatically
when you change the input source.
ΠSome
in 3D mode.
Œ
PIP is not supported in
Π3D Active Glasses from Samsung'
s previous product (IR type) or other
manufacturers are not be supported.
ΠWhen the TV is initially powered on,
it may take some time until the 3D
is set to its memorized
Picture functions are disabled
3D mode.