Sony KDL-50W706B Manual page 199

You cannot turn the Active 3D Glasses on.
Replace the battery. (Applies only to TDG-BT400A/BT500A.)
For details on how to replace the battery, press the
press the button again to go to "Watching in 3D."
(When using the Touchpad Remote Control, press the touchpad. Then, press the touchpad
again to go to "Watching in 3D" for details.)
The LED indicator on the Active 3D Glasses blinks.
Lights up for 3 seconds: Indicates when turning on the glasses.
Blinks every 2 seconds: Indicates the glasses are powered on.
Blinks 3 times: Indicates the glasses have been powered off.
Blinks green and yellow alternately: Indicates the glasses have started the registration process.
Blinks 3 times every 2 seconds: Indicates the battery capacity is almost running out. Replace
the battery.
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