Sony KDL-46HX820 - Manual (Page 106)

You cannot charge the 3D Glasses. (Applies only to TDG-BR250/BR200.)
Check if the TV is turned on. The 3D Glasses cannot be charged if the TV is in standby mode.
Check if the 3D Glasses are turned off. The 3D Glasses must be turned off to charge.
Check if the USB cable is connected properly.
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