To set the TV in 3D mode, press the [Adjust] button on the remote control. Select [2D/3D] > [3D], then press [OK].
If your TV receives a broadcast 3D movie via the antenna, the TV shows a double picture but the 3D effect is not seen with the 3D glasses, you will need to select a suitable 3D viewing format.
To set the TV to a suitable 3D viewing format, press the [Adjust] button. Select [3D format] and press OK, then select [3D - Side by side] or [3D - Top / bottom] according to the double picture positions.