Could you tell me why are you unable to connect them? You should use HDMI cable and usually the OS discovers a second display. You should be able to adjust some settings from the video card options. I would advise you to confirm that the HDMI you are using is working properly. On your TV, you should switch to the correct HDMI port.
If your TV shows message like "Unsupported signal. Please check the device output signal", this means that the resolution of the laptop which has been attempted to display on the Bravia is not a resolution that your TV recognizes. You'll need to try different resolution settings to find one that works with your Sony Bravia.
It might be the video output from your laptop, that needs to be set to "Digital" signal, because it may currently be set to "Analog" signal, which is causing a conflict with the HDMI connection.
There is usually a combination with the "F" key on the laptop's keyboard to toggle between digital and analog video ouput. Try by pressing the Fn /functional/ key first, then press the "F" key.