Did you use the correct cables? Check what your laptop port supports, it is most likely to be VGA. Use the correct cables to connect. Ask a knowlegeable person to verify the cables for you.
Try checking the max resolution of your graphics card and see if it covers the range of that of your tv's. In Windows 7, Right-click on your desktop>Screen resolution
In the resolution drop down box, try dragging the range to the max resolution available and verify it.
Also, you could try out this solution:
When your laptop has been connected to your tv, go to Start>Control Panel>Hardware and Sound>Nvidia Control Panel
Under the Display tree, Select the Change resolution tab and under the category: Select the Display you would like to change, select your TV.
Now change its resolution accordingly to fit.
Hope my advice has been useful to you.