According to your HDTV manual, you do have a VGA input (as well as a 3.5 mm VGA Audio in). A quick look at specs for the Dell Latitude D630 shows it also has a VGA output, but I'm unclear as to which video device you have:
1) NVIDIA® Quadro NVS 135M
2) Intel® Graphics Media Accelerator X3100
Right-click somewhere on your desktop. If you have the NVidia card installed, you should see an option to open the NVidia Control Panel. This is where you would set up multiple displays. If you're running with just the Intel Graphics, when you right-click on the desktop, you should see an option for Graphic Properties. Again, look for an option to set up multiple displays.
-Wolf sends