Someone ask me about this.
It’s simple to do.
There are a very few models of notebooks or desktops on the market that has a DVI output. Mostly are S-Video output.
However, if you are sure that there is indeed a DVI output on your laptop computer, and then you can hook it up to your LCD TV provided that you use a DVI to HDMI cable, then you can use a DVI-DVI cable to connect them.
Once the two boxes are connected now, then its time for you to check your keys on the keyboard. Normally, there are key shortcuts there that you need to press so your laptop will switch from laptop display to LCD TV display. You can also do a dual display by going into your control panel.
If you are using Windows XP like what I am using,
Go to START, then CONTROL PANEL… then… look for the Mobile Chipset that controls your laptops or desktop display. Adjust the settings according to your liking.
Other than this, if you just want your LCD TV as your laptop display, just connect the HDMI cables, or even an inferior quality S-Video out (use a S-Video cable for this one), and then use your keyboard shortcuts to switch displays.
I used to do this thing too with my 24″ LCD monitor and my laptop, so I can watch my movies from my laptop in a bigger screen.
I find using an usb TV card usefully too on the laptop, you can watch TV on the train.