i have reason to belive that the backlight on my laptop has gone bad. there was a period of time when the screen would go very dark but i could close and open my laptop and the light would be back on. this went on for about a week or so and now the screen is always dark. i can plug in my computer via an s-video cable and the picture is fine.

my question is where is the exact location of the back light? i have taken apart my computer and i am not worried about a warranty because it conveniently expired 2 months ago. any help is appreciated. thanks!