Screen and Keyboard not backlit

I just finished replacing the LVDS cable for someone who had inadvertently cut their cable. Now that I've hooked the LVDS cable to the screen and logic board when I power the computer on I get no light, they keyboard will not light up nor will the screen. I can see that there is stuff on the screen so I know that the LVDS cable works. What controls the light to the screen and keyboard and is there anything that I should check before buying that part. This is a Macbook pro 13" 2.26ghz intel core 2 duo. Thanks