Is there backlight power cable attached from the screen to the compute

Is the led backlight power cable on the screen by itself or attached to the computer? Do I have to swap this cable from my cracked old screen one to the new one I purchased? Since you don't sale this screen I purchased one from eBAY. I know I have to use the temperature sensor cable from my old one but I am not sure about the backlight power cable. I only see two cables attached from the screen to the computer. These are the Data and temperature sensor cable. I don't see a backlight cable power attached from the screen to the computer. I am confused. Please help.