Replacing failed video cable on a Dell Inspiron 15 7000 series 7559 7557 is a relatively complicated and time consuming process. In my case the laptop had a touch screen and because of that the disassembly process was even more difficult.
Why do I replace the video cable? This laptop has developed a very annoying problem. As soon as you open the display more than 90 degrees, the backlight turns off. You move the display back and the backlight turns on.