you may not need to REMOVE the display. If you can remove the keyboard and access the display connectors on the motherboard. There may be 2 of them. One for the display and one for the backlight. If the backlight connector is loose and the light is going out you can shine a light onto the screen and see video information. If not it would be the video connection. If these are flat cable connectors, be careful with these connectors as there are relatively fragile. Follow the opening and closing procedure and do not force anything. Make sure to fully insert the cable end into the connector b4 closing.