Does your notebook display stay quite dark, but you can still easily see the image in the background? This can be a sign that the inverter of your laptop is defective (does not apply to LED displays). The inverter is responsible for controlling the brightness of LCD displays. The installation is uncomplicated and with some technical know-how and the help of our video laptop installation instructions for the replacement easy to do yourself. If you have any problems, our free technical support will be happy to help you.