This issue concerns instances when a display screen may not be working or functioning properly on a fixture. A good first step is to check the display ribbon cable for any tears or damage. (They may be easily missed at first glance as this one was). If there is any sign of damage or tears you should replace the display screen before trying anything else. The pics below show a tear in a display ribbon cable that was difficult to see at first glance but was able to be seen upon closer inspection.