I have a Panasonic Toughbook CF-28. The LCD display is dim and best seen w/flashlight. The screen works fine on another laptop. I've put another working LCD screen on this laptop and get the same poor result. An external monitor works perfectly. There is no reason to change anything on the screens as I know they work. The display is poor in the BIOS. I believe it's a motherboard issue, I don't know if there is a fix.