Is it possible to replace the display backlight on a Powerbook independently of the LCD panel? Specifically, I'm asking about a 15" A1138 "DLSD." Even at maximum brightness, I find the display uncomfortably dim to the point where it's difficult to read in a bright room. The panel is fine aside from this issue. Specifically, I see this listing on Amazon http://www.amazon.com/Apple-PowerBook-CCFL-Backlight-Lamp/dp/B00K8R1PVS And am wondering what backlight replacement entails.