Apple manufactures the MacBook Pro with a piece of plastic that covers the pins that connect the LCD to the motherboard. The problem is, that although it is intended to protect the tiny pins, it actually traps in heat and the result is that it melts the pins into the motherboard. Check out the video link.
http://youtu.be/Yhuju0a7ric
http://youtu.be/Yhuju0a7ric