lCD backlit doesn't work

After rainy climbing, my cameras LCD doesn't shows any things.. After drying, ı put battery in and ı saw that, LCD is black. When ı put on light from up or down side ı could see the things (image,..) very poor. I bought and renewed LCD. Nothing changed. I realized that, 40 pin connecting began to heat. I checked up the 40 pin cable and saw that 6 th pin was disappeared. So what do you recommend me to do? To change the 40 pin cable will help to end the problem? Why did it get heated?