Yadira, the first thing to do would be to clean your phone. Follow this guide to show you how. Once it is clean, reevaluate and if your LCD is still black, you will need to replace. It is possible that the backlight got shortened out. If that still will not resolve your problem, check the backlight coil and the backlight IC for further problems. you will find some good instructions on youtube.com about the how to. Hope this helps, good luck.