Ursprünglicher Beitrag von: Minho ,
Can you explain what you mean by ''"the screen light up in black but does not work"''? Do you mean that the backlight is on but there is no image or do you mean there is no backlight and only a dim image? First things first, I would double check all of my connections. [guide|19239|Use this guide]. The next thing to verify is the condition of the battery. If your phone is recognized by a computer, then use a software like 3uTools to test the battery. If your phone is not recognized, then take the battery out and measure the voltage with a multimeter. It should read ~3.8 - 4.2V. Start with that and get back to us about your comment above and we can help you further.