原帖由： oldturkey03 ,
Dan Miller, "the first thing I would suggest is that you clean your phone. The rice is a great first step, but it will not fix your phone, nor will it prevent corrosion damage which might occur later on. Use [guide|5825|this guide] to clean your phone. It was written for a 3G but it will still pertain to your phone as well. The repair guides for your phone [http://www.ifixit.com/Device/iPhone_4#guideList|are here.] After that you want to check this "There is really no a surefire way to say which part is the one that gives you the problem. I would recommend that you start it systematically. Start with the easiest part, and that is the display, replace that. If your screen is absolutely black, with no faint images, I am certain that this is your problem. If it would have faint images, I would recommend to take a look at the backlight IC and coil on the logic board. That repair is a bit more difficult due to the fact that those are SMD components." It's kind of (in a very simplistic description) the LCD is your light bulb and the backlight IC and coil are your light switch. Also check this [http://www.ifixit.com/Answers/View/86292/iPhone+4+got+wet%2C+but+works%2C+screen+dark|question] and multiple more on here. Try the display first. Hope this helps, good luck."