Answer to: iPhone 4 screen is black after replacementMandy, your symptoms sound similar to mine. Have you tried cleaning the LCD connector with a light application of Windex, as in this post above from Luis: I had the same problem. This is how I fixed it. Remove the LCD cables, Place some windex on a napkin, wipe the connectors. There might be some windex left on the connectors, so get a dry napkin and dry off. Make sure you put back the conncetors correctly and it should work. It did for me. I only removed the battery to avoid a short circuit. and the plate that covers the LCD connector so you dont have to tear the whole thing apart. GOOD LUCK. Hope this helps some of you. I also posted similar info above with a few other tips.
Answer to: iPhone 4 screen is black after replacementThe same as a poster above, I had the same problem. This is how I fixed it. With the back of the phone open, disconnect the battery (step 5), remove the wifi antenna (step 13 and 14) and then disconnect the LCD and digitizer cables (step 17). I sprayed some windex onto a clean, thin cotton rag, like the kind you can buy in boxes at Home Depot, and gently wiped both sides of the LCD and digitizer connectors. I then reattached LCD and digitizer cables and battery and back case, and the screen fired up. This worked after multiple attempts at reassembly without using the windex, so the light application of windex seemed to be the trick. Two other things, on this reassembly, I had a lot of difficulty getting the LCD connector to snap into place, I suspect that on earlier attempts I may not have had the connector aligned and connected correctly. Second, on this reassembly, I was in a rush and only tightened the wifi antenna enough to hold it in place, I did not crank down on the screws that hold the wifi antenna. T...