i am Lesley , i work in a cellphone and communication company. we sell lcd screen, back housing battery for iPhone Samsung LG Sony and so on. we also repair cellphone.
"I phone not working"에 답변is your iPhone can work well before you update?
"iPhone 4 is working but screen is black?"에 답변take down the screen to see whethere the cable is broken or get loose. if not . maybe the screen is broken.
"iPhone 4 won't turn on all black screen"에 답변replace the lcd screen maybe is a good idea .
"iPhone won't turn on after screen replacement?"에 답변http://www.aliexpress.com/store/product/...-PCS-for-iPhone-5S-4-inch-IPS-OEM-LCD-Display-Digitizer-Touch-Screen-Frame-with/1294129_32222622185.html
"iPhone Not Fully Loading to Home Screen"에 답변connect the Phone with computer. press and homebutton and power key. when Apple LOGO show up, immediately release the power button and continue holding the HOME button until the phone shows a data cable link iTunes icon. then open iTunes icon on your computer, it will show links to be restored on an iPhone, click recovery point or restore the system you want to update. http://www.aliexpress.com/store/product/...-PCS-Black-White-100-Tested-High-Quality-LCD-Display-Digitizer-Touch-Screen-with-Tools-LCD/1294129_32219396130.html