원문 게시자: oldturkey03 ,
You tried a hard reset or restore? Do you see any shadows of your screen when you angle the display toward the light? It is possible that the display assembly may need to be replaced, due to a malfunctioning LCD. It is possible that the ribbon cables or connectors are corroded, or loose. It is possible that your backlight IC/coil are malfunctioning. There are plenty of possibilities. The cost for spare parts is depending on your location.