This is my first topic. I have a Galaxy Core + with a small defect. The bottom edge of the screen (2-3mm) does not respond to touch. I know that the screen on our phone is glued, but I would check the tape on the motherboard. Unfortunately, nowhere can I find instructions on how to remove the plastic casing motherboard. All screws have been removed, but the case still holds. I also have the S4 and it's all easy to disassemble.