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So my iPhone screen cracked from side but it still works perfect..I currently have protective glass on top of it to protect it I wanted to have it replaced but I can’t do it on my own I wanted to ask is what parts will be replaced and will the replaced parts will work smoothly? Here is a pic-http://tinypic.com/r/24ndyxy/9

The iPhone 6 front display assembly. It’s basically the Glass + Digitizer + LCD + Backlight + Front display frame all together. In short the iPhone 6 LCD Screen and Digitizer Will replaced parts work smoothly? Depends on the quality of the part or if you get a faulty / defective part. As usual if you get it fixed from a good repair shop / or buy from a good seller then you usually can get the screen replaced under warranty in case it goes bad / faulty.

If the frame/case is not bent then just the screen… Guide: iPhone 6 Screen Replacement