Introduction
Tools
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            Insert a spudger under the panhandle of the headphone jack/speaker assembly and pry it up from its recess. 
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            Remove the headphone jack/speaker assembly. 
 
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            Push the tip of a spudger under the microphone assembly clip to free it from the earpiece speaker. 
 
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            Disconnect the front-facing camera cable connector. 
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            Remove the front-facing camera from its recess with a pair of tweezers. 
 
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            Insert the flat end of a spudger under the motherboard above the button assembly cable, and pry it out of the phone. 
 
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            Gently lift the motherboard out of the phone, rotating it from the SIM slot edge of the phone. 
 
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            Use the flat end of a spudger to flip the retaining tab on the display cable ZIF connector. 
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            Carefully pull the display cable out of its connector as you remove the motherboard from the display assembly. 
 
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To reassemble your device, follow these instructions in reverse order.
These screws appear to have some yellow locktite on them. I rounded 2 of them, so take caution and make sure your screw driver fits correctly. Otherwise you will need to find a drill press to extract them.
stevengrey -
Is the glass glued to the LCD like the iPhone 5? Is it possible to repair a broken front glass without changing the whole assembly?
Alisio -
Yes and Yes. Just fixed mine.
Buy a Glass+Frame from ebay. Do steps 1-18 and 37. Then just open the bottom two torx screws, no more. They are the only ones connected to the front frame. Then heat&remove the glass, tear off the frame with pliers. Then you just need to clean the screen from residue and apply LOCA and the Glass+Frame.
Adrian Koch -
Yep, I rounded the bottom-left and bottom-center screws as well as my Torx driver, then slipped with the drill bit and went right through the mobo.
Coinneach -
All screws appear to be Torx T4.
ktmorimoto -