Post originale di: Country Computer Service ,
I went through this with a 4s where all the screws from two phones got mixed up when a table was bumped. In my case, I bought a set of screws for baseline comparison. I took a sheet of paper and drew squares, looked at the repair guide, and wrote in each square a size and number of screws. Last, I used a micrometer to measure each screw and place it on/in the square on a piece of paper. Later, I used a little plastic (think fishing lure holder) clear box and labeled each compartment where I placed screws from a couple extra sets that I had ordered -- never know when you might lose one. It takes a bit of time but better than shooting in the dark.