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I was the first to break my screen when my iPhone 4 fell out of my lap and onto the ground. My son dropped his on a band trip. When I mentioned the broken screens to an Assistant Scoutmaster, he told me to order the parts and he would replace them. I did so and then he encouraged us to replace them ourselves by using the ifixit video tutorials.
I had two screens. It took me a moment to realize that my Verizon phone was different but thank goodness ifixit had an easy way to look up my model and step-by-step guides. My first attempt, I pulled too hard on the LCD wire and it broke. I used the second screen and viola, it was fixed. Ooo it was so empowering. I felt like I was ready to work on my son's phone. Ordered the parts from ifixit this time and they came quickly. Took less than an hour for his repair. Both phones fixed for far less than it would cost to repair 1 at a retail location. I feel like I should be on a Holiday Inn Express commercial.
I would read all the instructions first and then start. I was much better the second go around. Also, make sure you get the magnetized screwdrivers. Those screws are so tiny. If you lay a towel down on your work surface, the screws are less likely to bounce off the table to the ground,avoiding the whole Where's Waldo scenario with the missing screw.