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Il Mio Problema
My daughter killed the glass/display on her iPhone 4S for the second time a few weeks ago. I offered to fix it again, but only if she bought an Otterbox case first, and promised to keep the phone in it from here on out...
La Mia Riparazione
I ordered a 4S replacement display from iFixit, and in the process of installing it I *tore* the smaller of the two ribbon cables. I had replaced one of these before, so I was mad at myself for screwing it up this time. So, I sent a "please help me" email to iFixit support and got a discount on a second display, which I *carefully* installed. Thanks guys!
Il Mio Consiglio
I would suggest actually *removing* the six screws that attach the display to the sides of the 4S aluminum body, rather than just loosening them. This way, it's much easier to thread the ribbon cables through the small slot without kinking or tearing them, because you're not distracted with trying to get the six mounting tabs to go behind the screws and washers. That's how I dorked it up the first time. You may actually want to change the repair guide to reflect this.