A friend's daughter replaced this iPhone4 with new per ATT store rep. She said the top button failed six months prior (under warranty then oops!) and the phone would not turn on. I was asked to see if i could fix it. Well, no working power button means it would drain down. Even a quick plug in shows nothing...unles
I would never do this for anyone else again. The repair is like fixing a watch: 1mm screws that induce myopia and frustration. Yes, I succeeded but I had to get up and walk away for a bit. It took 40 minutes (not including decompressing time) to complete: open, scroll through PDF (preferred viewing), removing the battery was tough (adhesive prevented battery removal and I figured I would damage battery, hence getting replacement too), the flex cable was PITA to re-install, and the Home button (even with adequate lighting, spudge stick and magnification) was troublesome. Yet, I was satisfied to complete, and in the end, it powered up and charged.
iFixit: include all pieces with repair parts. The Power-sensor button cable required precarious transfer of the foam pad and isolator (not mentioned in repair). Apple usually provides these separately-perhaps noting this and getting these parts will help reduce repair time and frustration. The FOUR shield contacts at the speaker WILL break even when gently re-replaced so BECAREFUL. Two broke off on me as the speaker assembly would not seat right. The one screw right of the power button is a #%@! to get a driver on because the display connector blocks the path. I had magnetized my #000 phillips and it still made for difficult seating and final fastening so expect this. Do get a set of spudger sticks (black, anti-static sticks), don't work in a living room or near cats (I don't but reading some other comments, I AM NOT SURPRISED YOU LOST A SCREW IN THE CARPET). Save money, use an ice cube tray for screws. Get a mag/demag for drivers. Most Important: wear ESD and verify mat and outlet are grounded. I chide iFixit for not emphasizing this ALWAYS!
BTW, I am ACMT and Apple doesn't even allow us (no parts) to fix iphones...we just open, inspect and send to depot. I feel for the depot contractors..