Step 1 – Rear Panel Before disassembling your iPhone, be sure the silent switch is activated.
Step 2 – Remove the two Phillips screws next to the dock connector.
Step 3 – Push the rear panel toward the top edge of the iPhone. The panel will move about 2 mm.
Step 4 – Remove the rear panel from the iPhone.
Step 5 – Battery Remove the single Phillips screw securing the battery connector to the logic board.
Step 6 – Use an iPod opening tool to carefully pry the battery connector up from the ends closest to the top and bottom edges of the iPhone. Do not pry against the antenna contact.
Step 7 – Use the clear plastic pull tab to gently lift the battery out of the iPhone. Remove the battery. Before reconnecting the battery connector, be sure the antenna pressure contact is properly positioned next to the battery connector.
Step 8 – Logic Board Use a paperclip or another thin steel object to eject the SIM card and its holder. This may require a significant amount of force. Remove the SIM card and its holder.
Step 9: Remove the following two screws: One 1.2 mm Phillips One 1.6 mm Phillips Remove the thin steel dock connector cable cover from the iPhone.
Step 10: Use an iPod opening tool to gently pry the dock cable connector up off the logic board from both short ends of the connector.
Get pdf iPhone 4 Dock Connector Installing