Phone · Apple · iPhone 4S
Apple iPhone 4S Logic Board Repair
Logic Board Repair guide for the Apple iPhone 4S
Before you begin
Tools
- P2 Pentalobe screwdriver
- Phillips #00 screwdriver
- Plastic spudger
- Tweezers
- SIM eject tool
- Flathead screwdriver
Parts / materials
- Isopropyl alcohol (99%)
- Replacement iPhone 4S logic board
- Lint-free wipes
Safety
- Discharge the battery below 25% before disassembly to reduce the risk of fire if damaged.
- Wear an anti-static wrist strap connected to a grounded surface to protect components from ESD.
- Handle the logic board strictly by its edges to avoid damaging surface-mounted components.
Overview
Step-by-step
- 1
Unscrew Dock Port Screws
2 minRemove the two 3.6 mm Pentalobe screws located on either side of the 30-pin dock connector port.
- 2
Slide Off Rear Panel
2 minPush the rear panel upward toward the top edge of the iPhone until it moves about 2 mm. Lift the rear panel away from the chassis.
- 3
Detach Battery Connector Bracket
2 minRemove the two Phillips screws securing the battery connector bracket to the logic board. Lift the metallic bracket out of the chassis.
- 4
Pry Up Battery Connector
2 minUse a plastic spudger to gently pry the battery connector straight up from its socket on the logic board.
- 5
Remove Battery
3 minPull the clear plastic pull tab to lift the battery off the adhesive holding it to the rear case.
- 6
Remove Dock Connector Cover
2 minRemove the two screws securing the dock connector cable cover plate. Lift the bracket out of the phone.
- 7
Disconnect Cable Connectors
2 minPry the dock connector ribbon cable straight up from its socket on the logic board using a spudger.
- 8
Disconnect Antenna Cable
2 minUnplug the lower cellular antenna coaxial cable from the bottom right corner of the logic board.
- 9
Disconnect Rear Camera
3 minUnclip the rear camera bracket, disconnect the camera ribbon cable, and lift the camera module out of the case.
- 10
Eject SIM Card Tray
1 minInsert a SIM eject tool or paperclip into the hole beside the SIM tray to release and remove the tray.
- 11
Unclip Upper Wi-Fi Antenna Bracket
4 minRemove the five screws holding the top Wi-Fi antenna and grounding bracket, then lift the bracket away.
- 12
Disconnect Top Ribbon Cables
4 minUse a spudger to carefully pop off the five ribbon cables attached to the top edge of the logic board.
- 13
Remove Logic Board Screws
3 minRemove the remaining logic board retaining screws, including the internal standoff screw near the rear camera well.
- 14
Lift Out Logic Board
3 minCarefully tilt the bottom of the logic board up and slide it down and out of the chassis, avoiding snagging any loose ribbon cables.
After your Apple iPhone 4S logic board repair
Power the iPhone 4S back on and test the logic board repair function before you put every screw away. Check touch/display response, charging, cameras, buttons, and wireless as relevant to this repair. If something fails after closing the device, reopen carefully and reseat the connectors for this Apple iPhone 4S job before assuming the part is defective. Keep leftover adhesive and screws labeled in case you need a second pass.
Keep learning
Explore more Apple iPhone 4S repair context in the encyclopedia, or open related DIY guides.
