iFixit

Remove the five cables near the top of the logic board in the following order:

• Headphone jack/volume button cable
• Front facing camera cable
• Digitizer cable
• Display data cable
• Power button cable (located underneath the headphone jack/volume button cable as shown in the second picture.)

To disconnect the cables, use the edge of a plastic opening tool to gently lift their connectors up and out of the sockets on the logic board.

Be careful not to break any of the small and delicate surface mount components as you disconnect the cables.

Remove the 1.5 mm Phillips screw securing the grounding clip to the logic board near the headphone jack.

Lift the small grounding clip up off the logic board and remove it from the iPhone.

Use a small flathead screwdriver to remove the 4.8 mm standoff near the headphone jack.

Use the edge of a plastic opening tool to disconnect the Wi-Fi antenna from the logic board.

If present, peel the piece of black tape covering the hidden screw near the power button.

Remove the 2.6 mm Phillips screw securing the logic board near the power button.

• (Use caution when removing this screw and removing the power contact held by it; the contact tab will come loose with the screw)

Remove the following screws securing the logic board to the case:

• One 2.5 mm Phillips screw near the vibrator motor
• One 2.4 mm Phillips screw
• One 3.6 mm standoff along the side of the logic board nearest the battery opening.

Use a small flathead screwdriver to remove the single 3.6 mm standoff.

Carefully lift the logic board from the end closest to the speaker enclosure and slide it away from the top edge of the iPhone.

Remove the logic board.

Before reassembly, be sure to clean all metal-to-metal contact points on the logic board (not the mating halves of connectors) with a de-greaser such as windex or isopropyl alcohol. The oils on your fingers have the potential to cause grounding issues.