Welcome to the iPhone 4 teardown to the logic board.

1.Take your phone and unscrew the bottom screws near the phone speakers which will take out the the back surface.

2. Carefully remove the Li-on battery and be careful not to damage the battery.

After you have done unscrewing if you have trouble removing the back use your thumbs to gently slide the back piece off.

Find the antenna and speaker enclosure and unscrew.

Carefully remove the antenna and speaker enclosure and keep it in a safe area. Then look for the emi shield at the top of the phone and unscrew the screw.

4. Use the plastic pry to lift up the five logic board connectors at the top of the phone.

5. For the final step of this teardown unscrew a screw near the camera, then use the pry to carefully remove the camera

This has been a short teardown to help you with what you need.