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iPhone 4S Logic Board Replacement

Replace a dead logic board in your iPhone 4S.

  • Auteur: Walter Galan
  • Geschatte tijd: 1 uur
  • Moeilijkheid: Moeilijk

Use this guide to replace your iPhone's logic board.

Stap 1 Logic Board  ¶ 

Remove the five cables near the top of the logic board in the following order: Headphone jack/volume button cable

Stap 1 Logic Board  ¶ 

  • 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.

Stap 2  ¶ 

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

Stap 2  ¶ 

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

Stap 3  ¶ 

Use the tip of a spudger to pry the small grounding clip up off the logic board. Carefully grasp the grounding clip and remove it from the iPhone.

Stap 3  ¶ 

  • Use the tip of a spudger to pry the small grounding clip up off the logic board.

  • Carefully grasp the grounding clip and remove it from the iPhone.

  • Before reassembly, be sure to clean all metal-to-metal contact points on the grounding clip (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.

Stap 4  ¶ 

Remove the 4.8 mm standoff screw near the headphone jack.

Stap 4  ¶ 

  • Remove the 4.8 mm standoff screw near the headphone jack.

  • Standoff screws are best removed using an iPhone Standoff Screwdriver Bit and driver handle.

  • In a pinch, a small flathead screwdriver will do the job—but use extra caution to ensure it doesn't slip and damage surrounding components.

Stap 5  ¶ 

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

Stap 5  ¶ 

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

Stap 6  ¶ 

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.

Stap 6  ¶ 

  • 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)

  • Notice the small rubber bumper under the screen & digitizer cables (which are detached at top above the Q-code). This bumper can fall off of the logic board when removed or get stuck to the cables and fall off later.

Stap 7  ¶ 

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

Stap 7  ¶ 

  • 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 standoff driver bit and driver handle to remove the single 3.6 mm standoff screw.

  • In a pinch, a small flathead screwdriver will do the job—but use extra caution to ensure it doesn't slip and damage surrounding components.

Stap 8  ¶ 

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

Stap 8  ¶ 

  • 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.

  • There is a small rubber bumper that sits on the top edge of the logic board where the digitizer and screen cables come through the case. It protects the cables as they bend over the top of the logic board. This can either get stuck to the cables or fall off the logic board when it comes out. Look back over step 22 for more details.

Stap 9  ¶ 

Be sure not to lose the small grounding finger for the rear facing camera near the power button. This finger rests on top of the PCB, screwed down, and covered with the adhesive black plastic tape.

Stap 9  ¶ 

  • Be sure not to lose the small grounding finger for the rear facing camera near the power button. This finger rests on top of the PCB, screwed down, and covered with the adhesive black plastic tape.