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iPhone 4 Logic Board Replacement

Replace a dead logic board in your iPhone 4.

  • Auteur: Walter Galan
  • Geschatte tijd: 30 minuten - 2 uren
  • Moeilijkheid: Moeilijk

Use this guide to replace your iPhone 4's logic board.

Secties
Gereedschap

Stap 1 Logic Board  ¶ 

Use a SIM card eject tool or a paperclip to eject the SIM card and its holder. This may require a significant amount of force.

Stap 1 Logic Board  ¶ 

  • Use a SIM card eject tool or a paperclip to eject the SIM card and its holder.

  • This may require a significant amount of force.

  • Remove the SIM card and its holder.

Stap 2  ¶ 

Remove the following two screws: One 1.2 mm Phillips

Stap 2  ¶ 

  • 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.

  • Before reassembly, be sure to clean all metal-to-metal contact points on the dock connector cable cover with a de-greaser such as windex. The oils on your fingers have the potential to cause wireless interference issues.

Stap 3  ¶ 

Use an iPod opening tool to gently pry the dock cable connector up off the logic board from both short ends of the connector. Use an iPod opening tool to gently pry the dock cable connector up off the logic board from both short ends of the connector.

Stap 3  ¶ 

  • Use an iPod opening tool to gently pry the dock cable connector up off the logic board from both short ends of the connector.

Stap 4  ¶ 

Carefully peel the dock ribbon cable off the logic board and the lower speaker enclosure. Do not use excessive force to peel the dock ribbon cable off the logic board. Doing so may tear the cable.

Stap 4  ¶ 

  • Carefully peel the dock ribbon cable off the logic board and the lower speaker enclosure.

  • Do not use excessive force to peel the dock ribbon cable off the logic board. Doing so may tear the cable.

Stap 5  ¶ 

Use a plastic opening tool to pry the lower antenna connector up off its socket on the logic board.

Stap 5  ¶ 

  • Use a plastic opening tool to pry the lower antenna connector up off its socket on the logic board.

Stap 6  ¶ 

Remove the 1.9 mm Phillips screw securing the bottom of the logic board to the inner case.

Stap 6  ¶ 

  • Remove the 1.9 mm Phillips screw securing the bottom of the logic board to the inner case.

Stap 7  ¶ 

Remove the following five screws securing the Wi-Fi antenna to the logic board:

Stap 7  ¶ 

  • Remove the following five screws securing the Wi-Fi antenna to the logic board:

  • One 2.3 mm Phillips

  • Two 1.6 mm Phillips

  • One 1.4 mm Phillips

  • One 4.8 mm Phillips

  • When re-assembling, start off with replacing the 4.8 mm Philips screw first, then the 2.3 mm. This is to ensure there is no mix-up, and avoid rendering the LCD and digitizer useless.

  • Also make sure to put the long 4.8 mm Philips back in correctly when reassembling. This is the ground for the Wi-Fi antenna and is often the culprit if you are having bad Wi-Fi reception after reassembly.

Stap 8  ¶ 

Use an iPod opening tool to slightly lift the top edge of the Wi-Fi antenna away from the logic board. Use the tip of a spudger to pull the Wi-Fi retaining clips away from the inner frame. Remove the Wi-Fi antenna from the iPhone. Make sure you don't lose the metal clips on the top of the cover where the 4.8mm screw attaches or the 4.8mm screw. That's the primary reason for abnormal Wi-Fi performance after the reassembly.

Stap 8  ¶ 

  • Use an iPod opening tool to slightly lift the top edge of the Wi-Fi antenna away from the logic board.

  • Use the tip of a spudger to pull the Wi-Fi retaining clips away from the inner frame.

  • Remove the Wi-Fi antenna from the iPhone. Make sure you don't lose the metal clips on the top of the cover where the 4.8mm screw attaches or the 4.8mm screw. That's the primary reason for abnormal Wi-Fi performance after the reassembly.

  • Before reassembly, be sure to clean all metal-to-metal contact points on the connector cover with a de-greaser such as Windex. The oils on your fingers have the potential to cause wireless interference issues. Do not clean the connectors themselves with Windex.

Stap 9  ¶ 

Use an iPod opening tool to carefully lift the rear camera connector up off its socket on the logic board. Remove the rear camera.

Stap 9  ¶ 

  • Use an iPod opening tool to carefully lift the rear camera connector up off its socket on the logic board.

  • Remove the rear camera.

Stap 10  ¶ 

Remove the small circular white sticker (warranty sticker and water indicator) covering the screw near the battery pull tab. Remove the 2.4 mm Phillips screw that was hidden underneath the sticker.

Stap 10  ¶ 

  • Remove the small circular white sticker (warranty sticker and water indicator) covering the screw near the battery pull tab.

  • Remove the 2.4 mm Phillips screw that was hidden underneath the sticker.

Stap 11  ¶ 

Use the edge of a plastic opening tool to gently pry the following connectors up and out of their sockets on the logic board:

Stap 11  ¶ 

  • Use the edge of a plastic opening tool to gently pry the following connectors up and out of their sockets on the logic board:

  • Digitizer cable (pry from bottom)

  • LCD cable (pry from bottom)

  • Headphone jack/volume button cable (pry from top)

  • Top Microphone/sleep button cable (pry from top)

  • Front camera cable (pry from top)

Stap 12  ¶ 

Remove the 4.8 mm standoff screw near the headphone jack.

Stap 12  ¶ 

  • 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.

  • When reassembling the device, this standoff sets the height of the Wi-Fi shield removed in step 13. If not torqued down, the shield will be above the plane of the frame and the back will not slide into place in step 2. The shield should be flush with the headphone jack.

  • When reassembling the motherboard, ensure that its edge sits under the circled standoff, otherwise the screws will not fit.

  • When reassembling ensure that the small rubber spacer attached to the top of the motherboard is in place.

  • Without this part, the motherboard could damage the ribbon cables around it.

Stap 13  ¶ 

Carefully remove the logic board from the iPhone, minding any cables that may get caught.

Stap 13  ¶ 

  • Carefully remove the logic board from the iPhone, minding any cables that may get caught.

  • Be careful not to damage the small gold prong (marked in red, near the top) as it's very fragile.

  • On reassembly, be careful not to trap the lower antenna cable beneath the logic board.