Written By: Andrew Bookholt · Push the rear panel toward the top edge of the iPhone. The panel will move about 2 mm. Step 3 Pinch the rear panel with your fingers, and lift it away

iPhone 4 Verizon Logic Board ReplacementReplace a dead logic board in your iPhone 4 Verizon.

Written By: Andrew Bookholt

iPhone 4 Verizon Logic Board Replaceme… Draft: 2018-09-04Guide ID: 4892 -

This document was generated on 2020-04-14 12:21:19 AM (MST).

© iFixit — CC BY-NC-SA www.iFixit.com Page 1 of 17

INTRODUCTION

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

TOOLS:P2 Pentalobe Screwdriver iPhone (1)Phillips #000 Screwdriver (1)iFixit Opening Tools (1)iPhone Standoff Screwdriver (1)

PARTS:iPhone 4 CDMA Logic Board (1)iPhone 4 Screw Set (1)




Step 1 — Rear Panel

Before you begin, discharge youriPhone battery below 25%. Acharged lithium-ion battery cancatch fire and/or explode ifaccidentally punctured.

Power off your iPhone beforebeginning disassembly.

Your phone's rear cover may havetwo #000 Phillips screws or Apple's5-Point "Pentalobe" screws. Checkwhich screws you have, and ensureyou also have the correctscrewdriver in order to remove them.

Remove the two 3.6 mm Pentalobeor Phillips #000 screws next to thedock connector.




Step 2

Push the rear panel toward the top edge of the iPhone.

The panel will move about 2 mm.

Step 3

Pinch the rear panel with yourfingers, and lift it away from theiPhone. Alternatively, use a SmallSuction Cup .

Be careful not to damage the plasticclips attached to the rear panel.




https://www.ifixit.com/Store/Tools/Small-Suction-Cup/IF145-019

Step 4 — Battery

Remove the single 1.5 mm Phillipsscrew securing the batteryconnector to the logic board (ifpresent).

Step 5

Use the edge of a plastic openingtool to gently pry the batteryconnector up from its socket on thelogic board.

Be very careful to only pry up on thebattery connector and not the socketon the logic board. If you pry up onthe logic board socket, you maybreak it entirely.

Remove the metal clip covering theantenna connector.




Step 6

Pull up on the exposed clear plastic tab to peel the battery off the adhesive securing it to theiPhone.

If the tab breaks before the battery is freed, carefully slide a spudger under the battery tab torelease the adhesive. Prying in other places may cause damage.

Remove the battery.

If your replacement battery came in a plastic sleeve, remove it before installation by pulling it awayfrom the the ribbon cable.

Before reassembly, clean metal-to-metal contact points with a de-greaser such as windex. The oilsfrom your fingers have the potential to cause wireless interference issues.

Perform a hard reset after reassembly. This can prevent several issues and simplifytroubleshooting.




https://www.ifixit.com/Guide/How+to+Force+Restart+an+iPhone+4+Verizon/44534

Step 7 — Dock Connector Cable

Remove the two 1.8 mm Phillips screws securing the dock connector cable to the logic board.

Remove the thin metal dock connector cable cover.

Step 8

Use the edge of a plastic openingtool to pry the dock cable up from itssocket on the logic board.




Step 9

Peel the dock connector cable offthe adhesive securing it to the logicboard and the side of the speakerenclosure.

Step 10

Remove the 1.6 mm Phillips screw securing the pressure contact to the logic board near thevibrator.

Remove the pressure contact.




Step 11

Use the edge of a plastic opening tool to pry the cellular antenna cable up from its socket on thelogic board.

De-route the cellular antenna cable out from under the metal fingers attached to the logic board.

When reconnecting the antenna wire be VERY certain that the round connector at the end of thewire is centered on its mating half on the motherboard before applying pressure. Failure to do sowill likely destroy both halves of the connector.




Step 12 — Rear Camera

Remove the following five screws:

Three 1.3 mm Phillips screws

One 1.5 mm Phillips screw

One 2.4 mm Phillips screw

Step 13

Lift the cable cover from its edge nearest the top of the iPhone.

Pull the cable cover tabs out of their slots cut into the EMI shield on the logic board and remove itfrom the iPhone.




Step 14

Use the edge of a plastic opening tool to pry the rear camera connector up from its socket on thelogic board.

Be careful not to break any components off the surrounding area on the logic board as you pryupwards.

Remove the rear camera from the iPhone.

Be careful not to scratch the back of the display assembly after the removal of the rear facingcamera.




Step 15 — Logic Board

Disconnect the five cables near thetop of the logic board in the followingorder:

Headphone jack/volume buttoncable

Power button cable

Front facing camera cable

Digitizer cable

Display data cable

To disconnect the cables, use theedge of a plastic opening tool togently lift their connectors up andout of the sockets on the logicboard.

Be careful not to break any of thesmall and delicate surface mountcomponents as you disconnect thecables.




Step 16

Remove the 1.5 mm Phillips #000screw near the headphone jack.

Step 17

Lift the small grounding clip up offthe logic board and remove it fromthe iPhone.




Step 18

Use the edge of a plastic openingtool to disconnect the Wi-Fi antennacable connector from the logicboard.

When reconnecting the wifi ribbonconnector to the mother board beVERY certain that the roundconnector at the end of the ribboncable is centered on its mating halfon the motherboard before applyingpressure. Failure to do so will likelydestroy both halves of theconnection.

Step 19

If present, remove the piece of tape covering a Phillips screw near the power button.




Step 20

Remove the 2.5 mm Phillips #000screw securing the logic board nearthe power button.

Remove the 4.8 mm standoff screwnear the headphone jack.

Standoff screws are bestremoved using an iPhoneStandoff Screwdriver Bit anddriver handle.

In a pinch, a small flatheadscrewdriver will do the job—butuse extra caution to ensure itdoesn't slip and damagesurrounding components.

Step 21

Remove the 3.4 mm Phillips screwnear the vibrator motor.

Remove the two 3.6 mm standoffscrews along the side of the logicboard nearest the battery opening.




https://www.ifixit.com/Store/Tools/iPhone-Standoff-Screwdriver-Bit/IF145-343

https://www.ifixit.com/Store/Tools/64-Bit-Driver-Handle/IF145-326

Step 22

Carefully lift the logic board from theend closest to the speaker enclosureand slide it away from the top edgeof the iPhone.

Remove the logic board.

Before reassembly, be sure to cleanall metal-to-metal contact points onthe logic board (not the matinghalves of connectors) with a de-greaser such as windex or isopropylalcohol. The oils on your fingershave the potential to causegrounding issues.

There's a small rectangular rubberpad at the top of the logic board thatprevents the display cables fromchafing against the edge of theboard. If it comes loose during yourrepair, make sure to position itcorrectly when reinstalling your logicboard.




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To reassemble your device, follow these instructions in reverse order.

Step 23

Be sure not to lose the smallgrounding finger for the rear facingcamera near the power button.




Documents

Written By: Andrew Bookholt · Push the rear panel toward the top edge of the iPhone. The panel will move about 2 mm. Step 3 Pinch the rear panel with your fingers, and lift it away