iPhone 4S Home Button Ribbon Cable Replacement - iPhone 4s

Step 1 | Rear Panel

To start, ensure the iPhone's battery has depleted to less than 25% capacity; a fully charged lithium-ion battery presents a fire and/or explosion hazard if it is inadvertently damaged.
To prevent electrical shock or damage, ensure the iPhone is completely de-energized prior to starting the repair process.
Using a Pentalobe P2 screwdriver, detach the two screws measuring 3.6 mm located adjacent to the dock connector.
To prevent damage, ensure the driver is firmly engaged with each Pentalobe screw before turning, as these screws are susceptible to stripping.

Step 2

Apply pressure to the back cover, directing the force upwards against the top edge of the device.
Expect a displacement of approximately 2 millimeters.

Step 3

Carefully separate the iPhone's rear panel from its housing, taking precautions to avoid breakage of the plastic clips affixed to the panel.
Carefully detach the iPhone's back cover.

Step 4 | Battery

Using a screwdriver, detach the battery connector from the logic board by unscrewing the screws listed below.
Employ a PH00 Phillips screwdriver to loosen and remove a 1.7-millimeter screw.
Utilize a PH00 Phillips screwdriver to loosen and remove a 1.5 mm screw.

Step 5

Gently disengage the pressure contact from the battery connector by sliding it clear of its retaining location.
Disconnect the pressure contact.

Step 6

Using a 5/32-inch hex key, carefully tighten the three retaining screws on the motor assembly to a torque of 3.5 inch-pounds, ensuring not to overtighten and potentially damage the threads.Carefully disconnect the battery connector from its corresponding socket on the logic board, employing a plastic opening tool to avoid damage.
Using the tool, gently insert the tip into the gap separating the loudspeaker enclosure from the connector's metal cover, then raise the connector's lower edge.
To detach the battery connector, move it straight up away from the logic board; avoid any lateral pressure.
Avoid applying force directly to the battery connector's socket to prevent separation from the logic board, as it is secured by four tiny solder joints susceptible to damage.

Step 7 | Reassembly tip

Using a 5/32-inch hex key, carefully tighten the four mounting screws securing the fan assembly to the motor housing, ensuring each is snug but not over-tightened to avoid damaging the plastic; a torque of 6 in-lbs is recommended.Ensure the pressure contact is correctly situated during reassembly, resting atop the Philips screw post as indicated, with the gold contact oriented toward the battery connector.
To prevent wireless interference caused by oils from handling, thoroughly clean the pressure contact using a degreaser like Windex or isopropyl alcohol.

Step 8

Using a 5/32-inch hex key, carefully tighten the four mounting screws securing the fan assembly to the motor housing, ensuring each is snug but not over-tightened to prevent damage; observe a torque of 6 in-lbs per screw.Using a plastic opening tool, carefully wedge the tip into the gap separating the battery from the iPhone's outer casing, positioning the tool close to the device's lower edge.
Using the plastic opening tool, carefully work your way along the battery's right side, lifting gently at multiple locations to release the adhesive holding the battery to the device's casing.
To loosen a stubborn battery bond, carefully introduce a small quantity of isopropyl alcohol, with a concentration exceeding 90%, beneath its perimeter.
Allow approximately 60 seconds for the isopropyl alcohol to reduce the adhesive bond.
Carefully raise the battery using the flat, plastic tip of a specialized opening tool.
To avoid damage, do not use excessive force when removing the battery. If the battery remains stuck, add additional drops of alcohol to dissolve more of the adhesive. Ensure the pry tool does not bend, break, or penetrate the battery casing during removal.
To prevent damage, ensure any residual alcohol solution is completely removed by wiping with a clean cloth or by permitting it to evaporate fully prior to battery replacement.

Step 9

Using a 5/32-inch hex key, carefully tighten the three retaining screws on the motor assembly to a torque of 3.5 inch-pounds, ensuring not to overtighten and potentially damage the threads.Gently lift the battery away from its adhesive backing by grasping the visible, transparent plastic tab.
Exercise caution when drawing back the plastic tab, as excessive force may cause it to tear.
Disconnect the power source by detaching the battery.
Carefully detach the protective plastic packaging from the new battery by gently separating it from the ribbon cable.
Before installation, ensure the new battery's cable is formed into the correct contour to match its intended configuration.
To confirm correct positioning during battery replacement, briefly attach the battery connector to the device; after securing the battery with adhesive, detach the connector.
Following reassembly, execute a complete system reset to proactively avoid potential problems and streamline any subsequent diagnostic procedures.

Step 10 | Dock Connector Cable

Using a 5/32-inch hex key, carefully tighten the four mounting screws securing the fan assembly to the motor housing, ensuring each is snug but not over-tightened to prevent damage; observe a torque of 6 in-lbs per screw.Using appropriate tools, detach the logic board from the dock connector cable cover by unscrewing the screws that hold it in place.
Use a Phillips screwdriver to remove a single screw with a 1.5 mm head.
Use a Phillips screwdriver to remove a single screw measuring 1.2 millimeters.
Carefully detach the metal cover protecting the dock connector cable.

Step 11

Carefully lift the dock cable connector from its corresponding socket on the logic board, utilizing the flat edge of a plastic opening tool.

Step 12

Carefully detach the dock connector cable from both the adhesive holding it to the logic board and the adhesive securing it to the speaker enclosure's side.

Step 13

Carefully lift the cellular antenna cable connector from its corresponding socket on the logic board using the tip of a plastic opening tool.
Carefully maneuver the cellular antenna cable, freeing it from the metal finger retainers secured to the logic board.

Step 14 | Rear Camera

Exercise caution when working near the rear camera's flash; the plastic ring positioned above it is prone to becoming dislodged and requires careful handling to prevent accidental movement during the disassembly process.
Employ tweezers, a plastic pry tool, or a spudger to detach the surrounding plastic ring.

Step 15

Using appropriate tools, detach the cable cover from the logic board by unscrewing the four fasteners that hold it in place.
Employ a Phillips screwdriver, size 2.7 mm.
Employ a Phillips screwdriver, size 2.6 mm.
Employ a Phillips screwdriver, size 1.3 mm.
Employ a Phillips screwdriver, size 1.2 millimeters.

Step 16

Carefully disengage the cable cover tabs from the slots they occupy within the EMI shield on the logic board, utilizing the edge of a plastic opening tool for leverage.
Carefully detach the cable cover by gently prying upwards from the side closest to the top edge of the device.

Step 17

Carefully leverage the edge of a plastic opening tool to lift the rear camera connector away from its corresponding socket on the logic board.
Exercise caution to avoid damaging adjacent parts while lifting.
Carefully detach the rear camera assembly from the iPhone.
Before reassembling, confirm the tiny rubber gasket, located directly below the rear camera, is correctly positioned.

Step 18 | SIM Card

To release the SIM card and its tray, carefully insert a SIM eject tool or a straightened paperclip into the designated release aperture.
Applying considerable pressure might be necessary.
Using a SIM tray removal tool or a straightened paperclip, carefully extract the SIM card and its associated tray from the device.

Step 19 | Logic Board

Disconnect the five connectors located at the logic board’s upper edge, observing the specified sequence.

The flexible cable connecting the headphone jack and volume controls.
Connect the flexible ribbon cable that provides video input from the front-facing camera.
The flexible ribbon cable connecting the display's touch sensor to the mainboard is the digitizer cable.
Connect the display data cable.
Refer to the second image to locate the power button cable; it's situated directly below the headphone jack/volume button cable.

Carefully use a plastic opening tool to pry the connectors of the cables upward, releasing them from the logic board sockets.
Exercise caution to avoid damaging the tiny, sensitive surface mount components while disconnecting the cables.

Step 20

Using a Phillips screwdriver, detach the grounding clip from the logic board by unscrewing the 1.5 mm screw located close to the headphone jack.

Step 21

Carefully lift the small grounding clip away from the logic board’s surface using the pointed end of a spudger.
Detach the iPhone from the grounding clip by firmly holding the clip.
To prevent grounding problems, thoroughly clean all metal surfaces where the grounding clip makes contact—excluding the connector housings—using a solvent like Windex or isopropyl alcohol; this removes oils transferred from handling.

Step 22

Using the appropriate tool, detach the 4.8 mm standoff screw located close to the headphone jack.
To detach standoff screws, utilize a standoff screwdriver or a compatible bit.
If a dedicated tool is unavailable, a small flathead screwdriver can be carefully employed; however, exercise heightened awareness to prevent slippage and potential harm to nearby parts.

Step 23

Carefully separate the Wi-Fi antenna connector from the logic board using the tip of a plastic opening tool.

Step 24

Carefully remove the black tape that secures the screw located close to the power button, if it is present.
Using a Phillips screwdriver, detach the logic board by unscrewing the 2.6 mm screw located close to the power button.
Exercise care while extracting the screw, as it secures the power contact, which is prone to detachment during removal.
During removal, be aware that the screen and digitizer cables, now disconnected above the Q-code, have a small rubber bumper positioned beneath them; this component is prone to detaching from the logic board, either during the removal process itself or subsequently when the cables are handled.

Step 25

Using the appropriate screwdriver, detach the logic board from the enclosure by unscrewing all screws that hold it in place.
Locate and remove a Phillips-head screw, measuring 2.5 millimeters, positioned close to the vibrator motor.
A Phillips head screw, measuring 2.4 millimeters, is required.
A 3.6 mm standoff is located on the logic board's edge, positioned closest to the battery compartment.
Employ a standoff driver bit, attached to a driver handle, to detach the 3.6 mm standoff screw.
If a dedicated tool isn't available, a small flathead screwdriver can be carefully employed; however, exercise heightened vigilance to prevent slippage and potential harm to nearby parts.

Step 26

Gently raise the logic board, beginning at the speaker enclosure end, and move it horizontally, sliding it out from beneath the iPhone's top edge.
Carefully detach the logic board from the device, ensuring all connections are properly disconnected and avoiding any stress on the component.
To prevent potential grounding problems, thoroughly clean all metal surfaces where the logic board makes contact with itself, excluding connector pins, using a cleaning agent like Windex or isopropyl alcohol before reassembling. Finger oils can interfere with electrical grounding.
A tiny rubber bumper, positioned along the logic board's upper edge at the digitizer and screen cable exit point, safeguards those cables from damage caused by bending. This component may adhere to the cables or detach from the logic board during disassembly; refer to step 22 for additional information.

Step 27

The tiny grounding tab associated with the rear camera, located close to the power button, must be kept secure; it’s affixed to the printed circuit board via screws and secured with black adhesive tape.

Step 28 | Vibrator

Carefully insert the plastic opening tool into the gap separating the vibrator motor from the iPhone's side casing.
Using a prying tool, carefully lift the vibrator to detach it from the adhesive that holds it in place within the iPhone.
Carefully detach the vibrator component.

Step 29 | Speaker Enclosure Assembly

Using a Phillips screwdriver, detach the speaker enclosure by unscrewing the two fasteners, each measuring 2.4 mm.

Step 30

Carefully detach the plastic bracket secured beneath the screw nearest the dock connector cable.

Step 31

Carefully detach the speaker enclosure, a component containing the speaker and microphone, from the iPhone's internal structure.

Ensure the Wi-Fi grounding fingers are positioned beneath the lip of the iPhone’s metal case, referencing the second image for correct placement, prior to tightening the speaker enclosure assembly’s screws.

To prevent wireless interference, thoroughly remove any oils or residue from the metal surfaces where the Wi-Fi antenna grounding fingers meet the iPhone case, utilizing a cleaning agent like Windex or isopropyl alcohol.

Step 32 | Screen

Carefully peel away the black tape securing the display to its mounting points.

Carefully separate the corner screws; they differ in thickness from the standard 1.5mm screws.

Step 33

Using a Phillips screwdriver, detach the display assembly by unscrewing the 1.5 mm screw located close to the power button.

Step 34

Using a Phillips screwdriver, detach the 1.5 mm screw located close to the headphone jack.
Accessing the screw is simplified by detaching the headphone jack, especially when putting the device back together; consult the iPhone 4S Headphone Jack Cable guide for instructions on headphone jack removal if you encounter difficulties.

Step 35

Using a Phillips screwdriver, detach the 1.5 mm screw positioned close to the lower microphone.

Step 36

Using a Phillips screwdriver, detach the 1.5 mm screw located close to the dock connector cable.

Step 37

Using a Phillips screwdriver, slightly reduce the tightness of each of the three large-head screws positioned along the iPhone’s volume button side, rotating them approximately 180 degrees.
These screws do not require full removal; during reassembly of the display, position the washers adjacent to the screw head, referencing the visual guide provided.

Step 38

Using a Phillips screwdriver, slightly reduce the tightness of each of the three screws with large heads located on the opposite side of the iPhone, rotating them approximately 180 degrees.

Step 39

Carefully lift the display assembly's edges from the chassis using the tip of a plastic opening tool, applying gentle force all the way around.

Step 40

Carefully detach the display assembly from the iPhone, ensuring all technical specifications, measurements, numerical values, required tools, and safety precautions are observed.

Step 41 | Display Assembly Installation

Before beginning the display assembly replacement, observe these crucial details to ensure proper installation.
Carefully transfer the home button to the new display assembly, noting that it is often not included and the gasket is fragile and prone to tearing. Verify the replacement display has the speaker mesh; if absent, relocate it from the original display.
Prior to installation, remove the adhesive backing, typically identified by its blue or pink color, from the replacement panel.
Ensure the 7 mm clear plastic ring that protects the front-facing camera is moved from the original display to the replacement display if it is not pre-installed on the new screen.

Step 42 | Display Assembly Installation (Cont'd)

Pay close attention to the subsequent details regardless of whether you are fitting a new display assembly or retaining the original.
Gently manipulate the LCD data cables and digitizer cables to ensure they are straight, then route them through the opening created in the device's outer casing.
Ensure the digitizer cable is routed completely through its designated channel, as demonstrated in the central image.
The digitizer cable's excess length is causing a problematic bend or loop, as demonstrated in the images, where it becomes trapped within the slot; observe this looping in the third image to understand the incorrect installation.
An improperly installed digitizer cable will fail to seat correctly within its connector on the logic board. Avoid forcing the cable, as the enclosure's sharp edges can sever it. Instead, disassemble the display assembly, ensure the cable is straight, and then carefully guide it fully into its socket.

Step 43 | Display Assembly Installation (Cont'd)

To prevent LCD malfunctions during reassembly, avoid physical contact with the metal base of the LCD data cable; if contact occurs, carefully wipe the area with an alcohol wipe to restore its condition before proceeding.
To prevent display issues potentially caused by static electricity, use an alcohol wipe to thoroughly clean the touchscreen before powering on the iPhone following reassembly.
To ensure proper initialization following reassembly, power on the iPhone by connecting it to standard AC power; after successful startup, the power connection can be removed.
To prevent surface damage, apply a fresh screen protector to the display following reassembly.

Step 44 | Home Button Ribbon Cable

Carefully lift the home button ribbon cable's retaining flap by inserting the edge of a plastic opening tool underneath it.
Apply upward force to the hinged flap, ensuring you do not apply pressure to the socket.

Step 45

Carefully extract the home button cable from its connector using tweezers.

Step 46

Carefully align the 4mm diameter dowel pin with the corresponding hole in the chassis and secure it using a hammer and a soft-faced mallet, ensuring no damage occurs to the surrounding components.
Gently guide the home button cable out of its opening in the device's exterior housing, then detach it from the iPhone.
Ensure the new home button ribbon cable is fully inserted into its designated channel to prevent operational problems.