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iPhone 5c Logic Board Replacement

Follow these instructions to substitute a damaged iPhone 5c logic board.

Step 1 | Taping the display glass

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To mitigate the risk of additional shattering and potential injury while performing the repair, secure any cracked display glass with tape.
Completely cover the iPhone's screen with multiple layers of transparent packing tape, ensuring the entire display surface is protected.
To prevent glass fragments from scattering and maintain stability during the display separation process, this technique is essential.
To safeguard your eyes from potential glass fragments released during the repair process, always use safety glasses.

Step 2 | Removing the Pentalobe screws

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To avoid potential fire or explosion hazards during repair, ensure the iPhone's lithium-ion battery is depleted to less than 25% capacity prior to beginning work; a fully charged battery poses a significant risk of combustion if damaged.
To prevent electrical shock or damage, ensure the iPhone is completely de-energized prior to starting the repair process.
Using appropriate tools, detach the two screws, each measuring 3.8 mm in diameter and featuring a P2 Pentalobe head, located on both sides of the Lightning connector.

Step 3 | Starting the iSclack Opening Procedure

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For those performing multiple repairs on an iPhone 5, 5s, or 5c, the iSclack is a recommended tool for secure device separation; proceed with the following steps if utilizing this tool, otherwise advance directly to Step 5.
Actuate the iSclack handle to release the clamping force of the suction-cup jaws.
Position the iPhone's lower edge between the vacuum cups, ensuring it contacts the plastic depth gauge.
Position the uppermost suction cup so it hovers slightly above the home button.
To secure the iPhone, position the suction cups centrally and apply consistent, firm pressure to both the upper and lower surfaces after releasing the iSclack handles to fully open its clamping mechanism.

Step 4 | Finishing the iSclack Opening Procedure

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Using a firm grip on the iPhone, disengage the iSclack's handle to release the suction cups, then lift the front panel away from the rear enclosure.
Using the iSclack allows for a controlled separation of the iPhone's components, providing sufficient clearance for disassembly without risking cable damage.
Carefully detach the two adhesive suction cups from the iPhone's exterior.
Proceed directly to Step 8, bypassing Steps 4, 5, and 6.

Step 5 | Manual Opening Procedure

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Position a suction cup directly on the display surface, situated slightly higher than the home button's location.
Ensure the screen's entire surface area is covered by the cup to achieve a secure closure.

Step 6 | Start lifting the front panel assembly

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Using a 5/32-inch hex key, carefully tighten the four retaining screws on the motor assembly to a torque of 3.5 inch-pounds, ensuring not to overtighten and potentially strip the threads.
Securely affix the suction cup to the front panel assembly.
Using one hand to secure the iPhone, lift the suction cup vertically to gently create a small gap between the front panel and the rear enclosure.
Exercise caution and use steady, even pressure when installing the display assembly, as it requires a significantly tighter fit than typical device components.
Using a plastic opening tool, carefully separate the rear case from the display assembly by gently levering it upwards, simultaneously lifting with a suction cup.
To release the front panel assembly from the rear case, carefully disengage the multiple retaining clips, potentially requiring the coordinated use of both a suction cup and a plastic opening tool.

Step 7

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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 strip the threads; observe caution to prevent damage to the motor.
To detach the suction cup, depress the small plastic projection to break the airtight seal.
Detach the display assembly's suction cup.

Step 8 | Opening up the phone

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Using a 5/32-inch hex key, carefully tighten the four retaining screws securing the motor assembly to the gearbox housing, ensuring each is snug but not over-torqued to prevent damage; observe polarity markings during reinstallation and be aware of the spring tension within the assembly.
To expose the connectors located at the upper portion of the device, carefully raise the front panel, beginning at the home button end.
Carefully position the display at a 90-degree angle, then secure it in a supported position to prevent movement during the repair process.
As a temporary measure, an unused, sealed can of soda can substitute for the display during the repair process.
To avoid stressing the display's wiring during the repair process, secure it with a rubber band.

Step 9

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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 Phillips #000 screwdriver, detach the metal bracket that holds the battery connector by unscrewing the two 1.6 mm screws it uses to fasten to the logic board.

Step 10

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Using a 5/32-inch hex key, carefully tighten the four retaining screws on the motor assembly to a torque of 3.5 inch-pounds, ensuring not to overtighten and potentially strip the threads; observe caution to prevent damage to the motor bearings.
Detach the bracket securing the battery connector using a tri-point screwdriver.

Step 11 | Disconnecting the battery connector

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Carefully lift the battery connector away from its corresponding socket on the logic board, employing a spudger or a clean fingernail to avoid damage.
Exercise extreme caution when releasing the battery connector; lifting force should be applied solely to the connector, avoiding any pressure on the logic board socket or the board's surrounding components, as doing so risks socket destruction or damage to nearby parts.

Step 12

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Using a Phillips #000 screwdriver, detach the bracket that holds the front panel assembly cable by unscrewing the screws fastening it to the logic board.
Use two screws, each measuring 1.3 millimeters.
A screw with a 1.7 mm diameter is required.
A screw with a 3.25 mm diameter is required.
Carefully manage all screws during this stage to ensure correct reassembly; improper screw selection, such as using a 3.25 mm screw or a 1.7 mm screw in the bottom right hole, will severely damage the logic board and prevent the device from powering on.
Avoid applying excessive force when tightening screws; if resistance is encountered during installation, verify they are the correct size and do not attempt to force them.

Step 13

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Detach the bracket securing the front panel assembly cable to the logic board.

Step 14 | Disconnecting the front panel assembly cables

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Carefully detach the front camera and sensor cable connector from its socket using a plastic pry tool or your fingernail.
Avoid applying force to the logic board socket while releasing the connector; focus solely on the connector itself.

Step 15

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To prevent accidental shorts, detach the battery before proceeding with cable disconnection or reconnection.
Carefully separate the LCD cable connector from its socket using a plastic pry tool or your fingernail.
Because the LCD and digitizer share a single cable connection, lifting the LCD connector will simultaneously release both connections. Ensure both cables are completely detached prior to display removal.
A disconnected LCD cable from its connector during reassembly can result in a blank screen or white lines appearing on the display; to resolve this, firmly reseat the cable and restart the device by briefly removing and reinstalling the battery.

Step 16 | Separating front panel assembly and rear case

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Detach the front panel assembly from the rear case.

Step 17 | SIM Card

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To prevent damage, ensure the device is fully powered off prior to accessing and extracting the SIM card and its associated tray.
To release the SIM card tray, gently push a SIM card eject tool or a straightened paperclip into the designated aperture.
Using the SIM card eject tool, depress it toward the device to release the SIM tray.
Applying considerable pressure might be necessary.

Step 18

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Using the SIM ejection tool or a similar small, sturdy item, carefully depress the SIM tray release button located on the device's side to release and extract the SIM Card tray assembly.
When putting everything back together, verify the SIM card's alignment within the tray, ensuring it matches the original position.

Step 19 | Logic Board

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Carefully detach the Lightning connector's ribbon cable from the corresponding socket located on the logic board.

Step 20

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Carefully separate the Lightning connector cable from its shield on the logic board by gently lifting it with the spudger's flat end.

Step 21

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To prevent interference with the logic board, carefully maneuver the cable so it's positioned away from the component.

Step 22

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Carefully detach the antenna connector from the logic board's lower edge.

Step 23

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Employing the flat spudger tip, carefully separate the audio control cable connector from its corresponding socket on the logic board.

Step 24

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Carefully detach the connector for the rear camera cable from the socket located on the logic board.

Step 25

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If a strip of tape is covering the logic board's grounding clip, carefully detach it with tweezers.

Step 26

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Detach the logic board from the rear case by unscrewing the listed fasteners.
Use two Phillips screws, each measuring 2.3 millimeters.
Use three screws, each measuring 2.7 millimeters in diameter.
To extract standoff screws, utilize a standoff screwdriver or a compatible driver bit; alternatively, a small flathead screwdriver may be employed, but exercise heightened care to prevent slippage and potential harm to nearby parts.
A Phillips screwdriver, size #000, is needed to remove a 2.5-millimeter screw.

Step 27

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Using a Phillips #000 screwdriver, detach the grounding clip by unscrewing the 1.2 mm screw that holds it in place on the top side-wall.
Employing tweezers, detach the logic board grounding clip.

Step 28

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Carefully pry the logic board's lower edge away from the rear case using a plastic opening tool, creating enough space to subsequently grip and manipulate the board by hand.

Step 29

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Carefully separate the logic board from the rear camera assembly, creating only enough space to reveal the gold contact cap located at the board’s upper edge.
Carefully detach the gold contact cap from the threaded post located on the rear case, ensuring it is stored safely.

Step 30

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To access the antenna connector, rotate the logic board upwards, positioning it towards the volume control buttons.
Avoid detaching the logic board from the rear case at this stage, because an antenna cable remains connected to it on the backside.

Step 31

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Carefully detach the antenna connector from the logic board's rear panel.
Adhesive may secure the connector.

Step 32

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Carefully detach the iPhone's logic board.
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