MacBook Pro 15″ A1398 Logic Board Replacement Guide (2015 Model)

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OVERVIEW:

In this repair tutorial, we perform a complete logic board replacement on a 2015 MacBook Pro 15-inch, model A1398. The device was mailed in due to a faulty logic board, and the process involves a full internal disassembly to remove and replace the damaged board. We’ll guide you through each detailed step, covering the removal of components like the SSD, fans, I/O board, and Wi-Fi module, followed by installation of the replacement logic board. This blog offers a precise walkthrough for technicians and DIYers alike.

See official Apple specs for this model

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REPAIR TIME & SKILL LEVEL:

This repair is estimated to take about 2 TO 3 HOURS to complete and is of ADVANCED difficulty, requiring careful disassembly of internal components, precision handling, and reassembly of delicate connections.

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STEPS:

Tools You Need

For this repair, you will need a Pentalobe screwdriver to open the bottom case, a T5 Torx screwdriver for removing internal components, a plastic spudger for safe disconnection of cables, and a replacement logic board for the MacBook Pro A1398. Additional tools include isopropyl alcohol and a microfiber cloth for cleaning the chassis during the process.

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Remove the Bottom Case

• Flip the MacBook over to access the bottom cover.
• Use a pentalobe screwdriver to remove all screws around the perimeter.
• Lift and remove the back cover to expose internal components.

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Disconnect the Battery

• Locate the battery connector at the center-top of the logic board.
• Use a plastic spudger to lift the battery connection up.
• Ensure the battery is fully disconnected before continuing work.

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Remove the SSD

• Using a T5 screwdriver, remove the screw holding the SSD in place.
• Slide the SSD out gently and set it aside safely.

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Remove the Wi-Fi Module

• Use a plastic spudger to unplug the Wi-Fi antenna cables.
• Remove the T5 screw securing the Wi-Fi card.
• Lift the Wi-Fi module out of its socket.

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Disconnect and Remove IO Board Components

• Unfasten the T5 screws securing the IO board cable and covers.
• Use the spudger to unplug the IO board cable.
• Unscrew and disconnect the coax cable below that links to the IO board.

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Disconnect the Trackpad and Other Peripheral Cables

• Peel back the trackpad cable and unplug it from the logic board.
• Unplug the keyboard, left speaker, CPU fans, right fan, right speaker, keyboard backlight, and LCD display connectors.

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Remove CPU Fans

• Begin with the left fan and then proceed to the right.
• Unplug the fan connectors before removing them.
• Set both fans aside after unscrewing them with a T5 driver.

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Remove the Logic Board and Heatsink

• Remove the rubber nub covering a hidden T5 screw.
• Unscrew all visible T5 screws across the logic board and heatsink.
• Carefully lift the logic board — do not yank as the MagSafe cable is still connected.

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Disconnect the Remaining Cables from the Logic Board

• Unplug the MagSafe charging cable.
• Disconnect the logic board to IO board coax cable.
• Set the damaged logic board aside.

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Prepare the New Logic Board

• Remove two T5 screws from the chassis for easier installation.
• Clean the top case to ensure no debris is left from the previous logic board.

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Begin Logic Board Installation

• Plug the MagSafe connector and IO board coax cable into the new logic board.
• Begin aligning the board from the right side, slotting it into position while checking all cables are not trapped underneath.

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Secure the Logic Board

• Install the two smallest T5 screws at the bottom.
• Use the longest T5 screws to secure the top corners of the board.

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Reconnect All Cables

• Reconnect the keyboard backlight, speaker, keyboard, and trackpad cables.
• Plug in the front microphone array.
• Make sure all connectors are properly seated and retention bars are closed.

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Reinstall the IO Board

• Secure the IO board with two T5 screws.
• Plug in the IO board flex cable on both ends and secure with retention bars.

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Install Heatsink Screws

• Use T5 screws to secure both sides of the heatsink to the chassis.

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Reinstall CPU Fans

• Start with the right or left fan, whichever is easier.
• Plug in the fan cables before screwing the fans down to ensure easy access.

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Reconnect Webcam and Wi-Fi Antennas

• Plug in the webcam cable.
• Insert the Wi-Fi card and secure with a T5 screw.
• Reconnect the three Wi-Fi antenna cables, moving left to right.

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Secure MagSafe Port and LCD

• Reinstall the two T5 screws holding the MagSafe port.
• Plug in the LCD connector and lock the retention bar.

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Final Internal Assembly

• Reinstall the retention bracket over the trackpad cable.
• Insert and secure the SSD using the original T5 screw.
• Reconnect the battery connector.

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Reassemble Bottom Case

• Replace the bottom cover and secure with pentalobe screws.
• Be mindful of screw size—use the two smaller screws for the top two holes.

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Power On and Test

• Plug in the MagSafe charger and verify the orange charging light.
• Power on the MacBook and ensure it boots properly into macOS.
• Confirm all components (keyboard, trackpad, fans) are working.

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CONCLUSION:

Replacing the logic board in a 2015 MacBook Pro A1398 is a complex process that requires attention to detail and the proper tools. This guide provided a complete walkthrough from disassembly to reassembly, covering each connection and screw placement. If you follow the steps carefully, you can restore functionality to your MacBook. Always double-check connections before powering on. With patience and precision, this repair is absolutely achievable.

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VIDEO TUTORIAL:

Looking for a more in-depth tutorial? Check out our complete teardown video for a detailed step-by-step walkthrough.

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MAIL-IN REPAIR SERVICE:

We offer professional logic board replacement services. If you’re unsure about doing this repair yourself, send your device to our expert technicians for fast and reliable repair.

REPAIR SERVICES

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SHOP PARTS:

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SHOP TOOLS:

Using precision tools ensures a safe and efficient repair. Always use the right tools to prevent damage to delicate components. Investing in quality tools helps avoid costly mistakes during complex repairs.

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HAVE QUESTIONS?

We’re here to help! Contact us:

• Phone: 818-456-4479
• Email: support@tekdep.com

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