iMac 27" 2017 Logic Board Assembly Replacement

Written By: Adam O'Camb
  • Comments: 6
iMac 27" 2017 Logic Board Assembly Replacement

Difficulty

Moderate

Steps

10

Time Required

No estimate

Introduction

Prerequisite-only guide to replace the logic board assembly in an iMac 27" 2017.

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    • Use a T5 Torx screwdriver to remove the two 4 mm screws securing the AirPort/Bluetooth antenna cables.

    Rather than unscrew the antenna cables, I usually unscrew the screws on the board and slide out the whole AirPort/Bluetooth module, which means I need not keep track of which antenna cable goes where.

    johann beda -

    Confirmed. 2 T5 screws, and pull the board straight up out of its socket behind he motherboard. Leave all cables attached.

    ebay -

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    • Use the point of a spudger to disconnect each of the four antenna connectors from the AirPort/Bluetooth card.

    • Note the original positions for each connector when reconnecting the cables. From left to right on the card, the antennas are connected in the following order:

    • Leftmost

    • Top

    • Upper right

    • Lower right

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    • This is a delicate connection that can be easily broken.

    • Flip up the metal retaining bracket on the iSight camera cable.

    • Pull the camera cable connector straight out of its socket, toward the top of the iMac.

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    • Use the flat end of a spudger to disconnect the headphone jack cable connector from its socket on the logic board.

    • Gently push the cable out of the way.

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    • Use the tip of a spudger to flip open the retaining flap on the microphone ribbon cable ZIF socket.

    • Be sure you are prying up on the hinged retaining flap, not the socket itself.

    • Use tweezers to gently pull the microphone ribbon cable straight out of its socket.

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    • Remove the following screws securing the logic board:

    • Two 23.7 mm T8 screws

    • One 20.1 mm T25 spacer screw

    • One 17.6 mm T8 screw

    • One 7.2 mm T8 screw

    • Three 7.1 mm T8 screws

    • One captive T8 screw

    • This screw is beneath a hole in the logic board. If you aren't using an iFixit driver, you may need an extension or a screwdriver with a longer shaft.

    A 3.0 Hex driver worked for the T25 spacer screw.

    johann beda -

    1/8” hex worked, too

    ebay -

    For the T25 I used a regular chisel tip screw driver that was exactly the width between two opposite sides of the Torx star

    The standoff is only screwed in by two or so turns and came out very easily for me

    So you shouldn't have to force it and damage threads

    Eoin -

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    • Pull the hard drive SATA cable and connector through the right hard drive bracket. Move the cable to the right side of the iMac, out of the way of the exhaust port.

    • Don't attempt to completely remove the cable—it can't be removed just yet, but will get in the way of removing the logic board.

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    • Use a T8 Torx screwdriver to remove the two 5.6 mm screws from the top of the heat sink exhaust duct.

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    • When removing and installing the logic board, take care not to damage the delicate microphone ribbon cable at the bottom left of the board.

    • Tilt the logic board slightly forward.

    • Lift the logic board straight up and out of the iMac. Be careful not to snag it on any of the screw posts attached to the inside of the rear case.

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    • When reassembling your iMac, be very careful to align the exterior I/O ports correctly. The logic board can sit crooked even when secured with all its screws.

    • You can use a USB flashdrive or ethernet cable to ensure the logic board is seated correctly while you screw it in.

    Insbesondere die USB3.1 Port sollten mit einem Stecker belegt werden! Ich habe nur die USB3.0 (A?) Ports mit Steckern belegt und konnte nach dem Zusammenbau alle Port benutzen, aber nicht die USB3.1 (C) Ports. Am besten überall einen Stecker rein.

    Boris Boesler -

Conclusion

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

Author

Adam O'Camb

Member since: 11/04/15

178619 Reputation

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