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Introduction

Use this guide to replace a faulty logic board.

When reassembling your iMac, follow our thermal paste application guide to reapply the thermal paste.

    • With the hinge free to move, the iMac will be unbalanced and hard to work on. Repairs are fast and easy with an iMac service wedge, but can be completed without one.

    • If you are using the iFixit cardboard service wedge, follow these assembly directions to put it together.

    • Before beginning any work on your iMac: Unplug the computer and press and hold the power button for ten seconds to discharge the power supply's capacitors.

    • Be very careful not to touch the capacitor leads or any exposed solder joints on the back of the power supply. Only handle the board by the edges.

  1. iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 2, image 1 de 2 iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 2, image 2 de 2
    • Starting on the left of the display, near the power button, insert the iMac Opening Tool into the gap between the glass panel and the rear enclosure.

    • The hub on the iMac Opening Tool will keep you from pushing the wheel in too far. If using a different tool, insert no more than 3/8" into the display. Otherwise, you risk severing antenna cables and causing serious damage.

  2. iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 3, image 1 de 3 iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 3, image 2 de 3 iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 3, image 3 de 3
    • Use the tool like a pizza cutter—roll it along through the gap, and it will cut the foam adhesive through the center.

    • Be sure to always push with the handle behind the cutting wheel. If you pull, the wheel might get pulled out of the handle.

    • Run the tool up along the left side of the display.

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    • Continue running the tool up around the top left corner.

  4. iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 5, image 1 de 2 iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 5, image 2 de 2
    • Cut the adhesive along the top left of the display.

  5. iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 6, image 1 de 2 iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 6, image 2 de 2
    • Continue along the top of the display.

    • You may want to run the tool back and forth through what you've already cut a few times, to ensure you get as much of the adhesive separated as possible.

  6. iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 7, image 1 de 3 iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 7, image 2 de 3 iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 7, image 3 de 3
    • Push the tool around the top right corner of the display.

  7. iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 8, image 1 de 2 iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 8, image 2 de 2
    • Wheel the tool down along the right side of the display.

  8. iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 9, image 1 de 2 iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 9, image 2 de 2
    • Finish pushing the opening tool to the bottom of the right side of the display.

    • At this point, you'll want to run the tool back around the entire display, to ensure you cut as much adhesive as possible.

  9. iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 10, image 1 de 3 iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 10, image 2 de 3 iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 10, image 3 de 3
    • While the opening tool cut most of the adhesive, the display will still be slightly adhered to the case. A plastic card will be necessary to free up the last of this adhesive.

    • Set the iMac face-up on a table.

    • Starting from the top right corner of the iMac, wedge a plastic card between the display and frame.

    • Be careful not to insert the plastic card more than 3/8", or you may damage internal components.

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    • Gently twist the plastic card sideways to create a gap between the display and frame.

    • Move slowly and be careful not to stress the display glass too much—you only need to make a gap of about 1/4".

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    • Slide the card toward the center of the display to cut any of the remaining adhesive along the top right corner of the iMac.

    • Be sure to stop before the iSight camera, or you may damage it.

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    • Wedge the plastic card into the top right corner once again, and leave it there to prevent the adhesive from resticking.

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    • Insert a second plastic card into the gap between the display and frame near the top left corner of the iMac.

  14. iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 15, image 1 de 2 iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 15, image 2 de 2
    • Gently twist the card upward, slightly increasing the space between the display and frame.

    • As with the other side, twist slowly to allow the adhesive time to separate, and be careful not to over-stress the display glass.

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    • Slide the plastic card toward the center, again stopping just before the iSight camera.

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    • Wedge the plastic card back into the top left corner.

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    • With both plastic cards inserted as shown near the corners, gently twist the cards sideways to increase the gap between display and case.

    • If there are any sections that seem to stick and won't separate, stop twisting and use one of the cards to cut the remaining adhesive.

    • Begin to lift the top of the display up from the frame.

    • Only lift the display a few inches—the display data and power cables are still connected to the logic board.

  18. iMac Intel 21.5" EMC 2638 Logic Board Replacement, Display: étape 19, image 1 de 2 iMac Intel 21.5" EMC 2638 Logic Board Replacement, Display: étape 19, image 2 de 2
    • While holding the display up with one hand, use the other hand to unplug the display power cable.

    • Lift the display up enough to have easy access to the connector, but not so much that you stretch the cables and stress their connections (about 8").

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    • Use the tip of a spudger to flip up the metal retaining bracket on the display data cable.

    • Carefully pull the display data cable from its socket on the logic board.

    • Be sure to pull the display data cable connector straight out of its socket.

  20. iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 21, image 1 de 2 iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 21, image 2 de 2
    • Lift the display up to a near-vertical position.

    • At this point there is still a strip of adhesive along the bottom of the display, that will hold the display to the frame like a hinge. You can loosen this adhesive by working the display up and down a few times.

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    • Be very careful not to touch the capacitor leads or any exposed solder joints on the back of the power supply (boxed in red).

    • Grasp the small tab at the end of one of the bottom edge display adhesive strips and pull the adhesive toward the top of the iMac to remove it.

    • Repeat this step with the other adhesive strip and remove it.

    • If either adhesive strip breaks before it's removed, use a plastic card to slice through the remaining adhesive.

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    • Lift the display up from the frame and remove it from the iMac.

    • It may be necessary to slowly lift from one side, to peel against the remaining adhesive.

    • Be very careful handling the display—it's big, heavy, and made of glass.

    • During reassembly, head over to our display adhesive guide to install the new adhesive.

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    • Remove the following five Phillips screws holding the lower support bracket in place:

    • Four 3.2 mm screws

    • One 1.7 mm screw

    • On at least some EMC 2544 machines, all five screws are the same size.

    • You may need to peel up the display adhesive lining the bottom edge of the iMac enclosure to access the screws.

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    • Remove the lower support bracket from the iMac enclosure.

  25. iMac Intel 21.5" EMC 2638 Logic Board Replacement, Right Speaker: étape 26, image 1 de 2 iMac Intel 21.5" EMC 2638 Logic Board Replacement, Right Speaker: étape 26, image 2 de 2
    • Use a spudger to loosen the right speaker cable's connector from its socket on the logic board.

    • It is useful to push downward on both short sides of the connector to walk it out of its socket. Be careful with the corners of the connectors, as they can be easily broken off.

    • Pull the connector downwards to remove it from its socket.

  26. iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 27, image 1 de 1
    • Remove the two 10.0 mm T10 screws securing the right speaker to the rear enclosure.

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    • Insert the tip of a spudger between the right speaker and the antenna cable that is routed into the speaker's right side.

    • Run the spudger down along the right side of the speaker to pry the antenna cable from its channel in the right speaker.

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    • Lift the right speaker straight up and remove it from the iMac.

    • The speaker is tightly wedged into the rear enclosure, therefore it may be helpful to tilt the speaker side to side while pulling upward.

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    • Remove the following screws securing the hard drive bracket to the rear enclosure:

    • Two 21 mm T10 Torx screws from the left-hand hard drive bracket.

    • One 9 mm T10 Torx screw.

    • One 27 mm T10 Torx screw.

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    • Remove the left and right hard drive brackets from the iMac.

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    • The next few steps bring your hands close to the exposed face of the power supply. Do not touch the face of the power supply or any of the exposed solder. Touching it risks a high voltage shock from the many large capacitors attached to the board.

    • Use the tip of a spudger to push each side of the power button cable connector and gently walk it out of its socket.

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    • Use the tip of a spudger to push each side of the power supply control cable connector and gently walk it out of its socket.

  33. iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 34, image 1 de 1
    • Remove the two 7.2 mm T10 Torx screws securing the power supply to the rear enclosure.

    • In newer model iMacs these are 7.2 mm T8 Torx screws.

    • During reassembly, be careful not to trap the power button wire behind the board.

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    • When working on the power supply, be very careful not to touch the capacitor leads or any exposed solder joints on the back of the power supply. Only handle the board by the edges.

    • Tilt the power supply forward.

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    • Pull the power supply slightly up and out from the rear enclosure.

    • Rotate the power supply counterclockwise, lifting the right side up about an inch higher than the left.

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    • Slide the power supply to the right to clear the screw posts on the rear enclosure.

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    • Rock the power supply forward and remove it from its recess in the rear enclosure.

    • Do not try to completely remove the power supply from the iMac yet—it is still connected to the logic board.

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    • Be very careful not to touch the capacitor leads or any exposed solder joints on the back of the power supply. Only handle the board by the edges.

    • Flip the power supply over to access the DC power cable connection behind the logic board.

    • Squeeze the tab on the back side of the DC power cable connector and pull it straight out of its socket on the back of the logic board.

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    • You may find it helpful to set the iMac down on its back for the next couple of steps.

    • Use the flat end of a spudger to press the clip on the side of the AC inlet cable connector inward.

    • While pressing on the release clip with the spudger, grasp the AC inlet cable, and pull the connector straight out of its socket.

  40. iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 41, image 1 de 1
    • Remove the power supply from the iMac.

  41. iMac Intel 21.5" EMC 2638 Logic Board Replacement, Fan: étape 42, image 1 de 2 iMac Intel 21.5" EMC 2638 Logic Board Replacement, Fan: étape 42, image 2 de 2
    • Gently pull the fan cable connector straight away from its socket on the logic board.

  42. iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 43, image 1 de 1
    • Remove the three 12.3 mm T10 shoulder screws securing the fan to the rear enclosure.

  43. iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 44, image 1 de 2 iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 44, image 2 de 2
    • Remove the fan from the iMac.

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    • Lift the hard drive from the edge nearest the logic board and pull it slightly out of its recess.

    • The hard drive is attached by a single SATA power/data cable—do not attempt to fully remove it from the iMac yet.

  45. iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 46, image 1 de 2 iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 46, image 2 de 2
    • Use a spudger to disconnect the single SATA power and data combo cable by gently prying its large plastic connector away from the hard drive.

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    • Remove the hard drive assembly from the iMac.

  47. iMac Intel 21.5" EMC 2638 Logic Board Replacement, Hard Drive Tray: étape 48, image 1 de 1
    • Remove the single 7.2 mm T10 screw securing the hard drive tray to the rear enclosure.

  48. iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 49, image 1 de 1
    • Remove the hard drive tray from the rear enclosure.

  49. iMac Intel 21.5" EMC 2638 Logic Board Replacement, Logic Board Assembly: étape 50, image 1 de 2 iMac Intel 21.5" EMC 2638 Logic Board Replacement, Logic Board Assembly: étape 50, image 2 de 2
    • Push on each side of the left speaker cable connector with the tip of a spudger and gently walk it out of its socket.

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    • If necessary, use a pair of tweezers to gently peel the tape securing the left speaker cable to the SATA data/power cable.

    • This tape only needs to be removed if you are removing the left speaker.

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    • De-route the left speaker cable by pulling it straight up out of the retaining clip in the back of the rear enclosure.

    • In a similar fashion, lift the combo SATA data/power cable up out of the retaining clip.

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    • Use the flat edge of a spudger to flip up the metal retaining bracket on the iSight camera cable connector.

    • Pull the iSight camera cable straight out of its socket on the logic board.

    • Do not use excessive force. This is a delicate connector that can be easily damaged.

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    • Use the flat edge 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.

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

    • Push the cable slightly to the right to clear it for the removal of the logic board.

  55. iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 56, image 1 de 1
    • Remove the following screws securing the exhaust duct to the rear enclosure:

    • Two 6.3 mm T8 screws

    • Two 4.7 mm T8 screws

  56. iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 57, image 1 de 1
    • Remove the four 7.2 mm T10 screws securing the logic board to the rear enclosure.

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    • Tilt the top of the logic board away from the rear enclosure.

    • Lift the logic board straight up and out of the iMac.

    • Be careful not to snag the board on any of the rear case's screw posts.

    • The I/O boards at the bottom of the logic board will be the greatest challenge. It is recommended to pull gently to avoid any damage.

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    • When installing the logic board, take care to align the exterior I/O ports correctly. The logic board can sit crooked even when secured with all its screws.

    • Use a USB flash drive and/or ethernet cable to ensure the logic board is seated correctly while you screw it in.

  59. iMac Intel 21.5" EMC 2638 Logic Board Replacement, AirPort/Bluetooth Card: étape 60, image 1 de 1
    • Remove the two 3.2 mm T5 screws securing the AirPort/Bluetooth card to the logic board.

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    • Slightly lift the AirPort/Bluetooth card and pull it straight out its socket.

    • Do not use excessive force to pull the end of the AirPort/Bluetooth Card away from its socket on the logic board. Doing so may damage the socket.

    • When reinstalling the card, be sure it is properly seated before reinstalling the retaining screws.

  61. iMac Intel 21.5" EMC 2638 Logic Board Replacement, RAM: étape 62, image 1 de 3 iMac Intel 21.5" EMC 2638 Logic Board Replacement, RAM: étape 62, image 2 de 3 iMac Intel 21.5" EMC 2638 Logic Board Replacement, RAM: étape 62, image 3 de 3
    • Release the tabs on each side of the RAM module by simultaneously pushing each tab away.

    • The RAM module should pop up slightly from its socket.

    • Grab the top left and right corners of the RAM module and carefully pull it straight out of its socket.

    • Repeat the process to remove additional RAM modules as necessary.

  62. iMac Intel 21.5" EMC 2638 Logic Board Replacement, Logic Board: étape 63, image 1 de 2 iMac Intel 21.5" EMC 2638 Logic Board Replacement, Logic Board: étape 63, image 2 de 2
    • Grasp the hard drive power connector and gently pull it out of its socket on the logic board.

  63. iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 64, image 1 de 3 iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 64, image 2 de 3 iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 64, image 3 de 3
    • The SATA data connector has a clip that must be pressed to allow removal.

    • While pressing on the clip with your thumb, lift and disconnect the SATA data connector from its socket on the logic board.

  64. iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 65, image 1 de 1
    • The following screws secure the heat sink to the logic board:

    • Remove the two T8 screws from the exhaust port end of the heat sink.

    • Loosen, but do not remove, the four captive T8 screws securing the CPU end of the heat sink.

  65. iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 66, image 1 de 2 iMac Intel 21.5" EMC 2638 Logic Board Replacement: étape 66, image 2 de 2
    • Slowly lift and remove the heat sink from the logic board.

    • When reassembling your iMac, follow our thermal paste application guide to reapply the thermal paste.

    • During reassembly of the logic board, pay attention to the position of the I/O connectors. When the board is back in the case, insert a USB or Thunderbolt cable into one of the connectors to align it perfectly.

Conclusion

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

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Sam Goldheart

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6 commentaires

Followed the guide and unfortunately i couldnt power the mac on after. But i suspect that the logic board or power might have been faulty

Mark Barner - Réponse

Has this iMac a M.2 SSD port? I watched some other disassembly’s from this Mac and there was mentioned, that it has a M.2 port.

Hans Peter - Réponse

Hi! Just pulling one of these apart now and “Yes” there is a proprietary PCIe connector for an SSD — has to be an Apple one though.

Geoff Paynter -

Just to add that this Logic Board (Core i5) cannot be simply swapped with Logic board EMC 2742 w/ Core i7!

Chekad Sarami - Réponse

Hey that button cell on the logic board, will it need replaced? I can’t find info here nor OWC about changing it. I will be going in for upgrades, just picked one of these iMacs up, since I’m going in, don’t want to have to go in again if I don’t have to.

Benjamin David - Réponse

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