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  1. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Insert an opening tool: step 2, image 1 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Insert an opening tool: step 2, image 2 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Insert an opening tool: step 2, image 3 of 3
    • 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 case.

    • The hub on the iMac Opening Tool will keep you from pushing the wheel in too far. If using a different tool, insert it no more than 3/8" (9.5 mm) into the display. You risk severing antenna cables and causing serious damage if you insert the tool too far.

  2. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Slice through the display adhesive: step 3, image 1 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Slice through the display adhesive: step 3, image 2 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Slice through the display adhesive: step 3, image 3 of 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.

  3. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Cut through the remaining adhesive: step 4, image 1 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Cut through the remaining adhesive: step 4, image 2 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Cut through the remaining adhesive: step 4, image 3 of 3
    • Continue wheeling the tool up around the top left corner.

  4. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 5, image 1 of 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 5, image 2 of 2
    • Cut the adhesive along the top left of the display.

  5. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 6, image 1 of 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 6, image 2 of 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 27" Retina 5K Display 2020 Logic Board Replacement: step 7, image 1 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 7, image 2 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 7, image 3 of 3
    • Push the tool around the top right corner of the display.

  7. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 8, image 1 of 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 8, image 2 of 2
    • Wheel the tool down along the right side of the display.

  8. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 9, image 1 of 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 9, image 2 of 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 27" Retina 5K Display 2020 Logic Board Replacement: step 10, image 1 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 10, image 2 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 10, image 3 of 3
    • While the opening tool did the lion's share of the work, 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, insert a plastic card between the display and frame.

    • Be careful not to insert it more than 3/8" (9.5 mm), or you may damage internal components.

  10. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 11, image 1 of 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 11, image 2 of 2
    • Gently twist the plastic card to open the space between the display and frame, and cut any remaining adhesive near the corner.

    • Using too much force will crack the glass. Work carefully, and don't try to create a gap any larger than about 1/4" (6 mm).

  11. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 12, image 1 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 12, image 2 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 12, image 3 of 3
    • Be sure to stop cutting before the iSight camera in this step, or you may damage it.

    • Slide the card toward the center of the display, to cut any remaining adhesive.

  12. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 13, image 1 of 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 13, image 2 of 2
    • Put the card into the corner again and let it stay there to keep the adhesive from resettling.

  13. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 14, image 1 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 14, image 2 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 14, image 3 of 3
    • Insert a second card into the gap between the display and frame in the top left corner.

  14. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 15, image 1 of 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 15, image 2 of 2
    • Gently twist the card, slightly increasing the space between the display and frame.

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

  15. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 16, image 1 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 16, image 2 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 16, image 3 of 3
    • Slide the plastic card toward the center, again stopping just before the iSight camera.

  16. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 17, image 1 of 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 17, image 2 of 2
    • Insert the card back into the top left corner.

  17. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 18, image 1 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 18, image 2 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 18, image 3 of 3
    • With the cards inserted as shown near the corners, gently twist the cards 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 adhesive in the problem area.

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

    • Only lift the display a few inches—it is still attached to the iMac by data and power cables.

  18. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Disconnect the display cables: step 19, image 1 of 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Disconnect the display cables: step 19, image 2 of 2
    • While holding the display up with one hand, use the other to unplug the display power cable.

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

  19. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 20, image 1 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 20, image 2 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 20, image 3 of 3
    • Flip up the metal retaining bracket on the display data cable.

    • Disconnect the display data cable.

    • This is a delicate connection that can easily be broken. Be sure to pull the display data cable connector straight out of its socket, toward the top of the iMac.

  20. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Lift the display: step 21, image 1 of 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Lift the display: step 21, image 2 of 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.

  21. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Remove the remaining adhesive: step 22, image 1 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Remove the remaining adhesive: step 22, image 2 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Remove the remaining adhesive: step 22, image 3 of 3
    • 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.

  22. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Remove the display: step 23, image 1 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Remove the display: step 23, image 2 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Remove the display: step 23, image 3 of 3
    • Be very careful handling the display—it's big, heavy, and made of glass. The display has fragile edges. Avoid lifting the display by the corners.

    • Lift the display up from the frame and remove it from the iMac. Lay the display face down on a flat, soft surface.

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

    • After the adhesive is cut, it cannot be used to re-seal the display in place. Follow the adhesive replacement guide for your model when your repair is complete to replace the adhesive strips that secure the display to the rear enclosure.

  23. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Remove the support bracket: step 24, image 1 of 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Remove the support bracket: step 24, image 2 of 2
    • Use a Phillips screwdriver to remove the nine 3.2 mm screws securing the support bracket.

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

  24. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 25, image 1 of 1
    • Remove the lower support bracket (a.k.a. "chin strap") from the iMac enclosure.

  25. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Remove the left speaker: step 26, image 1 of 1
    • Remove two 10 mm T10 screws.

  26. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 27, image 1 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 27, image 2 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 27, image 3 of 3
    • Unplug the left speaker cable by pulling it straight up out of its socket on the logic board.

    • De-route the cable from the gap between the hard drive and logic board.

    • If the gap between the hard drive and logic board is too narrow for the speaker cable, disconnect it and leave the cable in place.

  27. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 28, image 1 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 28, image 2 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 28, image 3 of 3
    • Be careful not to touch any solder joints on the back of the power supply. Capacitors may be charged enough to give you a dangerous shock.

    • Use a spudger to disconnect the power button connector from its socket on the logic board.

  28. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 29, image 1 of 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 29, image 2 of 2
    • Lift the left speaker straight up, until the power button cable is exposed (about 0.5 inches).

  29. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 30, image 1 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 30, image 2 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 30, image 3 of 3
    • Gently de-route the power button cable from its groove in the left speaker.

  30. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 31, image 1 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 31, image 2 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 31, image 3 of 3
    • Lift the left speaker straight up and remove it from the iMac.

    • If the gap between the hard drive and logic board was too narrow to free the speaker cable earlier, gently pull it free as you remove the speaker.

    • Push from the connector end as you pull from the speaker end to thread the cable under the hard drive's right bracket.

  31. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Remove the power supply: step 32, image 1 of 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Remove the power supply: step 32, image 2 of 2
    • 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.

    • Disconnect the power supply control cable from the power supply.

  32. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 33, image 1 of 1
    • Remove the following four screws securing the power supply to the rear case (size T8 or T10 depending on the exact model):

    • Two 23.7 mm Torx screws

    • Two 7.3 mm Torx screws

  33. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 34, image 1 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 34, image 2 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 34, image 3 of 3
    • Do not attempt to remove the power supply from the case; it is still attached to the logic board by two cables.

    • Move the power supply board towards the left edge of the case and up to free it from the notch in the logic board.

  34. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 35, image 1 of 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 35, image 2 of 2
    • Depress the tab on the DC power cable connector, then pull it straight out of its socket on the back of the logic board.

  35. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 36, image 1 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 36, image 2 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 36, image 3 of 3
    • 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 top of the power supply towards you, like opening a mailbox, to reveal the AC inlet cable connector.

    • Disconnect the AC inlet cable connector.

  36. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Remove the right speaker: step 37, image 1 of 1
    • Remove two 9.8 mm T8 screws.

  37. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 38, image 1 of 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 38, image 2 of 2
    • Gently rock the right speaker slightly to the right, to allow access to its cable's connection on the logic board.

  38. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 39, image 1 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 39, image 2 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 39, image 3 of 3
    • Use a spudger to loosen the right speaker cable's connector from its socket on the logic board.

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

  39. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 40, image 1 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 40, image 2 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 40, image 3 of 3
    • Lift the speaker straight up and remove it from the iMac.

  40. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Remove the fan: step 41, image 1 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Remove the fan: step 41, image 2 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Remove the fan: step 41, image 3 of 3
    • Use the tip of a spudger to disconnect the fan cable's connector from its socket on the logic board.

  41. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 42, image 1 of 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 42, image 2 of 2
    • Peel the black tape connecting the fan to the exhaust duct back slightly.

    • Leave the tape in place on the exhaust duct—you only need to expose the joint to free the fan.

  42. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 43, image 1 of 1
    • Remove three 12.4 mm T10 screws securing the fan to the rear case.

  43. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 44, image 1 of 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 44, image 2 of 2
    • Remove the fan from the iMac.

  44. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Remove the logic board: step 45, image 1 of 1
    • Use a T5 Torx screwdriver to remove the two 4 mm screws securing the AirPort/Bluetooth antenna cables.

  45. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 46, image 1 of 1
    • Remove the metal bracket securing the antenna cables to the logic board.

  46. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 47, image 1 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 47, image 2 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 47, image 3 of 3
    • Use a pair of tweezers to disconnect the four antenna cables from the motherboard.

    • 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:

    • Left

    • Top

    • Upper right

    • Lower right

  47. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 48, image 1 of 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 48, image 2 of 2
    • Use a pair of tweezers or your fingers to disconnect the ribbon cable left of the antenna cables from the logic board.

  48. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 49, image 1 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 49, image 2 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 49, image 3 of 3
    • Use the pointed 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.

  49. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 50, image 1 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 50, image 2 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 50, image 3 of 3
    • 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 a pair of tweezers to gently pull the microphone ribbon cable straight out of its socket.

  50. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 51, image 1 of 1
    • Use a T8 Torx screwdriver to remove the two 5.6 mm screws from the top of the heat sink exhaust duct.

  51. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 52, image 1 of 1
    • 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.

  52. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 53, image 1 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 53, image 2 of 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: step 53, image 3 of 3
    • 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.

  53. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Reassembly tip: step 54, image 1 of 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Reassembly tip: step 54, image 2 of 2
    • 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.

Заключение

Compare your new replacement part to the original part—you may need to transfer remaining components or remove adhesive backings from the new part before installing.

To reassemble your device, follow the above steps in reverse order.

Take your e-waste to an R2 or e-Stewards certified recycler.

Repair didn’t go as planned? Check out our Answers community for troubleshooting help.

Еще один человек закончил это руководство.

Sam Omiotek

Участник с: 25.02.2019

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4 Comments

Are these really pictures of a 2020? I don’t think Apple ever sold any of the 2020 units with a rotational hard drive.

James Muir - Ответить

Correct, this is not a 2020 27-Inch iMac.

enoxseven -

I tested the procedure and found that these iMacs were similar enough that reshooting photos was not necessary. As noted in the introduction, some photos in this guide are from a different model and may contain slight visual discrepancies, but they won't affect the guide procedure.

Sam Omiotek -

Hi all,

Because my iMac A2115 with 512GB SSD has a broken logic board, I am searching for the schematics to be able to see which component needs to be replaced on the logic board.

Hopefully someone here can help me out! :-)

Best regards,

Flo

Flo - Ответить

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