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Introduction

This guide details removing the logic board in a 2019 iMac 4K in order to remove or replace the RAM.

Some images in this guide use an older iMac, which has minor visual differences. These differences do not affect the repair procedure.

This guide requires you to handle a power supply that contains large capacitors. Unplug the iMac and hold the power button down for at least 10 seconds to help discharge the capacitors. Handle the power supply board by the edges and do not touch surface components.

    • With the hinge free to move, the iMac will be unbalanced and hard to work on. Place an iMac service wedge, in the stand to stabilize the iMac.

    • 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" Retina 4K Display 2019 RAM Replacement, Insert the opening tool: étape 2, image 1 de 2 iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement, Insert the opening tool: étape 2, image 2 de 2
    • Starting on the left side 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" Retina 4K Display 2019 RAM Replacement, Slice through the display adhesive: étape 3, image 1 de 3 iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement, Slice through the display adhesive: étape 3, image 2 de 3 iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement, Slice through the display adhesive: étape 3, image 3 de 3
    • Use the tool like a pizza cutter—roll it along the gap, cutting the foam adhesive in between the frame and display.

    • Be sure to always push with the cutting wheel forward. 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 21.5" Retina 4K Display 2019 RAM Replacement: étape 4, image 1 de 3 iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 4, image 2 de 3 iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 4, image 3 de 3
    • Continue running the tool up around the top left corner.

  4. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 5, image 1 de 2 iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 5, image 2 de 2
    • Cut the adhesive along the top left of the display.

  5. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 6, image 1 de 2 iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 6, image 2 de 2
    • Continue along the top of the display.

    • You may want to run the tool back and forth a few times to ensure you completely cut through the adhesive.

  6. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 7, image 1 de 3 iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 7, image 2 de 3 iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 7, image 3 de 3
    • Push the tool around the top right corner of the display.

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    • Push the tool down along the right side of the display.

  8. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 9, image 1 de 2 iMac Intel 21.5" Retina 4K Display 2019 RAM 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" Retina 4K Display 2019 RAM Replacement: étape 10, image 1 de 3 iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 10, image 2 de 3 iMac Intel 21.5" Retina 4K Display 2019 RAM 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.

  10. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 11, image 1 de 2 iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 11, image 2 de 2
    • 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" Retina 4K Display 2019 RAM Replacement: étape 15, image 1 de 2 iMac Intel 21.5" Retina 4K Display 2019 RAM 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.

  15. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 16, image 1 de 3 iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 16, image 2 de 3 iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 16, image 3 de 3
    • Slide the plastic card toward the center.

    • Stop sliding just before the iSight camera to avoid damaging the camera.

  16. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 17, image 1 de 2 iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 17, image 2 de 2
    • Wedge the plastic card back into the top left corner.

  17. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 18, image 1 de 3 iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 18, image 2 de 3 iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 18, image 3 de 3
    • 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" Retina 4K Display 2019 RAM Replacement, Display Assembly Cables: étape 19, image 1 de 2 iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement, Display Assembly Cables: étape 19, image 2 de 2
    • 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").

    • Hold the display with one hand while using your other hand to unplug the display power cable.

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    • Continuing to support the display with one hand, 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, keeping it parallel to the motherboard, to avoid damaging it.

  20. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement, Separate the display: étape 21, image 1 de 2 iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement, Separate the display: 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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    • If necessary, a plastic card can be used to cut any remaining sections of the bottom adhesive strip.

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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.

    • After the adhesive is cut, it cannot be used to re-seal the display in place. Follow this guide to replace the adhesive strips that secure the display to the rear enclosure.

  23. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement, Remove the lower support bracket: étape 24, image 1 de 2 iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement, Remove the lower support bracket: étape 24, image 2 de 2
    • Remove the following five Phillips screws holding the lower support bracket in place:

    • Four 3.2 mm screws

    • One 1.7 mm screw

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

  24. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 25, image 1 de 1
    • Remove the lower support bracket (a.k.a. "chin strap") from the iMac enclosure.

  25. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement, Hard Drive Brackets: étape 26, image 1 de 1
    • Remove the following T10 Torx screws securing the hard drive brackets to the iMac:

    • Two 21 mm screws

    • One 9 mm screw

    • One 27 mm 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.

  29. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 30, 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.

  30. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 31, image 1 de 2 iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 31, image 2 de 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.

    • 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.

  32. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 33, image 1 de 2 iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 33, image 2 de 2
    • 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.

  34. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 35, image 1 de 2 iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 35, image 2 de 2
    • 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.

  35. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 36, image 1 de 3 iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 36, image 2 de 3 iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 36, image 3 de 3
    • 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.

  36. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 37, image 1 de 1
    • Remove the power supply from the iMac.

  37. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement, Fan: étape 38, image 1 de 2 iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement, Fan: étape 38, image 2 de 2
    • Gently pull the fan cable connector straight away from its socket on the logic board.

  38. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 39, image 1 de 1
    • Remove the three 10 mm T10 Torx screws securing the fan to the rear enclosure.

    • The uppermost screw has a rubber standoff adhered to its head to support the display—leave this in place.

  39. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 40, image 1 de 2 iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 40, 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.

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    • 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.

  42. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 43, image 1 de 1
    • Remove the hard drive assembly from the iMac.

  43. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement, Remove the hard drive tray: étape 44, image 1 de 1
    • Remove the 7.3 mm T8 Torx screw securing the hard drive tray to the rear enclosure.

  44. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 45, image 1 de 2 iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 45, image 2 de 2
    • Remove the SATA cable from the clips on the back of the hard drive tray.

    • Remove the hard drive tray.

  45. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement, Disconnect the logic board: étape 46, image 1 de 2 iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement, Disconnect the logic board: étape 46, image 2 de 2
    • Gently pull the left speaker cable straight out of its socket on the logic board.

  46. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 47, image 1 de 1
    • De-route the left speaker cable by pulling it straight up out of the retaining clip in the back of the rear enclosure.

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    • Similarly to the previous step, de-route the SATA and power cables by pulling the braid straight up out of the retaining clip.

  48. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 49, image 1 de 2 iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 49, image 2 de 2
    • Peel up the piece of tape connecting the left speaker connector to the SATA power and data cables.

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    • Flip up the metal retaining bracket on the FaceTime camera cable connector.

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

    • This is a delicate connector that can be easily damaged.

  50. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 51, image 1 de 1
    • Remove the two 4.0 mm T5 Torx screws securing the four AirPort/Bluetooth antenna connectors.

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    • Rotate the top of the AirPort/Bluetooth connector bracket away from the logic board, then lift the bracket straight up and remove it.

    • During reinstallation, make sure to line up the tabs on the bottom of the bracket with the holes in the EMI shield. These tabs should seat fully inside the holes before the bracket is installed.

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    • Use the point of a spudger to pry all four antenna connectors straight up from their sockets and disconnect them from the AirPort/Bluetooth card.

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    • Use a pair of tweezers or your fingers to pull the right speaker cable connector straight down and out of its socket on the logic board.

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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 move it out of the way of the logic board.

  55. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 56, image 1 de 1
    • Peel off the tape covering the exhaust duct.

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    • Remove the following T8 Torx screws securing the exhaust duct to the rear enclosure:

    • Two 6.2 mm screws

    • Two 4.7 mm screws

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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.

  58. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement, Remove the logic board: étape 59, image 1 de 1
    • Remove the four 7.3 mm T8 Torx screws securing the logic board to the rear enclosure.

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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 top of the logic board away from the rear enclosure.

    • As you tilt the logic board, pull the right speaker connector to the right and out of the way of the board.

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

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

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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.

    • Use a USB flash drive and/or ethernet cable to keep the logic board seated correctly while you tighten the screws.

  61. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement, RAM: étape 62, image 1 de 1
    • Handling the board by the edges, flip the logic board over to access the two RAM modules.

    • Use a T4 Torx driver to remove the four 2.4 mm screws securing the RAM shield.

  62. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 63, image 1 de 1
    • Remove the RAM shield.

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    • Two clips secure the RAM module in place, one on each side. Using your fingers, spread the clips away from the RAM module.

    • When released, the RAM module will pop up at a slight angle.

  64. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 65, image 1 de 2 iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 65, image 2 de 2
    • Lift the RAM module to an angle of about 30 degrees and slide it out.

    • When handling the RAM module, touch only the outside edges. Take care not to touch the gold-colored contact points along the bottom edge.

    • To install a new RAM module, slide it in place at about the same angle until it is snug, and then swing it downward until the two clips snap into place.

  65. iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 66, image 1 de 2 iMac Intel 21.5" Retina 4K Display 2019 RAM Replacement: étape 66, image 2 de 2
    • The original RAM module closer to the logic board may have a thermal pad adhered to its top side (facing away from the logic board, between the two DIMMs).

    • If your RAM includes a thermal pad, peel it off and transfer it from the original RAM stick to your replacement RAM before you install it in the lower slot.

Conclusion

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.

16 autres ont terminé cette réparation.

Adam O'Camb

Membre depuis le 11/04/2015

165 895 Réputation

418 tutoriels rédigés

10 commentaires

I attempted this upgrade myself because iFixit labeled this as Moderate difficulty. The entire process took me seven hours from start to finish, and when I was done my computer would not turn on. I tried to do this repair myself because my local computer company wanted $400 to do this upgrade using Apple RAM, and I couldn’t afford that at the time. I had to take the iMac in to be serviced when it wouldn’t turn on, and the computer company just quoted me a price of $600 for a new logic board if it was damaged during the upgrade.

I am posting this to warn anyone else who is considering doing this upgrade to hire a certified technician. Do not go by iFixit’s difficulty rating. If you do, you may risk even greater expense if something goes wrong, like it did with my own attempt.

Perhaps iFixit should consider changing the rating on this task to Extremely Difficult, or Advanced, or LOL DON’T EVEN TRY IT to warn any other unsuspecting customers who are looking to save a little money.

Cecily Walker - Réponse

I did this in about 3-4 hours over a Saturday afternoon. I had previously done hard rive upgrades in a 2009 iMac and a 2012 MBP. I was encouraged by a tech friend and pored over the guide for a few times to get my courage up and then discussed the step by step with him first on a zoom call. The courage is required to remove the screen. After that the guide is very solid and clear and the steps are easy to comprehend though removing the power supply is a bit tricky and the microphone cable can be elusive. The only mistake I made is when reapplying the screen, having already checked function, I got into a sweat and banged to sick it on with the VDU cables not properly connected. I would recommend have some help for the screen re application and talk it through so you avoid that kind of schoolboy error. Having removed the screen and re-applied it I am very happy. A great guide.

Jon H Smith

Jonathan Smith - Réponse

Sehr gute Beschreibung, jedoch stellt sich mir eine Frage nach dem Wieder zusammen setzen benötige ich doch einen Vergleichsweisen Kleber der meinen Bildschirm auf den Rahmen setzt. Damit er nicht herunter fällt. Gibt es da welche zu kaufen oder hält das wieder von alleine?

Ich habe einen IMAC 4k 21´Zoll 2019 und möchte gerne Arbeitsspeicher und CPU tauschen.

Michael Meschenat - Réponse

id did it in 3,5 hours, no problems at all, everything works as described.

Josef Niggemeyer - Réponse

I used this instructions to upgrade my iMac with 32Gbytes RAM and 1Tbyte SSD. Everything went well in about 4 hours of hard work. You’ll need the right tools, adhesives to put the screen back and, above all, be very careful with the cables and the logical board, otherwise you’ll have a huge problem! May God bless who created this tutorial!!!! Thank you very much. By the way, fusion drive sucks!

Othon Batista - Réponse

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