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Introduzione

Follow the steps in this guide to remove or replace the logic board in a 21.5" Retina 4K Late 2017 iMac.

Some images in this guide use a 2015 iMac, which has minor visual differences. These differences do not affect the repair procedure.

This guide is marked "potentially dangerous" because it 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 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. 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.

    The wedge is an extremely tight fit for this model. I was worried that the amount of force needed to use it as shown might damage the stand, so I used it with the long side down instead. It worked fine that way and didn’t need anywhere near as much force to insert.

    roberttrevellyan - Replica

    Here’s a good YouTube vid on upgrading the RAM: Can a Normal Person Upgrade the RAM in the 2017 21.5" iMac?

    Dan - Replica

    Here are a couple tips from me:

    1) Expose the adhesive to extreme temperatures. I did this by transporting my iMac in my car, screen-down on a piece of cardboard on a cold February morning (in Chicago). When I went to pick up the iMac, the screen practically fell off the chassis. I would have been distraught by this if I hadn’t already planned this replacement. So it was a happy accident.

    2) Remember to expell the residual power from the power supply by pushing the power button while the iMac is unplugged. This does NOT guarantee it’s safe to touch, but when I accidentally brushed the solder and exposed capacitors, I didn’t get shocked.

    jerrid_foiles - Replica

    Instead of using the wedge, I placed the iMac faced up with the top side (web cam) facing me while I ran the pizza roller around. It worked out great!

    Sam Fung - Replica

    “All iMacs also come with a traditional hard drive” mine doesn’t!! it’s HDD bay is completely empty, no SATA cable or anything. I guess I’ll have to upgrade the PCIe SSD instead.

    Chris Hughes - Replica

    There is no replacement glass for this model, it is part of the LCD and impossible to remove or replace- the entire LCD has to be replaced unfortunately if the glass is cracked or damaged. You will have to Google search for a replacement. Also be careful with some of the lock tight tork screws as I broke one of my screw mounts taking one out.

    Phil Tesone - Replica

    I used this service wedge but also found it a very tight fit. The same stabilization can be achieved by using a big rolled up towel.

    Ernst - Replica

    While this is a good instruction guide, I recommend to also look at OWC’s instruction video about drive installation, before starting the exercise. Those install videos are very detailed and useful.

    Ernst - Replica

  1. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 2, immagine 1 di 2 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 2, immagine 2 di 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.

    Don’t get too worried about starting exactly where the picture says. The glue is stronger in some parts so just start wherever is easier and then work slowly and patiently around in the direction shown.

    Richard Cook - Replica

    As this guide doesn’t cover replacing the adhesive strips, I found referring to the following was useful (noting that it’s not for the same model of iMac, so the modification they mention wasn’t necessary): Sostituzione strisce adesive iMac Intel 21.5" EMC 2544

    Alan Digby - Replica

    It is very easy to crack the glass in front of the LCD during this step. I used the guitar pick, maybe it was too thick… crack is just on the frame but anyway it is disappointing :(

    Nikolay - Replica

    This part of the exercise should be done with extreme patience. I took my sweet time with the opening tool, rolling it through the entire panel and enclosure gap over and over again, until I was very sure no parts were sticking together anymore. And when I thought I was I done, I decided to do it over again.

    Ernst - Replica

    You can "warm up" the adhesive before try to cut it with the tool using a hair dryer. Heat the edges for about a minute, keep moving it so you don't cause stress in the glass. Also the above note.. use the tool and then the cards. Do not use a guitar pick or other objects as the thickness will cause you to break the front glass, which is a bonded part of the display (expensive).

    Carl Schultz - Replica

    In korean, 아이맥 오프닝툴을 이용하여 화면과 뒷본체부 사이에 틈사이, 전원버튼이 있는 디스플레이 왼쪽부터 분리를 시작한다

    Ethan ryu - Replica

  2. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 3, immagine 1 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 3, immagine 2 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 3, immagine 3 di 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.

    Erreur de traduction: "de bas en haut" et non de" haut en bas" sur le côté gauche de l'écran

    Moreau - Replica

    If re-opening a screen that was opened and re-attached using iFixit’s adhesive strips, I would strongly recommend heating it first with an iOpener, heat gun or hair dryer. 20 minutes after attaching with the iFixit adhesive I tried to open it again with the pizza slicer to fix something and cracked the screen on the left-hand side.

    plasticpool - Replica

  3. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 4, immagine 1 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 4, immagine 2 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 4, immagine 3 di 3
    • Continue running the tool up around the top left corner.

    Ne pincez pas l’écran avec l’autre main. Vous exercez une pression inutile sur le verre et empêchez la roulette de couper le joint.

    phfoglia - Replica

  4. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 5, immagine 1 di 2 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 5, immagine 2 di 2
    • Cut the adhesive along the top left of the display.

  5. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 6, immagine 1 di 2 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 6, immagine 2 di 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.

    In this step can I cut along the display without make any damage to the front camera?

    arisnordico - Replica

    Hi! Actually - there is no need to cut the tape around the camera area - there is no tape to cut at all! And so, the way go is easy - just pass 10 mm to the left and to the right from camera and start cutting!

    P.S. Just did the whole procedure to replace a RAM and to add SSD on PSIe an hour ago! Seems to be different reading the instructions... you know - 2/10 and so on. But it's really not that hard, trust me. I'll give it 5/10.

    P.P.S. By the way there is one trick to pass the difficult steps. Any action which requires pulling smth (motherboard, speaker, power supply unit) from the narrow crack (or should i say - slit?) at the bottom of your Imac is really not so easy.

    And the trick is to first remove a thin metal stripe with some kind of insulation on it which held by 5 small (very small!!) screws at the bottom of your Imac. After you done it - it's easy to pull everything! Pay attention to the fact that one of this 5 screws at the center are more shortly than others.

    dv1977 - Replica

    After doing the replacement the adhesive still sticks quite good enough to hold the screen in place. Maybe this isn't rock-solid, but enough for me.

    Mirko - Replica

    I did all steps like this manuell but now the Display wont work only some colered strips are to see! Whats happend??

    Can anybody help me ? Maybe the connector cable is broken?

    djfanta - Replica

    Check both connectors, probably one of them not seated well

    pzhivulin -

    You can add a SATA SSD if you already have a PCIe SSD Factory?

    kaserlik - Replica

    If you're changing cracked EMC 2638 display to new assembly, there's two more steps:

    Step 24: 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 display assembly.

    Step 25: Use the tip of a spudger to unplug bracket of the thermal sensor small cable near display data cable.

    Carefully remove scotch tape covering thermal sensor. Using iSesamo or flat tip of the spudger carefully peel the thermal sensor away.

    pzhivulin - Replica

    omg - forgot to switch the termal sensor from the old display...

    now fan runs like crazy...

    Andrei Balotescu -

    The key thing is to never put any force on the opening tool when working through the tape. Just roll it back and forth with ease.

    Ernst - Replica

  6. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 7, immagine 1 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 7, immagine 2 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 7, immagine 3 di 3
    • Push the tool around the top right corner of the display.

  7. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 8, immagine 1 di 2 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 8, immagine 2 di 2
    • Wheel the tool down along the right side of the display.

  8. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 9, immagine 1 di 2 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 9, immagine 2 di 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.

    Yes, do it many times to loosen the adhesive.

    Noah Ralston - Replica

    Would be good data to show the 3 areas (wifi antennas where the "tape" is larger and covers them. The rest of the "tape" is 1.4" and easy. Also after removing the display, be sure to remove the old "tape" from both the display and the rubber parts of the case. Use the spudger to start an end and it should pull off easily. Careful on the baackside of the display as you can scratch off the black paint/covering.

    Carl Schultz - Replica

  9. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 10, immagine 1 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 10, immagine 2 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 10, immagine 3 di 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.

    this step is extremely important NOT to stick in the cards too far….. doing so, you risk a 600 euro replacement as I experienced………

    Edgar Broekema - Replica

    I drew a 3/8” line on my cards with a marker first.

    Max Romano - Replica

    I’m reading this on the EU store, please change all measurements to cm/mm.

    Morgana Devina - Replica

    @ifixit The next batch of cards you create should have a line printed on the card 3/8” in from the edges. Would make a nice reference.

    Richard Giratd - Replica

    Here’s where OWC provides glass removal suction cups, which is a better solution than plastic cards.

    The suction cups help to easily lift the glass panel, without risking the damaging of any internal wiring that the plastic cards could cause.

    Ernst - Replica

    Better to remove stand wedge at this point? Can’t see from pics

    derekrobinson - Replica

  10. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 11, immagine 1 di 2 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 11, immagine 2 di 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".

    This part must be done very carefully or you can damage the flat cable from display, despite it was under a iron cover.

    Cassio Machado - Replica

  11. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 12, immagine 1 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 12, immagine 2 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 12, immagine 3 di 3
    • 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.

    You don't need to do it like this, simply open the iMac bendidng the LCD completely and use the pizza cutter to remove the adhesive.

    Felix - Replica

    Agreed. The card is too thick to cut through the adhesive in this way. Use the pizza cutter or a sharper blade at this point.

    Max Romano -

    Using glass removal suction cups will avoid running this risk of damaging the camera (or any wiring).

    Ernst - Replica

  12. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 13, immagine 1 di 2 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 13, immagine 2 di 2
    • Wedge the plastic card into the top right corner once again, and leave it there to prevent the adhesive from resticking.

  13. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 14, immagine 1 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 14, immagine 2 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 14, immagine 3 di 3
    • 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 (2017) Logic Board Replacement: passo 15, immagine 1 di 2 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 15, immagine 2 di 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 (2017) Logic Board Replacement: passo 16, immagine 1 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 16, immagine 2 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 16, immagine 3 di 3
    • Slide the plastic card toward the center, again stopping just before the iSight camera.

  16. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 17, immagine 1 di 2 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 17, immagine 2 di 2
    • Wedge the plastic card back into the top left corner.

  17. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 18, immagine 1 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 18, immagine 2 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 18, immagine 3 di 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 (2017) Logic Board Replacement, Display Assembly Cables: passo 19, immagine 1 di 2 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement, Display Assembly Cables: passo 19, immagine 2 di 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.

    It was difficult to remove this connection. I ended up having to gently pull-up vertically a little on the wire side to unsnap it about 1mm and then horizontally wiggle it out.

    delacrj2 - Replica

    I had a difficult time removing this connection. I had to lift the wire-side about 1mm before it unsnapped and then carefully wiggle it out horizontally.

    delacrj2 - Replica

    Can this cable be replaced? I am worried mine is damaged. I have no display after the screen fell and stressed the display flex cables following an SSD upgrade.

    Jeremy Brainard - Replica

    This step should be done with extreme caution and care, as this step 19 is not described in great detail (sorry, author).

    The first (most outward) cable will slide out by gently pulling it by its tabs. The second (inner) cable is more tricky, as the locking lever must be moved backward first, before gently pulling backward on the cable connector. The angled tweezers are useful here, to help lift that locking lever, because fingers are too big for this.

    Ernst - Replica

    be VERY careful and SLOW...take your time. These displays crack VERY easily when removing and they'll spider web on you. I've done probably 20 or so of these and cracked 3 being super careful.....ugh.

    Faslane - Replica

  19. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 20, immagine 1 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 20, immagine 2 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 20, immagine 3 di 3
    • 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.

    Cannot seem to find a replacement cable for this, as I suspect mine is damaged. Can’t even find a part number. Anyone know what it might be?

    Jeremy Brainard - Replica

    https://www.amazon.com/gp/product/B08TTL...

    That's the part I ordered for mine and it seems to work ok. I did make a point of contacting the seller and advising them of my requirement and they ensured I got the right part and it matches the description of the link. Bear in mind I bear no responsibility if yours does not work since I am just sharing what I did and what I ordered. Thanks.

    Jim Stanford -

    I also need that cable.

    cameronjpu - Replica

    It's a little difficult to tell... but looking at the connection to the logic board on the video data cable, are the pins faced up or down?

    On the display, same question since it appears you have to "twist" the cable during the reconnection step.

    Jim Stanford - Replica

  20. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement, Display Assembly Separation: passo 21, immagine 1 di 2 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement, Display Assembly Separation: passo 21, immagine 2 di 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.

    The best way to remove the chin adhesive is to use the tabs at either end (there are two strips that run from each outside corner to near the centre). Carefully pull the tabs up and the strips should peel off.

    Advance Technical Service - Replica

  21. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 22, immagine 1 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 22, immagine 2 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 22, immagine 3 di 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.

    At step 21-22, releasing the adhesive strips from the bottom of the display, I noticed a tab on the outer end of each strip. Pull the tab to remove the whole strip, no need to mess around with the plastic cards!

    roberttrevellyan - Replica

  22. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 23, immagine 1 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 23, immagine 2 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 23, immagine 3 di 3
    • 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 (2017) Logic Board Replacement, Lower Support Bracket: passo 24, immagine 1 di 2 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement, Lower Support Bracket: passo 24, immagine 2 di 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.

    I would recommend that those trying this have the project tray to contain all of the screws.

    Mikkif - Replica

    2 notes for reassembly, carful with screws not to strip the heads as they are really really small, make note to cut a gap in the the adhesive over the whole for the microphone.

    I managed to strip the head of one of the screws when putting it back in. So be carful with them when putting in / taking out. If you strip it on the way out you will need to take a fine drill and rill it out. Going back in, well as long as you never need to strip it down again not a problem.

    The second problem is a real pain, you need to make sure to cut a gap in the adhesive just to the right of Center at the button to allow for the microphone opening. If you don’t, the adhesive tape will stop any real pick up on the Mic, so you just need to cut a small gap in it before putting on the screen. Unfortunately I didn’t find this out (or do my checked before sticking it all back down, so have to pull screen back off and reapply new adhesive with a cut out in it at an other time.

    Andrew Taylor - Replica

    Refer her for more info on the mic / adhesive work around —> Muffled Microphone - iMac 21.5" (mid 2017) - Following Adhesive Strips

    Andrew Taylor - Replica

  24. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 25, immagine 1 di 1
    • Remove the lower support bracket (a.k.a. "chin strap") from the iMac enclosure.

  25. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement, Hard Drive Brackets: passo 26, immagine 1 di 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

    At step 26, when reassembling, it's super easy to over-tighten the 9mm screw and strip the brass ferrule out of its hole in the plastic bracket (%#*@).

    roberttrevellyan - Replica

    Mine has 4 different length screws, the two red colored 21mm screws in this guide are actually two differ lengths

    anonymous 523 - Replica

    Mi imac does not have a HDrive whats the steps to follow?

    Charlie - Replica

  26. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 27, immagine 1 di 2 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 27, immagine 2 di 2
    • Remove the left and right hard drive brackets from the iMac.

  27. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement, Power Supply: passo 28, immagine 1 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement, Power Supply: passo 28, immagine 2 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement, Power Supply: passo 28, immagine 3 di 3
    • 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.

  28. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 29, immagine 1 di 2 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 29, immagine 2 di 2
    • 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 (2017) Logic Board Replacement: passo 30, immagine 1 di 1
    • Remove the two 7.2 mm T8 Torx screws securing the power supply to the rear enclosure.

  30. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 31, immagine 1 di 2 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 31, immagine 2 di 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.

  31. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 32, immagine 1 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 32, immagine 2 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 32, immagine 3 di 3
    • 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 (2017) Logic Board Replacement: passo 33, immagine 1 di 2 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 33, immagine 2 di 2
    • Slide the power supply to the right to clear the screw posts on the rear enclosure.

  33. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 34, immagine 1 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 34, immagine 2 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 34, immagine 3 di 3
    • 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 (2017) Logic Board Replacement: passo 35, immagine 1 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 35, immagine 2 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 35, immagine 3 di 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.

    • Do not let any of the exposed solder joints come in contact with a metal surface, as that can cause a short.

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

    • To disconnect the cable, squeeze the release clip on the back side of the connector, behind the logic board, and pull the connector straight out.

  35. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 36, immagine 1 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 36, immagine 2 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 36, immagine 3 di 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 release 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 (2017) Logic Board Replacement: passo 37, immagine 1 di 1
    • Remove the power supply from the iMac.

  37. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement, Fan: passo 38, immagine 1 di 2 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement, Fan: passo 38, immagine 2 di 2
    • Gently pull the fan cable connector straight out of its socket on the logic board.

  38. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 39, immagine 1 di 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 (2017) Logic Board Replacement: passo 40, immagine 1 di 2 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 40, immagine 2 di 2
    • Remove the fan from the iMac.

  40. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement, Hard Drive Assembly: passo 41, immagine 1 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement, Hard Drive Assembly: passo 41, immagine 2 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement, Hard Drive Assembly: passo 41, immagine 3 di 3
    • 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.

    The newer drives have rubber ends and an adhesive side, be careful removing them if replacing the drive and be sure they are securely pushed back into the holder

    Carl Schultz - Replica

  41. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 42, immagine 1 di 2 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 42, immagine 2 di 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.

    When reconnecting the SATA cable, there is nothing to make the connector hold still, and it is hard to reach, so it took several tries. I ended up taking off the rubber baby buggy bumpers to get more room, and then jamming them back on after getting the SATA connector snugged up.

    bstaud - Replica

    If by rubber baby buggy bumper, you mean left speaker, then yes, I agree. Reinstall the hard drive before the left speaker.

    jerrid_foiles -

    Kudo to @jerrid_foiles! I was going crazy trying to attach the SATA cable until I took the two screws out of the left speaker and slid the top end of it aside by about 3/4 inch. Make the whole process SO MUCH easier!!

    jiclark - Replica

    We solved this by removing the hard drive tray screw, then inserting the cable into the SATA hard drive. Then hold the hard drive a bit out of the way to insert the 7.3mm hard drive tray screw.

    Marjie - Replica

    Agree with this method, found it an impossible task to reconnect the SATA connector until removed the tray screw, then it was relatively easy to reconnect and then replace the tray screw.

    daveedwards -

    Also agree with this method!

    jmorphett5 -

  42. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 43, immagine 1 di 1
    • Remove the hard drive assembly from the iMac.

    When reassembling, I found it easier to loosen the HD tray screw from Step 48 and pull the tray outwards from the left side in order to plug the SATA cable in more easily.

    Cool_Breeze - Replica

    Thanks! I, too, had a hard time reconnecting the SATA cable.

    boboswell -

    I found this helpful too!

    Anwar -

    And DON’T do what I did, which is to remove the left speaker - which can easily lead to breaking the cable between the power on button and the power supply. The cable is routed through a hidden slot at the very bottom of the left speaker

    bsmith1 - Replica

    I did loosen the speaker so I could get a tool behind the SATA cable to push it on to the SSD drive. Otherwise hard to align cable.

    Noah Ralston - Replica

    I found the easiest way to connect the SATA cable was to not screw the plastic hard drive tray down until you plug the drive in. That way you can easily push the connector in and due to the cable you’ve got some wiggle room. You can position the tray then just lift one end of the drive up and secure the screw. Then just push the drive down.

    Chris Caldwell - Replica

    This was the step that I had the most trouble with. I’m used to replacing a hard drive in a MacBook Pro, where the “plug” that you plug the drive into is a rigid thing that you can firmly press the hard drive into.

    With the iMac, the plug is situated on the end of a non-rigid cord, so the plug moves back when you try to snap a drive into it. Also, those two rubber gasket things that you adhere to the side of the drive really make it difficult to maneuver the now-overly-chubby drive towards the plug.

    After must frustration/concern, what I ended up doing was temporarily removing the rubber gasket things, using the “spudger” as kind of a lever behind the “plug on a cord” so that it didn’t move as much, and then pushed the gasket-less SSD into the plug.

    Once I got it connected, I put the rubber gaskets back on the sides of the SSD and kind of coaxed it down into place, using the pointy end of the spudger to get the chubby corner pieces to “sit” correctly in the rigid plastic tray that the SSD kind of rests in.

    Jack OnFlickr - Replica

    From another comment elsewhere on this repair, I *highly* recommend removing the two screws holding the left speaker in place, then sliding it just a tad out of the way to be able to easily attach the SATA cable. You don’t have to move it much to make the whole process so much easier!

    jiclark - Replica

  43. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement, Hard Drive Tray: passo 44, immagine 1 di 1
    • Remove the 7.3 mm T8 Torx screw securing the hard drive tray to the rear enclosure.

    it`s a t10 screw..! ;)

    happymac venezuela - Replica

    I found it easier to connect SATA cable before fixing tray.

    Mārtiņš Jansons - Replica

  44. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 45, immagine 1 di 1
    • Remove the hard drive tray.

    I am following these procedures for the following: iMac Retina 4K - 21.5" - 3GHz Quad Core - Radeon Pro 555 2GB - 4GB/4GB (8GB total - 2 slots) 2400MHz DDR4 SO-DIMM - Mid 2017 - Model: MNDY2LL/A - iMac18,2 - A1418 - 3069. In my case, the SATA cable is clipped into the bottom of the hard drive tray. Pull the hard drive tray up slightly and angle to reveal clips. SATA cable pops out from the side of each clip.

    iannai29 - Replica

    Better yet, after reading Step 49 - no need to remove SATA cable from the bottom of the hard drive tray.

    iannai29 - Replica

  45. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement, Logic Board Assembly: passo 46, immagine 1 di 2 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement, Logic Board Assembly: passo 46, immagine 2 di 2
    • Gently pull the left speaker cable straight out of its socket on the logic board.

  46. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 47, immagine 1 di 1
    • De-route the left speaker cable by pulling it straight up out of the retaining clip in the back of the rear enclosure.

  47. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 48, immagine 1 di 2 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 48, immagine 2 di 2
    • 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 (2017) Logic Board Replacement: passo 49, immagine 1 di 2 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 49, immagine 2 di 2
    • Peel up the piece of tape connecting the left speaker connector to the SATA power and data cables.

  49. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 50, immagine 1 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 50, immagine 2 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 50, immagine 3 di 3
    • Flip up the metal retaining bracket on the FaceTime camera cable connector.

    • Pull the FaceTime 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 (2017) Logic Board Replacement: passo 51, immagine 1 di 1
    • Remove the two 4.0 mm T5 Torx screws securing the four antenna connectors to the AirPort/Bluetooth card.

  51. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 52, immagine 1 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 52, immagine 2 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 52, immagine 3 di 3
    • Disconnect all four antenna connectors by prying them straight up from their sockets on the AirPort/Bluetooth card.

  52. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 53, immagine 1 di 2 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 53, immagine 2 di 2
    • Gently pull the right speaker cable connector straight down and out of its socket on the logic board.

  53. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 54, immagine 1 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 54, immagine 2 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 54, immagine 3 di 3
    • 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.

  54. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 55, immagine 1 di 1
    • Peel off the tape covering the exhaust duct.

  55. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 56, immagine 1 di 1
    • Remove the following T8 Torx screws securing the exhaust duct to the rear enclosure:

    • Two 6.2 mm screws

    • Two 4.7 mm screws

  56. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 57, immagine 1 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 57, immagine 2 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 57, immagine 3 di 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.

    • Gently pull the microphone ribbon cable straight out of its socket.

  57. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 58, immagine 1 di 1
    • Remove the four 7.3 mm T8 Torx screws securing the logic board to the rear enclosure.

  58. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 59, immagine 1 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 59, immagine 2 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 59, immagine 3 di 3
    • 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.

    When repairing, I accidentally broke a small piece of what it seems to be a resistor. Mac still works fine and diagnostics reports no errors. Be careful when removing the mother carefully so it doesn’t hit the aluminium cover.

    Andres Urena - Replica

  59. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 60, immagine 1 di 2 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 60, immagine 2 di 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.

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

  60. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement, SATA Data and Power Cables: passo 61, immagine 1 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement, SATA Data and Power Cables: passo 61, immagine 2 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement, SATA Data and Power Cables: passo 61, immagine 3 di 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.

  61. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 62, immagine 1 di 2 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 62, immagine 2 di 2
    • Grasp the hard drive power connector and gently pull it out of its socket on the logic board.

  62. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement, RAM: passo 63, immagine 1 di 2 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement, RAM: passo 63, immagine 2 di 2
    • 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.

  63. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 64, immagine 1 di 2 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 64, immagine 2 di 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.

  64. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement, Heat Sink: passo 65, immagine 1 di 2 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement, Heat Sink: passo 65, immagine 2 di 2
    • Peel off the four black tamper-evident stickers covering the heat sink mounting screws.

    • Remove the four T10 screws that secure the heat sink from the backside of the logic board.

    • During reassembly, tighten these screws one full turn at a time, alternating in a cross pattern. This will gradually increase the clamping pressure evenly across the surface of the CPU. Continue gradually tightening the screws until they're snug and the entire spring plate lays flat against the logic board.

  65. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 66, immagine 1 di 2 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 66, immagine 2 di 2
    • Lift the heat sink retaining spring and its bracket off the logic board.

  66. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 67, immagine 1 di 1
    • Fully loosen the three captive T8 screws securing the heat sink over the GPU.

    • Remove the two 5.4 mm T8 screws securing the heat pipe to the logic board.

  67. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 68, immagine 1 di 1
    • Note that the CPU will most likely remain stuck to the underside of the heat sink as it's lifted out. Take care not to damage it.

    • Lift and remove the heat sink assembly from the logic board.

    • When reassembling your iMac, remove the CPU from the heat sink and reinstall it separately from the heat sink. This will make sure it's installed correctly and prevent damage.

    • Follow our thermal paste application guide to reapply the thermal paste to the graphics processor (GPU). You should also replace the heavy thermal compound or apply thermal pads to the VRAM chips.

  68. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement, AirPort/Bluetooth Card: passo 69, immagine 1 di 1
    • Remove the two 3.3 mm T5 Torx screws securing the AirPort/Bluetooth card to the logic board.

  69. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 70, immagine 1 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 70, immagine 2 di 3 iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement: passo 70, immagine 3 di 3
    • 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.

    • If the AirPort/Bluetooth card is properly seated, its screw holes should align with those on the logic board.

  70. iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement, Logic Board: passo 71, immagine 1 di 1
    • Only the logic board remains.

    • If your iMac is equipped with the Fusion Drive option, you will also need to remove the SSD from the back side of the logic board and transfer it to your new logic board. Remove the SSD by following these steps.

    • The logic board includes the PRAM battery. If your replacement logic board does not include the battery, you can transfer the battery over from your old logic board by following these steps.

    • When reassembling your iMac, remove the CPU from the heat sink and reinstall it separately from the heat sink. This will make sure it's installed correctly and prevent damage.

    • Follow our thermal paste application guide to reapply the thermal paste to the graphics processor (GPU). You should also replace the thermal compound or apply thermal pads to the VRAM chips.

    • 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.

Conclusione

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

Altre 3 persone hanno completato questa guida.

Adam O'Camb

Membro da: 11/04/2015

163.231 Reputazione

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5 Commenti

Hello, very good explanation .

Got a question please

I have the imac 4k 21.5 late 2015, can I change the motherboard? To be able to upgrade ram, does or fits in the 2015 body and with all parts?

Eleuterio Sousa Ramos - Replica

I did it. Everything went very well, but the two thunderbolt plugs are not working after all. LAn and USb is doing well. Any suggestions about it?

Gunter Holder - Replica

I am running into the same issue after upgrading the RAM and SSD. Have you found a fix?

William Sandidge -

Can the GPU be upgraded?

Mien Yockmann - Replica

Re” I did it. Everything went very well, but the two thunderbolt plugs are not working after all. LAn and USb is doing well. Any suggestions about it?” You need to disassemble the iMac again to the point where the logic board is loose (step 58-59 on this guide). Connect a thunderbolt cable, a USB cable and and ethernet cable to the back of the iMac with the logic board in place but the logic board screws not tightened. This will ensure the ports are correctly lined. Tighten the logic board screws and finish the reassembly (at this point you can disconnect the cables.) . This should solve the problem.

jvilella - Replica

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