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Introducción

Follow this guide to replace the logic board on a 2020 iMac 27" 5K.

Some photos in this guide are from a different model and may contain slight visual discrepancies, but they won't affect the guide procedure.

Removing the display on the 2020 iMac Intel 27" Retina 5K Display requires cutting adhesive with a specialized iMac opening tool. After you've completed your repair, you'll need to follow our [display adhesive guide] to scrape off the old adhesive and replace it with new double-sided adhesive strips.

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.

  1. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Insert an opening tool: paso 2, imagen 1 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Insert an opening tool: paso 2, imagen 2 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Insert an opening tool: paso 2, imagen 3 de 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: paso 3, imagen 1 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Slice through the display adhesive: paso 3, imagen 2 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Slice through the display adhesive: paso 3, imagen 3 de 3
    • Use the tool like a pizza cutter—roll it along through the gap, and it will cut the foam adhesive through the center.

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

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

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

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

  5. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 6, imagen 1 de 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 6, imagen 2 de 2
    • Continue along the top of the display.

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

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

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

  8. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 9, imagen 1 de 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 9, imagen 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 27" Retina 5K Display 2020 Logic Board Replacement: paso 10, imagen 1 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 10, imagen 2 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 10, imagen 3 de 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: paso 11, imagen 1 de 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 11, imagen 2 de 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: paso 12, imagen 1 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 12, imagen 2 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 12, imagen 3 de 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: paso 13, imagen 1 de 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 13, imagen 2 de 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: paso 14, imagen 1 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 14, imagen 2 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 14, imagen 3 de 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: paso 15, imagen 1 de 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 15, imagen 2 de 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: paso 16, imagen 1 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 16, imagen 2 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 16, imagen 3 de 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: paso 17, imagen 1 de 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 17, imagen 2 de 2
    • Insert the card back into the top left corner.

  17. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 18, imagen 1 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 18, imagen 2 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 18, imagen 3 de 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: paso 19, imagen 1 de 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Disconnect the display cables: paso 19, imagen 2 de 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: paso 20, imagen 1 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 20, imagen 2 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 20, imagen 3 de 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.

    on the 2020 model there is also a connector from the camera that is connected ted to the screen.

    Erwin Biermans - Contestar

  20. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Lift the display: paso 21, imagen 1 de 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Lift the display: paso 21, imagen 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.

  21. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Remove the remaining adhesive: paso 22, imagen 1 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Remove the remaining adhesive: paso 22, imagen 2 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Remove the remaining adhesive: paso 22, imagen 3 de 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: paso 23, imagen 1 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Remove the display: paso 23, imagen 2 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Remove the display: paso 23, imagen 3 de 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: paso 24, imagen 1 de 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Remove the support bracket: paso 24, imagen 2 de 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.

    These are new steps from when I did this on my late 2015 retina iMac so I believe step 25 and 26 are optional (you can cope without doing it).

    Amuseme - Contestar

    I did not find it necessary to remove these screws and this bar

    James Orwin - Contestar

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

    No comments on this ?[br]

    It's quite possibly the most difficult part to put back in the entire process

    The screws are tiny and the there is no easy way to line up the holes on the bracket with the screws

    Having got this far - it wasn't even all that necessary to remove this part in the first place

    Severe pain in the neck

    Eoin - Contestar

    After an hour of painstaking mess - I managed to get 7 out of the 9 back in

    By that time I could care less about the remaining 2

    Eoin - Contestar

    With the right tools and technique, the bracket can easily be replaced in under a couple of minutes.

    Use a screwdriver with a magnetized tip which frees up one hand and place a screw on the tip first.

    Then line up the screw hole on just one end of the bracket and using a pair of tweezers from the side, hold the bracket in place while you put in the screw.

    Next, do the same on the other end of the bracket. After that, all of the screws in the middle are quick to replace. I didn't really have to touch the bracket again after the end screws were in place.

    Hope that helps someone else since removing this bracket does make later steps a bit easier.

    Max Z - Contestar

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

    I found i didn’t need to remove the speaker nor the hard drive. In fact I managed to remove the old PSU without even removing the chin strap. However, to install the replacement PSU, I had to remove the chin strap. So I would say, remove the chin strap, but you can optionally leave the speaker and hard drive in.

    Cool_Breeze - Contestar

  26. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 27, imagen 1 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 27, imagen 2 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 27, imagen 3 de 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.

    I didn’t unplug and de-route this cable. Later, Step 29, has you remove the left speaker. This isn’t necessary. If you can just move the speaker over to expose the hard drive mounting screws, so if you’re not going to remove the speaker, you don’t need to unplug it.

    Anthony Zimmerman - Contestar

    on the 2019 iMac, it is horizontal not vertical so pull it horizontally out.

    tarex7 - Contestar

  27. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 28, imagen 1 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 28, imagen 2 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 28, imagen 3 de 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.

    Can someone explain what are the solder joint? Or tell me what it looks it?

    brianyu - Contestar

    The silver spots on the circuit boards. You may not want to tackle this alone. If you touch these areas, you can possible get a shock -- harming you and your computer.

    Robert -

    there is no need to disconnect the speaker, just unscrew it and move aside slightly to reach the HDD screws (about 5mm) - if you want to replace just the main HDD

    Thomas Webb - Contestar

    Take note of exactly what direction this tiny little wire was.

    Joseph Ashe - Contestar

    The connector has a plain black side and the other side you can see the 2 silver connectors.. the side you can see the 2 silver connectors faces the front.. the plain side is to the back/against the logic board.

    paul.lynch1 -

    If I leave my iMac unplugged for an extended period, say 24 or 48 hours, is it still possible to get an electric shock from the PSU? Do the capacitors eventually discharge?

    Dominic Pettifer - Contestar

    make sure you’ve actually unplugged the mac when running this cable, and not had it plugged in to test the diagnostic LEDs, because one of those wee silver spots is carrying 230v, and its 6mm away from the place the cable runs, So if you have fat fingers like mine, that’s a free wake up zap

    flow in - Contestar

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

    This is MUCH easier to do if the support bracket along the bottom is removed first. See Reemplazo de Placa Lógica del iMac Intel 21.5" Retina 4K Display (2017) step 25.

    Use a P00.

    To replace it, introduce it like in the photo at the link to be able to hold the right most holes of the chassis and bracket. Replace the first screw, align the bracket to the horizontal and add the screws from right to left. Each one will bring up the next hole in the bracket close enough to screw through. Reverse those directions if you are a leftie.

    Andrew Gough - Contestar

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

    Pay attention: if pulling out the loudspeaker tear off the wire of the power button, Apple have not any service parts except for the whole rear housing!

    Fabio Braga - Contestar

    This is MUCH easier to do if the support bracket along the bottom is removed first. See Reemplazo de Placa Lógica del iMac Intel 21.5" Retina 4K Display (2017) step 25.

    Use a P00.

    To replace it, introduce it like in the photo at the link to be able to hold the right most holes of the chassis and bracket. Replace the first screw, align the bracket to the horizontal and add the screws from right to left. Each one will bring up the next hole in the bracket close enough to screw through. Reverse those directions if you are a leftie.

    Andrew Gough - Contestar

  30. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 31, imagen 1 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 31, imagen 2 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 31, imagen 3 de 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.

    I found it wasn't necessary to remove the speaker from the left side to remove the hard drive. You can remove the screws, and then slide it over to the left — giving more than enough room to access the hard drive.

    Robert - Contestar

    me too. don't need to remove it if you only want to change the hd

    Alber Einsten -

    Agreed, wast of time to fully remove the speaker.

    Matthew Gonzalez -

    It is difficult to remove the bottom of the speaker because it bends into the frame. Be careful to remove the power button cable, which also routes in a channel in the bottom of the speaker.

    Eric - Contestar

    easier to remove the speakers if you unscrew the front ‘chin strap’ - 6/9 phillips screws that you can see in the picture hold that aluminum piece in place

    flow in - Contestar

    Agree. This is MUCH easier to do if the support bracket along the bottom is removed first. See Reemplazo de Placa Lógica del iMac Intel 21.5" Retina 4K Display (2017) step 25.

    Use a P00.

    To replace it, introduce it like in the photo at the link to be able to hold the right most holes of the chassis and bracket. Replace the first screw, align the bracket to the horizontal and add the screws from right to left. Each one will bring up the next hole in the bracket close enough to screw through. Reverse those directions if you are a leftie.

    Andrew Gough -

    The trick with removing the left speaker is that you have to slide it up toward the top of the iMac (continuing to de-route the power button cable carefully as you go) to get it out from under the chin before you lift it up to remove it.

    ace - Contestar

  31. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Remove the power supply: paso 32, imagen 1 de 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Remove the power supply: paso 32, imagen 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.

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

    I found this cable very difficult to disconnect, be very careful because the cable is between a black tape and it's stuck very hard to the logic board and the cable is very short and you don't have space to move and separate it from the connection! Be patient and take the time you need

    MrSchaeffer - Contestar

    I found than putting the flat end of the spudger at the center of the cable, and tilting it got the cable out without an issue.

    jimboom006 - Contestar

    I was able to use the flat end of the spudger on the sides. You can see a tiny little clip on each side. Be very gentle!

    Joseph Ashe - Contestar

    I simultaneously used the fingernails on my 2 index fingers to dislodge the tabs and continue to pull the cable out. It took a couple seconds.

    Eric - Contestar

    ultimately the trick for me was to just pull hard enough, but that part is the scariest part. any tips welcome

    Boris - Contestar

    These connectors seem pretty tough to remove until one understands the latch. Each side of the plug are two little sprung tabs (the tab is part of the spring clip which runs down the side of the plug on each side - makes sense once you see the removed plug!). Squeeze them in towards each other and then gently pull the plug from the socket. No great force, or even the spudger, needed once that is done.

    Pete Mackenzie - Contestar

    One more tip, has worked on other cables for me. Fish the skinniest spudger tip you have under the cable, and with a finger of your other hand put opposite pressure on the cable against the spudger and gently work it out

    Mike Fleming - Contestar

    If u are right handed, i can recomend to use your index left nail to press de bottom sprung, and a flat spudger on the right hand, came off so easy

    Davo Montiel - Contestar

  32. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 33, imagen 1 de 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: paso 34, imagen 1 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 34, imagen 2 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 34, imagen 3 de 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.

    This is MUCH easier to do if the support bracket along the bottom is removed first. See Reemplazo de Placa Lógica del iMac Intel 21.5" Retina 4K Display (2017) step 25.

    Use a P00.

    To replace it, introduce it like in the photo at the link to be able to hold the right most holes of the chassis and bracket. Replace the first screw, align the bracket to the horizontal and add the screws from right to left. Each one will bring up the next hole in the bracket close enough to screw through. Reverse those directions if you are a leftie.

    Andrew Gough - Contestar

    The top right screw on the power supply actually screws into a stand-off screw connected to the back of the iMac case. Once you have removed the 4 x Torx 8 or 10 screws you can move the power supply enough to see the upper face of it.

    It has a Torx 25 slot in it and comes out easily. This will give you a lot more room for your fingers in Step 40, depressing the tab on the DC power cable connector to pull it out, and when replacing it on reassembly. You may find it won’t require you removing the support bracket as in the suggestion above.

    John Blagden - Contestar

  34. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 35, imagen 1 de 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 35, imagen 2 de 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.

    Remember to push in the disconnect tab on the large connector. Carefully insert your finger and push on the tab before you pull on the connector.

    Manuel Collazo - Contestar

    Thank you Manuel, this was a tricky one.

    David Zemsky - Contestar

    Yes, I pulled the whole socket out because I didn’t know about the tab. Fortunately I was able to place it back in. Not sure if it was glued or how it was anchored but it seems to have a solid connection and I can’t easily pull it out by hand. Once I plug the power cable back in should be ok.

    P. Hisada - Contestar

    This connector was very difficult for me to remove (even after pushing the disconnect tab). Eventually I had to use a pair of needle nose pliers to wiggle it back and forth out of the socket. A lot of the cables on the my late 2015 model were very tight and a struggle to get out.

    Anthony Zimmerman - Contestar

    I'm struggling with this step. I presume that the tab to which you are referring is behind the connector. I can see a plastic protrusion there but it does not move when I push it. Just to get my finger behind it requires the power board to be moved quite a bit btw.

    Dave Sands - Contestar

    Pressing on the release on the back with my finger and at the same time using a needle nose pliers to wiggle the connector with my other hand worked for me.

    Kimbo M - Contestar

    i could not get it out by the force of my fingers, so what i did was slightly turn the imac 90 degrees so i could reach the area better, push up (so, vertically) the power control board, push in the tab on the bottom of the connector with my right hand, and slightly wiggle the connector out of its socket with a plier

    Boris - Contestar

    removing the chin strap (the front bit of metal running along the bottom of where the screen was) makes this much easier as you can rotate the board and get to the underside

    flow in - Contestar

    Left index finger pushing on the tab from behind the connector, using needle pliers in right hand to rock up & down did the trick thanks @starfleet_tone

    Frédérick Charette - Contestar

    Just be careful! I’ve seen two systems where the socket was pulled fully off! So the logic board then needs repairs or replacing being just a bit too aggressive!

    Dan -

    Needle nose and wiggling worked for us too. We were stuggling like heck with it when just using hands!

    Mike Manasewitsch - Contestar

    This is MUCH easier to do if the support bracket along the bottom is removed first - more space to angle the board upwards. See Reemplazo de Placa Lógica del iMac Intel 21.5" Retina 4K Display (2017) step 25.

    Use a P00.

    To replace it, introduce it like in the photo at the link to be able to hold the right most holes of the chassis and bracket. Replace the first screw, align the bracket to the horizontal and add the screws from right to left. Each one will bring up the next hole in the bracket close enough to screw through. Reverse those directions if you are a leftie.

    Andrew Gough - Contestar

    I did as Andrew Gough did, per other videos reviewed. Removed it right away. Just makes things easier, more space for just a few screws :)

    Mike Rehbein - Contestar

    The top right screw on the power supply actually screws into a stand-off screw connected to the back of the iMac case. Once you have removed the 4 x Torx 8 or 10 screws you can move the power supply enough to see the upper face of it.

    It has a Torx 25 slot in it and comes out easily. This will give you a lot more room for your fingers in Step 40, depressing the tab on the DC power cable connector to pull it out, and when replacing it on reassembly. You may find it won’t require you removing the support bracket as in the suggestion above.

    John Blagden - Contestar

    The tab is a pain in the a$$$ to get your finger in there. I was so horrified at the size of the capacitors that I put on gloves to reduce any amount of shock :-) . To get it loose I would pull out carefully the power board as far as I could than I wedge my index finger under and press the tab and slowly pull until I saw a slight gap between the end of the socket and the plug. I than place the flat part of the black spudger or blue one into the gap and use as it as a wedge to help move the plug forward as I kept the tab pressed.

    Andrew Phillips - Contestar

  35. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 36, imagen 1 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 36, imagen 2 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 36, imagen 3 de 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.

    To reassemble, do the same in reverse but keep power supply board more upright than slanted down when re-inserting it in to the lower right corner. The lower right screw post has an protrusion under/behind it and the Power Supply's small 2 wire plug must fit between the front of your Mac and the obstruction. Then it just slides right in and then screw it down.

    Dan H - Contestar

    There is a small release tab on the cable.

    Eric - Contestar

    Wear gloves when doing this to reduce any shock. The size of those capacitors are very unnerving and scary. Also those solder joints.

    Andrew Phillips - Contestar

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

    These are T10's, not T8's

    loren - Contestar

  37. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 38, imagen 1 de 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 38, imagen 2 de 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: paso 39, imagen 1 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 39, imagen 2 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 39, imagen 3 de 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: paso 40, imagen 1 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 40, imagen 2 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 40, imagen 3 de 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: paso 41, imagen 1 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Remove the fan: paso 41, imagen 2 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Remove the fan: paso 41, imagen 3 de 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: paso 42, imagen 1 de 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 42, imagen 2 de 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: paso 43, imagen 1 de 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: paso 44, imagen 1 de 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 44, imagen 2 de 2
    • Remove the fan from the iMac.

    Use a piece of tape around the antenna cables to keep them in the same order, makes reassembly a little easier.

    Walter Hayden - Contestar

    On reassembly, start the fan power connector into its socket while you slide the fan in.

    ebay - Contestar

    I left the antennas attached to the wifi card and removed the wifi card with wires attached. I accidentally broke one of the connectors on the wifi card and had to replace the entire card....

    S. Baxter - Contestar

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

  46. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 47, imagen 1 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 47, imagen 2 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 47, imagen 3 de 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: paso 48, imagen 1 de 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 48, imagen 2 de 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: paso 49, imagen 1 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 49, imagen 2 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 49, imagen 3 de 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: paso 50, imagen 1 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 50, imagen 2 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 50, imagen 3 de 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: paso 51, imagen 1 de 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: paso 52, imagen 1 de 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.

    Where is the small SSD drive here?

    edo fuenzalida - Contestar

  52. iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 53, imagen 1 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 53, imagen 2 de 3 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement: paso 53, imagen 3 de 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: paso 54, imagen 1 de 2 iMac Intel 27" Retina 5K Display 2020 Logic Board Replacement, Reassembly tip: paso 54, imagen 2 de 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.

Conclusión

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.

Sam Omiotek

Miembro Desde 25/02/19

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4 comentarios

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 - Contestar

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 - Contestar

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