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Introduction

The GPU and CPU share a heat sink and exhaust vent. Use this guide to remove the entire unit from the logic board. Don't forget to apply a new layer of thermal compound before reassembling your iMac.

Follow our thermal paste guide for instructions on cleaning and preparing the thermal surfaces and applying a new layer of thermal compound onto the CPU and GPU dies.

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. 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 no more than 3/8" (9.5 mm) into the display. You risk severing antenna cables and causing serious damage. 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" (9.5 mm) into the display. You risk severing antenna cables and causing serious damage.
    • 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 no more than 3/8" (9.5 mm) into the display. You risk severing antenna cables and causing serious damage.

    Would a heat gun make this step easier? Or damage the iMac?

    Clark Green - Réponse

    A heat gun wouldn’t help you here as you still need to cut though the adhesive. You also risk damaging the display with the excessive heat.

    Dan -

    Removing the original adhesive is easier than removing newly applied adhesive (e.g., if you have to reopen iMac).  If you should happen to need to reopen the iMac, please use extreme caution and highly consider my suggestions below.

    When using the pizza cutter tool, do the first few steps in reverse starting with step 8.  Starting on the left side is better since this is where the adhesive is narrowest.  The right side has two antennas and the top right has one, see the pictures for step 18-21, they are the brass colored metal rectangles near the edges.  The adhesive on these pieces are wider and therefore have more holding power.  The thickness of the pizza cutter tool is enough to crack the glass.

    Walter Hayden - Réponse

    Continuing from my previous comment.  To remove the adhesive on the right side you’ll need to create a very slight gap to give the pizza cutter some more room.  Do this by cutting the adhesive on the left side up and around to the camera.  Before attempting to cut the right side. Carefully slide the plastic cards (I purchased two sets) to ensure the adhesive on the left top and side is completely free.  Now slowly move towards the right side.  After every inch or two of removing new adhesive, slide the card over to create this slight gap.  Be careful to not move the card too close to where the adhesive has not been cut.  You want to create a very slight gap without creating too much pressure.  Use extra caution with approaching the areas where the antenna are since the adhesive is stronger here and will need some additional cutting.  Follow this approach all the way around the right side.  Be careful to not create too much pressure at any one time.  Good Luck!.

    Walter Hayden - Réponse

    I can confirm with Walter - trying to remove freshly applied adhesive is WAAAAY harder! My pizza cutter didn’t work correctly (the circle became a rectangle!) and I ended up with a small crack on the left of my screen. Dang it!

    Benon Koebsch -

    I would highly, highly, highly recommend AGAINST doing this at home. I followed these instructions to a T, and still somehow managed to have the screen not be able to turn on after the hard drive replacement. Then, once you’ve opened your Mac yourself, Apple will refuse to fix anything on the computer, and even other third party, Apple-authorized repair facility will refuse to repair it for you, and you will have to locate a non-authorized Apple repair facility. There, I am having to pay ~$600 to fix things that got screwed up, even though I followed the instructions here to a T, step by step, and did everything slowly and methodically.

    Beware, if you’ve never done this before, that be locked out of ever being able to use an Apple repair facility, or Apple-authorized repair facility, if you mess things up here now.

    Luke Gibson - Réponse

    I performed this on a Late 2015 iMac and there weren’t any significant differences to these steps, but I did find the repair to be nerve-wracking. My model cost nearly $3,000 and about 10 steps into this guide (which I did fully read ahead of time) I was thinking, “what have I got myself into?” But I didn’t rush and happily I’m typing this on my repaired iMac! I found a video from OWC that was more useful than the photos in this guide for certain steps: https://vimeo.com/139364064

    Anthony Zimmerman - Réponse

    First impressions so far: yes it can be a bit nerve wrecking if it is your first time doing this sort of thing and even with lots of experience with a 2011 model it’s still a bit unsettling haha (nervous laughter).

    What I recommend: use a guitar pick to start cutting the glue. You’ll need a bit of pressure so do just the tip.

    Once you’ve done the whole perimeter (minus bottom) do it again but now it should be easier to go deeper so go very slow and careful. Then get the old suction cups used to open older models and start lifting the display very carefully to see where it’s still glued and cut those as well.

    Then you should be done and now the real fun begins! :D

    Carlos Ferrari - Réponse

    It’s ridiculous. Apple should pay for doing this. Like glue parts together to block a repair / make difficult. I smashed my iMac. FU Apple. Seriously, every product I owned had hardware issues. For example, bad solder joints. Never again Apple. I’m happy with Windows and in 2018 / 2019 there are many other manufacturers with high quality stuff. Apple is dying, if they do not change …

    Depple - Réponse

    NOTE: I followed every step word for word, but the adhesive strips supplied are as bad as double sided tape. Within 48hours the screen had slipped off and cracked. Now I need to fork out for a new screen and try again.

    Not sure what to try next time with strips? Perhaps a bit of glue to help hold it??

    Dan Kelly - Réponse

    Where do i get the “iMac Opening Tool?” its neither in the list of tools nor could i find it on the tool page.

    Patrick Cella - Réponse

    Hi @snappadoodle! The opening tool is included in the adhesive kit included in the tool list, but you can purchase it separately here.

    Sam Goldheart -

  2. 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.
    • 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.

    I found the 'pizza cutter' surprisingly smooth at cutting through four-year-old adhesive.

    Gerry - Réponse

  3. Continue wheeling the tool up around the top left corner. Continue wheeling the tool up around the top left corner. Continue wheeling the tool up around the top left corner.
    • Continue wheeling the tool up around the top left corner.

  4. Cut the adhesive along the top left of the display. Cut the adhesive along the top left of the display.
    • Cut the adhesive along the top left of the display.

    The pizza cutter will sink in all the way to the tool handle when the adhesive is full cut, but don’t feel you have to do this in one motion. Some parts cut easier and some require a lot (like 20x) of gentle back and forth.

    Anthony Zimmerman - Réponse

  5. 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.
    • 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. Push the tool around the top right corner of the display. Push the tool around the top right corner of the display. Push the tool around the top right corner of the display.
    • Push the tool around the top right corner of the display.

  7. Wheel the tool down along the right side of the display. Wheel the tool down along the right side of the display.
    • Wheel the tool down along the right side of the display.

  8. 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.
    • 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. 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.
    • 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.

    I actually DESTROYED my display (black vertical strips) by pushing the card in a bit TOO DEEP. So it is REALLY important to insert the card only a bit (1-2mm) more than the cutter wheel, in particular at the top side, where many flat cables connect the panel with the PCB. These can be damaged very easily!

    Peter Fischer - Réponse

    Same thing with me…. Pushed cards to far…. new panel needed…€600…..

    i think ifixit needs to place a bigger caveat, as I have missed it the first time

    Edgar Broekema - Réponse

    i successfully upgraded two imacs. one opened with ifixit pizza knife and another with a regular paper knife. however, when i had to open the first one once again i broke its screen glass. it seems ifixit adhesive strips are too strong. next time i’ll try to use heater to weaken glue tension.

    Eugene Kharkov - Réponse

    I broke one too. And even if you think you did it correctly, you’ll not be able to see where you might have gone too far. You would think it’s very protected behind that metal plate, but no. Take special care with this offence to “right to repair” This should have been designed WAY better. I mean replacing a hardrive that is very likely to fail over the course of time, or even a simple desire to upgrade to an ssd!.

    Bummer

    Denis Sytmen - Réponse

    HINT: If you turn the card and use the blue part of it, then you can avoid going to deep: no further then the blue part …

    Barthold - Réponse

    I’m thinking I might just use vinyl tape to keep the screen in place for at least a little while after an upgrade. The extra strength of the replacement tape sounds scary.

    Art Hackett - Réponse

  10. 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).
    • 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).

    My children tend to collect cards like this from hotels, Disneyland, old IDs, iTunes cards, gift cards etc. They came in handy for this step. After wedging in the first card into the left corner, I wedged the left corner, then added cards along the bottom edge. Finally I continued to push in additional cards to existing cards and found that this created a smooth even pressure along the display top. At 2-3 card-thickness the last of the adhesive let go, gentle as a baby.

    Anthony Zimmerman - Réponse

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

    was denn jetzt? Vor der Kamera aufhören, oder in Richtung Bildschirmmitte schieben, um DEN REST zu entfernen? Wenn ich vor der Kamera aufhöre, kann ich nicht alles an Kleber entfernen.

    Julia S. - Réponse

  12. Put the card into the corner again and let it stay there to keep the adhesive from resettling. Put the card into the corner again and let it stay there to keep the adhesive from resettling.
    • Put the card into the corner again and let it stay there to keep the adhesive from resettling.

  13. Insert a second card into the gap between the display and frame in the top left corner. Insert a second card into the gap between the display and frame in the top left corner. Insert a second card into the gap between the display and frame in the top left corner.
    • Insert a second card into the gap between the display and frame in the top left corner.

  14. 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.
    • 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. Slide the plastic card toward the center, again stopping just before the iSight camera. Slide the plastic card toward the center, again stopping just before the iSight camera. Slide the plastic card toward the center, again stopping just before the iSight camera.
    • Slide the plastic card toward the center, again stopping just before the iSight camera.

  16. Insert the card back into the top left corner. Insert the card back into the top left corner.
    • Insert the card back into the top left corner.

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

    • 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.

    I would recommend using suction cups at this stage to lift the display.

    Marco De Palma - Réponse

  18. 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").
    • 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").

    Mark all cable connectors with a spot of white correction fluid before removal. This will remove the risk, when reinserting them later, of getting them the wrong way round. Yes - I know they will only plug in one way round, but it does make life easier if you are not in perfect lighting!

    Alastair Lack - Réponse

    At this step, if you mess up anything with these 2 cables, especially when plugging them back in, even if you think you’re following the instructions here to a T, then you’re screwed.

    I would highly, highly, highly recommend AGAINST doing this at home. I followed these instructions to a T, and still somehow managed to have the screen not be able to turn on after the hard drive replacement. Then, once you’ve opened your Mac yourself, Apple will refuse to fix anything on the computer, and even other third party, Apple-authorized repair facility will refuse to repair it for you, and you will have to locate a non-authorized Apple repair facility. There, I am having to pay ~$600 to fix things that got screwed up, even though I followed the instructions here to a T, step by step, and did everything slowly and methodically.

    Beware, if you’ve never done this before, that be locked out of ever being able to use an Apple repair facility, or Apple-authorized repair facility, if you mess things up here now.

    Luke Gibson - Réponse

    The display cable, the wider one, has a lock on it , usually a plastic tape lift tab to release it, once thats flipped it should come out fairly easily, if your experiencing resistance and the cable isn’t coming out then check for this lock/latch, the power cable just pulls out, just don’t rush it everything should go fine, fairly easy to do with the end result a working iMac

    Ed tabickman - Réponse

    Is it possible to replace the power cable if its damaged? I can’t seem to find anything about this.

    Joseph Orr - Réponse

  19. 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.
    • 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.

    I replaced HDD to SSD and assembled parts again. When I boot up the iMac, I found black lines on display (looks partly not broken).

    I searched Internet, and some says graphic card problem, but I didn't touch anything but cable to lift up.

    Could the damaged display data cable cause this situation? I hope I could fix this by just replacing the cables..

    chansung park - Réponse

    Sorry, Black lines is a damaged display assembly ;-{ In the process of removing it you either pushed the tool into deep or you torqued the glass severing the tiny wire traces.

    Dan -

    Same trouble here, is it cable trouble or connector trouble?

    redfoxydarrest - Réponse

    Sorry damaged display

    Dan -

    I think whenever words like "...is a delicate connection that can be broken. Be sure to pull the [cable in a certain direction] ANYTIME.... It is worth either a closeup or 2, maybe one with annotations or insertion directions and maybe a motion direction arrow with the something like and 'X' char or a circle division slash over the wrong one.

    john - Réponse

    I agree! +1

    Jim Reitz -

    Yes, John is absolutely correct on this one. I damaged the display cable trying to get it back in. A close up would have helped and now my computer might have actually been fixed.

    Marsha Giardina -

    [|There are 2 cables to disconnect on my Mac (?). Also, I don’t see a metal retaining bracket. I can take a picture, but cannot attach. I got the glass loose with no problem, but am worried about damaging the cables]

    Jim Kelly - Réponse

    Hi Jim! You can go to our Answers Forum to post some better images of your situation!

    Sam Goldheart -

    At this step, if you mess up anything with these 2 cables, especially when plugging them back in, even if you think you’re following the instructions here to a T, then you’re screwed.

    I would highly, highly, highly recommend AGAINST doing this at home. I followed these instructions to a T, and still somehow managed to have the screen not be able to turn on after the hard drive replacement. Then, once you’ve opened your Mac yourself, Apple will refuse to fix anything on the computer, and even other third party, Apple-authorized repair facility will refuse to repair it for you, and you will have to locate a non-authorized Apple repair facility. There, I am having to pay ~$600 to fix things that got screwed up, even though I followed the instructions here to a T, step by step, and did everything slowly and methodically.

    Beware, if you’ve never done this before, that be locked out of ever being able to use an Apple repair facility, or Apple-authorized repair facility, if you mess things up here now.

    Luke Gibson - Réponse

    Can anybody upload an image of how the display can get damaged from removing it? I find it hard to believe (though I’m reading the horror stories here) that a whole display can get damaged. Especially when many of us were following to a T and being VERY CAREFUL.

    Thanks.

    Bryan - Réponse

    First: During reassembly, I highly recommend you connect these cables and do a test boot BEFORE you remove the protective tape on the adhesive strips. That way you can fix any issues(like a damaged cable) if something is not right and you have not re-glued the screen back down which will cause a problem. If you have a second person and everything is working after test boot, you can just leave the cables connected, lift the bottom of the screen and have 2nd person pull the protective tape on the adhesive strips and you can set the screen in place. Second I damaged the video data cable during reassembly on my late 2015 iMac- I did not get the connector straight and I damaged the wires on the cable. I recommend you have someone else hold the screen while you attach the cables - they are fragile. Luckily, the data cable was easily replaced for only about $20. If you must do this by yourself, just be careful I highly recommend have 2 people at this step during reassembly.

    Chip T - Réponse

  20. 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.
    • 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.

    • Remove as much of the adhesive as possible by grabbing it at the outer edges, and then pulling or rolling it towards the middle.

    Thank you Stef, that's what i will do next time, i cracked the lower part of the screen went opening very slowly, that's probably why those "tabs are for !!

    dforgues - Réponse

    Thanks Stef, this has saved me! Simple yet very effective.

    David Zemsky - Réponse

    Yep, I cracked the lower corner of the display as well. I failed to work the adhesive enough to loosen it sufficiently. Be careful, I just had to buy my customer another screen!

    Peter Haigh - Réponse

    There seems to be missing a step or two. As I was removing the old display, there are two wires that need to get transferred to the new replacement display. There is not note about these two wires located at the top of the display. The 1.128-inch ribbon cable and then this other 4-inch long, two-wire cable that goes to a very small circuit board that is 1/4 by 3/8 of an inch and seems to be adhered to the panel.I have not been able to get this cable off the old display. There is a port for it on the replacement display.

    Note: When ordering this screen, and plastic cards as noted tools, ifixit.com did not list the pizza cutter or the new replacement adhesive strips. So now I’m not sure how to get the new one on and secure.

    Todd Derek - Réponse

    The adhesive strip along the bottom is designed with a pull tab on each outer end. Rather than lever and pull the screen simply carefully pull the tab which removes that half of the lower adhesive strip and frees up the screen.

    Andrew Stephens - Réponse

  21. If necessary, a plastic card can be used to cut any remaining sections of the bottom adhesive strip. Be very careful not to touch the capacitor leads or any exposed solder joints on the back of the power supply (boxed in red). Be very careful not to touch the capacitor leads or any exposed solder joints on the back of the power supply (boxed in red).
    • If necessary, a plastic card can be used to cut any remaining sections of the bottom adhesive strip.

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

    Would have been helpful to box the same red area when using the plastic card to separate the glue. Since the red blocked picture is inverted, if someone doesn't pay close attention it may not be obvious that the area of concern is at the right top of the graphic pictures in which the plastic card use is being demonstrated..

    Wizbang FL - Réponse

    you don't need to cut the bottom part as the bottom tape is stuck on each side and you can easily pull it out

    Thomas Webb - Réponse

    What is the twisted wire taped to the back of the display that can bee seen in the upper right of the first two pictures? I have an 27” iMac without a screen an my replacement does not have this wire. I think it is a temperature sensor but do not know where it connects to.

    Eric - Réponse

    [|I opened up my iMac and there’s no HDD or SSD in that spot. its just empty.]

    John Warmann - Réponse

    Please update the picture to include the RED BOXED IN AREA that you refer to on all three pictures in this step. I have had a few zaps from these supplies and it is not pleasant.

    Charlie Nancarrow - Réponse

    J’ai réussi à intervenir dans l’iMac sans décoller l’ensemble de l’écran. Je l’ai ouvert en laissant la dernière partie collée (vers le logo Apple) et qui sert comme une charnière. Bien calé et assuré l’écran n’a pas bougé et j’ai pu changer mon disque dur facilement. Le grand avantage et d’avoir l’écran toute suite juste quand on le recolle par la suite.

    David Mariaux - Réponse

    Well, I of course touched a soldering point in the red area as my hand slipped. I heard and felt a tiny “click” and after replacing the HDD with SSD etc I can not power the iMac up anymore. Not a sign of life :-( I suppose I broke the power supply. Can someone confirm? Or could something else have broken too?

    David Rosner - Réponse

  22. 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.
    • 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 this guide when your repair is complete to replace the adhesive strips that secure the display to the rear enclosure.

    You really should be using film handling or surgical type gloves to handle the screen to minimise finger grease on any of it. Even if it’s possible to clean most of it off, it can be corrosive over time.

    Art Hackett - Réponse

  23. If you are replacing the display panel, you may need to transfer additional components from the old panel to the new one. Compare the back of the old display with the replacement display. Note all cables, sensors, and foam cushioning that are missing from the new display.
    • If you are replacing the display panel, you may need to transfer additional components from the old panel to the new one. Compare the back of the old display with the replacement display. Note all cables, sensors, and foam cushioning that are missing from the new display.

    • If there is a wire or cable underneath adhesive tape, always pull the tape off first.

    • If the cable is glued to the chassis, use a heated iOpener or a hair dryer to soften the adhesive first. You can then slide an opening pick underneath the cable to loosen it. Never pull directly on the delicate connectors.

    • Slide an opening pick underneath the foam cushion pieces to separate them from the display, and gently pull them off. You may need some double sided tape to re-attach them to the new display.

    Be extremely careful removing the LCD Temp Sensor from the rear of the screen. If you pull the wire, you run the risk of severing the metal wire from the connector but not notice it because the surrounding plastic insulation may still be intact. Use a razor blade so “shave off” the sensor under the adhesive. I just had the screen replaced by a local shop and, upon boot, the fan was running full-speed and the Mac’s speed was miserable; Excel took 30 bounces in the Dock to launch rather than the expected 4-5. Novabench showed the Mac running at 4% of its expected speed (overall). The tech examined the sensor carefully, found the broken connection, soldered it back into place, and all was fine. Note that the (partially disconnected) sensor actually showed up when I ran Macs Fan Control in an attempt to work-around this. No problem controlling the fan speed then but the iMac’s running speed was awful until the disconnected sensor wire was fixed.

    barryjaylevine - Réponse

    Hi barryjaylevine,

    I’ve had my LCD replaced on my iMac 27 / 2013 and there is no LCD Temp Sensor cable on the replacement screen.

    I’m experiencing the same performance issues.

    I’ve ordered a new sensor, do you have any pointers as to how to install it?

    Thanks,

    Simon

    UK

    simon kennedy -

    hey Simon, I used 2-sided tape….this is assuming the new sensor doesn’t already come with an adhesive surface already applied.

    a roll of kapton tape for your own peace of mind will make sure nothing detaches from thermally-induced adhesive crystallization

    make sure you position it in such a way that you can easily plug the lead back into the mobo….not a lot of length to that wire

    placebomessiah - Réponse

    Howdy folks,

    Thanks for all the tips, LCD sensor fitted and iMac back in action.

    Never again!

    Simon

    simon kennedy - Réponse

    Hello all. So I’m trying to pinpoint my backlight issue on my 2015 retina 5k - I noticed I’m missing my thermal sensor on the LCD. Would this help with the backlight? I’m sure it will keep my fans from going crazy. Any help would be appreciated! Note: I have LEDs except the 4th one. Thanks!

    Jordan Shababy - Réponse

    • With the hinge free to move, the iMac will be unbalanced and hard to work on. Repairs can be completed with the iMac laying down, but are faster and easier with an iMac service wedge.

    Incomplete guidance . Does not say how to transfer cables such as thermal sensor .

    Yuan - Réponse

    La traduction française est tronquée : “…plus faciles avec une cale de maintien pour iMac”

    (https://eustore.ifixit.com/fr/Outils/Org...)

    Pierre-Aurélien - Réponse

  24. Remove two 10.0 mm T10 screws.
    • Remove two 10.0 mm T10 screws.

    If you just want access to the HD, there is no need to remove any speaker wires - it slides over enough to access the HD screws.

    johann beda - Réponse

  25. Unplug the left speaker cable from its socket on the logic board. Be sure to pull straight up out of the socket. 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.
    • Unplug the left speaker cable from its socket on the logic board. Be sure to pull straight up out of the socket.

    • 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 - Réponse

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

    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 - Réponse

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

    Joseph Ashe - Réponse

    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 - Réponse

  27. Lift the left speaker straight up, until the power button cable is exposed (about 0.5"). Lift the left speaker straight up, until the power button cable is exposed (about 0.5").
    • Lift the left speaker straight up, until the power button cable is exposed (about 0.5").

  28. Gently de-route the power button cable from its groove in the left speaker. Gently de-route the power button cable from its groove in the left speaker. Gently de-route the power button cable from its groove in the left speaker.
    • 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 - Réponse

  29. 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.
    • 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 - Réponse

    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 -

  30. Pull straight up on the SATA data/power cable to disconnect it from the drive. Pull straight up on the SATA data/power cable to disconnect it from the drive.
    • Pull straight up on the SATA data/power cable to disconnect it from the drive.

    Is the WD hard drive an Apple Special with some internal rom or other thing? Planning to put in a Seagate Firecuda 2TB. Is there some special plug or temperature sensor requirement? Seems like there is only the SATA connector. Will I encounter fast fans? (can load the software to stop that). Think it’s a swap and is “easy”.

    Carl Schultz - Réponse

  31. Remove two 7.3 mm T10 screws securing the left hard drive bracket to the rear case.
    • Remove two 7.3 mm T10 screws securing the left hard drive bracket to the rear case.

    If you have the iMac sitting upright, there is a potential risk of dropping the screws into the iMac casing. Be cautious or lay it down flat.

    Robert - Réponse

    Been there done that. Had to flip it and shake the heck out of it to get that srew to fall out!

    webmail54 - Réponse

    Left hard drive bracket screws are T8!! Had to remove HD first before derouting left speaker cable.

    lamajr - Réponse

    Thank you iFixit for sending a T10 with magnetic tip. You saved me!

    Ben Hannam - Réponse

    The bracket screws are T10. The screws on the left side of the SILVER hard drive itself, are T8. If you seem to need a T8, you are actually trying to remove the wrong two screws. Look immediately to the left of the hard drive & you will see the BLACK bracket frame with two screws that use T10.

    jumpoverpuddles - Réponse

  32. Grab the hard drive and left hard drive bracket together. Tilt the left side up away from the rear case, and slide the assembly to the left. Remove the hard drive and left hard drive bracket from the iMac.
    • Grab the hard drive and left hard drive bracket together.

    • Tilt the left side up away from the rear case, and slide the assembly to the left.

    • Remove the hard drive and left hard drive bracket from the iMac.

    Two notes here:  If you are using OWC’s Thermal Sensor HDD Upgrade Cable, be sure to tuck the cable under the hard drive slightly.  You cannot allow the connector to sit near the top edge since this will not allow the monitor to sit flush with the chassis when it is reattached.  Additionally, the SATA connector does not seem to fit together as snuggly as when it was connect to the HDD, so tape or a plastic cable tie to keep the connection tight may be good insurance to prevent it from coming loose.

    If you are planning on dual booting with Windows 10, the Windows 10 installed failed when the SSD and HDD were both connected at the same time.  I had to disconnect the HDD until Windows 10 was installed.  Note: I did a fresh install on a new SSD not configured as a fusion drive.  If you are planning on doing this as well, use packing tape (or something similar) to hold the monitor in place until after installing the OSs.  Then reconnect the HDD and apply the adhesive to the monitor for a permanent seal.  Good Luck!

    Walter Hayden - Réponse

    Hi Walter, i’m looking to replace the broken fusion drive with a SSD, do i have to get the OWC’s Thermal Sensor HDD Upgrade Cable?

    Gregorio Alvarado Sahli -

    Full removal of the speaker is unnecessary - just very carefully unplug the two-conductor power button cable, which is routed through the groove along the edge of the speaker enclosure. Next, unfasten the two large torx screws holding the speaker enclosure to the chassis. Now you can easily scoot the speaker away from the drive mount - move it over just enough to reach the drive mount’s 2 torx fasteners beneath the edge of the speaker (a CM or two). There’s now enough room to easily remove and replace the drive assembly .

    clinton - Réponse

    Just wondering if the HDD 3.5 (3TB) in my 2015 27’ 5K iMac case are the ones with the temp control firmware onboard. Just got quote from Auhorised repair centre for 2x the normal price of a 3TB drive. They say I can drop in one i source myself if I like but I don’t want to get it back and have the fans run all the time. Thanks in advance :)

    Declan Casey - Réponse

  33. Remove the left hard drive bracket. Remove the left hard drive bracket.
    • Remove the left hard drive bracket.

    This step is unnecessary. Just leave the bracket in place and set the assembly aside.

    Anthony Zimmerman - Réponse

  34. 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.
    • 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 - Réponse

    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 - Réponse

    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 - Réponse

  35. Remove the following four screws securing the power supply to the rear case (size T8 or T10 depending on the exact model):
    • 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

    In the iMac I just bought (2016), these were not T10. I believe they are T9. Can anyone confirm?

    Morgan Crossley - Réponse

    Regarding the screws on the power supply board (step 35), I can confirm these are not T10 screws as shown in the guide. In my Late 2015 Retina 5k model, the screws are T8. Morgan mentioned T9 and depending on your T9 driver, it may just barely fit but can easily slip and strip the screw. A T8 driver goes deeper in and holds the screw properly.

    smudge -

    My late 2015 model has these as T8 screws.

    Anthony Zimmerman - Réponse

    Late 2015- T8 as well!! Check out this Powerbook Medic teardown video as a cross reference guide!!

    https://www.youtube.com/watch?v=81PjGv8B...

    lamajr - Réponse

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

  37. Depress the tab on the DC power cable connector, then pull it straight out of its socket on the back of the logic board. Depress the tab on the DC power cable connector, then pull it straight out of its socket on the back of the logic board.
    • 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 - Réponse

    Thank you Manuel, this was a tricky one.

    David Zemsky - Réponse

    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 - Réponse

    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 - Réponse

  38. 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.
    • 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 - Réponse

  39. Remove two 10.0 mm T10 screws.
    • Remove two 10.0 mm T10 screws.

  40. Gently rock the right speaker slightly to the right, to allow access to its cable's connection on the logic board. Gently rock the right speaker slightly to the right, to allow access to its cable's connection on the logic board.
    • Gently rock the right speaker slightly to the right, to allow access to its cable's connection on the logic board.

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

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

    Did this tonight. I couldn’t get the right speaker out. But I was able to move it far enough to the right to be out of the way of the logic board.

    Kenneth Cluff - Réponse

    You have to remove the five small screws on the lower edge of the iMac to remove a strange bracket or something, like the 21.5” 2012->… iMacs

    Federico Barutto -

  43. Use the tip of a spudger to disconnect the fan cable's connector from its socket on the logic board. Use the tip of a spudger to disconnect the fan cable's connector from its socket on the logic board. Use the tip of a spudger to disconnect the fan cable's connector from its socket on the logic board.
    • Use the tip of a spudger to disconnect the fan cable's connector from its socket on the logic board.

  44. 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.
    • 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.

  45. Remove three 12.4 mm T10 screws securing the fan to the rear case.
    • Remove three 12.4 mm T10 screws securing the fan to the rear case.

  46. Remove the fan from the iMac. Remove the fan from the iMac.
    • 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 - Réponse

  47. Use the flat end of a spudger to disconnect each of the four antenna connectors from the AirPort/Bluetooth card. Note the original positions for each connector when reconnecting the cables. From left to right on the card, the antennas are connected in the following order: Leftmost
    • Use the flat end of a spudger to disconnect each of the four antenna connectors from the AirPort/Bluetooth card.

    • Note the original positions for each connector when reconnecting the cables. From left to right on the card, the antennas are connected in the following order:

    • Leftmost

    • Top

    • Upper right

    • Lower right

    My iMac has a slightly different assembly. There are 2 - T5 torx screws holding little clamps for each cable (2 clamps per screw). Certainly more secure but another size screw to deal with…

    Greg Freeman - Réponse

    My iMac also same with Greg mentioned. need to T5 torx driver. A1419. Late 2015, Korean Version.

    Joseph Yang - Réponse

    My 2017 has long WI-Fi card, It’s It’s a M.2, cuz no remove antenna. Undo WI-Fi card fix screws and pull out card. Easy one.

    Tanya Chachanova - Réponse

    Before I disconnect the cables, I use different color sharpies and draw a different color on each one’s head & then I take a picture of the cables connected to the board. Pic is my reference of which cable goes to what connector.

    lamajr - Réponse

  48. This is a delicate connection that can be easily broken. Flip up the metal retaining bracket on the iSight camera cable. Pull the camera cable connector straight out of its socket, toward the top of the iMac.
    • This is a delicate connection that can be easily broken.

    • Flip up the metal retaining bracket on the iSight camera cable.

    • Pull the camera cable connector straight out of its socket, toward the top of the iMac.

    During disassembly, I taped the cable up and out of the way, as it tends to get in front of things.

    Tony Ross - Réponse

  49. Use the flat 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. Gently push the cable out of the way.
    • Use the flat 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.

    On my 2017 iMac there is a tiny little cable and connector on the motherboard that is approximately half way along the motherboard and is connected down towards the base of the case. It came free easily when I removed my motherboard but just wanted to remind people to reconnect!

    Stuart Swaffer - Réponse

  50. Remove the following screws from the front of the logic board: Two 23.7 mm T10 screws
    • Remove the following screws from the front of the logic board:

    • Two 23.7 mm T10 screws

    • Four 7.4 mm T10 screws

    • One 20.8 mm T25 spacer screw

    • One captive T10 screw

    • This screw is beneath a hole in the logic board. You'll need a fixed screwdriver or the 60 mm extension from an iFixit driver kit to reach it.

    The central screw is very difficult to reach! Use a long and very thin T10 screw driver

    MrSchaeffer - Réponse

    On my late 2015 there is another T10 (approx 16 mm long) on the lower edge slightly left of the hole in the logic board giving a total of 4 screws along the bottom edge.

    Konrad Skeri Ekblad - Réponse

    I’ve also found an extra T10 in my late 2015 iMac

    luis - Réponse

    My 2017 has small flat cable and connector on logic board. And all screws are changed to T 9

    Tanya Chachanova - Réponse

    Note: the T25 spacer is behind and to the left of the logic board and below the HDD bracket.

    Tom - Réponse

  51. The hard drive SATA cable can't be removed just yet, but will get in the way of removing the logic board. Pull the cable and connector through the right hard drive bracket. Move the cable to the right side of the iMac, out of the way of the exhaust port. Pull the cable and connector through the right hard drive bracket. Move the cable to the right side of the iMac, out of the way of the exhaust port.
    • The hard drive SATA cable can't be removed just yet, but will get in the way of removing the logic board.

    • Pull the cable and connector through the right hard drive bracket. Move the cable to the right side of the iMac, out of the way of the exhaust port.

    Anyone know if models that shipped with only a bladed SSD have the SATA cable still inside? I’m guessing probably not, but haven’t been able to confirm anywhere.

    Jesse Mitchell - Réponse

    The cable was so stiff, I didn’t try to pull it through the bracket. Instead I removed the upper screw holding the right HDD bracket in place. Then I rotated it counter clockwise enough to just move the cable behind it and out of the way. Once I did that, I screwed the bracket back into place. I reversed the process when I put the machine back together. It’s a Torx-10 BTW.

    Kenneth Cluff - Réponse

    Excellent tip, Kenneth! I did the same, made things easier.

    Dave Hoppenrath - Réponse

  52. Remove two 5.7 mm T10 screws from the top of the heat sink exhaust duct.
    • Remove two 5.7 mm T10 screws from the top of the heat sink exhaust duct.

    My model (2015) had another screw holding the heatsink duct and a stand-off holding the whole thing attached to the back. Even gently moving the logic board almost got the duct damaged till I realised what was going on so I’d suggest to be careful and DO NOT pull the logic board if it looks like it’s still attached - most likely it is!

    Carlos Ferrari - Réponse

  53. Tilt the logic board slightly forward. Lift the logic board straight up and out of the iMac. Be careful not to snag on any of the screw posts attached to the inside of the rear case. Lift the logic board straight up and out of the iMac. Be careful not to snag on any of the screw posts attached to the inside of the rear case.
    • Tilt the logic board slightly forward.

    • Lift the logic board straight up and out of the iMac. Be careful not to snag on any of the screw posts attached to the inside of the rear case.

    You should add a step about removing the sata cable here. When following the directions in reverse I forgot to put in back on and had to remove the motherboard again.

    Ken Prows - Réponse

  54. 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.
    • 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.

    To help me line up the IO ports, I filled all the USB ports on the back with thumb drives before I screwed the Logic board back down. Worked like a charm!

    Alex Grayson - Réponse

  55. Remove the four 7.5 mm T8 screws from behind the GPU on the logic board. These screws are set inside large, spring-loaded Phillips #2 screws. To prevent the larger screws from spinning when you loosen the T8 screws, hold them with a fingertip or Phillips #2 screwdriver. These screws are set inside large, spring-loaded Phillips #2 screws. To prevent the larger screws from spinning when you loosen the T8 screws, hold them with a fingertip or Phillips #2 screwdriver.
    • Remove the four 7.5 mm T8 screws from behind the GPU on the logic board.

    • These screws are set inside large, spring-loaded Phillips #2 screws. To prevent the larger screws from spinning when you loosen the T8 screws, hold them with a fingertip or Phillips #2 screwdriver.

  56. Remove the bracket from behind the GPU heat sink.
    • Remove the bracket from behind the GPU heat sink.

  57. Remove four black stickers from the back of the CPU heat sink.
    • Remove four black stickers from the back of the CPU heat sink.

  58. Remove four 12.3 mm T10 screws from the back of the CPU heat sink.
    • Remove four 12.3 mm T10 screws from the back of the CPU heat sink.

  59. Remove the spring plate from behind the CPU heat sink. Lift and remove the backing plate from behind the CPU heat sink. The backing plate has two posts that fit into alignment holes in the logic board. Lift and remove the backing plate from behind the CPU heat sink. The backing plate has two posts that fit into alignment holes in the logic board.
    • Remove the spring plate from behind the CPU heat sink.

    • Lift and remove the backing plate from behind the CPU heat sink. The backing plate has two posts that fit into alignment holes in the logic board.

  60. Lift the heat sink up from the logic board. The CPU will most likely stick to the heat sink, so be careful about where you put it down. The CPU will most likely stick to the heat sink, so be careful about where you put it down.
    • Lift the heat sink up from the logic board.

    • The CPU will most likely stick to the heat sink, so be careful about where you put it down.

  61. The CPU will most likely be stuck to the heat sink with thermal compound. Insert the flat end of a spudger between the CPU and heat sink. Gently pry the CPU up by slightly twisting the spudger.
    • The CPU will most likely be stuck to the heat sink with thermal compound.

    • Insert the flat end of a spudger between the CPU and heat sink.

    • Gently pry the CPU up by slightly twisting the spudger.

    • Remove the CPU from the heat sink. Be careful not to touch the contacts.

    • To reinstall the heat sink, see our thermal paste guide for instructions on cleaning and preparing the thermal surfaces and applying a new layer of thermal compound onto the CPU and GPU dies.

    • For the VRAM chips surrounding the GPU, install thermal pads or a thick thermal paste such as K5-PRO, rather than regular thermal paste.

    • Install your CPU into its socket on the board, not on the heat sink. Check the orientation and make sure it lines up correctly in the socket. Follow the instructions specific to your CPU type to apply fresh thermal paste to the surface of your CPU. Then, reinstall the heat sink over the top.

    If like me you’re upgrading the CPU - or maybe just reapplying thermal paste - you’re in for a treat when you try to reinstall the heatsink…

    That spring is very strong and you’ll have to flip the board to put it back. BUT that might shift the CPU out of place and when you do apply force to secure the spring you might bent or break the CPU depending on how much it shifted.

    Mine got bent (took me hours to troubleshoot) and I was lucky to unbent with no damage.

    What I recommend is to secure the GPU screws first - go all the way! - and then proceed with the CPU. Still be very careful and if it doesn’t feel right just stop take everything apart and do over. Better safe than throw hundreds of dollars worth of CPU in the trash…

    Carlos Ferrari - Réponse

    Hey Carlos! Even though you warned me before I got to this step I still managed to mess it up! CPU shifted, corner wasn't in the socket properly so when I tightened heatsink it bent corner of CPU and looks like it moved some pins a little. So I suppose I need to try to bend back CPU and pins - otherwise I need to back replacements… or give up..

    William Pinnell - Réponse

    How tight should the CPU heatsink screws be? Do you screw them down all the way down to the board, or should there be a gap between the back plate and the mobo? I wish I took a pic of the back of the heatsink before taking it off!

    Ken Prows - Réponse

    @xev All the way to the board, or until they suddenly stop turning. No need to take photos—we provide all these high resolution images so you don’t have to do that. Click any image to blow it up. Here’s one showing the heat sink screws in their original installed position.

    Jeff Suovanen -

Conclusion

To reassemble your device, follow these instructions in reverse and use our adhesive strip replacement guide to reattach the display glass.

Une autre personne a terminé cette réparation.

Sam Goldheart

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Hi All,

did you notice something unusual in the contact surfaces between GPU and Heatsink ?

Some unit are hotter than others, we are discussing in a forum if it may be a problem with the cooling system. My 5K with the M295X can top at 100°C and others even 108° with consistent louder fan (+400rpms for the same task).

Massimiliano Parisotto - Réponse

Can you tell me if the high temps, 106 Celsius, in the iMac retina GPU should be a big concern or not? I am considering returning my iMac in the next few days because of this.

Anthony Barone -

I would highly recommend using at the very least, an anti-static wrist band when attempting any computer repair to this level.

In the 1980's I ran Commodore UK's service department. At that time we suffered a 30% failure rate of PC's that were being configured and assembled in our factory. The failures ceased the moment anti-static precaution were introduced!

jerrypank - Réponse

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