Danger
Potentially Dangerous
Injury may result if this procedure is not followed properly. Use caution and follow all warnings.
Danger

Introduction

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.

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" 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" 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" 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 - Reply

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 - Reply

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.

Add Comment

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.

Add Comment

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.

Add Comment

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.

Add Comment

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.

Add Comment

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.

Add Comment

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", 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 - Reply

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 - Reply

Gently twist the plastic card to open the space between the display and frame. Move slowly and be careful not to stress the display glass too much—you only need to make a gap of about 1/4".
  • Gently twist the plastic card to open the space between the display and frame.

  • Move slowly and be careful not to stress the display glass too much—you only need to make a gap of about 1/4".

Add Comment

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.

Add Comment

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.

Add Comment

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.

Add Comment

Black Friday
Broken doesn't stand a chance.
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.

Add Comment

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.

Add Comment

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.

Add Comment

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.

Add Comment

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 - Reply

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.

where can i purchase the power and data cable from?

wei - Reply

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 - Reply

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

redfoxydarrest - Reply

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 - Reply

I agree! +1

Jim Reitz -

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.

There are two strips left and right along the bottom, and where they reach the outer edges the last 20mm has no adhesive, effectively making right-angled lift-tabs, so you can remove these strips completely by carefully pulling them off from the outer ends.

Stef - Reply

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 - Reply

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

David Zemsky - Reply

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 - Reply

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 - Reply

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 - Reply

Be very careful handling the display—it's big, heavy, and made of glass. Lift the display up from the frame and remove it from the iMac. It may be necessary to slowly lift from one side, to peel against the remaining adhesive.
  • Be very careful handling the display—it's big, heavy, and made of glass.

  • Lift the display up from the frame and remove it from the iMac.

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

Add Comment

  • 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.

ONLY FOR EXPERIENCED MASTERS WITH NON-HUGE (big fat) FINGERS.

On a 27" Retina, I skipped to step 34 and did not remove the speaker nor the Hard Drive. When the instructions instruct removing the left HD Rail, you know it's wasting your time. Go to the power supply and unscrew the 4 T10 screws. *Not in the guide, un-attach the small connector in top left corner, then gently lift and twist the board out. **Next unplug the small plug behind it, in the bottom right corner by pressing the release on it. Lastly dis-connect the large plug which does NOT slip right out until you depress the snap-clamp holding it on the back side.

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 - Reply

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

Add Comment

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.

Add Comment

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 - Reply

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 - Reply

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

Joseph Ashe - Reply

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").

Add Comment

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.

Add Comment

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 - Reply

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 -

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.

Add Comment

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 - Reply

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

webmail54 - Reply

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.

Add Comment

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

Add Comment

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 - Reply

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 - Reply

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 - Reply

Remove the following four screws securing the power supply to the rear case:
  • Remove the following four screws securing the power supply to the rear case:

    • Two 23.7 mm T10 screws.

    • Two 7.3 mm T10 screws.

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

Morgan Crossley - Reply

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 -

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.

Add Comment

Pull the DC power cable straight out of its socket on the back of the logic board. Pull the DC power cable straight out of its socket on the back of the logic board.
  • Pull the DC power cable 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 - Reply

Thank you Manuel, this was a tricky one.

David Zemsky - Reply

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 - Reply

Conclusion

To reassemble your device, follow these instructions in reverse and use our Adhesive Strips Guide to reattach the display glass.

11 other people completed this guide.

Andrew Optimus Goldberg

Member since: 10/17/2009

341,141 Reputation

1,030 Guides authored

Team

iFixit Member of iFixit

Community

127 Members

6,703 Guides authored

6 Comments

Hi, great in instructions.. I've had the power supply out for inspection...all looks good. I have NO LED's at all, Is there a way to test the power supply..?

richarddeath - Reply

Hi, great instructions thx, I've had the power supply out for inspection all LOOKS good, I have NO LED's at all, is there a way to test the PSU before I order one ans also how would I test the on / off switch just in case.? thx for ANY help

richarddeath - Reply

Why isn't there a power supply replacement part for this repair? Need a PSU for this exact machine. Is it because they used the same PSU for a few different years?

KramekWhalenSystems - Reply

Hey Kramek did you find your power supply, I'm looking for the exact same part? Any ideas where I can find one?

victor francis -

This just ended my love affair with Apple. This is the second PSU fault on 2 machines over a 5 year period and in both cases, the machines have (or, in this case, will have to) return to Apple for repair. I'm thankful that Linux has finally reached the point where I can use it daily without having to worry too much. I have a fairly heavy investment in Apple software but that's just going to have to wait until the company makes user-serviceable machines again... right now, Hackintosh looks the way to go for that. I can't abide having a machine that I can't reasonably service with commonly available parts.

Marc Draco - Reply

Better not hold your breath on that.

Danielle Berges -

Add Comment

View Statistics:

Past 24 Hours: 16

Past 7 Days: 146

Past 30 Days: 636

All Time: 14,559