Introduction

Replace a broken or noisy fan in your iMac.

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.

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.

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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.

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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.

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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.

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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.

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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.

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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

Black Friday
Broken doesn't stand a chance.
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".

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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  • 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

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.

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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 join 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 join to free the fan.

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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.

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Remove the fan from the iMac. Remove the fan from the iMac.
  • Remove the fan from the iMac.

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Conclusion

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

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