Introduction
The tapered edge iMac (2012-2020) removed the magnetic screen attachment system that was used in the earlier iMac models (2007-2012).
To gain access to modify or replace internal components we have had to use special "tape kits" that replicate the size and shape of the original tape used by Apple during manufacturing. They are relatively expensive to purchase because of their specialized nature. They are also fairly difficult to attach, requiring cleaning the surface of old tape.
For people who like to have easy access to their iMac for repair, without having to buy tape kits, I have found a method that works well using ¾″ neodymium magnets.
You can use any of the many guides on iFixit that explain how to remove the screen - which would be step 1.
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The top of the display has a metal bracket that is magnetic.This is where we can attach our magnet. Make sure the position doesn't interfere with closing the screen into the case.The safest method is to use magnets that have 3M tape pads.
Ask FixBot
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Metal bracket with 20mm neodymium magnet attached without adhesive. It attaches strongly.
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With two magnets attached to the interior display bracket on both sides of the display you can carefully swing the display closed and place another 20mm neodymium magnet on the back of the case. It will find the strongest position on its own. You are welcome to mark this position with a pencil and permanently attach the magnet there or leave as is.
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To secure the bottom of the screen you can use a long strip of black tape or leave as is. You could also make a hinge of tape and mount it internally. You could also use a strip of 3M VHB tape
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Done.
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4 Guide Comments
Yeah cool! Please, do you have further details of the magnet dimensions?
@Alfred: Do a web search and pick a store close to you.
@Daniele Fior @Alfred: When it comes to size, the width of the magnetic bracket is slightly less than the width of the display, so only the height of the bracket (apperoximately 2 cm, i.e., under an inch) will restrict the size of the magnets you buy and attach. I used four (4) circular magnets 1 cm in diameter with a reported holding strength on 0.9kg (YMMV) .
In my case one magnet on each side was enough to hold the Display in place when tilting it. I used four inside/outside (eight in total).
Also try flipping the outer magnets and you will notice that one position gives a stronger attachment.
If you find rectangular magnets the length could be anything (shorter than the display) and their height less than 2 cm, the width of the bracket inside. The outer magnets should ideally match the shape and size of the inner ones.
