Introduction
Removing smoke, shadow, dust behing the LCD panel of 20, 21.5, 24 and 27-inch non-unibody aluminium iMac.
What you need
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Face the LCD down (be sure to have nothing between the screen and the table) ;
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Remove 4 screws from the left bracket then 4 screws from the right bracket as displayed (the smallest is at the bottom) ;
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Use a "Putty Knife" to separate brackets from the LCD panel frame as shown ;
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Use a "Post-It" to keep the adhesive from the frame ;
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Continue gently between the bracket and the frame ;
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Using the "Putty Knife" make a groove in the shield around the whole frame ;
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Once done from the bottom center to the edges of the LCD panel unclip the frame (don't touch the top). Clips are located at :
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Bottom left, center, right ;
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Left bottom, top ;
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Right bottom, top ;
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Lift the frame 90° maximum ;
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Using gloves and a suction cup gently lift the LCD sheet (no more than 90° failing to do so may bend the LCD and cause image displaying issues);
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Meticulously clean the inside. Do not use any detergent at most a very lightly humidified microfiber / lint-free cloth ;
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Do not use an air spray as those might leave marks. Best to get rid of dust is a simple hair dryer going from the top center to the edges ;
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Reassembly is going back those steps making sure to get rid of your finger-prints ;
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