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

Introduction

Removing smoke, shadow, dust behing the LCD panel of 20, 21.5, 24 and 27-inch non-unibody aluminium iMac.

Image 1/1:

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Image 1/1: Remove 4 screws from the left bracket then 4 screws from the right bracket as displayed (the smallest is at the bottom) ;
  • Face the LCD down (be sure to have nothing between the screen and the table) ;

  • 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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Image 1/3: Use a "Post-It" to keep the adhesive from the frame ; Image 2/3: Continue gently between the bracket and the frame ; Image 3/3: Continue gently between the bracket and the frame ;
  • Use a "Putty Knife" to separate brackets from the LCD panel frame as shown ;

  • Use a "Post-It" to keep the adhesive from the frame ;

  • Continue gently between the bracket and the frame ;

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Image 1/2: 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 : Image 2/2: Bottom left, center, right ;
  • Using the "Putty Knife" make a groove in the shield around the whole frame ;

  • 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 :

    • Bottom left, center, right ;

    • Left bottom, top ;

    • Right bottom, top ;

  • Lift the frame 90° maximum ;

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Image 1/3: Meticulously clean the inside. Do not use any detergent at most a very lightly humidified microfiber / lint-free cloth ; Image 2/3: 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 ; Image 3/3: Reassembly is going back those steps making sure to get rid of your finger-prints ;
  • 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);

  • Meticulously clean the inside. Do not use any detergent at most a very lightly humidified microfiber / lint-free cloth ;

  • 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 ;

  • Reassembly is going back those steps making sure to get rid of your finger-prints ;

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Conclusion

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

15 other people completed this guide.

LLange

Member since: 11/25/2013

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2 Guides authored

14 Comments

Thank you for this guide! Helped me very much. And now my iMac is clean again :)

Robert - Reply

I got the screen cleaned and all was well but when I returned everything back to the iMac the lower part of my screen didn't work...

Chris Malka - Reply

If the backligt is ok but no image check connections :

— To the logic board ;

— Then underneath the protective cover on the top of step 2 image…

If the backlight is not ok check the connector and the cable at the lower right corner of step 2 image.

Beware that if you have bended the LCD you might have damaged it.

LLange -

It sounds like the LCD got bent then because the connections are fine so I just ordered a new LCD. But the guide was definitely helpful, I got the dust out!

Chris Malka -

Sorry about this I'm adding a warning on Step 5 to lift gently and no more than 90° hoping this might prevent others to have the same issue.

P.S. the LCD has an electronic board some times people have flickering issues after the display warmed-up. Thus changing that "inner-board" might solve their issue ⇒ after you receive your new LCD, try to sell the old display "inner-board" as well as the connectors…

LLange -

Thank you! Great guide! My LCD panel is now clean again ! i made it in 1h30.

srunde - Reply

I bought a late 2009 iMac off of craigslist four days ago for a CRAZY price, the reason he sold it to me so low was because over half the screen was covered in a grey cloud that only showed up when it was on a white screen. After following this operation I now have a perfectly fine iMac for $250. Come up! Thank you guys! I ran into little to no difficulties, except the first time I did it I trapped a single hair in there that I knew would just drive me insane but after the second time it's now perfect.

Max - Reply

The 21.5" LG lcd panel only has side brackets. In this example with the 27 LG led there are corner brackets.

When disassembling the panel for the 21.5" are there only these side brackets and then cutting off the covering tape? Also seems on the 21.5 lcd it has a lot of clear tape and electrical tape on top. Does this get completely removed?

Rajan - Reply

The side brackets on the 21" version do not need to be removed. The brackets help to assist the repair as a lever to pry the frame apart. The prying should be done with a spider not a putty knife as one slip and you can cause more damage.

Also in the 21 version be careful of the tabs on the side. Those are not convenience tabs but part of the lcd panel.

Rajan - Reply

All perfect but mine (2010, 27") has dust under the backlight diffuser too. Is it possible to disassemble the panel and clean this? Its moving around a 1-2mm underneath the black plastic frame, looks like a thin plastic panel. Thank you in advance.

manosr35 - Reply

Late answer but might still be usefull for others : I don't know except the LCP panel is fragile thus I'd consider trying with 4 hands and a air compressor (no bottles/cans as the gas my leave traces). Step 0 on every fix should be "work in a as clean as possible evironement".

Try some how to have the room you're working in as if it was a clean room (wet dishtowels are a pretty good seal and dust filter). You want to dettach dust particles from the assembly and have them fly far away from it without new one sticking back. You may also try to use "3M Hand-Masker Dirt Catcher Super Sticky Mat" (available on Amazon if not on iFixit) in the air-stream, surely dust particles will fancy it better than the LCD assembly.

LLange -

Tread very, very carefully with that LCD panel.

Kevin McCartney - Reply

yes, thank's is good

driss abdouh - Reply

Does this procedure work with late 2012 iMac? Thanks!

pdegiuda - Reply

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