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This is a step by step walkthrough showing you how to remove the current focusing screen and replace it with another, in order to restore auto focus or implement a different focusing screen for manual focusing.

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crwdns2931653:01crwdne2931653:0 Power down the camera and remove battery

Canon EOS Rebel T2i Focusing Screen Replacement, Power down the camera and remove battery: crwdns2935265:01crwdnd2935265:01crwdnd2935265:02crwdne2935265:0

Canon EOS Rebel T2i Focusing Screen Replacement, Power down the camera and remove battery: crwdns2935265:01crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

Turn the camera off using the power switch on the top of the camera.
Open the battery compartment on the bottom of the camera and remove the battery. Then close the battery compartment.

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crwdns2931653:02crwdne2931653:0 Removing the lens

Canon EOS Rebel T2i Focusing Screen Replacement, Removing the lens: crwdns2935265:02crwdnd2935265:01crwdnd2935265:03crwdne2935265:0

Canon EOS Rebel T2i Focusing Screen Replacement, Removing the lens: crwdns2935265:02crwdnd2935265:02crwdnd2935265:03crwdne2935265:0

Canon EOS Rebel T2i Focusing Screen Replacement, Removing the lens: crwdns2935265:02crwdnd2935265:03crwdnd2935265:03crwdne2935265:0

While holding both the camera's body and lens securely, press and hold the lens release button located below the marking plate.
Rotate the lens counter-clockwise until it stops turning, and gently pull the lens away from the body.
Place the lens some place safe. It will not be used in this guide.
Secure a rear lens cover onto the lens to protect it from dirt and debris while it is not mounted onto the camera's body.

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crwdns2931653:03crwdne2931653:0 Removing the focusing screen

Canon EOS Rebel T2i Focusing Screen Replacement, Removing the focusing screen: crwdns2935265:03crwdnd2935265:01crwdnd2935265:03crwdne2935265:0

Canon EOS Rebel T2i Focusing Screen Replacement, Removing the focusing screen: crwdns2935265:03crwdnd2935265:02crwdnd2935265:03crwdne2935265:0

Canon EOS Rebel T2i Focusing Screen Replacement, Removing the focusing screen: crwdns2935265:03crwdnd2935265:03crwdnd2935265:03crwdne2935265:0

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Tweezers

$4.99

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Note: In the photos, the focusing screen has already been removed.
The focusing screen is located inside of the body, at the top of the opening, directly above the mirror, inside of a metal housing.
Be careful not to touch the mirror.
To remove the focusing screen, first use tweezers and grab onto the latch that secures the housing above the mirror.
Then gently pull down on the latch, towards the mirror, to release the housing which contains the focusing screen.
Using tweezers, gently but firmly grab the focusing screen by the outer tab, and lift it out of its housing and the camera's body.

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crwdns2931653:04crwdne2931653:0 Installing repacement focusing screen

Canon EOS Rebel T2i Focusing Screen Replacement, Installing repacement focusing screen: crwdns2935265:04crwdnd2935265:01crwdnd2935265:03crwdne2935265:0

Canon EOS Rebel T2i Focusing Screen Replacement, Installing repacement focusing screen: crwdns2935265:04crwdnd2935265:02crwdnd2935265:03crwdne2935265:0

Canon EOS Rebel T2i Focusing Screen Replacement, Installing repacement focusing screen: crwdns2935265:04crwdnd2935265:03crwdnd2935265:03crwdne2935265:0

Do not touch the face of the new focusing screen, and hold the focusing screen by the outer tabs only.
To install the new focusing screen hold it by the outer tab with tweezers, and lower it into the housing, opposing-end of the focusing screen first. Then gently set the tab-end into the housing.
Now grab the latch of the housing with your tweezers and raise the housing up into its original position, above the mirror, applying gentle pressure until it clips into place.
Finally, re-attach the lens, insert the battery, turn the camera on and test the focusing ability of the camera.