Apple imac 20 inch early 2008 User Manual

							iMac (20-inch Early 2008)  Take Apart — Glass Panel 31
Metal Alignment Pins on the Glass Panel
There are alignment pins at the top of the glass panel near the camera, one pin at the bottom 
near the IR remote sensor, and a pin on the left and right side of the glass.  Important: If the glass 
is removed from the bezel at an angle, the metal alignment pins may bend, causing scratches on 
the inside of the glass and possibly requiring replacement of the glass panel.
Magnets on the Front Bezel
The glass panel has a thin silver ferrous metal band affixed to the perimeter which is magnetically 
attracted to the fourteen magnets (circled below) which are attached to the front bezel. These 
magnets hold the glass panel in place. Suction cups are used to pull the glass panel away from 
the magnets on the front bezel. .
  
						

							iMac (20-inch Early 2008)  Take Apart — Glass Panel 32
Removing the Glass Panel
Apple 1. strongly recommends wearing clean lint-free gloves whenever handling the glass 
panel. The gloves protect the glass panel from body oils, dirt, and other contaminants. Put on 
a pair of clean gloves with the rubberized-side of the gloves on the palm side of your hand.
Position the computer on the rear cover, on a soft protective lint-free surface, with the stand 2.  
facing you
Clean off the suction cups, making sure they are free of contaminants. It may be necessary to 
3. 
wash the suction cups with a mild liquid soap in order to remove the residual release agents 
applied during manufacturing. 
						

							iMac (20-inch Early 2008)  Take Apart — Glass Panel 33
4. Gently press the suction cups in opposite corners on the glass panel, as shown.  Important: 
Make sure the suction cups are firmly attached to the glass before lifting the glass. 
Hold onto the suction cups and gently lift the glass panel 
5. straight	up	and	off 	the	bezel. 
						

							iMac (20-inch Early 2008)  Take Apart — Glass Panel 34
Set the glass down on the microfoam bag or clean lint-free surface and remove the suction 
6.
 
cups. Squeeze the base of each suction cup to release them from the glass panel.
Touching only the edges of the glass, slide the glass panel into the microfoam static-free 
7. 
bag. Set the glass aside in a location where it won’t get damaged. The bag will help minimize 
contamination of the glass. 
						

							iMac (20-inch Early 2008)  Take Apart — Glass Panel 35
Replacing the Glass Panel
Put on a pair of clean gloves with the rubberized-side of the gloves on the palm side of your 1. 
hand.
Install the LCD display panel onto the computer if it was removed.2.  
Replace the font bezel if it was removed, connect the microphone cable and replace the 3. 
bezel screws.
Locate the sticky silicone roller and the dust removal pad. Remove the protective covering 
4. 
on the silicone roller and peel the protective cover off the dust removal pad. 
						

							iMac (20-inch Early 2008)  Take Apart — Glass Panel 36
Holding the sticky paper with your free hand, clean the silicone roller on the sticky paper 
5. 
by rolling the roller back and forth once or twice on the sticky paper. If the sticky paper has 
been used multiple times and looks dirty, use a new piece of sticky paper. 
Note: Wash the 
silicone roller in warm soapy water if the roller is no longer tacky. Replace the silicone roller if 
the tackiness does not return.
Set the roller aside on its clean protective roller cover while you prepare the glass and 6.  
computer. 
						

							iMac (20-inch Early 2008)  Take Apart — Glass Panel 37
REMINDER:  WEAR CLEAN GLOVES AND ONLY HANDLE THE GLASS BY THE EDGES.
7.
 
Stand the computer upright. 8.  Note: Less dust particles will settle on the LCD panel with the 
computer in the vertical position.
Roll the sticky silicone roller over the LCD panel to remove any particles. 
9. Note: A larger 
silicone roller was used for demonstration purposes, however; the 6-inch silicone roller from 
Apple service will suffice.
Remove the glass panel from the microfoam bag. Place the glass on the bag with the inside 10.  
surface of the glass (side with metal pins) facing up.  
						

							iMac (20-inch Early 2008)  Take Apart — Glass Panel 38
Clean the 11 . INSIDE of the glass panel with the clean silicone roller to remove dust or other 
loose particles. Gently roll the clean silicone roller over the inside of the glass.  Note: If 
fingerprints	and	oils	are	on	the	inside	of	the	glass, 	clean	the	inside	first	with isopropyl 
alcohol or use the LENSPEN LapTop PR O. 
Holding the glass by the edges, carefully line up the metal pins on the inside of the glass 12.  
panel with the holes at the top of the front bezel and the hole at the bottom of the bezel. 
Gently lower the glass panel onto the bezel. The magnets on the front bezel will pull panel 
and hold the glass panel in place.   
						

							iMac (20-inch Early 2008)  Take Apart — Glass Panel 39
Clean the outside of the glass panel with a clean microfiber cleaning cloth.  If necessary, 13 . 
spray a small amount (two pumps) of iKlear polish on the outside of the glass panel. Wipe 
the glass until the solution completely disappears and there is no longer any residue or 
haze. CAUTION: Do not use single wipe iKlear packets or other cleaning solutions to clean 
the glass. The LENSPEN LapTop PR O is also a very effective tool to use for smudges or 
fingerprints on the outside of the glass panel.
Once the glass has been cleaned and polished, visually inspect the glass for any remaining 14.  
dust, fingerprints, or a hazy residue. If there are contaminates trapped between the LCD 
panel and the glass panel repeat the cleaning procedure described in this section before 
returning the system to the customer.
Replace the memory access door.
15 .  
						

							iMac (20-inch Early 2008)  Take Apart — Glass Panel 40
Installing a Replacement Glass Panel
Stand the computer upright. 1. Note: Fewer dust particles will settle on the LCD panel with the 
computer in the vertical position.
Roll the sticky silicone roller over the LCD panel to remove any particles. 
2.  
Remove the new glass panel from the service packaging. 3. Note: The new panels have a 
removable film protecting the glass on both sides. 
Place the glass on a clean microfoam bag with the inside of the glass facing up (the side 
4.  
with metal pins.) Wearing gloves, carefully remove the protective film from the inside surface 
of the glass.