Apple imac 20 inch early 2008 User Manual

							iMac (20-inch Early 2008)  Take Apart — Hard Drive Sensor Cable 131
Removing the Hard Drive Sensor Cable 
Disconnect the temperature sensor cable from its connector on the top of the logic board.1. 
Remove the sensor-end of the cable from the sensor clip located under the foam gasket on 2.  
top of the hard drive 
						

							iMac (20-inch Early 2008)  Take Apart — Hard Drive Sensor Cable 13 2
Replacing the Hard Drive Sensor Cable
Connect the sensor cable to the clip on the hard drive and to the connector on the logic 1. 
board.  Place the foam gasket over the sensor clip.
Replace the display panel2.  .
Replace the front bezel.
3. 
Clean and replace the glass panel4.  . Note: This step is very important. Follow the procedures 
to ensure the glass is clean and free of particles.
Replace the access door
5. . 
						

							iMac (20-inch Early 2008)  Take Apart — Optical Drive 13 3
Optical Drive
Tools
Torx T10 screwdriver• 
Torx T6 screwdriver• 
Preliminary Steps
Before you begin, remove the following:
A
• ccess door
Glass Pane
• l
F
• ront bezel
LCD display pane
• l
Part Location 
						

							iMac (20-inch Early 2008)  Take Apart — Optical Drive 134
Removing the Optical Drive
Warning: When servicing the optical drive, handle it by the edges only. Pressing elsewhere on the 
drive could damage its internal mechanism.
Remove the two T10 screws. 
1. 
2.  Carefully peel back the strip of EMI mesh tape that anchors the bezel end of the drive to the 
rear cover.  
 
3. Tilt up the optical drive, remove the two T6 screws on the flex cable board. Remove the flex 
cable board from the end of the optical drive.  
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							iMac (20-inch Early 2008)  Take Apart — Optical Drive 13 5
Disconnect the temperature sensor cable from its connector on the top edge of the logic 
4.
 
board. On the bottom of the optical drive, peel back the foam gasket (not shown) and 
disconnect the sensor from the sensor clip. 
If you are replacing the optical drive, transfer the EMI mesh tape, the foam gasket, and the 5. 
temp sensor cable to the replacement drive. The replacement drive includes the plastic 
mounting brackets, sensor cable clip, slot-load bezel, and the EMI gasket. 
						

							iMac (20-inch Early 2008)  Take Apart — Optical Drive 13 6
Replacing the Optical Drive
Caution: Never press down on or grasp the body of the optical drive when installing it. Pressing 
or squeezing the body of the optical drive could damage the drive mechanism. 
1. Connect the optical sensor cable to the underside of the drive. Place a new foam gasket on 
top of the sensor clip.  Note: Replace the foam gasket when installing a replacement optical 
drive. A new foam gasket is included with replacement optical and hard drives.
2.  Install the flex cable onto the optical drive with two T6 screws. 
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							iMac (20-inch Early 2008)  Take Apart — Optical Drive 13 7
Insert the optical drive bezel into the rear housing, lining up the bezel with the slot opening.3. 
4. Replace the two T10 optical drive screws.
Replace the EMI mesh tape on top of the optical drive. 5. Important: Make sure the EMI mesh 
tape does not cover any of the slot-load opening on the rear cover as you replace the optical 
drive into the computer assembly.
6.  Replace the display panel.  Important: Tuck the four inverter cables into the open cavities 
in the rear housing. If the cables are not tucked into the open areas next to the optical drive, 
the LCD panel will not lower into place correctly making proper installation of the front bezel 
difficult.  
After replacing the optical drive, plug in the computer and test the optical drive by inserting 
7. 
and ejecting DVD-R media. Repeat the insert/eject test three times. 
Replace the front bezel.
8.  
Clean and replace the glass panel9. . Note: This step is very important. Follow the procedures 
to ensure the glass is clean and free of particles.
Replace the access door
10.  .
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							iMac (20-inch Early 2008)  Take Apart — Optical Drive Flex Cable 13 8
Optical Drive Flex Cable
Tools
A black stick• 
Preliminary Steps
Before you begin, remove the following:
A
• ccess door
Glass Pane
• l
F
• ront bezel
LCD display pane
• l
Optical driv
• e
Logic boar
• d
Opti
• cal Fan
Part Location 
						

							iMac (20-inch Early 2008)  Take Apart — Optical Drive Flex Cable 13 9
Removing the Optical Flex Cable
Release the black tape holding the cable to the chassis. Lift the cable out of the chassis.1.  
						

							iMac (20-inch Early 2008)  Take Apart — Optical Drive Flex Cable 140
Replacing the Optical Flex Cable
Position the cable into the rear housing as shown above.1. 
Fasten the flexible cable to the chassis with a piece of kapton tape if the black tape doesn’t 2.  
stick.
3. Replace the optical fan.
4. Replace the logic board .
5. Replace the optical drive. 
Replace the display panel
6. .
Replace the front bezel.
7.  
Clean and replace the glass panel8.  . Note: This step is very important. Follow the procedures 
to ensure the glass is clean and free of particles.
Replace the access door
9. .