Service Source
iMac (USB 2.0)
Updated 6 July 2005
© 2004 Apple Computer, Inc. All rights reserved.
iMac (USB 2.0)
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1
Service Source
Basics
iMac (USB 2.0)
© 2004 Apple Computer, Inc. All rights reserved.
Overview
The iMac (USB 2.0) computers are powered by the PowerPC G4 processors. Three
models are available: the 20-inch widescreen LCD (1.25 GHZ), the 17-inch widescreen
LCD (1.25 GHZ), and the 15-inch LCD flat screen (1 GHz). The computer also includes
80GB hard drives, 256MB DDR333 SDRAM, two FireWire 400 ports and three USB 2.0
ports
.
Overview
How to identify these models
Verify the processor speed. If the system is up and running, select “About this Mac” under
the Apple icon in the Finder. Or, select the “More Info” button on the “About this Mac”
window. Apple System Profiler opens and displays the machine speed under “Hardware
Overview.” The 15-inch iMac has a 1GHz PowerPC G4 processor and the 20-inch and 17inch iMac have a 1.25GHz PowerPC G4 processor. In addition, identify these models by
their serial number.
iMac (USB 2.0) Basics -
1
What’s New
New Features, November 2003
The new 20-inch iMac (USB 2.0) has:
• a built-in 20-inch widescreen flat-panel
• a PowerPC G4 with a clock speed of 1.25 GHz
• NVidia GeForce FX5200 Ultra graphics acceleration
• SuperDrive
New Service Parts for the 20-inch iMac (USB 2.0)
• Rear Housing, 922-6138
• Rear Housing screws, 922-6219
• Inverter 922-6129
• Inverter screws, 922-6218
• LCD Display Panel, 20-inch, 661-2991
• WIre Deflector, 922-6213
• Display Bezel 922-6128
• Display Bezel screws, 922-6289
• Neck Extension, 661-2990
• Chassis, Faraday, 922-6204
• Power Supply, 661-3104
• Drive Carrier, 922-6216
• Hard Drive, 80 GB, 661-3106
• Hard Drive, 160 GB, 661-3107 (CTO only)
• SuperDrive, 661-3108
• Logic Board, 1.25 GHz, 661-2989
• Bottom Housing, 922-6288
• Fan, 922-6215
• Insulators: Rear: 922-6217; Front: 922-6214
• SDRAM, 256 MB, DDR333, SODIMM, 661-3147
• SDRAM, 256 MB, DDR333, 184-pin, 661-3145
• SDRAM, 512 MB, DDR333, 184-pin, 661-3146
2 -
iMac (USB 2.0) Basics
What’s New
Standard Configurations
Features 15-inch 17-inch 20-inch
CPU and speed
System bus
speed
Main memory
Display
Graphics IC
Graphics memory
Hard disk drive
Optical drive
Power Supply
1GHz PowerPC G4 1.25GHz PowerPC G4 1.25GHz PowerPC G4
167 MHz 167 MHz 167 MHz
256 MB, 333 MHz
DDR SDRAM,
expandable up to 1
GB
15-inch flat panel 17-inch, wide-screen
NVIDIA GeForceMX NVIDIA GeForce FX
32 MB DDR RAM 64 MB DDR RAM 64 MB DDR RAM
80 GB Ultra ATA-66
7200 rpm
Tray-load Combo
drive
160 W 160 W 190 W
256 MB, 333 MHz
DDR SDRAM, expandable up to 1 GB
flat panel
5200 Ultra
80 GB Ultra ATA-66
7200 rpm
Tray-load SuperDrive Tray-load SuperDrive
256 MB, 333 MHz
DDR SDRAM, expandable up to 1 GB
20-inch, wide-screen
flat panel
NVIDIA GeForce FX
5200 Ultra
80 GB Ultra ATA-66
7200 rpm
What’s New
External monitor adapter
Communication
features
Wireless features
Mini-VGA or Svideo/composite
10/100 Ethernet;
56K V.92 fax modem
Optional 54 Mbps
AirPort Extreme
Card; optional internal Bluetooth
Mini-VGA or S-video/
composite
10/100 Ethernet; 56K
V.92 fax modem
Optional 54 Mbps AirPort Extreme Card;
optional internal Bluetooth
Mini-VGA or S-video/
composite
10/100 Ethernet; 56K
V.92 fax modem
Optional 54 Mbps AirPort Extreme Card;
optional internal Bluetooth
iMac (USB 2.0) Basics -
3
Serial Number Location
To identify a particular model of iMac (USB 2.0), check the computer’s serial number,
which lists the model’s configuration. The serial number is located on the bottom of the
computer, on the metal access plate, or on the inside of the optical drive door (bottom
photo).
4 -
iMac (USB 2.0) Basics
Serial Number Location
Serial Number Location
iMac (USB 2.0) Basics -
5
Service Source
Take Apart
iMac (USB 2.0)
© 2004 Apple Computer, Inc. All rights reserved.
General Information
Overview: November 2003
This Take Apart chapter includes take apart procedures for the 15-inch, the 17-inch, and
the 20-inch iMac (USB 2.0) computers. New procedures for the 20-inch iMac (USB 2.0)
are listed below.
New Procedures
The following Take Apart sections were updated:
• 20-inch model: Display panel, inverter, back cover, and the neck assembly
• Replacement instructions to add copper tape on the inside of the Faraday cage when
you replace the antenna board on any of these models.
• Replacement instructions for EMI gaskets on the 20-inch panel
Tools
The following tools are recommended for the take apart procedures.
• The service stand (076-0898)
• Thermal paste (922-4757)
Torque driver, 17" LB (076-0899)
•
• 1.5 mm hex driver (for LCD bezel screws)
• #0 Phillips screwdriver)
• Torx screwdriver set (6, 8, 10, 15)
• Plastic flatblade screwdriver or stylus (922-5065)
• Needlenose pliers
• ESD wriststrap and mat
General Information
iMac (USB 2.0) Take Apart -
1
Service Stand
1. Support the computer by neck and the base (A). Gently position the computer in the
service stand with the flat panel facing up (B).
2.
Note:
The base of the computer can be rotated when servicing internal parts.
2 -
iMac (USB 2.0) Take Apart
General Information
User Access Plate
Tools
This procedure requires the following tools:
• Phillips #0 screwdriver
Part Location
User Access Plate
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
iMac (USB 2.0) Take Apart -
3
Procedure
1. Loosen the four captive screws on the access panel.
2. Remove the panel by grabbing onto two captive screws and lift the panel off the base.
4 -
iMac (USB 2.0) Take Apart
User Access Plate
AirPort Extreme Card
Tools
This procedure requires no tools.
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
AirPort Extreme Card
iMac (USB 2.0) Take Apart -
5
Procedure
1. Unplug all cables from the computer
2.
Important:
metal before you touch any parts or install any components inside the computer. To
avoid static electricity building back up in your body, do not walk around the room until
you have completed the installation and closed the computer.
3. Touch a metal surface inside the computer to ground yourself.
To avoid electrostatic discharge, always ground yourself by touching
except
the power cord.
4. Unplug the power cord.
5. Pull the plastic tab on the AirPort Extreme card to remove it from the slot. Disconnect
the AirPort antenna from the card.
6 -
iMac (USB 2.0) Take Apart
AirPort Extreme Card
Memory, SO-DIMM (userinstallable)
Tools
No tools are required for this procedure.
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
Note:
DIMMs used in this slot should be a low-profile PC2700 (DDR333) SO-DIMM. Only
the SO-DIMM slot is accessible by the user.
Memory, SO-DIMM (user-installable)
iMac (USB 2.0) Take Apart -
7
Procedure
1. Unplug all cables from the computer except the power cord.
2.
Important:
metal before you touch any parts or install any components inside the computer. To
avoid static electricity building back up in your body, do not walk around the room until
you have completed the installation and closed the computer.
3. Touch a metal surface inside the computer to ground yourself.
To avoid electrostatic discharge, always ground yourself by touching
4. Unplug the power cord.
5. Release the memory by spreading apart the tabs in the expansion slot from the
notches in the card.
8 -
iMac (USB 2.0) Take Apart
Memory, SO-DIMM (user-installable)
6. Allow the memory to pop up slightly, and pull it out of the memory slot.
Memory, SO-DIMM (user-installable)
iMac (USB 2.0) Take Apart -
9
Bottom Housing
Tools
This procedure requires the following tools:
• Torx-15 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
10 -
iMac (USB 2.0) Take Apart
Bottom Housing
Procedure
1. When opening the bottom housing, rotate the base so the optical drive door is on the
right. (This position is less stressful on the internal cables when the bottom is open).
2. Remove the four torx screws.
2.0) display has a different part number (922-6288) from the bottom housing (922-
5804) used on the 15-inch and the 17-inch iMac (USB 2.0) computers. Exchange
them like-for-like.
Note:
The bottom housing on the 20-inch iMac (USB
Replacement Note:
not have a torque driver, you will have to make sure these screws are tightened by hand
FIRMLY, BUT NOT FORCIBLY. Or, purchase the service tool (076-0899) in order to ensure
the thermal pipe is firmly mated with the top base. If the bottom housing is not securely
attached to the base in this fashion, the CPU may overheat and become damaged. For
more information, refer to “Thermal Paste Application’” in this chapter. Rotate the base so
that the optical drive door is on the right.
These torx screws must be tightened to at least 17 in.-lbs. If you do
iMac (USB 2.0) Take Apart -
11
3. Gently open the bottom housing in the direction of the arrow. Disconnect the cables.
12 -
iMac (USB 2.0) Take Apart
4. Disconnect the following:
Grounding screw
A
B
Bluetooth connector (if Bluetooth board is present, this will be connected)
C
AirPort connector
D
AC line filter connector
E
TMDS video connector
F
Inverter, speaker, fan connector
G
Optical cable and connector
H
Hard drive cable and connector
I
Power Supply connector
iMac (USB 2.0) Take Apart -
13
5. Set the bottom housing aside. Note: Before returning the bottom housing to Apple,
remove the logic board, modem, RJ-11 board, memory, Bluetooth board (if present),
antenna, AirPort Extreme card (if present), and the I/O port covers.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
14 - iMac (USB 2.0) Take Apart
Thermal Paste Application
Tools
This procedure requires the following tools:
• Plastic stylus or plastic spatula to remove the old thermal paste
• Plastic stylus or plastic spatula to spread the thermal paste
• Thermal paste (922-4757)
Part Location
Thermal Paste Application
iMac (USB 2.0) Take Apart - 15
Procedure
1. Thoroughly clean the original thermal film from the mating surfaces (circled below) of
the bottom housing and thermal pipe. Use a plastic stylus to scrape the surfaces
clean. Note: Do not use an abrasive material or liquid cleaner.
2. Squeeze a ball of thermal paste onto the mating surfaces of the thermal pipe.
16 - iMac (USB 2.0) Take Apart
Thermal Paste Application
3. Replace the bottom housing.
Warning: The bottom housing has four torx screws that must be tightened to at least
17 in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe
is firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to apply the thermal paste as described in this procedure, and failure to
tighten the torx screws as directed, could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
Thermal Paste Application
iMac (USB 2.0) Take Apart - 17
RJ-11 Modem Filter Board
Tools
This procedure requires the following tools:
• Torx-6 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
18 - iMac (USB 2.0) Take Apart
RJ-11 Modem Filter Board
Procedure
1. Remove two screws and disconnect the cable from the modem.
2. Remove the RJ-11 board from the I/O port.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
RJ-11 Modem Filter Board
iMac (USB 2.0) Take Apart - 19
Modem
Tools
This procedure requires the following tools:
• Torx-8 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
20 - iMac (USB 2.0) Take Apart
Modem
Procedure
1. Remove two screws and disconnect the cable.
2. Lift the modem board from the connector on the logic board.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
Modem
iMac (USB 2.0) Take Apart - 21
Memory (factory-installed)
Tools
This procedure requires the following tools:
• No tools are required
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
22 - iMac (USB 2.0) Take Apart
Memory (factory-installed)
Procedure
1. Push down on the ejector tabs to release the memory module.
2. Pull the memory up and out of the slot. Important: Make sure that the memory
installed on the logic board is compatible with the system. The computer accepts
double-data rate (DDR) SDRAM DIMMs. DIMMs used in this slot must fit the following
specification: PC2700 SDRAM DDR333 DIMMs for 167 MHz systems.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
Memory (factory-installed)
iMac (USB 2.0) Take Apart - 23
Battery
Tools
This procedure requires the following tools:
• No tools are required
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
24 - iMac (USB 2.0) Take Apart
Battery
Procedure
1. Using a flatblade screwdriver, gently pry the battery from the battery holder.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
Battery
iMac (USB 2.0) Take Apart - 25
Logic Board
Tools
This procedure requires the following tools:
• Phillips #2 screwdriver (for the plastic screw)
• Torx-15 screwdriver
Part Location
Note: The battery, RJ-11 board, AirPort Extreme card, modem, I/O port covers, memory
(on the top and the bottom of the logic board), Bluetooth board and the Bluetooth
extension cable need to be removed from the logic board before returning the board to
Apple for service.
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the RJ-11 board.
26 - iMac (USB 2.0) Take Apart
Logic Board
Procedure
1. Remove the three torx screws (metal) and one plastic screw.
Logic Board
iMac (USB 2.0) Take Apart - 27
2. Grab the logic board by the battery retainer and the hard drive connector. Lift the
board slightly and pull back to release the board from the bottom housing and I/O
ports. Note: The I/O port covers may come out with the logic board when it’s
removed.
3. Remove the I/O port covers from the logic board.
Warning: Whenever the logic board is separated from the bottom housing, you must
install new thermal pads to three surfaces on the bottom housing. Failure to apply these
pads whenever the logic board is separated from the bottom housing could cause these
parts to overheat and could damage internal components.
Note: AFTER installing new thermal pads, if you must briefly re-separate the logic board
from the housing, it is OK to retain the same, new pads as long as they are not handled
excessively. Refer to “Thermal Pad Installation” in this chapter for detailed information.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
28 - iMac (USB 2.0) Take Apart
Logic Board
Bluetooth Board and Cable
Tools
This procedure requires the following tools:
• Phillips #2 jeweler’s screwdriver
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the RJ-11 board.
• Remove the logic board.
Bluetooth Board and Cable
iMac (USB 2.0) Take Apart - 29
Procedure
1. Ground yourself. Remove the AirPort Extreme card and SO-DIMM memory (if
present).
2. Remove the logic board protective cover to access the Bluetooth board
30 - iMac (USB 2.0) Take Apart
Bluetooth Board and Cable
3. Remove the two screws (circled below) on the Bluetooth board.
4. Peel the Kapton tape off the Bluetooth extension cable. Disconnect the extension
cable from the Bluetooth board. Note: The Bluetooth wireless extension cable is a
separate service part from the Bluetooth board.
5. Lift the Bluetooth board from the connector on the logic board.
Warning: Whenever the logic board is separated from the bottom housing, you must
install new thermal pads to three surfaces on the bottom housing. Failure to apply these
pads whenever the logic board is separated from the bottom housing could cause these
parts to overheat and could damage internal components.
Note: AFTER installing new thermal pads, if you must briefly re-separate the logic board
from the housing, it is OK to retain the same, new pads as long as they are not handled
excessively. Refer to “Thermal Pad Installation” in this chapter for detailed information.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
Bluetooth Board and Cable
iMac (USB 2.0) Take Apart - 31
I/O Port Covers
Tools
This procedure requires the following tools:
• No tools are required
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the RJ-11 board
• Remove the logic board.
32 - iMac (USB 2.0) Take Apart
I/O Port Covers
Procedure
1. Gently pull the I/O port covers off the logic board.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
Warning: Whenever the logic board is separated from the bottom housing, you must
install new thermal pads to three surfaces on the bottom housing. Failure to apply these
pads whenever the logic board is separated from the bottom housing could cause these
parts to overheat and could damage internal components.
Note: AFTER installing new thermal pads, if you must briefly re-separate the logic board
from the housing, it is OK to retain the same, new pads as long as they are not handled
excessively. Refer to “Thermal Pad Installation” in this chapter for detailed information.
I/O Port Covers
iMac (USB 2.0) Take Apart - 33
AirPort Antenna Extension Cable
Tools
This procedure requires the following tools:
• No tools are required
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the RJ-11 board
• Remove the logic board.
34 - iMac (USB 2.0) Take Apart
AirPort Antenna Extension Cable
Procedure
1. Release the extension cable from the plastic cable clips to remove the cable from the
bottom housing.
Replacement Note: Be careful not to pinch the antenna extension cable when
replacing it.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
Warning: Whenever the logic board is separated from the bottom housing, you must
install new thermal pads to three surfaces on the bottom housing. Failure to apply these
pads whenever the logic board is separated from the bottom housing could cause these
parts to overheat and could damage internal components.
Note: AFTER installing new thermal pads, if you must briefly re-separate the logic board
from the housing, it is OK to retain the same, new pads as long as they are not handled
excessively. Refer to “Thermal Pad Installation” in this chapter for detailed information.
AirPort Antenna Extension Cable
iMac (USB 2.0) Take Apart - 35
Thermal Pad Installation
Tools
• No tools are required.
• Thermal pad kit (076-0925)
Part Location
Warning: Whenever the logic board is separated from the bottom housing, you must
install new thermal pads to two surfaces on the bottom housing. Failure to apply these
pads whenever the logic board is separated from the bottom housing could cause these
parts to overheat and could damage internal components.
Note: AFTER installing new thermal pads, if you must briefly re-separate the logic board
from the housing, it is OK to retain the same, new pads as long as they are not handled
excessively.
36 - iMac (USB 2.0) Take Apart
Thermal Pad Installation
Procedure
1. Remove the old thermal pads from the bottom housing. Note: If you don’t see the two
thermal pads on the bottom housing, check the under side of the logic board. The
thermal pads may stick to the logic board. Always remove the old thermal pads, and
install new pads if you are taking the unit apart to this level.
2. Using the thermal pad kit, remove the clear protective backing from the new thermal
pads.
3. Place the new thermal pads on the bottom housing. Press down on the blue protective
backing to make sure the thermal pad has even contact with the bottom housing.
There should be no air pockets.
4. Remove the blue protective backing from the new thermal pad. Note: Avoid
unnecessary contact with either side of the thermal pad as dirt and body oils reduce
the thermal pad's conductivity.
5. Slide the logic board back into the bottom housing (make sure the I/O port covers are
on the logic board).
Thermal Pad Installation
iMac (USB 2.0) Take Apart - 37
AC Line Filter
Tools
This procedure requires the following tools:
• Torx-10 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the RJ-11 board.
• Remove the logic board.
38 - iMac (USB 2.0) Take Apart
AC Line Filter
Procedure
1. Peel the black insulator on the bottom housing back to access the AC line filter
screws.
2. Remove two screws and lift the AC line filter from the bottom housing. Note: The port
plug may fall out of the AC filter port when you remove the AC line filter. Replace the
plug into the opening on the bottom housing before reinstalling the AC line filter.
AC Line Filter
iMac (USB 2.0) Take Apart - 39
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
Warning: Whenever the logic board is separated from the bottom housing, you must
install new thermal pads to three surfaces on the bottom housing. Failure to apply these
pads whenever the logic board is separated from the bottom housing could cause these
parts to overheat and could damage internal components.
Note: AFTER installing new thermal pads, if you must briefly re-separate the logic board
from the housing, it is OK to retain the same, new pads as long as they are not handled
excessively. Refer to “Thermal Pad Installation” in this chapter for detailed information.
40 - iMac (USB 2.0) Take Apart
AC Line Filter
Drive Carrier Assembly (Optical and Hard Drive)
Tools
This procedure requires the following tools:
• Torx-10 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand with the door facing up.
• Remove the user access plate.
• Remove the bottom housing.
Drive Carrier Assembly (Optical and Hard Drive)
iMac (USB 2.0) Take Apart - 41
Procedure
1. Rotate the base unit so the optical drive door is facing to the right.
2. Remove six screws; two on the EMI shield (with copper tape) and four attaching the
drive to the Faraday cage (chassis). Carefully lift the shield and copper tape off the
drive. Replacement Note: When replacing the drive EMI shield, be sure to use the
two shorter screws.
42 - iMac (USB 2.0) Take Apart
Drive Carrier Assembly (Optical and Hard Drive)
3. Remove the Airport and Bluetooth antennas from the plastic clip on the side of the
drive carrier.
Drive Carrier Assembly (Optical and Hard Drive)
iMac (USB 2.0) Take Apart - 43
4. Grasp the carrier by the top and bottom edges. Wiggle the drive carrier out of the
chassis pulling the carrier in the direction of the arrow. Note: The carrier fits snugly
into the chassis.
5. Disconnect the two power cables; one attaches to the optical drive and the other
attaches to the hard drive.
44 - iMac (USB 2.0) Take Apart
Drive Carrier Assembly (Optical and Hard Drive)
6. To remove the hard drive from the carrier, peel the white wrapper up to access the
screws (two on each side). Remove the screws, disconnect the data cable, and
remove the hard drive out of the carrier.
7. To remove the optical drive, remove four screws (shown by dashed lines), disconnect
the optical drive data cable (see lower arrow), and slide the optical drive out of the
carrier.
Drive Carrier Assembly (Optical and Hard Drive)
iMac (USB 2.0) Take Apart - 45
8. Note: The drive carrier on the 20-inch iMac (USB 2.0), 922-6216, is different from the
drive carrier used on the 15-inch and the 17-inch iMac (USB 2.0) computers. The 20inch iMac (USB 2.0) drive carrier is shown below.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
46 - iMac (USB 2.0) Take Apart
Power Supply
Tools
This procedure requires the following tools:
• Torx-10 screwdriver
Part Location
Power Supply
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand and rotate the door to the right.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the drive carrier assembly.
iMac (USB 2.0) Take Apart - 47
Procedure
1. Remove the two power supply screws circled below.
48 - iMac (USB 2.0) Take Apart
Power Supply
2. Open the optical drive door as shown. Support the metal plate and power supply as
you remove the four screws.
Important: The two screws near the door hinge are shorter than the other power
supply screws. Failure to replace the shorter screws into their correct location will
scratch the top housing. See step 4, Replacement Note.
Power Supply
iMac (USB 2.0) Take Apart - 49
3. Lift the power supply and metal shield out of the chassis (Faraday cage).
4. Note: The power supply on the 20-inch iMac (USB 2.0), 661-3104, is different from
the power supply used on the 15-inch and the 17-inch iMac (USB 2.0) computers. The
20-inch iMac (USB 2.0) power supply is shown below.
50 - iMac (USB 2.0) Take Apart
Power Supply
5. Replacement Note: When replacing the metal shield (see picture above) that sits on
top of the power supply, install the two shorter screws near the optical door. If the
longer screws are installed by mistake, the screws will scratch the inside of the
housing (circled below).
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
Power Supply
iMac (USB 2.0) Take Apart - 51
Optical Drive Door
Tools
This procedure requires the following tools:
• Torx-10 screwdriver
• Needlenose pliers
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the drive carrier assembly.
52 - iMac (USB 2.0) Take Apart
Optical Drive Door
Procedure
1. Remove four screws on the power supply shield. Set the shield aside.
Important: The two screws near the door hinge are shorter than the other power
supply screws. Failure to replace the shorter screws to their correct location will
scratch the top housing. See the Power Supply topic, step 4, Replacement Note, for a
picture of what happens when the wrong screws are inserted in the wrong location.
Optical Drive Door
iMac (USB 2.0) Take Apart - 53
2. Slide the optical door guide off the chassis and the door hinge tabs (circled).
3. Carefully remove the two door springs with a needlenose pliers.
54 - iMac (USB 2.0) Take Apart
Optical Drive Door
4. Remove the door hinge screws.
5. Open the door.
Optical Drive Door
iMac (USB 2.0) Take Apart - 55
6. Slide the door and hinge off the chassis.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
56 - iMac (USB 2.0) Take Apart
Optical Drive Door
Speaker, Internal
Tools
This procedure requires the following tools:
• Torx-10 screwdriver
Part Location
Speaker, Internal
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the drive carrier assembly.
iMac (USB 2.0) Take Apart - 57
Procedure
1. Loosen the two screws enough to slide the speaker off the metal posts. Disconnect
the speaker cable.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
58 - iMac (USB 2.0) Take Apart
Speaker, Internal
Fan
Tools
This procedure requires the following tools:
• Torx-15 screwdriver
Part Location
Fan
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the drive carrier assembly.
iMac (USB 2.0) Take Apart - 59
Procedure
1. Remove the two fan screws and disconnect the fan connector.
2. Pull the fan out of the chassis (Faraday cage). Note: The replacement fan includes the
mounting bracket.
3. Note: The fan on the 20-inch iMac (USB 2.0), 922-6215, is different (identify by the
amps highlighted below) from the fan used on the 15-inch and the 17-inch iMac (USB
2.0) computers. The 20-inch iMac (USB 2.0) fan is shown below.
60 - iMac (USB 2.0) Take Apart
Fan
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
Fan
iMac (USB 2.0) Take Apart - 61
Power Supply Insulators
Tools
No tools are required for this procedure.
Part Location
Note: Insulator color and transparency may vary from those shown above.
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the drive carrier assembly.
• Remove the power supply.
62 - iMac (USB 2.0) Take Apart
Power Supply Insulators
Procedure
1. Carefully pull the insulators from the chassis (Faraday cage). These are attached to
the chassis with double-sided tape.
2. Note: The insulators on the 20-inch iMac (USB 2.0), 922-6217 and 922-6214, are
different from the insulators used on the 15-inch and the 17-inch iMac (USB 2.0)
computers.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
Power Supply Insulators
iMac (USB 2.0) Take Apart - 63
Fan Retainer Bracket (under fan)
Tools
This procedure requires the following tools:
• Torx-10 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the drive carrier assembly.
• Remove the power supply.
• Remove the fan.
64 - iMac (USB 2.0) Take Apart
Fan Retainer Bracket (under fan)
Procedure
1. Remove the four screws connecting the fan bracket to the chassis (Faraday cage).
2. Lift the fan bracket out of the chassis. Note the orientation of the neck cables (see
below) in the fan bracket before removing the cables. For orientation purposes, the
drive door would be on the right.
Fan Retainer Bracket (under fan)
iMac (USB 2.0) Take Apart - 65
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
66 - iMac (USB 2.0) Take Apart
Fan Retainer Bracket (under fan)
Fan Gasket
Tools
No tools are required for this procedure.
Part Location
Fan Gasket
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the drive carrier assembly.
• Remove the power supply.
• Remove the fan.
• Remove the fan retainer bracket.
iMac (USB 2.0) Take Apart - 67
Procedure
1. Remove the fan retainer bracket and turn it over. Gently peel the fan gasket off the
back of the fan bracket.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
68 - iMac (USB 2.0) Take Apart
Fan Gasket
Cap, Neck Spoke Retainer
Tools
This procedure requires the following tools:
• Torx-10 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the drive carrier assembly.
• Remove the power supply.
• Remove the fan.
Cap, Neck Spoke Retainer
iMac (USB 2.0) Take Apart - 69
Procedure
1. Before removing the neck cap screws, note the cable routing, including the location of
the empty spoke.
2. Note: There are five screws on the neck cap. For this step, remove only the three
silver screws and the neck cap. (The two black screws secure the neck to the base.)
70 - iMac (USB 2.0) Take Apart
Cap, Neck Spoke Retainer
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
Cap, Neck Spoke Retainer
iMac (USB 2.0) Take Apart - 71
Chassis (Faraday Cage)
Tools
This procedure requires the following tools:
• Torx-10 screwdriver
• Torx-8 screwdriver for the logo screw
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the drive carrier assembly.
72 - iMac (USB 2.0) Take Apart
Chassis (Faraday Cage)
• Remove the power supply.
• Remove the fan.
• Remove the plastic cable retainer (under the fan).
• Remove the neck spoke retainer cap.
Procedure
1. Pull the neck cables/white spokes out of their slots and into a bundle. Bundle the neck
cables to one side. Supporting the base, remove the two black screws that connect
the neck to the Faraday base.
Chassis (Faraday Cage)
iMac (USB 2.0) Take Apart - 73
2. Carefully feed the neck cables through the hole in the Faraday cage. Important: The
Faraday cage is very heavy and has sharp edges; handle with care.
74 - iMac (USB 2.0) Take Apart
Chassis (Faraday Cage)
3. Pull the outer shell (with Faraday attached) away from the neck.Note: There is no
need to remove the outer shell from the Faraday unless you are replacing the antenna
or the outer shell. If you are removing the shell from the Faraday cage, go on to the
next step.
4. Perform the next step only if you are replacing the Faraday, the antenna, or the outer
shell.
5. Remove one screw in the base of the Faraday cage to separate the shell from the
Faraday cage. Note: The Faraday cage on the 20-inch iMac (USB 2.0), 922-6204, is
heavier and different from the Faraday cage used on the 15-inch and the 17-inch iMac
(USB 2.0) computers.
Chassis (Faraday Cage)
iMac (USB 2.0) Take Apart - 75
Replacement Notes:
Faraday cage: Look at the exploded view diagram during reassembly. First, attach the
Faraday top cover to the top (OUTSIDE) of the Faraday cage as shown below; the
Faraday top cover is keyed. Next, thread the neck cables through the hole in the Faraday
cage and install the Faraday cage into the top plastic housing. Replace the screw that
holds the plastic housing to the chassis. Attach the black neck cap screws to connect the
neck to the chassis. Route the neck cables correctly in the base and replace the fan
bracket retainer and three remaining neck cap screws.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
76 - iMac (USB 2.0) Take Apart
Chassis (Faraday Cage)
Antenna, Wireless
Tools
This procedure requires the following tools:
• Torx-8 screwdriver
Part Location
Antenna, Wireless
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the drive carrier assembly.
• Remove the power supply.
• Remove the power supply insulators.
• Remove the optical drive door.
• Remove the internal speaker.
• Remove the fan.
iMac (USB 2.0) Take Apart - 77
• Remove the fan bracket under the fan.
• Remove the neck spoke retainer cap.
• Remove the blind mate connector screws.
• Remove the Faraday cage.
78 - iMac (USB 2.0) Take Apart
Antenna, Wireless
Procedure
1. Remove the mounting screw and unclip the board from the Faraday cage. Remove
any tape, and carefully separate the antenna board cable from the Faraday cage.
2. Remove the second mounting screw to unclip the antenna from the Faraday cage.
Antenna, Wireless
iMac (USB 2.0) Take Apart - 79
Replacing the AirPort Antenna
Procedure
1. Attach the replacement antenna to the outside of the Faraday cage. Feed the antenna
wires through the Faraday cage and position the wires against the Faraday cage (as
shown). Note: Make certain the wires lay flat against the Faraday cage.
2. Feed the antenna wires through the hole in the Faraday cage and position the wires
against the Faraday cage (as shown). Make sure that the wires lay flat against the
inside of the Faraday cage.
80 - iMac (USB 2.0) Take Apart
Antenna, Wireless
3. Place the copper tape over the wires making sure the wires lay flat. Press the copper
tape securely against the Faraday cage.
4. Reassemble the computer and return the system to the customer.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
Antenna, Wireless
iMac (USB 2.0) Take Apart - 81
Housing, Outer Shell, Plastic
Tools
This procedure requires the following tools:
• Torx-10 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the drive carrier assembly.
• Remove the power supply.
• Remove the power supply insulators.
• Remove the optical drive door.
• Remove the fan.
• Remove the fan bracket under the fan.
82 - iMac (USB 2.0) Take Apart
Housing, Outer Shell, Plastic
• Remove the neck spoke retainer cap.
• Remove the blind mate connector screws.
Housing, Outer Shell, Plastic
iMac (USB 2.0) Take Apart - 83
Procedure
1. Remove the two black screws that connect the neck to the base.
2. Carefully feed the neck cables through the hole on the vent cap shown below.
84 - iMac (USB 2.0) Take Apart
Housing, Outer Shell, Plastic
3. Next, carefully separate the outer plastic housing from the neck.
4. Remove one screw in the base of the Faraday cage to separate the white outer shell
from the Faraday cage.
Housing, Outer Shell, Plastic
iMac (USB 2.0) Take Apart - 85
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
86 - iMac (USB 2.0) Take Apart
Housing, Outer Shell, Plastic
Display, 20" Flat Panel
Tools
This procedure requires the following tools:
• 1.5 mm hex tool
• Torx-10 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
Display, 20" Flat Panel
iMac (USB 2.0) Take Apart - 87
Procedure
1. Remove three screws that connect the back cover to the flat panel LCD display. Use
the 1.5 mm hex tool to remove these screws.
2. Support the back cover and push on the display bezel (as shown) to separate the
display bezel from the display’s back panel.
88 - iMac (USB 2.0) Take Apart
Display, 20" Flat Panel
3. Carefully raise the top side of the display and disconnect the inverter cables (yellow
circles).
Replacement Note: Important: Make sure that the inverter cables (red circles
below) are NOT pinched when the panel is lowered into place.
4. Raise the display a bit more to access the TMDS display connector. Peel back the
black tape.
Display, 20" Flat Panel
iMac (USB 2.0) Take Apart - 89
5. Disconnect the TMDS display connector by squeezing the clips (1) on each side of the
connector and gently pulling the cable (2) out of the slot.
6. Raise the panel all the way up. Disconnect the power on LED cable (on the left).
90 - iMac (USB 2.0) Take Apart
Display, 20" Flat Panel
7. Disconnect the microphone cable (on the right).
8. Separate the panel from the rear housing/shield.
9. Set the panel face down. Remove the four screws that connect the LCD panel to the
display bezel.
Display, 20" Flat Panel
iMac (USB 2.0) Take Apart - 91
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