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Service Source
iMac (Early 2006 20-inch)
Updated 13 November 2006
© 2006 Apple Computer, Inc. All rights reserved.
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iMac (Early 2006 20-inch)
Contents
What’s New 5
Manual Updates 5
iMac (Early 2006 20-inch) Product Features 6
Take Apart
General Information 10
Product View 10
How to identify your iMac 11
What’s New 12
Tools Required 14
Orientation 14
Serial Number Location 14
Safety 15
Opening the Computer 16
Access Tool Modication 16
EMI Shielding 19
Access Door 22
Memory 2
4
Front Bezel 28
Camera Board 3
6
Lower EMI Shield 42
IR Board 45
LCD Display Panel 5
0
Speakers 58
AirPort Extreme Card 6
Bluetooth Card 67
Optical Drive 7
Hard Drive 7
0
7
4
ii
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Power Supply, AC/DC 84
Logic Board 90
AC Line Filter 101
Fan, Hard Drive 105
Fan, Optical Drive 109
Fan, CPU 112
Power Supply, DC/DC, Inverter 115
Ambient Light Sensor Board 118
Cable, Camera and IR 121
Bluetooth Antenna 124
AirPort Antenna 128
Clutch Mechanism 132
Chassis 136
Rear Housing 139
Stand 142
Troubleshooting
General Information 147
Serial Number Location 147
Power On Self Test (POST) 147
DDR Memory 148
Symptom Charts 149
How to Use the Symptom Charts 149
Power Issues 150
No Video 152
Video Distortion After Waking From Sleep 154
Display 157
Optical Drive 160
Fan Sound 165
AirPort/ 168
IR Remote 169
IR Sensor/Receiver 170
Built-in iSight Camera 171
Speakers 173
iii
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Mouse 175
Keyboard 176
Error Beep(s) 177
USB 178
Views
iMac (Early 2006 20-inch)—Upper Exploded View 181
iMac (Early 2006 20-inch)—Lower Exploded View 182
Screw Chart 183
Screw Chart : iMac (Early 2006 20-inch): page 1 183
Screw Chart: iMac (Early 2006 20-inch) page 2 184
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What’s New
Manual Updates
13 November 2006
The DC/DC power supply was incorporated into the “No Power” troubleshooting steps.
•
October 2006
31 October 2006: Troubleshooting has been updated with a new symptom, “Fans running
•
at full speed after computer turns on.” Note: The customer may have entered a diagnostic
mode that causes the fans to run at full speed. This symptom is very easy to resolve at the
customer level.
Photos of the EMI tape (922-44786 and 922-5026), used to repair torn and damaged EMI
•
shielding, have been added to the EMI Shielding section in the General Information chapter.
July 2006
Troubleshooting symptom charts updated : Video Distortion After Waking From Sleep:
•
Shimmering, vertical lines, Horizontal lines
Logic Board/Take Apart
•
Added IR board to the “Preliminary Steps” list
•
In step 5, a note was added to mention the transfer of the metal brackets (clips) to the
•
new logic board if you replace the logic board
April 2006
The iMac (Early 2006) 20-inch manual has been updated to show only one antenna cable
•
attached to the AirPort card.
March 2006
A Screw Chart was added.
•
Access tool modication instructions have been added to General Information.
•
Troubleshooting symptom added: No audio from internal speakers (may hear faint putt-
•
putt or motor-boating noise).
Troubleshooting symptom added: No Video, No Boot Chime, White LED ON (Symptom 1)
•
February 2006
Take Apart chapter: the power supply, memory, AirPort antenna , and Bluetooth antenna
•
topics have been revised with new photographs.
•
iMac (Early 2006) — What’s New 5
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iMac (Early 2006 20-inch) Product Features
Logic board
Intel Core Processor 1.83 and 2.0 GHz
•
No troubleshooting LEDs
•
Battery is located on the top side of the logic board
•
AirPort Extreme and Bluetooth
Separate antennas
•
Separate parts: AirPort Extreme and Bluetooth boards
•
Memory
SO-DIMM DDR2 667 MHz, memory slot
•
Memory ejector levers are visibly dierent from the iMac G5 (iSight) models and should be
•
used as shown in the Take Apart section.
Ports
Mini-DVI video out port (for mirroring or extending the desktop)
•
Displays
LVDS (Low Voltage Dierential Signaling ) displays
•
Power Management
SMC replaces SMU (See SMC Overview and SMC Reset Procedure)
•
Diagnostics
Apple Hardware Test and Apple Service Diagnostic have new interfaces and procedures (See
•
Diagnostics)
Troubleshooting
New procedures for troubleshooting no power (See Symptom Charts)
•
New procedures for troubleshooting no video (See Symptom Charts)
•
Updated procedures for Target Disk Mode (See Using Target Disk Mode)
•
Updated procedures for formatting hard drives (See Drive Formatting for Intel-based Macs.)
•
iMac (Early 2006) — What’s New 6
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iMac (Early 2006) — What’s New 7
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iMac (Early 2006) — What’s New 8
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Service Source
Take Apart
iMac (Early 2006 20-inch)
© 2006 Apple Computer, Inc. All rights reserved.
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Product View
General Information
iMac (Early 2006 20-inch) Take Apart — General Information 10
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How to identify your iMac
On the bottom of your iMac stand, you’ll nd a label with the serial number printed on it:
This label also provides other information, including the computer conguration and an “EMC”
number (EMC No.). The EMC number is unique for different iMac models; just make note of
the EMC number on the bottom of your computer and refer to the step #1 below to identify your
model.
The EMC number for the Intel Core Duo model is 2105 for the 20-inch and 2104 for the 17-
1.
inch.
From the Apple menu, choose About This Mac. The Processor listing will show the speed
2.
of the processor followed by the processor type. It will show PowerPC G5 for the iMac G5,
iMac G5 (Ambient Light Sensor), and iMac G5 (iSight). For iMac (Early 2006) computers,
the listing will show Intel Core Duo.
The iMac (Early 2006) has several features that distinguish it from the iMac G5:
3.
A 1.83 GHz Intel Core Duo processor with a 17-inch screen, or a 2.0 GHz Intel Core Duo
•
processor with a 20-inch screen.
Comes with an ATI Radeon X1600 video card using PCI Express.
•
Comes with a mini-DV video out port.
•
iMac (Early 2006 20-inch) Take Apart — General Information 11
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What’s New
March 2006
A Screw Chart was added.
•
Access tool modication instructions were added. Refer to Opening the Computer in this
•
chapter.
Troubleshooting symptom added: No audio from internal speakers (may hear putt-putt).
•
February 2006: Memory
The photographs have been updated in the memory chapter
•
What’s Different on this iMac?
Logic board
Intel Core Processor 1.83 and 2.0 GHz
•
No troubleshooting LEDs
•
Battery is located on the top side of the logic board
•
AirPort Extreme and Bluetooth
Separate antennas
•
Separate parts: AirPort Extreme and Bluetooth boards
•
Memory
SO-DIMM DDR2 667 MHz, memory slot
•
Memory ejector levers are visibly different from the iMac G5 (iSight) models and should be
•
used as shown in the Take Apart section.
Ports
Mini-DVI video out port (for mirroring or extending the desktop)
•
Displays
LVDS (Low Voltage Differential Signaling ) displays
•
Power Management
SMC replaces SMU (See SMC Overview and SMC Reset Procedure)
•
Diagnostics
Apple Hardware Test and Apple Service Diagnostic have new interfaces and procedures (See
•
Diagnostics)
Troubleshooting
New procedures for troubleshooting no power (See Symptom Charts)
•
New procedures for troubleshooting no video (See Symptom Charts)
•
Updated procedures for Target Disk Mode (See Using Target Disk Mode)
•
iMac (Early 2006 20-inch) Take Apart — General Information 12
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Updated procedures for formatting hard drives (See Drive Formatting for Intel-based Macs.)•
iMac (Early 2006 20-inch) Take Apart — General Information 13
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Tools Required
The following tools are required to service the computer. Note that a special access card (part 922-
7172) is required to open the front bezel.
ESD-safe workstation and mat
•
Soft, clean towel or cloth (to protect the display and removed parts from scratches)
•
Access card to open the rear cover (part 922-7172)
•
Black stick (or other nonconductive nylon or plastic at-blade tool)
•
Phillips #1 screwdriver
•
Phillips #2 screwdriver
•
Torx T8 screwdriver (magnetized)
•
Torx T6 screwdriver (magnetized)
•
Torx T10 screwdriver (magnetized)
•
Flat-blade screwdriver
•
Orientation
For most repairs, the unit should be placed screen-side up, with the bottom facing toward you.
Most photos in this manual reect that orientation. The SO-DIMM slot is located beneath the front
bezel and is more easily accessed with the unit laying-down on a soft, clean cloth.
Serial Number Location
iMac (Early 2006) serial number is located on the bottom of the computer stand.
iMac (Early 2006 20-inch) Take Apart — General Information 14
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Safety
Warning: When the iMac (Early 2006) is under power, be aware that the power supply contains
high voltages that pose a potential hazard to your personal safety. Never work on or near the
power supply with the unit powered on, and as a further precaution always make sure the unit is
unplugged when working on it with the front bezel removed.
WARNING: HIGH VOLTAGE
Text or photographs marked by this symbol indicate that a potential hazard to your personal safety
exists from a high voltage source.
The AC/DC power supply board is a high voltage source with the unit under power, and remains
powered up whenever the system is plugged in, whether or not the system is turned on. Use
extreme caution when troubleshooting the system with the front bezel removed.
Disconnect power to the system before performing maintenance.
•
Don’t work alone. In the even of an electrical shock it is important to have another
•
individual present who can provide assistance.
Keep one hand in your pocket when working on any iMac (Early 2006) that is plugged
•
in. This will help ensure that your body does not provide a path to ground in the event
that you accidentally make contact with the line voltage.
Don’t wear jewelry, watches, necklaces, or other metallic articles that could present a risk
•
if they accidentally make contact with the power supply circuitry.
iMac (Early 2006 20-inch) Take Apart — General Information 15
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Opening the Computer
Apple authorized, desktop certied technicians only should ever remove the front bezel on the
iMac (Early 2006). When the front bezel is removed, be sure to always ground yourself and follow
ESD-safe repair practices
Removing the front bezel requires using a special access card (part 922-7172) to release latches
located inside the upper corners of the front bezel. Slightly bending the upper quarter of the
access tool card will help engage the latch more securely.
As you are inserting the card to disengage the latch you should squeeze the top of the bezel, that
will help take pressure off of the latch and enable it to open easier. Note: If the bezel won’t open,
try cutting the card lengthwise into 3/4 inch or 1.5 cm strips. Insert the card on a 45º angle, aimed
toward the outer corner, and try again.
Once the card has been released it is safe to open the bezel. See the Front Bezel Take Apart
procedure for more information.
Access Tool Modication
If you wish to modify the access card tool, order kit 076-1213. The kit contains an access card and
a piece of EMI gasket that can be cut and added to the top of the card. The additional thickness
on the card will improve the chances of making contact with each bezel latch.
Remove the tape on the gasket to expose the sticky side of the gasket. Attach the sticky side
1.
of the EMI gasket to the top of the access card.
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Cut the EMI gasket to the edge of the access card.
2.
Using packing tape, or something equivalent, fold the tape over the EMI gasket to attach the
3.
gasket to the card.
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Bend the card at a slight angle at the top to make sure the card makes contact with each
4.
latch.
Refer to Removing the Front Bezel for the complete procedure.
5.
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EMI Shielding
The iMac enclosure is wrapped in EMI shielding that is easily torn and damaged. To maintain
a properly shielded unit, you must repair all accidental tears and cracks to the shielding by
covering them with EMI tape. Order EMI tape, part number 922-4786 (a long, thin strip) or 922-EMI tape, part number 922-4786 (a long, thin strip) or 9225026 (short, wide strips).
Pay particular attention to the EMI shielding inside the rear housing, shown below. The EMI shield
is easily damaged when replacing modules.
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Lower EMI Shield
EMI tape covers the top and sides of the display panel, and the lower EMI shield covers the logic
board along the bottom of the unit. The EMI tape and lower EMI shield are easily damaged when
removed, and removal is necessary in order to access most components within the unit.
Should the EMI tape that seals the display, or the EMI shield covering the bottom of the enclosure
(see photo below) accidentally tear, use the EMI tape (922-4786 or 922-5026) to repair and
completely seal the unit.
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When properly repaired, all edges shown below will be wrapped by EMI tape, and the tape
securely adhered to all edges. Use a “black stick” to atten the EMI tape tightly and rub out air
pockets and wrinkles.
iMac (Early 2006 20-inch) Take Apart — General Information 21
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Access Door
Tools
Phillips #2 screwdriver
•
ESD-safe workstation and mat
•
Soft , clean towel or cloth
•
Preliminary Steps
Before you begin, lay the computer down so the panel is face down and the bottom is facing
you.
Part Location
iMac (Early 2006 20-inch) Take Apart — Access Door 22
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Removing the Access Door
Raise the stand and use a Phillips #2 screwdriver, to loosen the two captive access door
1.
screws.
Warning: The ambient light sensor is located to the left. Don’t mistake the ambient light
sensor for a screw. Sticking a screw driver or other sharp object in the ambient light sensor
could damage the computer.
Remove the access door.
2.
Replacing the Access Door
Position the access door on the rear housing over the memory compartment.
1.
Lift the stand out of the way.
2.
Use a Phillips #2 screwdriver to tighten the captive screws.
3.
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Memory
Tools
Phillips #2 screwdriver
•
ESD mat, soft , clean towel or cloth
•
Preliminary Steps
Before you begin, lay the computer down so the panel is face down with the bottom is facing
you; and remove the access door.
Part Location
iMac (Early 2006 20-inch) Take Apart — Memory 24
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Removing the Memory
After removing the access door, touch the metal frame around the memory compartment to
1.
discharge any static electricity from your body.
Important: Always discharge static before you touch any parts such as the memory board.
To avoid generating static electricity, do not walk around the room until you have nished
replacing the memory.
Pull the two levers in the memory compartment toward you. If a memory module is installed
2.
in the slot, pulling the levers will dislodge it. Note: The levers are used to remove memory
not to install memory. Always install memory my hand.
a
Set the memory module aside.
3.
iMac (Early 2006 20-inch) Take Apart — Memory 25
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Replacing the Memory
Make sure the DIMM levers are all the way open.
1.
With the computer face down, orient the DIMM with the notch on the left.
2.
With your ngers, press the DIMM fully into the slot until you hear a click. After inserting the
3.
memory, fold the DIMM levers closed. There will be a slight resistance and you will hear a
click when they fold into the closed position.
Replace the access door on the memory compartment.
4.
Use a Phillips #2 screwdriver to tighten the captive screws on the access door.
5.
iMac (Early 2006 20-inch) Take Apart — Memory 26
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iMac (Early 2006 20-inch) Take Apart — Memory 27
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Front Bezel
Tools
This procedure requires the following tools:
Torx T8 screwdriver
•
Access card tool 922-7172
•
Preliminary Steps
Before you begin, remove the access door.
Part Location
iMac (Early 2006 20-inch) Take Apart — Front Bezel 28
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Removing the Front Bezel
Position unit on rear cover with the stand facing you.
1.
Tilt up the front bezel and remove four screws along the bottom.
2.
Warning: The ambient light sensor is located in the second hole from the right. Don’t
mistake the ambient light sensor for a screw. Sticking a screwdriver or other sharp object in
the ambient light sensor could damage the computer.
Locate the access card. Bending the upper quarter of the access tool card will help engage
3.
the latch. Note: Refer to Access Tool Modication in the General Information chapter if the
bezel is dicult to open.
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This picture shows how the access tool works. Pushing the tool up the vent on the rear cover
4.
releases the latches on the inside of the front bezel. Refer to the next step for the procedure.
Start on the left side (looking from the back of the unit). As you insert the card to disengage
5.
the latch, squeeze the top of the bezel, that will help take pressure o of the latch and
enable it to open easier. As the bezel releases, pull the bezel away from the rear housing.
Note: If the bezel won’t open, try cutting the card lengthwise into 3/4 inch or 1.5 cm strips.
Insert the card on a 45º angle, aimed toward the outer corner, and try again.
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Repeat step 5 to release the locking latch in the right corner. Again, pull the bezel away as
6.
the card releases the latch.
If the bezel won’t release, pull the bottom of the bezel out a bit and insert the access card
7.
again.
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Repeat step 7 for the left side.
8.
Once the access card has been removed, it is safe to open the bezel. Position the unit on an
9.
ESD mat, with the bottom facing toward you. Lift up the top of the bezel and pull it up and
slightly toward you. Caution: Make sure the memory eject levers are not protruding from the
access door when you lift the bezel up.
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Swing the bezel up so you can disconnect two cables on the camera board at the top of the
10.
bezel.
Remove the any kapton tape and disconnect the camera and microphone cables from the
11.
camera board.
Lift the front bezel o the computer. If replacing a damaged front bezel, also remove the
12.
camera board. Note the microphone is part of the front bezel assembly.
iMac (Early 2006 20-inch) Take Apart — Front Bezel 33
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Replacing the Front Bezel
Make sure the black EMI shielding along the top of the LCD panel is not in the way of the
1.
locking mechanisms when you lower the front bezel onto the computer. Use a black stick to
press (re-stick) the EMI shielding along the top of the panel.
Connect the camera and microphone cables (on the camera board) to the cables sticking
2.
out of the top of the computer.
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Tuck the cables neatly into the channel on the rear housing.
3.
Press the memory ejector levers into the closed position.
4.
Continue to lower the font bezel down and press the top corners of the front bezel to
5.
connect the latches. Note: Check that the latches are connected by lifting the front bezel at
each corner.
Replace the four bezel mounting screws along the bottom of the computer.
6.
Replace the access door; tighten the two captive screws.
7.
iMac (Early 2006 20-inch) Take Apart — Front Bezel 35
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Camera Board
Tools
Torx T6 screwdriver
•
ESD mat, soft , clean towel or cloth
•
Preliminary Steps
Before you begin, remove the access door and front bezel.
Part Location
iMac (Early 2006 20-inch) Take Apart — Camera Board 36
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Removing the Camera Board
The camera board and cables are visible as you lift the front bezel o the computer.
1.
Disconnect the camera and microphone cables.
2.
iMac (Early 2006 20-inch) Take Apart — Camera Board 37
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3.
Remove the two T6 screws on the camera board.
4.
Peel back the clear mylar material to free the microphone cable from the camera board.
iMac (Early 2006 20-inch) Take Apart — Camera Board 38
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Remove the camera board from the front bezel.
5.
iMac (Early 2006 20-inch) Take Apart — Camera Board 39
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Replacing the Camera Board
Replace the camera board on the front bezel. Carefully align and insert the camera lens until
1.
it is snug in the bezel aperture
Replace the two screws on the camera board. Route the microphone cable under the clear
2.
mylar.
Connect the camera and microphone cables.
3.
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Tuck the camera board cables neatly into the channel on the rear housing.
4.
Position the memory ejector levers into the closed position.
5.
Continue to lower the font bezel down over the pull rings (in the memory compartment)
6.
and then lower the top corners of the front bezel so they connect with the magnetic latches.
Note: check that the latches are connected by lifting the front bezel at each corner.
Replace the bezel screws along the bottom of the computer.
7.
Replace the access door; tighten the two captive screws
8.
iMac (Early 2006 20-inch) Take Apart — Camera Board 41
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Lower EMI Shield
Tools
The only tool required for this procedure is a black stick (or other nonconductive nylon or plastic
at-blade tool).
Preliminary Steps
Before you begin, remove the following:
Access door
•
Front bezel
•
Part Location
iMac (Early 2006 20-inch) Take Apart — Lower EMI Shield 42
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Removing the Lower EMI Shield
Carefully peel the lower EMI shield o the bottom edge of the rear housing. Use a black
1.
stick to help peel back the shield.
Gently lift the EMI shield to rest of the way to expose the other modules.
2.
•
iMac (Early 2006 20-inch) Take Apart — Lower EMI Shield 43
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Replacing the Lower EMI Shield
Position the lower EMI shield over the bottom of the unit so that the holes (for the IR board
1.
and the LED) in the shield are properly aligned.
Press the sticky, edge of the EMI shield onto the bottom side of the display panel. The crease
2.
in the EMI shield should align with the edge of the panel.
Fold down the EMI shield and press it rmly over the bottom edge of the rear housing. Use a
3.
black stick to rub out any air bubbles and ensure that the EMI shield adheres rmly and
without wrinkles along all edges.
Make sure the memory eject levers are in the closed position as shown above.
4.
Replace the front bezel.
5.
Replace the access door.
6.
iMac (Early 2006 20-inch) Take Apart — Lower EMI Shield 44
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IR Board
Tools
The only tool required for this procedure is a Torx T6 screwdriver.
Preliminary Steps
Before you begin, remove the following:
Access door
•
Front bezel
•
Lower EMI shield
•
Part Location
iMac (Early 2006 20-inch) Take Apart — IR Board 45
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Removing the IR Board
Disconnect the IR cable and the two T6 screws on the IR board. Lift the IR board from its
1.
mounting bracket.
Using a Torx T6 screwdriver, remove the two IR board mounting screws. Remove the IR board
2.
mounting bracket from the logic board.
iMac (Early 2006 20-inch) Take Apart — IR Board 46
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Note: If you are replacing the IR cable, you must remove the optical drive and disconnect the
3.
cable from the logic board.
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Replacing the IR Board
If removed, route the IR cable as shown below and make sure the cable is connected to the
1.
logic board near the optical drive and to the IR board near the memory.
Install the IR board mounting bracket, IR board, and screws.
2.
iMac (Early 2006 20-inch) Take Apart — IR Board 48
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Replace the lower EMI shield.
3.
Position the memory eject levers into the closed position.
4.
Replace the front bezel.
5.
Replace the access door.
6.
iMac (Early 2006 20-inch) Take Apart — IR Board 49
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LCD Display Panel
Tools
Torx T6 screwdriver.
•
Torx T10 screwdriver
•
Black stick (or other nonconductive nylon or plastic at-blade tool)
•
Preliminary Steps
Before you begin, remove the following:
Access door
•
Front bezel
•
Lower EMI shield
•
Part Location
iMac (Early 2006 20-inch) Take Apart — Display Panel 50
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Removing the Display Panel
Peel the bottom of the EMI shield o the frame.
1.
Peel the EMI shield up all the way.
2.
iMac (Early 2006 20-inch) Take Apart — Display Panel 51
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Using the access tool, a black stick, or your ngers, peel the black EMI tape o the right and
3.
left sides of the panel.
Using the access tool or black stick, peel back the black EMI tape stuck along the entire
4.
length of the top panel.
iMac (Early 2006 20-inch) Take Apart — Display Panel 52
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Using a Torx T6 screwdriver, remove the two LVDS connector screws. Pull the black tab on the
5.
connector to disconnect the LVDS cable from the logic board.
Using a Torx T10 screwdriver, remove the four panel mounting screws.
6.
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Lift the panel up just enough to see the inverter cables on the left side (Note: this shows the
7.
iMac G5 computer, but the procedure is the same).
Disconnect the two panel-to-inverter cables on the bottom left side of the display.
8.
Replacement Note: The cable connectors are marked with dots to indicate “right-side-up”.
iMac (Early 2006 20-inch) Take Apart — Display Panel 54
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Raise the panel up the rest of the way to locate the two inverter cables on the top left side of
9.
the display. Replacement Note: The cable connectors are marked with dots to indicate
“right-side up”.
Lift the panel o the computer.
10.
Note: If replacing the display panel, remove the lower EMI shield (if still attached), the display
panel mounting brackets, and the LVDS cable from the back of the display panel before
returning the module to Apple.
iMac (Early 2006 20-inch) Take Apart — Display Panel 55
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Replacing the Display Panel
Replace the LVDS cable on the rear of the display panel.
1.
If removed, replace the metal panel mounting brackets to each side of the display.
2.
Connect the four inverter-to-display cable connectors. Remember the connectors are keyed;
3.
dot-side-up.
Replace the display panel with four mounting screws.
4.
Connect the LVDS cable connector to the logic board and secure it with two screws.
5.
Fold the EMI tape rmly over the left, top, and right edges of the display panel. Use your
6.
ngers or the black stick to adhere the tape rmly and rub out wrinkles. Note: If the tape
was ripped or damaged, replace the damaged EMI tape with new EMI tape
Replace the lower EMI shield. Press the EMI shield along the bottom and sides of the
7.
computer frame.
Replace the front bezel.
8.
Replace the access door.
9.
iMac (Early 2006 20-inch) Take Apart — Display Panel 56
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iMac (Early 2006 20-inch) Take Apart — Display Panel 57
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Speakers
Tools
Torx T10 screwdriver
•
Preliminary Steps
Before you begin, remove the following:
Access door
•
Front bezel
•
Lower EMI shield
•
Display Panel
•
Part Location
iMac (Early 2006 20-inch) Take Apart — Speakers 58
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Removing the Speakers
Using a T10 torx screwdriver, remove the screws from the left and right speakers.
1.
Replacement Note: The longer of the two speaker mounting screws is used to secure the
left speaker; the shorter screw secures the right speaker.
Note the speaker cable routing before removing the speakers. The speaker wire runs around
2.
the AirPort Extreme card and above the heatsink.
iMac (Early 2006 20-inch) Take Apart — Speakers 59
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3.
Lift the speakers up and out of the computer. See the next photo for disconnecting the
speaker.
Under the right speaker, disconnect the speaker cable from the logic board.
4.
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Replacing the Speakers
Connect the speaker cable to the logic board.
1.
Install the speakers and route the speaker wire above the heatsink and around the AirPort
2.
Extreme card.
Secure the right speaker with the smaller of the two mounting screws.
3.
Secure the left speaker with the longer of the two mounting screws.
4.
Replace the display panel.
5.
Replace the lower EMI shield.
6.
Replace the front bezel.
7.
Replace the access door.
8.
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iMac (Early 2006 20-inch) Take Apart — Speakers 62
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AirPort Extreme Card
Tools
Torx T6 screwdriver
•
Preliminary Steps
Before you begin, remove the following:
Access door
•
Front bezel
•
Lower EMI shield
•
Part Location
iMac (Early 2006 20-inch) Take Apart — AirPort Extreme Card 64
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Removing the AirPort Extreme Card
Using a T6 torx screwdriver, remove the two screws and disconnect the gray antenna from
1.
the AirPort Extreme card.
The board pops up when the screws are removed. Pull the AirPort Extreme card out of the
2.
slot in the direction of the arrow.
iMac (Early 2006 20-inch) Take Apart — AirPort Extreme Card 65
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Replacing the AirPort Extreme Card
Align the AirPort Extreme card with the slot on the logic board. Insert the board into the slot.
1.
Replace the two AirPort Extreme card screws.
2.
Connect the antenna cable to the lower connector on the AirPort Extreme card.
3.
Replace the lower EMI shield.
4.
Replace the front bezel.
5.
Replace the access door.
6.
iMac (Early 2006 20-inch) Take Apart — AirPort Extreme Card 66
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Bluetooth Card
Tools
Torx T6 screwdriver
•
Preliminary Steps
Before you begin, remove the following:
Access door
•
Front bezel
•
Lower EMI shield
•
Speakers
•
Part Location
iMac (Early 2006 20-inch) Take Apart — Bluetooth Card 67
Page 68
Removing the Bluetooth Card
Using a T6 torx screwdriver, remove the two T6 screws on the Bluetooth card and disconnect
1.
the antenna from the card.
Lift the card o the logic board.
2.
iMac (Early 2006 20-inch) Take Apart — Bluetooth Card 68
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Replacing the Bluetooth Card
Press the Bluetooth card onto the logic board connector. Note: Make sure the card and
1.
antenna are securely connected before installing the speakers.
Connect the Bluetooth antenna to the Bluetooth card.
2.
Replace the two T6 Bluetooth card screws.
3.
Replace the speakers and speaker screws.
4.
Replace the lower EMI shield.
5.
Replace the front bezel.
6.
Replace the access door.
7.
iMac (Early 2006 20-inch) Take Apart — Bluetooth Card 69
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Optical Drive
Tools
Torx T10 screwdriver
•
Torx T6 screwdriver
•
Flat-blade screwdriver
•
Preliminary Steps
Before you begin, remove the following:
Access door
•
Front bezel
•
Lower EMI shield
•
Display Panel
•
Part Location
iMac (Early 2006 20-inch) Take Apart — Optical Drive 70
Page 71
Removing the Optical Drive
Looking at the circles below, starting with the top circle, do the following:
1.
Peel back the silver EMI tape going from the chassis frame to the optical drive, remove the
two T6 screws on the optical drive ex cable, disconnect the exible cable and the optical
drive sensor cable from the logic board.
Caution: Never press down on or grasp the body of the optical drive. Pressing or squeezing
the body of the optical drive could damage the mechanism.
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Locate the black release levers on the mounting bracket. Using a at-blade screwdriver as
2.
shown, press straight down at the base of the release lever, while pushing the release lever
toward the center of the drive. Pressing down disengages the lever from the chassis. Repeat
the process to unhook the other release lever. Refer to step 4 for another visual aide.
3.
Repeat the release process on the second lever. Press down with the screwdriver, press the
lever inward, toward the center of the optical drive. Lift the drive out of the housing.
iMac (Early 2006 20-inch) Take Apart — Optical Drive 72
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This photo shows the optical drive out of the computer so you can visualize how the clips
4.
move. Pressing down (#1) releases the clips (#2) outward from the metal chassis.
Caution: Never press down on or grasp the body of the optical drive when removing or
installing it. Pressing or squeezing the body of the optical drive could damage the
mechanism.
If replacing the optical drive, use a T6 torx screwdriver to remove two ex cable screws
5.
attaching to the optical drive. Note: Disconnect the ex cable and transfer it to the
replacement drive. Go on to the next step.
iMac (Early 2006 20-inch) Take Apart — Optical Drive 73
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If replacing the optical drive, disconnect the sensor cable from the optical sensor located on
6.
the underside of the optical drive. Transfer the sensor cable to the replacement drive.
7.
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Replacing the Optical Drive
Install the ex cable to the optical drive with two T6 screws.
1.
Insert the optical drive bezel into the rear housing, lining up the bezel with the slot opening
2.
(#1) . Be sure to align the two guide holes in the front bezel with guide posts at each end of
the drive access hole.
Push down on the mounting brackets (#2) to lock the optical drive securely into place on the
chassis.
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 mechanism.
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Connect the optical sensor cable to the logic board, attach the ex cable and secure it with
3.
the T6 screws, and reattach the silver EMI tape.
Replace the display panel.
4.
Replace the lower EMI shield.
5.
Replace the front bezel.
6.
Replace the access door.
7.
iMac (Early 2006 20-inch) Take Apart — Optical Drive 76
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Hard Drive
Tools
Torx T10 screwdriver
•
Preliminary Steps
Before you begin, remove the following:
Access door
•
Front bezel
•
Lower EMI shield
•
Display Panel
•
Part Location
iMac (Early 2006 20-inch) Take Apart — Hard Drive 77
Page 78
Removing the Hard Drive
Remove the two T10 screws attaching the hard drive to the DC/DC inverter board
1.
Disconnect the hard drive sensor cable from the connector on the logic board. Note the
2.
location of the sensor on the side of the hard drive and the routing of the cable.
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The hard drive sensor is dierent from the optical drive sensor. The hard drive sensor can be
3.
identied by resistor R1700. Replacement Note: Make sure to transfer the sensor to the
replacement hard drive. Use the double-stick tape enclosed with the replacement hard drive
to attach the sensor.
Holding the drive by the metal bracket, pull the hard drive toward the inverter and then up
4.
to release the hard drive mounting pins from the grommets on the chassis.
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Disconnect the hard drive power and data cables.
5.
If you are replacing the hard drive, remove the temperature sensor, mounting bracket, and
6.
mounting pins (circled) before returning the drive to Apple. Transfer these parts to the
replacement drive.
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Replacing the Hard Drive
Attach the hard drive sensor and sensor cable to the side of the hard drive.
1.
Attach the mounting bracket and pins if they were removed. Connect the hard drive data
2.
and power cables.
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Route the hard drive sensor cable under the metal chassis. Connect the sensor cable to the
3.
logic board.
Insert the hard drive pins into the grommets. Lower the drive into the rear housing.
4.
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Secure the two T10 screws on the hard drive mounting bracket to the DC/DC/inverter board.
5.
Replace the display panel.
6.
Replace the lower EMI shield.
7.
Replace the front bezel.
8.
Replace the access door.
9.
iMac (Early 2006 20-inch) Take Apart — Hard Drive 83
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Power Supply, AC/DC
Tools
Torx T10 screwdriver
•
Preliminary Steps
Before you begin, remove the following:
Access door
•
Front bezel
•
Lower EMI shield
•
Display panel
•
Hard drive
•
Logic board
•
Part Location
iMac (Early 2006 20-inch) Take Apart —Power Supply, AC/DC 84
Page 85
Removing the AC/DC Power Supply
WARNING: The AC/DC power supply PCB remains powered up whenever the system is
plugged in, whether or not the system has been turned on. Use extreme caution when
troubleshooting the system with the front bezel removed.
Don’t work alone. In the event of an electrical shock it is important to have another
•
individual present who can provide assistance.
Keep one hand in your pocket when working on any iMac (Early 2006) system that is
•
plugged in. This will help ensure that your body does not provide a path to ground in
the event that you accidentally make contact with the line voltage.
Don’t wear jewelry, watches, necklaces, or other metallic articles that could present a
•
risk if they accidentally make contact with the power supply circuitry.
Using a torx screwdriver, remove four screws from the AC-DC board. The top left screw also
1.
connects a ground cable to the chassis; leave it attached to the chassis. Replacement Note:
Install the machine screw (to bottom right corner) rst when installing the power supply.
iMac (Early 2006 20-inch) Take Apart —Power Supply, AC/DC 85
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Lift the power supply up and locate the cable tucked under the inverter. Disconnect the
2.
cable.
Locate the cable that connects the AC-DC power supply to the AC line lter. The cable is
3.
tucked under the metal chassis. With your ngers or a black stick, pry the cable free from the
chassis and disconnect it. Lift the power supply out of the chassis.
iMac (Early 2006 20-inch) Take Apart —Power Supply, AC/DC 86
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Replacing the AC/DC Power Supply
WARNING: The AC/DC power supply PCB remains powered up whenever the system is
plugged in, whether or not the system has been turned on. Use extreme caution when
troubleshooting the system with the front bezel removed.
Don’t work alone. In the event of an electrical shock it is important to have another
•
individual present who can provide assistance.
Keep one hand in your pocket when working on any iMac (Early 2006) system that is
•
plugged in. This will help ensure that your body does not provide a path to ground in
the event that you accidentally make contact with the line voltage.
Don’t wear jewelry, watches, necklaces, or other metallic articles that could present a
•
risk if they accidentally make contact with the power supply circuitry.
Route the AC lter cable under the chassis. The cable routes as shown below.
1.
iMac (Early 2006 20-inch) Take Apart —Power Supply, AC/DC 87
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Reconnect the power supply to AC line lter cable. Tuck the cable under the metal chassis.
2.
Connect the AC-DC power supply cable to the inverter. Tuck the cable under the inverter
3.
board.
iMac (Early 2006 20-inch) Take Apart —Power Supply, AC/DC 88
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Replace the power supply screws. Install the machine screw (bottom right corner) rst when
4.
installing the power supply.
Replace the hard drive.
5.
Replace the logic board.
6.
Replace the display panel.
7.
Replace the lower EMI shield.
8.
Replace the front bezel.
9.
Replace the access door.
10.
Replace the display panel.
11.
Replace the lower EMI shield.
12.
Replace the front bezel.
13.
Replace the access door.
14.
iMac (Early 2006 20-inch) Take Apart —Power Supply, AC/DC 89
Page 90
Logic Board
Tools
Torx T10 screwdriver
•
Preliminary Steps
Before you begin, remove the following:
Access door
•
Front bezel
•
Lower EMI shield
•
Display Panel
•
IR Board
•
Speakers
•
Part Location
iMac (Early 2006 20-inch) Take Apart —Logic Board 90
Page 91
Removing the Logic Board
Disconnect the AirPort and Bluetooth antennas.
1.
Disconnect the optical cable, ex cable, and peel back the silver EMI tape from the logic
2.
board frame.
Disconnect ten cables from the connectors on the logic board.
3.
iMac (Early 2006 20-inch) Take Apart —Logic Board 91
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Using a T10 torx screwdriver, remove the seven screws on the board. Replacement Note:
4.
Always install the machine screws before installing the self-tapping screws
At the top of the heatsink, remove the two screws attaching the logic board support
5.
brackets (clips) to the chassis. Note: The support brackets (clips) must be removed and
transferred to the new logic board, if replacing the logic board.
iMac (Early 2006 20-inch) Take Apart —Logic Board 92
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Holding the board on each side, lift it up and toward the top of the computer. Note: Remove
6.
the memory module from the slot before returning the board to Apple
Important: When handling the logic board, never handle the board by the heatsink or metal
7.
rails.
iMac (Early 2006 20-inch) Take Apart —Logic Board 93
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Replacing the Logic Board
Position all the logic board cables out of the way so the logic board can be placed into the
1.
rear housing.
As you lower the board into the rear housing, make sure the memory levers are lowered
2.
through the access door opening and the logic board screw holes line up with the board..
At the top of the heatsink, replace the two screws attaching the logic board support bracket
3.
to the chassis. Note: The support brackets (clips) must be removed and transferred to the
new logic board, if replacing the logic board.
iMac (Early 2006 20-inch) Take Apart —Logic Board 94
Page 95
Make sure the hard drive sensor and the sensor cable are attached to the side of the hard
4.
drive. Route the sensor cable under the chassis and connect it to the logic board.
Replace the optical drive sensor cable, ex cable and screws, and the silver EMI tape.
5.
iMac (Early 2006 20-inch) Take Apart —Logic Board 95
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Using a T10 torx screwdriver, replace the seven screws on the board. Always install the
6.
machine screws before installing the self-tapping screws.
Connect the cables to the connectors on the logic board.
7.
iMac (Early 2006 20-inch) Take Apart —Logic Board 96
Page 97
Connect the AirPort and Bluetooth antennas.
8.
Replace the speakers.
9.
Replace the IR board.
10.
Replace the display panel.
11.
Replace the lower EMI shield.
12.
Replace the front bezel.
13.
Replace the memory access door.
14.
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