Apple iMac 20 late 2006 Service Manual

 Service Source

iMac (20-inch Late 2006)

13 December 2007

© 2006 Apple Inc. All rights reserved.

iMac (20-inch Late 2006)

Contents

Take Apart

General Information 6

Product View 6
Serial Number Location 7
Tools Required 9
Safety 10
Access Tool Modication 11

What’s New 17

Access Door 19

Front Bezel 21

Camera Board 29

Lower EMI Shield 35

IR Board 38

Battery 43

LCD Display Panel 45

Memory 52

Speakers 56

AirPort Extreme Card 60

Bluetooth Card 65

Optical Drive 68

Hard Drive 76

Power Supply 83

Logic Board 89

AC Power Inlet 99

ii

Fan, Hard Drive 103

Fan, Optical Drive 107

Fan, CPU 110

Inverter 113

Ambient Light Sensor Board 117

Cable, Camera and IR 120

Bluetooth Antenna 123

AirPort Antennas 127

Clutch Mechanism 131

Chassis 135

Rear Housing 139

Stand 142

Cable, AC/DC SATA, Inverter Power 146

Troubleshooting

General Information 151

Symptom Charts 156

How to Use the Symptom Charts 156
Power Issues 157
No Video 158
Video Distortion After Waking From Sleep 160
Display 163
Optical Drive 167
Fan Sound 172
AirPort 176
Bluetooth 177
IR Remote 178
IR Sensor/Receiver 179
Built-in iSight Camera 180
Speakers 182
Mouse 183
Keyboard 184
Error Beep(s) 185
USB 186

iii

Views

iMac (20-inch Late 2006)—Upper Exploded View 188
iMac (20-inch Late 2006)—Lower Exploded View 189

Screw Chart 190

Screw Chart : iMac (20-inch Late 2006): page 1 190

iv

 Service Source

Take Apart

iMac (20-inch Late 2006)

© 2006 Apple Computer, Inc. All rights reserved.

Product View

General Information

iMac (20-inch Late 2006) Take Apart — General Information 6

Serial Number Location

On the bottom of your iMac stand, you’ll nd a label with the serial number printed on it:

Serial Number Location

iMac (20-inch Late 2006) Take Apart — General Information 7

What’s New on the iMac (20-inch Late 2006)?

Logic board

Intel Core 2 Duo Processor running at 2.16 or 2.33 GHz•

AirPort Extreme and Bluetooth antennas

Separate antennas: Two AirPort antennas, one Bluetooth antenna •

Inverter Board

New service part, 661-4112. It serves as the at panel backlight controller.•

Camera Board

New service module, 661-4113, is smaller than previous camera boards.•

Memory

Supports up to 3 GB system memory•
Supports two standard PC2-5300 DDR2 SO-DIMM modules•

Rear cover and Front bezel

New part numbers (922-7769 and 922-7875) with slight revisions to each part•

DC-DC Board

There is no DC/DC board. The functionality previously accomplished on the DC/DC board has •
been integrated into the logic board

iMac (20-inch Late 2006) Take Apart — General Information 8

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•

iMac (20-inch Late 2006) Take Apart — General Information 9

Safety

Warning: When the iMac (20-inch Late 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 maintenan• ce.
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 (20-inch Late 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 (20-inch Late 2006) Take Apart — General Information 10

Opening the Computer

Apple authorized, desktop certied technicians only should ever remove the front bezel on the
iMac (20-inch Late 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 Modication

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.

iMac (20-inch Late 2006) Take Apart — General Information 11

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.

iMac (20-inch Late 2006) Take Apart — General Information 12

Bend the card at a slight angle at the top to make sure the card makes contact with each 4.
latch.

Refer to 5. Removing the Front Bezel for the complete procedure.

6.

iMac (20-inch Late 2006) Take Apart — General Information 13

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 922­5026 (short, wide strips).

Cover nicks with EMI tape. Pay particular attention to the EMI shielding inside the rear housing,
shown below. The EMI shield is easily damaged when replacing modules.

•

iMac (20-inch Late 2006) Take Apart — General Information 14

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.

iMac (20-inch Late 2006) Take Apart — General Information 15

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 (20-inch Late 2006) Take Apart — General Information 16

What’s New

13 December 2007

Troubleshooting---> No Video--> Symptom 2: No Video, Boot Chime Heard, White LED ON: Step 4
was corrected to reference Step 7 instead of Step 8, which does not exist.

29 October 2007

A note was added to the Logic Board Replacement section to tell service providers to install the
iMac Firmware Update 1.2 (or later).

For proper performance and reliability of the Intel Core 2 Duo processors, apply the iMac •

rmware update after replacing the logic board. The rmware update allows Apple service

to consolidate the version 1 and version 2 logic boards.Refer to KBase article: Firmware

updates for Intel-based Macs.

The 661-4108 logic board will replaced by 661-4294•
The 661-4109 logic board will replaced by 661-4295•
The 661-4110 logic board will replaced by 661-4296•
The 661-4111 logic board will replaced by 661-4297•

16 October 2007

Corrected the Ambient Light Sensor part number on the Exploded View. diagram The correct •
part number is 922-7759.

23 April 2007

The • optical drive removal procedure has been updated. Using a screwdriver to release the
optical drive tabs is causing damage to the logic board. The updated procedure shows how
to remove the optical drive using a needlenose pliers.
Additional information on handling slot-load optical drives can be referenced in• Kbase

article 305282.

22 February 2007

Updated Upper Exploded View and created hyperlink to EEE code compatiblilty chart. •

16 February 2007

The AirPort Extreme Card and Logic Board sections in Take Apart have been updated with •
EEE code compatibility information. Before replacing either part, check for compatibility.

iMac (20-inch Late 2006) — What’s New 17

12 January 2007

The “• No Power” symptom in Troubleshooting has been updated. If your computer won’t
turn on, try removing and reinstalling the SO-DIMMs.

4 December 2006

Troubleshooting has been updated with a new symptom, “• Display does not remain in its

intended position when tilted.”

11 November 2006

A drawing of the clutch mechanism (922-7002) was added to the Exploded View drawing.•

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.

29 September 2006

The inverter procedure was updated; the DC cable connection to the inverter changed.•
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

6 September 2006

Product Introduction: iMac (20-inch Late 2006)•

Logic board: Intel Core 2 Duo processor running at 2.16 or 2.33 GHz•
AirPort Extreme and Bluetooth antennas: Two AirPort antennas, one Bluetooth antenna •

Inverter Board : New service part, 661-4112. It serves as the at panel backlight controller.•

Camera Board: New service module, 661-4113, is smaller than previous camera boards.•
Memory: Accepts up to a 2 GB SO-DIMM in each of the two memory slots, but the iMac •
will only support 3 GB total memory
Rear cover and front bezel: New part numbers (922-7769 and 922-7875) with slight •
revisions to each part
DC-DC Board: There is no DC/DC board. The functionality previously accomplished on •
the DC/DC board has been integrated into the logic board

iMac (20-inch Late 2006) — What’s New 18

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 19

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.

iMac (Early 2006 20-inch) Take Apart — Access Door 20

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 (20-inch Late 2006) Take Apart — Front Bezel 21

922-7011 (x3)

922-7749 (x1)

Removing the Front Bezel

Position unit on rear cover with the stand facing you.1.

2. Tilt up the front bezel and remove four screws along the bottom. The longer screw is the
second screw from the right. It’s to the left of the ambient light sensor.
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Modication in the General Information chapter if the
bezel is dicult to open.

iMac (20-inch Late 2006) Take Apart — Front Bezel 22

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.

iMac (20-inch Late 2006) Take Apart — Front Bezel 23

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.

iMac (20-inch Late 2006) Take Apart — Front Bezel 24

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.

iMac (20-inch Late 2006) Take Apart — Front Bezel 25

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 (20-inch Late 2006) Take Apart — Front Bezel 26

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.

iMac (20-inch Late 2006) Take Apart — Front Bezel 27

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 (20-inch Late 2006) Take Apart — Front Bezel 28

Camera Board

Tools

Black stick •
ESD mat, soft , clean towel or cloth•

Preliminary Steps

Before you begin, remove the access door and front bezel.

Part Location

iMac (20-inch Late 2006) Take Apart — Camera Board 29

Removing the Camera Board

The camera board and cables are visible as you lift the front bezel o the computer.1.

Remove any kapton tape on the cables. Disconnect the camera and microphone cables. 2.

Remove any kapton tape covering the camera board. With your ngernail or a black stick, 3.
gently lift/ip up the ex cable locking hinge to release the exible camera cable.

iMac (20-inch Late 2006) Take Apart — Camera Board 30

With your ngers or black stick, ex the two black tabs forward to release the camera board 4.
from the camera bracket.

Remove the camera board from the front bezel. 5. Note: The ex cable, camera lens, and black
mounting bracket are part of the front bezel.

iMac (20-inch Late 2006) Take Apart — Camera Board 31

Replacing the Camera Board

Position the camera board in the plastic bracket. Make sure the ex cable is not pinched as 1.
you install the board.

Snap the board into the mounting bracket and lock the ex cable into the connector with 2.
the locking hinge.

iMac (20-inch Late 2006) Take Apart — Camera Board 32

Reapply the tape across the length of the camera board. 3.

Connect the two cables to the camera board. 4.

Tuck the camera board cables neatly into the channel on the rear housing. 5.

iMac (20-inch Late 2006) Take Apart — Camera Board 33

Holding the memory ejector levers closed, lower the font bezel down.6.

Replace the bezel screws along the bottom of the computer.7.

Replace the access door; tighten the two captive screws.8.

iMac (20-inch Late 2006) Take Apart — Camera Board 34

Lower EMI Shield

Tools

Black stick (or other nonconductive nylon or plastic at-blade tool).•

Preliminary Steps

Before you begin, remove the following:

A• ccess door
F• ront bezel

Part Location

iMac (20-inch Late 2006) Take Apart — Lower EMI Shield 35

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 (20-inch Late 2006) Take Apart — Lower EMI Shield 36

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 before you replace the front 4.
bezel.

Replace the access door.5.

iMac (20-inch Late 2006) Take Apart — Lower EMI Shield 37

IR Board

Tools

Torx T6 screwdriver.•

Preliminary Steps

Before you begin, remove the following:

A• ccess door
F• ront bezel
Lower EMI shield•

Part Location

iMac (20-inch Late 2006) Take Apart — IR Board 38

922-7010

Removing the IR Board

1. Disconnect the IR cable and remove the two T6 screws on the IR board. Lift the IR board from
its mounting bracket.

922-7010

If necessary, 2. use a Torx T6 screwdriver to remove the IR board mounting bracket.

iMac (20-inch Late 2006) Take Apart — IR Board 39

Note3. : If you are replacing the IR /camera cable, you must remove the optical drive and
disconnect the cable from the logic board.

iMac (20-inch Late 2006) Take Apart — IR Board 40

Replacing the IR Board

If removed, route the IR/camera cable under the IR bracket. 1.

Install the IR board on the mounting bracket. Replace the T6 screws and connect the IR cable 2.
to the IR board.

iMac (20-inch Late 2006) Take Apart — IR Board 41

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 (20-inch Late 2006) Take Apart — IR Board 42

Battery

Tools

The only tool required for this procedure is a black stick.

Preliminary Steps

Before you begin, follow steps for removing the following:

A• ccess door
F• ront bezel
Lower EMI shiel• d

Part Location

iMac (20-inch Late 2006) Take Apart — Battery 43

Removing the Battery

With a black stick, pry the battery from the battery slot. 1.

Replacing the Battery

Slide the battery (with voltage information face up) into the battery holder. 1.

Replace the lower EMI shield.2.

Replace the front bezel.3.

Replace the access door.4.

iMac (20-inch Late 2006) Take Apart — Battery 44

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:

A• ccess door
F• ront bezel
Lower EMI shield•

Part Location

iMac (20-inch Late 2006) Take Apart — Display Panel 45

Removing the Display Panel

Using the access tool, a black stick, or your ngers, peel the black EMI tape o the right and 1.
left sides of the panel.

Using the access tool or black stick, peel back the black EMI tape stuck along the entire 2.
length of the top panel.

iMac (20-inch Late 2006) Take Apart — Display Panel 46

922-7010

3. Using a Torx T6 screwdriver, remove the two LVDS connector screws. Pull the black tab on the
connector to disconnect the LVDS cable from the logic board.

922-7023

4. Using a Torx T10 screwdriver, remove the four panel mounting screws.

iMac (20-inch Late 2006) Take Apart — Display Panel 47

Lift the panel up just enough to see the inverter cables on the left side. 5.

Disconnect the two panel-to-inverter cables above the left speaker. 6. Replacement Note: The
cable connectors are marked with dots to indicate “right-side-up.”

iMac (20-inch Late 2006) Take Apart — Display Panel 48

Raise the panel up the rest of the way. Disconnect the two inverter-to-display cables at the 7.
top of the inverter. Replacement Note: The cable connectors are marked with dots to
indicate “right-side up.”

Carefully separate the display from the sticky EMI shielding along the top of the display8. .

iMac (20-inch Late 2006) Take Apart — Display Panel 49

Note9. : If replacing the display panel, remove the lower EMI shield, the display panel mounting
brackets (on each side), and the LVDS cable from the back of the display panel before
returning the module to Apple.

iMac (20-inch Late 2006) Take Apart — Display Panel 50

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 (20-inch Late 2006) Take Apart — Display Panel 51

Memory

Tools

Phillips #2 screwdriver•
ESD mat, soft , clean towel or cloth•

Preliminary Steps

Before you begin, remove the access door.

Part Location

iMac (20-inch Late 2006) Take Apart — Memory 52

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 (20-inch Late 2006) Take Apart — Memory 53

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 (20-inch Late 2006) Take Apart — Memory 54

iMac (20-inch Late 2006) Take Apart — Memory 55

Speakers

Tools

Torx T10 screwdriver•

Preliminary Steps

Before you begin, remove the following:

A• ccess door
F• ront bezel
Lower EMI shield•
Display Pane• l
IR board•

Part Location

iMac (20-inch Late 2006) Take Apart — Speakers 56

922-7014 (Left)

922-7015 (Right)

Removing the Speakers

1. Using a T10 torx screwdriver, remove the screws from the left and right speakers.
Replacement Note: The longer of the two speaker mounting screws is used to secure the
left speaker; the shorter screw secures the right speaker.

922-7010

2. Remove the tow T6 screws on the IR mounting bracket so the speaker cable insulation is not
sliced on the metal bracket.

iMac (20-inch Late 2006) Take Apart — Speakers 57

If necessary, disconnect the hard drive cable (to the left of the IR bracket) from the logic 3.
board to allow easier removal of the speaker cable.

Note the speaker cable routing. The speaker wire runs below the heatsink and above the 4.
memory slot. Disconnect the speaker cable from the right side of the logic board.

Lift the speakers up and out of the computer. See the next photo for disconnecting the 5.
speaker.

iMac (20-inch Late 2006) Take Apart — Speakers 58

Replacing the Speakers

Connect the speaker cable to the logic board. 1.

Install the speakers and route the speaker below the heatsink and above the memory slot.2.

Replace the IR mounting bracket making sure the speaker cable runs under the bracket. 3.

Replace the IR board.4.

Secure the right speaker with the smaller of the two mounting screws.5.

Secure the left speaker with the longer of the two mounting screws. 6.

Replace the display panel.7.

Replace the lower EMI shield.8.

Replace the front bezel.9.

Replace the access door.10.

iMac (20-inch Late 2006) Take Apart — Speakers 59

AirPort Extreme Card

Tools

Torx T6 screwdriver•

Preliminary Steps

Before you begin, remove the following:

A• ccess door
F• ront bezel
Lower EMI shiel• d

Part Location

iMac (20-inch Late 2006) Take Apart — AirPort Extreme Card 60

922-7010

Removing the AirPort Extreme Card

1. Disconnect the two AirPort antennas and remove the two T6 screws.

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 (20-inch Late 2006) Take Apart — AirPort Extreme Card 61

Replacing the AirPort Extreme Card

See the following section on compatibility to order the replacement part by EEE code.1.

Align the AirPort Extreme card with the slot on the logic board. Insert the board into the slot.2.

Replace the two T6 AirPort Extreme card screws.3.

Connect the antenna cables to the AirPort Extreme card.4.

Replace the lower EMI shield.5.

Replace the front bezel.6.

Replace the access door.7.

Checking Compatibility between AirPort Card and Logic Board

The iMac (Late 2006) computers were built with a number of logic boards and AirPort Extreme
cards. To avoid confusion identifying the correct logic board and AirPort Extreme card for the
system, refer to the table in this section which lists the corresponding EEE codes.

Locating the EEE Code

To locate the EEE code on the AirPort Extreme card, remove the card from the logic board. Turn
the card over, and look for the representative EEE code within the card’s serial number. Locate the
last four digits in the serial number. Drop the last digit (in this case, the letter “A”). The EEE code is
the next three digits. In this case it’s “VZL”, shown below.

iMac (20-inch Late 2006) Take Apart — AirPort Extreme Card 62

To locate the EEE code on the logic board, locate the memory slot inside the computer. Locate
the last four digits in the serial number. Drop the last digit, in this case, the letter “A.” The EEE code
is the next three digits. In this case the EEE code is “WZH.”

EEE Code Table

Use the table below to identify the logic board and AirPort Extreme card EEE codes for the iMac
system. Order the correct service part based upon the corresponding EEE code. The table is
available in Knowledge Base article 305112-iMac(Late2006):AirPortCardDierences.

iMac Model Logic Board

Part #

iMac (20-inch Late

2006)

iMac (20-inch Late

2006)

661-4108,
Board , Logic,

2.16 GHz, 128

661-4109,
Board , Logic,

2.33 GHz, 128

Logic Board
EEE Code

VRG

VVA

WZF

WZH

W51

W53

WZK

WZM

AirPort
Extreme Card
Part #

661-4060,
B661-4060,
J661-4060,
KH661-4060,
PA661-4060,
Z661-4060

661-4060,
B661-4060,
J661-4060,
KH661-4060,
PA661-4060,
Z661-4060

AirPort
Extreme Card
EEE Code

VZL
VZM
VZN
VZR
VZP
VZQ

VZL
VZM
VZN
VZR
VZP
VZQ

iMac (20-inch Late 2006) Take Apart — AirPort Extreme Card 63

iMac Model Logic Board

Part #

Logic Board
EEE Code

AirPort
Extreme Card
Part #

AirPort
Extreme Card
EEE Code

iMac (20-inch Late

2006)

iMac (20-inch Late

2006)

iMac (20-inch Late

2006)

iMac (20-inch Late

2006)

iMac (20-inch Late
2006

iMac (20-inch Late
2006

661-4110,
Board , Logic,

2.16 GHz, 256

661-4111,
Board , Logic,

2.33 GHz, 256

661-4294,
Board , Logic,

2.16 GHz, 128

661-4295,
Board , Logic,

2.33 GHz, 128

661-4296,
Board , Logic,

2.16 GHz, 256

661-4297,
Board , Logic,

2.33 GHz, 256

VV9

VVB

WZG

WZJ

W52,

W54

WZL

WZN

XYD

XYE

XYH

XYJ

XYF

XYG

XZM

XZN

661-4060,
B661-4060,
J661-4060,
KH661-4060,
PA661-4060,
Z661-4060

661-4060,
B661-4060,
J661-4060,
KH661-4060,
PA661-4060,
Z661-4060

661-4289,
B661-4289,
J661-4289,
KH661-4289,
PA661-4289,
Z661-4289

661-4289,
B661-4289,
J661-4289,
KH661-4289,
PA661-4289,
Z661-4289

661-4289,
B661-4289,
J661-4289,
KH661-4289,
PA661-4289,
Z661-4289

661-4289,
B661-4289,
J661-4289,
KH661-4289,
PA661-4289,
Z661-4289

VZL
VZM
VZN
VZR
VZP
VZQ

VZL
VZM
VZN
VZR
VZP
VZQ

WQX
WQY
WQZ
WR2
WR0
WR1

WQX
WQY
WQZ
WR2
WR0
WR1

WQX
WQY
WQZ
WR2
WR0
WR1

WQX
WQY
WQZ
WR2
WR0
WR1

iMac (20-inch Late 2006) Take Apart — AirPort Extreme Card 64

Bluetooth Card

Tools

Torx T6 screwdriver•

Preliminary Steps

Before you begin, remove the following:

A• ccess door
F• ront bezel
Lower EMI shiel• d
Speaker• s

Part Location

iMac (20-inch Late 2006) Take Apart — Bluetooth Board 65

922-7010

Removing the Bluetooth Board

1. Using a T6 torx screwdriver, remove the two screws on the Bluetooth board and disconnect
the antenna from the card.

Lift the card o the logic board. 2.

iMac (20-inch Late 2006) Take Apart — Bluetooth Board 66

Replacing the Bluetooth Board

Press the Bluetooth board onto the logic board connector. 1.

Connect the Bluetooth antenna to the Bluetooth board. 2. Note: Make sure the card and
antenna are securely connected before installing the speakers.

Replace the two T6 Bluetooth board 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 (20-inch Late 2006) Take Apart — Bluetooth Board 67

Optical Drive

Tools

Torx T10 screwdriver•
Torx T6 screwdriver•
Needlenose pliers (with teeth)•

Preliminary Steps

Before you begin, remove the following:

A• ccess door
F• ront bezel
Lower EMI shield•
Display Pane• l

Part Location

iMac (20-inch Late 2006) Take Apart — Optical Drive 68

922-7817

Removing the Optical Drive

1. Remove the two T6 wafer head screws from 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.

Note2. : Make sure to use a needlenose pliers with teeth to remove the optical drive. The pliers
must have a textured surface to properly grasp the optical drive release tabs.

iMac (20-inch Late 2006) Take Apart — Optical Drive 69

Locate the black tabs at each side of the plastic optical drive mounting bracket. Starting at 3.
the release tab that is furthest from the logic board, grasp the tab with needlenose pliers,

and ex the tab toward the optical drive exible cable. Use one nger underneath the edge

of the optical drive to gently lift up that corner of the drive.

Warning: iMac main logic boards returned with physical damage such as scratches, fractures,

or broken or missing components caused by improper servicing may be classied as

customer abuse. When using a tool to release the latches, be careful not to apply pressure to
the logic board or it may be damaged.

iMac (20-inch Late 2006) Take Apart — Optical Drive 70

While avoiding the logic board, grasp the tab with needlenose pliers, and ex the tab toward 4.
the optical drive. Use one nger underneath the rear edge of the optical drive to gently tilt

up the end of the drive and remove the optical drive out of the housing.

iMac (20-inch Late 2006) Take Apart — Optical Drive 71

This photo shows the optical drive out of the computer so you can visualize how the clips 5.
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.

6. If replacing the optical drive, use a T6 torx screwdriver to remove two ex cable screws
attaching to the optical drive. Note: Disconnect the ex cable and transfer it to the
replacement drive. Go on to the next step.

922-7817

iMac (20-inch Late 2006) Take Apart — Optical Drive 72

If replacing the optical drive, disconnect the sensor cable from the optical sensor located on 7.
the underside of the optical drive. Transfer the sensor cable to the replacement drive.

iMac (20-inch Late 2006) Take Apart — Optical Drive 73

922-7817

Replacing the Optical Drive

1. Install the ex cable to the optical drive with two T6 screws.

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.

iMac (20-inch Late 2006) Take Apart — Optical Drive 74

Connect the optical sensor cable to the logic board. Route the sensor cable under the optical 3.
ex cable. Connect the ex cable to the logic board and replace the T6 screws.

Replace the display panel.4.

Replace the lower EMI shield.5.

Replace the front bezel.6.

Replace the access door.7.

iMac (20-inch Late 2006) Take Apart — Optical Drive 75

Hard Drive

Tools

Torx T10 screwdriver•

Preliminary Steps

Before you begin, remove the following:

A• ccess door
F• ront bezel
Lower EMI shield•
Display Pane• l

Part Location

iMac (20-inch Late 2006) Take Apart — Hard Drive 76

922-6800

Removing the Hard Drive

1. Remove the two T10 screws attaching the hard drive to the DC/DC inverter board

Disconnect the hard drive sensor cable from the connector on the logic board. Note 2. the
location of the sensor on the side of the hard drive and the routing of the sensor cable
under the heat pipes.

iMac (20-inch Late 2006) Take Apart — Hard Drive 77

Holding the drive by the metal bracket, pull the hard drive toward the inverter and then up 3.
to release the hard drive mounting pins from the grommets on the chassis.

Disconnect the hard drive power and data cables from the end of the hard drive. 4.

iMac (20-inch Late 2006) Take Apart — Hard Drive 78

922-7001

5. If you are replacing the hard drive, transfer the temperature sensor, mounting pins, and the
metal mounting bracket to the replacement drive.

iMac (20-inch Late 2006) Take Apart — Hard Drive 79

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.

iMac (20-inch Late 2006) Take Apart — Hard Drive 80

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.

iMac (20-inch Late 2006) Take Apart — Hard Drive 81

Secure the two T10 screws on the hard drive mounting bracket to the 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 (20-inch Late 2006) Take Apart — Hard Drive 82

Power Supply

Tools

Torx T10 screwdriver•

Preliminary Steps

Before you begin, remove the following:

A• ccess door
F• ront bezel
Lower EMI shield•
Display Pane• l
Hard driv• e
Logic boar• d

Part Location

iMac (20-inch Late 2006) Take Apart —Power Supply, AC/DC 83

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 (20-inch Late 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.

1. Using a torx screwdriver, remove three self-tapping screws and one machine screw (bottom
right corner) on the power supply board. The top left screw also connects a ground cable to
the chassis; leave it attached to the chassis. Replacement Note: Install the machine screw
rst when installing the power supply.

922-7159 (x3)

922-6842

iMac (20-inch Late 2006) Take Apart —Power Supply, AC/DC 84

Disconnect the two cables; the inverter cable on the left and the AC-DC power supply to AC 2.
power inlet cable on the right. The AC cable is 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 (20-inch Late 2006) Take Apart —Power Supply, AC/DC 85

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 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.

iMac (20-inch Late 2006) Take Apart —Power Supply, AC/DC 86

Connect the AC-DC power supply cable to the inverter on the left. Reconnect the power 1.
supply to AC power inlet cable. Tuck the AC power inlet cable under the metal chassis.

Replace the four power supply screws. Install the machine screw (bottom right corner) rst 2.
when installing the power supply.

Replace the hard drive.3.

iMac (20-inch Late 2006) Take Apart —Power Supply, AC/DC 87

Replace the logic board.4.

Replace the display panel.5.

Replace the lower EMI shield.6.

Replace the front bezel.7.

Replace the access door.8.

Replace the display panel.9.

Replace the lower EMI shield.10.

Replace the front bezel.11.

Replace the access door.12.

iMac (20-inch Late 2006) Take Apart —Power Supply, AC/DC 88

Logic Board

Tools

Torx T10 screwdriver•
Torx T6 screwdriver•

Preliminary Steps

Before you begin, remove the following:

A• ccess door
F• ront bezel
Lower EMI shield•
Display Pane• l
Optical Driv• e
Disconn• ect the IR board
Disco• nnect the AirPort antennas
Disconnect the Bluetooth antenn• a

Part Location

iMac (20-inch Late 2006) Take Apart —Logic Board 89

Removing the Logic Board

Disconnect the eight cables from the connectors on the logic board. 1.

922-???? (extra
long screw)

922-6800

922-6842

2. Remove seven T10 screws. Screws are labeled below as self-tapping or machine screws.-

iMac (20-inch Late 2006) Take Apart —Logic Board 90

922-7817

3. At the top of the heatsink, remove the two T6 screws that attach the logic board support
brackets (clips) to the chassis. Note: The L–shaped support brackets must be removed and
transferred to the heatsink on the replacement logic board.

Holding the board on each side, lift it up and toward the top of the computer. 4. Note: Remove
the memory module from the slot before returning the board to Apple

iMac (20-inch Late 2006) Take Apart —Logic Board 91

Replacing the Logic Board

Replacement Note: iMac Firmware Update 1.2 (or later) Required

For proper performance and reliability of the Intel Core 2 Duo processors, apply the iMac

rmware update after replacing the logic board. Refer to KBase article: Firmware updates for

Intel-based Macs.

See the following section on 1. compatibility to order the replacement part by EEE code.

Position all the logic board cables out of the way so the logic board can be placed into the 2.
rear housing.

As you lower the board into the rear housing, make sure the memory levers are lowered 3.
through the access door opening and the logic board screw holes line up with the board.

At the top of the heatsink, re4. place the two T6 screws attaching the logic board support
bracket to the chassis. Note: The L–shaped support brackets must be transferred to the
replacement logic board.

iMac (20-inch Late 2006) Take Apart —Logic Board 92

Make sure the hard drive sensor and the sensor cable are attached to the side of the hard 5.
drive. Route the sensor cable under the chassis and connect it to the logic board.

Connect the optical drive sensor cable, optical ex cable, optical clip, and replace the optical 6.
clip screws.

iMac (20-inch Late 2006) Take Apart —Logic Board 93

Using a T10 torx screwdriver, replace the seven screws on the board. Always install the 7.
machine screws before installing the self-tapping screws.

iMac (20-inch Late 2006) Take Apart —Logic Board 94

Connect the cables to the connectors on the logic board. 8.

Connect the AirPort and Bluetooth antennas.9.

Replace the speakers.10.

Replace the IR board and connect the IR cable.11.

Replace the display panel.12.

Replace the lower EMI shield.13 .

Replace the front bezel.14.

Replace the memory access door.15 .

Checking Compatibility between Logic Board and AirPort Card

The iMac (Late 2006) computers were built with a number of logic boards and AirPort Extreme
cards. To avoid confusion identifying the correct logic board and AirPort Extreme card for the
system, refer to the table in this section which lists the corresponding EEE codes.

Locating the EEE Code

To locate the EEE code on the AirPort Extreme card, remove the card from the logic board. Turn
the card over, and look for the representative EEE code within the card’s serial number. Locate the
last four digits in the serial number. Drop the last digit (in this case, the letter “A”). The EEE code is
the next three digits. In this case it’s “VZL”, shown below.

iMac (20-inch Late 2006) Take Apart —Logic Board 95

To locate the EEE code on the logic board, locate the memory slot inside the computer. Locate
the last four digits in the serial number. Drop the last digit, in this case, the letter “A.” The EEE code
is the next three digits. In this case the EEE code is “WZH.”

iMac (20-inch Late 2006) Take Apart —Logic Board 96

EEE Code Table

Use the table below to identify the logic board and AirPort Extreme card EEE codes for the iMac
system. Order the correct service part based upon the corresponding EEE code. The table is
available in Knowledge Base article 305112-iMac(Late2006):AirPortCardDierences.

iMac Model Logic Board

Part #

iMac (20-inch Late

2006)

iMac (20-inch Late

2006)

iMac (20-inch Late

2006)

iMac (20-inch Late

2006)

iMac (20-inch Late

2006)

661-4108,
Board , Logic,

2.16 GHz, 128

661-4109,
Board , Logic,

2.33 GHz, 128

661-4110,
Board , Logic,

2.16 GHz, 256

661-4111,
Board , Logic,

2.33 GHz, 256

661-4294,
Board , Logic,

2.16 GHz, 128

Logic Board
EEE Code

VRG

VVA

WZF

WZH

W51

W53

WZK

WZM

VV9

VVB

WZG

WZJ

W52

W54

WZL

WZN

XYD

XYE

AirPort
Extreme Card
Part #

661-4060,
B661-4060,
J661-4060,
KH661-4060,
PA661-4060,
Z661-4060

661-4060,
B661-4060,
J661-4060,
KH661-4060,
PA661-4060,
Z661-4060

661-4060,
B661-4060,
J661-4060,
KH661-4060,
PA661-4060,
Z661-4060

661-4060,
B661-4060,
J661-4060,
KH661-4060,
PA661-4060,
Z661-4060

661-4289,
B661-4289,
J661-4289,
KH661-4289,
PA661-4289,
Z661-4289

AirPort
Extreme Card
EEE Code

VZL
VZM
VZN
VZR
VZP
VZQ

VZL
VZM
VZN
VZR
VZP
VZQ

VZL
VZM
VZN
VZR
VZP
VZQ

VZL
VZM
VZN
VZR
VZP
VZQ

WQX
WQY
WQZ
WR2
WR0
WR1

iMac (20-inch Late 2006) Take Apart —Logic Board 97

iMac Model Logic Board

Part #

Logic Board
EEE Code

AirPort
Extreme Card
Part #

AirPort
Extreme Card
EEE Code

iMac (20-inch Late

2006)

iMac (20-inch Late
2006

iMac (20-inch Late
2006

661-4295,
Board , Logic,

2.33 GHz, 128

661-4296,
Board , Logic,

2.16 GHz, 256

661-4297,
Board , Logic,

2.33 GHz, 256

XYH

XYJ

XYF

XYG

XZM

XZN

661-4289,
B661-4289,
J661-4289,
KH661-4289,
PA661-4289,
Z661-4289

661-4289,
B661-4289,
J661-4289,
KH661-4289,
PA661-4289,
Z661-4289

661-4289,
B661-4289,
J661-4289,
KH661-4289,
PA661-4289,
Z661-4289

WQX
WQY
WQZ
WR2
WR0
WR1

WQX
WQY
WQZ
WR2
WR0
WR1

WQX
WQY
WQZ
WR2
WR0
WR1

iMac (20-inch Late 2006) Take Apart —Logic Board 98

AC Power Inlet

Tools

Torx T10 screwdriver•

Preliminary Steps

Before you begin, remove the following:

A• ccess door
F• ront bezel
Lower EMI shield•
Display Pane• l
Sp• eakers
Hard driv• e
Logic boar• d
CPU Fa• n

Part Location

iMac (20-inch Late 2006) Take Apart —AC Power Inlet 99

922-6800

922-7069 (x1)

Removing the AC Line Filter

1. Using a torx T10 screwdriver, remove the three self-tapping screws from the power inlet and

the machine screw from the ground cable . Remove the EMI tape on the lter.

Disconnect the AC lter cable from the power supply. Notice the routing of the AC lter 2.

cable under the chassis.

Lift the AC lter out of the rear housing. 3.

iMac (20-inch Late 2006) Take Apart —AC Power Inlet 100