Apple imac-20 Service Manual
Service Source
iMac (20-inch Mid 2007)
August 2007
© 2007 Apple Inc. All rights reserved.
iMac (20-inch Mid 2007)
Contents
Take Apart
General Information 6
Product View 6
Opening the Computer 6
Note About Images in This Manual 6
Serial Number Location 7
General Tools 8
Required Special Tools 8
Removing the Glass Panel 9
View Under the LCD Panel 9
View of the Main Modules 10
View of the Rear Housing and Cables 10
Cleaning and Handling the Glass Panel 11
Handling a Broken Glass Panel 12
Safety 13
EMI Shielding 14
Access Door 15
Memory 17
Glass Panel 21
Cleaning and Handling of the Glass Panel 22
Removing the Glass Panel 24
Replacing the Glass Panel 27
Installing a Replacement Glass Panel 32
Front Bezel 37
Camera Board 44
Battery 48
IR (Infrared) Board 51
Ambient Temperature Sensor Cable 54
Ambient Temperature Sensor 57
ii
AirPort Extreme Card 60
Bluetooth Card 63
LCD Display Panel 66
LCD Temp Sensor Cable 74
LVDS Cable 81
Speaker, Right 86
Speaker, Left 89
Optical Drive Fan 94
CPU Fan 97
Power Supply, AC/DC 100
Hard Drive 106
Hard Drive Sensor Cable 112
Optical Drive 115
Optical Drive Flex Cable 120
Optical Sensor Cable 123
Logic Board 126
Video Card 135
Inverter 140
Hard Drive Fan 146
AC Power Inlet 149
Audio Board 157
Camera Cable 160
Microphone Cable 165
Hard Drive Data Cable 170
Mechanism Cover 173
Clutch Mechanism 176
DC Power Cable 181
iii
Rear Cover 188
Stand 191
Chassis 195
Troubleshooting
General Information 201
Serial Number 201
Power On Self Test (POST) 202
DDR Memory 202
Diagnostic LEDs 204
Symptom Charts 206
Power Issues 207
No Video 208
Display 212
Hard Drive 213
Optical Drive 215
Fan Sound 220
AirPort 224
Bluetooth 225
IR Remote 226
IR Sensor/Receiver 227
Built-in iSight Camera 228
Speakers 230
Mouse 231
Keyboard 232
Error Beep(s) 234
USB 234
Views
iMac (20-inch Mid 2007)—Upper Exploded View 236
iMac (20-inch Mid 2007)—Lower Exploded View 237
Screw Chart (in Progress!) 238
iv
Service Source
Take Apart
iMac (20-inch Mid 2007)
© 2007 Apple Inc. All rights reserved.
Product View
General Information
Opening the Computer
Important: The glass panel on the iMac should only be removed by Apple authorized
technicians. Removing the glass panel requires special tools and must be done prior to
replacing any module other than the SO-DIMMs. Be sure to read and follow all of the handling
and cleaning recommendations to prevent damaging the LCD panel. Be sure to follow ESD
precautions when the front bezel and the LCD display are removed.
Note About Images in This Manual
Small dierences in appearance between the images pictured and the actual computer you are
servicing may exist, however the steps and sequence are the same unless otherwise noted.
iMac (20-inch Mid 2007) 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.
This label also provides the computer conguration and an “EMC” number (EMC No.).
To conrm the conguration from the Apple menu, choose About This Mac. The Processor listing
will show the speed of the processor followed by the processor type.
The iMac (20-inch, Mid 2007) has several features that distinguish it from earlier iMac models:
2.0 GHz Intel Core 2 Duo processor •
ATI Radeon HD 2400 XT with 128 MB GDRR3 VRAM•
20-inch widescreen at panel display (1680x1050 native resolution)•
250 GB hard disk (CTO options : 320 GB or 500 GB)•
1 GB (1x 1GB) 667 MHz with support up to 4 GB system memory•
Built-in stereo speakers with internal 24-watt digital amplier•
New Apple keyboard, wired (CTO option: new Apple keyboard, wireless) •
iMac (20-inch Mid 2007) Take Apart — General Information 7
General Tools
The following tools are required to service the computer:
ESD-safe workstation and mat•
Soft, clean towel or cloth (to protect the display and removed parts from scratches)•
Black stick (or other nonconductive nylon or plastic at-blade tool)•
Phillips #1 screwdriver•
Phillips #2 screwdriver•
Torx T6 screwdriver (magnetized)•
Torx T8 screwdriver (magnetized)•
Torx T10 screwdriver (magnetized)•
Flat-blade screwdriver•
ESD bags•
Required Special Tools
Special tools are required to remove, handle, and clean the glass panel such as the following.
View the tools in the Glass Panel take apart chapter.
922-8252 Suction cups, Pkg. of 2 1.
922-8261 Sticky silicon roller (6-inch) to clean the glass panel 2.
922-8262 Sticky sheet pads to clean the silicon roller 3.
922-8263 Polishing cloths, clean, anti-static, optical grade micro ber “terry” style cloth4.
922-8253 Gloves, lint-free, anti-static, Pkg. of 2 5.
922-8259 Microfoam bag to store the glass panel, Pkg. of 56.
922-8258 ESD bags, 24x20, Pkg. of 5, to store the LCD panel. 7. Note: To prevent the buildup
of static charges which may attract dust particles to the surface of the display, store the LCD
panel in an anti-static bag whenever it has been removed from the system.
iKlear Apple Polish or Brillianize anti-static spray cleaning solution. A list of where iKlear/8.
Brillianize can be obtained is listed in the Glass Panel chapter of the service manuals.
iMac (20-inch Mid 2007) Take Apart — General Information 8
Removing the Glass Panel
View Under the LCD Panel
Note: To prevent the buildup of static charges which may attract dust particles to the surface
of the display, store the LCD panel in an anti-static bag whenever it has been removed from the
system.
iMac (20-inch Mid 2007) Take Apart — General Information 9
View of the Main Modules
View of the Rear Housing and Cables
iMac (20-inch Mid 2007) Take Apart — General Information 10
Click on photo--->>
Cleaning and Handling the Glass Panel
The iMac (20-inch Mid 2007) model has a glass panel that attaches to the outside of the front
bezel. The glass panel is not tempered and will break into sharp pieces if mishandled. A scratched
or broken glass panel is not covered under warranty. To prevent contamination, the glass panel
must only be handled by the edges while wearing lint-free gloves. Removing the glass panel
requires special tools and must be done prior to replacing any module other than the SO-DIMM’s.
Special tools such as lint-free gloves, rubber suction cups, a sticky silicon roller, microfoam storage
bags, and the iKlear cleaning solution are required to remove, handle, and clean the glass panel.
The complete list of tools and resources can be found in the Glass Panel take apart chapter.
DO
Handle glass panel using lint free gloves.•
Use only a sticky silicon roller to clean the inside surface of the glass and the LCD panel.•
Use iKlear to clean • ONLY the outside surface of the glass panel.
Place the glass panel into a clean protective microfoam bag when it is not installed on an •
iMac.
Store the glass panel in a safe area where it will not be broken or damaged.•
Store the LCD panel in an anti-static bag to prevent the buildup of static charges which may •
attract dust particles to the display’s surface.
DO NOT
Touch the inside of the glass with bare hands or dirty gloves. Fingerprints will be dicult to •
remove.
Clean the inside surface of the glass or the LCD with iKlear or other cleaning solutions.•
Place the glass panel onto a work surface where it may collect dust and other contaminants •
unless it has rst been placed into its protective microfoam bag.
Use single wipe iKlear packets or other cleaning solutions to clean the glass..•
iMac (20-inch Mid 2007) Take Apart — General Information 11
Handling a Broken Glass Panel
The glass panel is not tempered and will break into sharp pieces if mishandled.
If the glass is broken it must be carefully removed from the iMac to prevent irreparable damage
to the front surface of the LCD. If the front surface of the LCD is scratched by the broken glass the
LCD may need to be replaced.
Do not handle broken glass unless you are wearing protective cut-resistant gloves. The lint-free
gloves used to prevent contamination of the glass panel are not suitable for handling broken
glass.
Use a broom and dust pan to sweep up as much of the broken glass as possible. Glass fragments
may have travelled several feet from the location of the glass panel so be sure to thoroughly
clean the entire area. Use a vacuum to remove the smaller fragments not picked up by the
broom.
iMac (20-inch Mid 2007) Take Apart — General Information 12
Safety
WARNING: HIGH VOLTAGE: The highlighted module below is an AC/DC power supply that
poses a shock hazard. When the computer 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. A white, shock- hazard
warning symbol is silk-screened in the middle of the power supply module.
WARNING:
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.
Disconnect ESD wrist straps when working on a plugged in system. •
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 • computer 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 Mid 2007) Take Apart — General Information 13
EMI Shielding
The rear cover of the computer 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 that can be ordered from Apple service.
iMac (20-inch Mid 2007) Take Apart — General Information 14
Access Door
Tools
Phillips #2 screwdriver•
ESD-safe workstation and mat•
Soft , clean towel or cloth•
Preliminary Steps
Before you begin, place the computer face down on a clean, soft, lint-free cloth so that the
bottom is facing you.
Part Location
iMac (20-inch Mid 2007) Take Apart — Access Door 15
Removing the Access Door
Disconnect all cables and the power cord from your iMac.1.
Place a soft, clean towel or cloth on your work surface. Hold the side of the iMac and lay it 2.
down so that the screen is against the surface and the bottom is facing you.
Raise the stand and use a Phillips #2 screwdriver to loosen the captive screw on the memory 3.
access door by turning it counterclockwise.
Remove the access door.4.
Replacing the Access Door
Place a soft, clean towel or cloth on your work surface. Hold the sides of the iMac and lay it 1.
down so that the screen is against the surface and the bottom is facing you.
Replace the memory access door using a Phillips #2 screwdriver to tighten the screw.2.
Important3. : To ensure proper cooling the iMac should not be operated without the memory
access door installed.
iMac (20-inch Mid 2007) Take Apart — Access Door 16
Memory
This computer comes with a minimum of 1GB of 667 MHz PC2-5300 Double Data Rate 2 (DDR2)
Small Outline Dual Inline Memory Modules (SO-DIMMs). It has two slots that can accept DIMMs. A
1 GB, or 2 GB memory module may be installed for a maximum of 4 GB of memory.
Tools
ESD mat •
Soft , clean towel or cloth•
Preliminary Steps
Before you begin, remove the access door.
Warning: Always shut down the computer and remove the power cord before installing memory.
Do not attempt to install memory in the computer while it is plugged in.
Part Location
iMac (20-inch Mid 2007) Take Apart — Memory 17
Removing the Memory
Shut down the computer, and disconnect all cables including the power cord.1.
Holding the sides of the computer, lay it face down on a soft, clean cloth so the stand is 2.
facing you.
After removing the access door, touch the metal stand or bezel to discharge any static 3.
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.
iMac (20-inch Mid 2007) Take Apart — Memory 18
Untuck the tab in the memory compartment. Pull it to eject the installed memory module.4.
Set the memory modules in an anti-static bag and set them aside.5.
iMac (20-inch Mid 2007) Take Apart — Memory 19
Replacing the Memory
With the computer face down, orient the notch on the DIMM with the notch in the memory 1.
slot. In this case, the notch is on the left.
With your ngers, press the DIMM fully into the slot until you hear a click. Repeat for the 2.
other DIMM slot.
Fold the black tab over each DIMM. 3.
Replace the memory access door.4.
Use a Phillips #2 screwdriver to tighten the captive screw on the memory access door.5.
Make sure the computer recognizes the new memory by opening System Proler, clicking 6.
More Info, and clicking Memory.
iMac (20-inch Mid 2007) Take Apart — Memory 20
Glass Panel
Tools
This procedure requires the following tools:
Suction cups (922-8252)•
Sticky silicon roller (6-inch) to clean the glass panel (922-8261)•
Sticky sheets to clean the silicon roller (922-8262)•
Polishing cloths, clean, anti-static, optical grade micro ber “terry” style cloth (922-8263)•
iKlear Apple Polish or Brillianize anti-static spray cleaning solution •
Gloves, lint-free, anti-static (922-8253)•
Microfoam bag to store the glass panel (922-8259) •
ESD bag for LCD display storage (922-8258)•
Note: Tools without part numbers can be sourced directly from the vendor. Refer to “Cleaning
Tool Resources” at the end of this chapter.
Part Location
iMac (20-inch Mid 2007) Take Apart — Glass Panel 21
Click on photo--->>
Cleaning and Handling of the Glass Panel
The iMac (20-inch Mid 2007) model has a glass panel that attaches to the outside of the front
bezel. The glass panel is not tempered and will break into sharp pieces if mishandled. A scratched
or broken glass panel is not covered under warranty. To prevent contamination the glass panel
must only be handled by the edges while wearing lint-free gloves. Removing the glass panel
requires special tools and must be done prior to replacing any module other than the SO-DIMM’s.
Special tools such as lint-free gloves, rubber suction cups, a sticky silicon roller, microfoam storage
bags, and the iKlear cleaning solution are required to remove, handle, and clean the glass panel.
DO
Handle glass panel using lint free gloves.•
Use only a sticky silicon roller to clean the inside surface of the glass and the LCD panel.•
Use iKlear to clean • ONLY the outside surface of the glass panel.
Place the glass panel into a clean protective microfoam bag when it is not installed on an •
iMac.
Store the glass panel in a safe area where it will not be broken or damaged.•
DO NOT
Touch the inside of the glass with bare hands or dirty gloves. Fingerprints will be very •
dicult to remove.
Clean the inside surface of the glass or the LCD with iKlear or other cleaning solutions.•
Place the glass panel onto a work surface where it may collect dust and other contaminants •
unless it has rst been placed into its protective microfoam bag.
Use single wipe iKlear packets or other cleaning solutions to clean the glass.•
iMac (20-inch Mid 2007) Take Apart — Glass Panel 22
Metal Alignment Pins on the Glass Panel
There are alignment pins at the top of the glass panel near the camera, one pin at the bottom
near the IR remote sensor, and a pin on the left and right side of the glass. Important: If the glass
is removed from the bezel at an angle, the metal alignment pins may bend, causing scratches on
the inside of the glass and possibly requiring replacement of the glass panel.
Magnets on the Front Bezel
The glass panel has a thin silver ferrous metal band axed to the perimeter which is magnetically
attracted to the fourteen magnets (circled below) which are attached to the front bezel. These
magnets hold the glass panel in place. Suction cups are used to pull the glass panel away from
the magnets on the front bezel. .
iMac (20-inch Mid 2007) Take Apart — Glass Panel 23
Removing the Glass Panel
Apple 1. strongly recommends wearing clean lint-free gloves whenever handling the glass
panel. The gloves protect the glass panel from body oils, dirt, and other contaminants. Put on
a pair of clean gloves with the rubberized-side of the gloves on the palm side of your hand.
Position the computer on the rear cover, on a soft protective lint-free surface, with the stand 2.
facing you
Clean o the suction cups, making sure they are free of contaminants. It may be necessary to 3.
wash the suction cups with a mild liquid soap in order to remove the residual release agents
applied during manufacturing.
iMac (20-inch Mid 2007) Take Apart — Glass Panel 24
Click on photo--->>
4. Gently press the suction cups in opposite corners on the glass panel, as shown. Important:
Make sure the suction cups are rmly attached to the glass before lifting the glass.
Hold onto the suction cups and gently lift the glass panel 5. straight up and o the bezel.
Set the glass down on the microfoam bag or clean lint-free surface and remove the suction 6.
cups. Squeeze the base of each suction cup to release them from the glass panel.
iMac (20-inch Mid 2007) Take Apart — Glass Panel 25
Touching only the edges of the glass, slide the glass panel into the microfoam static-free 7.
bag. Set the glass aside in a location where it won’t get damaged. The bag will help minimize
contamination of the glass.
iMac (20-inch Mid 2007) Take Apart — Glass Panel 26
Replacing the Glass Panel
Put on a pair of clean gloves with the rubberized-side of the gloves on the palm side of your 1.
hand.
Install the LCD display panel onto the computer if it was removed.2.
Replace the font bezel if it was removed, connect the microphone cable and replace the 3.
bezel screws.
Locate the sticky silicon roller (a dierent model roller is shown in the procedure) and 4.
the dust removal pad. Remove the protective covering on the silicon roller and peel the
protective cover o the dust removal pad.
iMac (20-inch Mid 2007) Take Apart — Glass Panel 27
Holding the sticky paper with your free hand, clean the silicon roller on the sticky paper by 5.
rolling the roller back and forth once or twice on the sticky paper. If the sticky paper has
been used multiple times and looks dirty, use a new piece of sticky paper.
Set the roller aside on its clean protective cover while you prepare the glass and computer.6.
iMac (20-inch Mid 2007) Take Apart — Glass Panel 28
REMINDER: WEAR CLEAN GLOVES AND ONLY HANDLE THE GLASS BY THE EDGES.7.
Stand the computer upright. 8. Note: Less dust particles will settle on the LCD panel with the
computer in the vertical position.
Roll the sticky silicon roller over the LCD panel to remove any particles. 9. Note: A larger silicon
roller was used for demonstration purposes, however; the 6-inch silicon roller from Apple
service will suce.
Remove the glass panel from the microfoam bag. Place the glass on the bag with the inside 10.
surface of the glass (side with metal pins) facing up.
iMac (20-inch Mid 2007) Take Apart — Glass Panel 29
Clean the 11. INSIDE of the glass panel with the clean silicon roller. Gently roll the clean silicon
roller over the inside of the glass. Note: The glass panel is delicate and will break if too
much pressure is applied.
Holding the glass by the edges, carefully line up the metal pins on the inside of the glass 12.
panel with the holes at the top of the front bezel and the hole at the bottom of the bezel.
Gently lower the glass panel onto the bezel. The magnets on the front bezel will pull panel
and hold the glass panel in place.
iMac (20-inch Mid 2007) Take Apart — Glass Panel 30
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