Service Source
Updated 29 October 2007
© 2006 Apple Inc. All rights reserved.
iMac (24-inch)
Take Apart
General Information 6
What’s New |
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29 October 2007 |
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23 April 2007 |
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13 March 2007 |
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22 February 2007 |
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16 February 2007 |
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January 2007 |
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Product Views |
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How to identify your iMac 9 |
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Note About Images in This Manual 9 |
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Tools Required |
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Orientation |
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Serial Number Location |
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Safety |
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Opening the Computer |
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EMI Shielding |
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Access Door |
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Memory |
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Front Bezel |
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Camera Board |
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Battery |
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Ambient Light Sensor (ALS) Board |
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IR (Infrared) Board |
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IR/ALS Cable |
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IR/ALS Shield |
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Ambient Temperature Sensor Cable |
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Ambient Temperature Sensor |
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Bluetooth Card |
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LCD Display Panel |
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LVDS Cable |
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Inverter Cable |
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Speaker, Right |
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Optical Drive Fan |
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Power Supply, AC/DC |
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Hard Drive |
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Hard Drive Sensor Cable |
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CPU Fan 91 |
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Optical Sensor Cable |
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Optical Drive |
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Optical Temperature Sensor |
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AirPort Extreme Card |
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Bluetooth Antenna Cable |
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Logic Board |
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Hard Drive Fan |
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Speaker, Left |
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Video Card |
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AC Power Inlet |
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Camera/Microphone Cable 160 |
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AirPort Antennas |
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Clutch Cover |
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Clutch Mechanism |
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Hard Drive Temperature Sensor 180 |
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Power Supply Cable |
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iii
Hard Drive Data Cable 186
Rear Cover 189
Stand 192
Additional Procedures
Installing the VESA Mount 199
Link to Instructions 199
Retrieving the Clutch Mechanism 200
Troubleshooting
General Information 207
Serial Number 207
DDR Memory 208
Diagnostic LEDs 210
Symptom Charts 212
Power Issues 213
No Video 214
Display 218
Hard Drive 219
Optical Drive 221
Fan Sound 226
AirPort 230
Bluetooth 231
IR Remote 232
IR Sensor/Receiver 233
Built-in iSight Camera 234
Speakers 236
Mouse 237
Keyboard 238
Error Beep(s) 240
USB 240
Views
iMac (24-inch)—Upper Exploded View |
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iMac (24-inch)—Lower Exploded View |
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Screw Chart 244
iv
Service Source
iMac (24-inch)
© 2006 Apple Computer, Inc. All rights reserved.
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 firmware update after replacing the logic board.The firmware 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 661-4182 logic board will replaced by 661-4293
•The 661-4181 logic board will replaced by 661-4292
•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.
•Updated Clutch Mechanism and Stand sections in Take Apart to show how to unlock the clutch mechanism.
•Updated Upper Exploded View and created hyperlink to EEE code compatiblilty chart.
•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 (24-inch) Take Apart — General Information 6
•The “No Power” symptom in Troubleshooting has been updated. If your computer won’t turn on, try removing and reinstalling the SO-DIMMs.
December 2006
•When replacing the logic board, check that two spacers and a piece of aluminum tape have been installed in manufacturing. If the spacers are not present, refer to the logic board replacement procedure or inbox notice that ships with the logic board.
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.
17 October 2006
•9mm screws were added to the screw chart and to the logic board take apart sections
6 September 2006
•The iMac (24-inch) product introduction.
iMac (24-inch) Take Apart — General Information 7
iMac (24-inch) Take Apart — General Information 8
On the bottom of your iMac stand, you’ll find a label with the serial number printed on it:
This label also provides the computer configuration and an“EMC”number (EMC No.).The EMC number for the iMac (24-inch) computer is 2111.The EMC number is unique for different iMac models.
To confirm the configuration 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 (24-inch) has several features that distinguish it from earlier iMac models:
•2.16 GHz or 2.33 GHz Intel Core 2 Duo processor
•Mobile Express Module (MXM) type II video card: NVIDIA GeForce 7300 GT, 128 MB or NVIDIA GeForce 7600 GT, 256 MB
•24-inch TFT 8:5 aspect ratio flat panel display (1920x1200 native resolution)
•250 or 500 GB hard disk with serial ATA 150 MB/s interface
•Up to 3.0 GB system memory
Because a pre-production model was used for most of the images shown in this manual, you may notice small differences in appearance between the image pictured and the computer you are servicing. However, the steps and sequence are the same unless noted.
iMac (24-inch) Take Apart — General Information 9
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)
•Access card (Apple part number 922-7172)
•Black stick (or other nonconductive nylon or plastic flat-blade tool)
•Phillips #1 screwdriver
•Phillips #2 screwdriver
•Torx T6 screwdriver (magnetized)
•Torx T8 screwdriver (magnetized)
•Torx T10 screwdriver (magnetized)
•Flat-blade screwdriver
•Needlenose pliers
•Permanent ink felt-tip pen
For most repairs, the unit should be placed screen-side up, with the bottom facing toward you.
Most photos in this manual reflect 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.
The computer’s serial number is located on the bottom of the computer stand.
iMac (24-inch) Take Apart — General Information 10
Warning: 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.
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 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 (24-inch) Take Apart — General Information 11
Only Apple authorized, desktop certified technicians should ever remove the front bezel on the computer. When the front bezel is removed, be sure to always ground yourself and follow ESDsafe repair practices.
iMac (24-inch) Take Apart — General Information 12
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 found at your local electronics supplier.
iMac (24-inch) Take Apart — General Information 13
Tools
•Phillips #2 screwdriver
•ESD-safe workstation and mat
•Soft , clean towel or cloth
Preliminary Steps
Before you begin, place the computer face down so that the bottom is facing you.
Part Location
iMac (24-inch) Take Apart — Access Door 14
Removing the Access Door
1.Raise the stand and use a Phillips #2 screwdriver to loosen the two captive access door screws.
2.Remove the access door.
Replacing the Access Door
1.Lift the stand out of the way.
2.Position the access door on the rear housing over the memory compartment.
3.Use a Phillips #2 screwdriver to tighten the captive screws.
iMac (24-inch) Take Apart — Access Door 15
This computer comes with a minimum of 512 MB of 667 GHz PC2-5300 Double Data Rate 2 (DDR2) Small Outline Dual Inline Memory Modules (SO-DIMMs). It has two slots that can accept DIMMs. The slots are stacked (top and bottom) on the logic board behind the access door. A 512 MB, 1 GB, or 2 GB memory module may be installed for a maximum of 3 GB of memory. Although you can install up to 4 GB of memory, the system supports no more than 3 GB.
Tools
•Phillips #2 screwdriver
•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 (24-inch) Take Apart — Memory 16
Removing the Memory
1.Shut down the computer, and disconnect all cables including the power cord.
2.Holding the sides of the computer, lay it face down on a soft, clean cloth.
3.After removing the access door, touch the metal frame around the memory compartment to 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 finished replacing the memory.
4.Pull the two levers in the memory compartment toward you. If a memory module is installed in the slot, pulling the levers will eject it. Note: The levers are used to remove memory not to install memory. Always install memory by hand.
5.Set the memory module aside.
iMac (24-inch) Take Apart — Memory 17
Replacing the Memory
1.Make sure the DIMM levers are all the way open.
2.With the computer face down, orient the DIMM with the notch on the left.
3.With your fingers, press the DIMM fully into the slot until you hear a click.
4.Do not use the DIMM levers to push in the DIMM. Trying to push the DIMM into the slot using the levers may damage the SDRAM DIMM. You’ll hear a slight click when the memory is fully seated. After the memory is fully seated, close the levers.
5.Replace the access door on the memory compartment.
6.Use a Phillips #2 screwdriver to tighten the captive screws on the access door.
7.Make sure the computer recognizes the new memory by opening System Profiler, clicking
More Info, and clicking Memory.
iMac (24-inch) Take Apart — Memory 18
Tools
This procedure requires the following tools:
•Torx T8 screwdriver
•Soft, clean towel or cloth
•Black stick (or other nonconductive nylon or plastic flat-blade tool)
Preliminary Steps
Before you begin, remove the access door.
Part Location
iMac (24-inch) Take Apart — Front Bezel 19
Removing the Front Bezel
1.Place the computer on the rear cover with the stand facing you.
2.Tilt up the front bezel and remove the four screws along the bottom.
922-7011
3.While holding the memory card levers closed (not protruding from the access door opening), start tilting up the lower end of the bezel.
iMac (24-inch) Take Apart — Front Bezel 20
4.With the lower corners loosened, lift up—but do not remove—the bezel. Caution: To prevent LCD panel damage, never press on the display face.
5.Lift up the top of the bezel and notice the connected microphone and camera cables. Without straining the cables, hold the bezel up, and disconnect the camera cable from the camera board and the microphone cable from the cable extension.
iMac (24-inch) Take Apart — Front Bezel 21
6.Lift the front bezel off the computer. Note that a replacement front bezel includes the following:
•camera lens
•camera board
•camera board bracket
•microphone cable
•sensor
•gaskets
•slot-load drive felt
•metal brackets
Replacing the Front Bezel
1.When installing the front bezel, connect the camera and microphone cables and tuck the cables into the computer housing. Carefully lower the bezel onto the computer, and make sure the cables cannot be pinched.
2.Hold the memory ejector levers closed as you lower the front bezel down completely.
3.Replace the four bezel mounting screws along the bottom of the computer.
4.Replace the access door; tighten the two captive screws.
iMac (24-inch) Take Apart — Front Bezel 22
Tools
•Torx T8 screwdriver
•ESD mat, soft , clean towel or cloth
Preliminary Steps
Before you begin, remove the access door , glass panel, and front bezel.
Part Location
iMac (24-inch) Take Apart — Camera Board 23
Removing the Camera Board
1.The camera board cable is visible after you remove the front bezel off the computer.
2.Remove two T8 screws on the camera board.
3.Lift the camera board out of the rear housing enough to access the camera cable.
4.Unwrap the kapton tape over the camera cable and connector. Disconnect the camera cable from the camera board, pulling the cable to the left.
iMac (24-inch) Take Apart — Camera Board 24
Replacing the Camera Board
1.Connect the camera cable to the camera board. Reapply the kapton tape over the cable and connector.
2.Position the camera on top of the black posts (on the rear cover).
3.Replace the two T8 screws.
4.
5.
6.Connect the camera and microphone cables.
iMac (24-inch) Take Apart — Camera Board 25
7.Reapply the tape across the length of the camera board.
8.Tuck the camera board cables neatly into the channel on the rear housing.
9.Holding the memory ejector levers closed, lower the font bezel down.
10.Replace the bezel screws along the bottom of the computer.
11.Replace the access door; tighten the two captive screws.
iMac (24-inch) Take Apart — Camera Board 26
Tools
The only tool required for this procedure is a black stick (or other nonconductive plastic or nylon tool).
Preliminary Steps
Before you begin, remove the following:
•Access door
•Front bezel
Part Location
iMac (24-inch) Take Apart — Battery 27
Removing the Battery
1.Use a black stick to pry out the battery from the battery socket on the logic board.
2.Before installing the battery, make sure the side with the engraved markings (+ side) is up .
iMac (24-inch) Take Apart — Battery 28
Replacing the Battery
1.Make sure the battery socket is open and free of dust.
2.Press the battery into the socket. While holding the memory eject levers closed, replace the front bezel.
3.Replace the access door.
iMac (24-inch) Take Apart — Battery 29
Ambient Light Sensor (ALS)
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
Part Location
iMac (24-inch) Take Apart — ALS Board 30