13 March 2007
• Updated Clutch Mechanism and Stand sections in Take Apart to show how to unlock the clutch mechanism.
22 February 2007
• 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.
• The "No Power" symptom in Troubleshooting has been updated. If your computer won't turn on, try removing and reinstalling the SO-DIMMs.
• 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.
• 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.
How to identify your iMac
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.
Note About Images in This Manual
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.
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.
Serial Number Location
The computer's serial number is located on the bottom of the computer stand.
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.
Opening the Computer
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 ESD-safe repair practices.
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.
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Read how to maintain and repair any desktop and laptop computer. This Ebook has articles with photos and videos that show detailed step by step pc repair and maintenance procedures. There are many links to online videos that explain how you can build, maintain, speed up, clean, and repair your computer yourself. Put the money that you were going to pay the PC Tech in your own pocket.