Closing the Computer
1. Replace the access panel and the four screws. 2. Reconnect all cables and restart the computer. 2. Reconnect all cables and restart the computer. Warning Never turn on the computer unless all of its internal and external parts are in place and it is closed. Operating the computer when it is open or missing parts can damage your computer or cause injury.
IO Ports
Difficulty Plugging in an Ethernet Cable Note The Ethernet port on an iMac Flat Panel has a special mechanism to prevent modem cables from accidentally being inserted. In some cases, this mechanism can cause difficulty when attempting to plug in an Ethernet cable. 1. Verify that you are plugging into the Ethernet port. See graphic below. 1. Verify that you are plugging into the Ethernet port. See graphic below. 2. Notice that the port has two metal tabs circled below which prohibit the use of a...
Service Cables
Three extension cables 076-0897 are required when troubleshooting the iMac with the bottom housing open, as shown below. Important Diagnostic service cables allow the unit to run while the bottom housing is open as shown above . However, the computer cannot run for more than five minutes with the bottom housing open. If it is open longer, the CPU may overheat and become damaged. A power cable B drive data cable C blind mate connector The PMU Power Management Unit is a microcontroller chip that...
Procedure Uvp
1. Using a flatblade screwdriver, gently pry the battery from the battery holder. Warning Whenever the bottom housing is opened for service, you must do two things 1. You must clean the original thermal film from the surfaces joining the thermal interface layer and reapply thermal paste to the thermal pipe. 2.You must tighten the four torx screws on the bottom housing to a minimum of 17 in.-lbs. If you do not have a torque driver, you will have to make sure these screws are tightened by hand...
Procedure Trc
1. Gently remove the I O port covers from the logic board. Warning Whenever the bottom housing is opened for service, you must do two things 1.You must clean the original thermal film from the surfaces joining the thermal interface layer and reapply thermal paste to the thermal pipe. 2. You must tighten the four torx screws on the bottom housing to a minimum of 17 in.-lbs. If you do not have a torque driver, you will have to make sure these screws are tightened by hand FIRMLY, BUT NOT FORCIBLY....
Apple Hardware Test
Apple Hardware Test is a diagnostic tool for detecting problems with Apple internal hardware components such as logic board, memory, modem, video RAM, and Apple AirPort Card. The test does not check externally connected hardware components such as USB or FireWire devices it also does not check nonApple devices such as third-party PCI cards. Note The most recent Apple Hardware Test software can be downloaded from the CD Images page on AppleCare Service Source go to the Service Source home page...
Thermal Paste Application 1
The following instructions explain how to apply thermal paste to the thermal pipe in the iMac Flat Panel computer. Failure to follow these instructions could cause the computer to overheat and damage internal components. This procedure requires the following tools Plastic stylus or nylon probe tool 922-5065 to remove the old thermal paste Thermal paste 922-4757 , each tube contains 4-5 applications 1. Thoroughly clean the thermal film from the mating surfaces circled below . Use a plastic...
Procedure Ezo
1. Carefully feed the neck cables through the hole in the Faraday cage. Important The Faraday cage is very heavy and has sharp edges handle with care. 2. Pull the outer shell with Faraday attached away from the neck. Note There is no need to remove the outer shell from the Faraday unless you are replacing the outer shell. Important Be careful not to scratch the white paint on the inside of the housing shell and the metal neck plate with holes . 3. Remove the three screws in the base of the...
Preliminary Steps Tog
Before you begin, do the following Position the computer in the service stand. Before you begin, do the following Position the computer in the service stand. 1. Remove the plastic cable retainer and turn it over. Gently peel the fan gasket off the back of the cable retainer. Warning Whenever the bottom housing is opened for service, you must do two things 1.You must clean the original thermal film from the surfaces joining the thermal interface layer and reapply thermal paste to the thermal...
Base Unit
Optical-EMI Shield 922-4692 Copper Tape 922-4722 Door Assy 922-4695 SDRAM 661-2614 128 MB 661-2615 256 MB 661-2616 512 MB Hard Drive 661-2574 80 GB 661-2584 60 GB 661-2576 40 GB Optical Drive 661- 2605 DVD-R-CD-RW 661-2604 DVD-ROM CD-RW 661-2554 CD-RW I O Port Covers 922-4699 USB 922-4700 FW Battery 922-4760 RJ-11 Board 922-4701 Logic Board 661-2575 800 MHz 661-2589 700 MHz