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Apple imac usb 2 0 User Manual

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Page 141

132 - iMac (USB 2.0)  Take Apart
 Neck Assembly, 20" and 17" Displays
• Remove the power supply insulators.
• Remove the fan.
• Remove the fan bracket.
• Remove the neck spoke retainer cap.
• Remove the blind mate connector screws.
• Remove the Faraday cage.
• Remove the outer plastic housing.
• Remove the flat panel display.
• Remove the back cover 
Procedure
1. To remove the neck assembly, follow all the preliminary steps mentioned above. When 
you are finished, you will be left with the iMac...

Page 142

 iMac (USB 2.0)  Take Apart - 133
 Neck Assembly, 15" Display
Neck Assembly, 15 Display
Tools
This procedure requires the following tools:
• Torx-10 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the drive carrier assembly.
• Remove the power supply.
• Remove the power supply insulators.
• Remove the fan. 

Page 143

134 - iMac (USB 2.0)  Take Apart
 Neck Assembly, 15" Display
• Remove the plastic cable retainer (under the fan).
• Remove the cap spoke holder.
• Remove the blind mate connector screws.
• Remove the Faraday cage.
• Remove the flat panel display.
• Remove the panel shield.
• Remove the back cover 
Procedure
The neck assembly (661-2969) for the 15-inch iMac (USB 2.0) computer is shown below. It 
can be identified by the part number on the TMDS cable (circled). The part number should 
read 620-2384. 

Page 144

 iMac (USB 2.0)  Take Apart - 135
 Neck Assembly, 15" Display 

Page 145

© 2003 Apple Computer, Inc. All rights reserved.
 Service Source
Troubleshooting
iMac (USB 2.0) 

Page 146

iMac (USB 2.0) Troubleshooting - 1
 General Information
General Information
Overview:
How do you identify the different models?
1. Identify the different models by their serial number. Search for the serial number in GSX (Global Service 
Exchange) under the “Parts Lookup” or search in the Service Parts Database.
2. Identify the processor speed. If the system is up and running, select “About this Mac” under the Apple  icon in the Finder. Or, select the “More Info” button on the “About this Mac” window....

Page 147

2 - iMac (USB 2.0) Troubleshooting
 General Information
3. Whenever the17-inch LCD display (661-2715) is replaced, a display shield/gasket kit (076-0958) must 
be installed on the new panel. Instructions for installing the shield/gasket kit are included with the new 
LCD panel.
4. The LED and microphone are part of the 17-inch display bezel (922-5297); they cannot be ordered  separately.
5. The LED functions differently on the iMac (17-inch Flat Panel). The LED  does not light up when the 
power is on;...

Page 148

iMac (USB 2.0) Troubleshooting - 3
 General Information
Logic Board, Top  

Page 149

4 - iMac (USB 2.0) Troubleshooting
 General Information
Logic Board, Bottom 

Page 150

iMac (USB 2.0) Troubleshooting - 5
 General Information
I/O Ports
The PMU Chip
The PMU (Power Management Unit) is a microcontroller chip that control\
s all power functions for 
the computer. The PMU (location shown below) is a computer within a co\
mputer. It has memory, 
software, firmware, I/O, two crystals, and a CPU. Its function is to: 
• Tell the computer to turn on, turn off, sleep, wake, idle, etc.
• Manage system resets from various commands.
• Maintain parameter RAM (PRAM).
• Manage the...
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