Apple imacg5 20 isight Service Manual
Service Source
iMac G5 (20-inch, iSight)
14 January 2008
© 2005 Apple Computer, Inc. All rights reserved.
iMac G5 (20-inch, iSight)
Contents
Take Apart
General Information 6
Product View 6
What’s New 6
Tools Required 7
Orientation 7
Serial Number Location 7
Safety 8
Opening the Computer 9
Access Tool Modication 9
EMI Shielding 12
Lower EMI Shield 13
Speakers 14
Access Door 16
Front Bezel 18
Camera Board 26
Lower EMI Shield 32
IR Board 36
LCD Display Panel 41
Memory 49
Speakers 52
AirPort Extreme/Bluetooth Card 58
Optical Drive 61
Hard Drive 73
Power Supply, AC/DC 80
Logic Board 86
ii
AC Line Filter 97
Fan, Hard Drive 101
Fan, Optical Drive 105
Fan, CPU 108
Power Supply, DC/DC, Inverter 111
Ambient Light Sensor Board 114
Cable, Camera and IR 117
Wireless Antenna 120
Clutch 124
Chassis 128
Rear Housing 131
Stand 134
Troubleshooting
General Information 139
Serial Number Location 139
Accessing the Diagnostic LEDs 139
Testing Under Power 145
SMU (System Management Unit) 146
Resetting the SMU (System Management Unit) 146
Ports 147
DDR Memory 147
Symptom Charts 148
How to Use the Symptom Charts 148
Power Issues 149
Verbose Startup Mode 152
No Video 153
Display 156
Hard Drive 157
Optical Drive 158
Fan Sound 163
AirPort/Bluetooth 166
IR Remote 168
IR Sensor/Receiver 169
Built-in iSight Camera 170
Speakers 172
iii
Mouse 173
Keyboard 174
Error Beep(s) 176
USB 177
Views
iMac G5 (20-inch iSight)—Upper Exploded View 179
iMac G5 (20-inch iSight)—Lower Exploded View 180
Screw Chart 181
iMac (iSight 20-inch) Screws page 1 181
iMac (iSight 20-inch) Screws page 2 182
iv
Service Source
Take Apart
iMac G5 (20-inch, iSight)
© 2005 Apple Computer, Inc. All rights reserved.
Product View
General Information
What’s New
January 2008
Take Apart: Corrupted graphic in the “Cable, Camera and IR” take apart section has been •
corrected.
April 2007
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.
October 2006
EMI tape photos (922-4786 and 922-5026), used to repair torn and damaged EMI shielding, •
have been added to the EMI Shielding section in this chapter.
iMac G5 (20-inch iSight) Take Apart — General Information 6
Tools Required
The following tools are required to service the computer. Note that a special access card (part
922-7172) is required to open the front bezel.
ESD-safe workstation and mat•
Soft, clean towel or cloth (to protect the display and removed parts from scratches)•
Access card (part 922-7172)•
Black stick (or other nonconductive nylon or plastic at-blade tool)•
Phillips #1 screwdriver•
Phillips #2 screwdriver•
Torx T8 screwdriver (magnetized)•
Torx T6 screwdriver (magnetized)•
Torx T10 screwdriver (magnetized)•
Flat-blade screwdriver•
Needlenose pliers (with teeth)•
Orientation
For most repairs, the unit should be placed screen-side up, with the bottom facing toward you.
Most photos in this manual reect that orientation. The DIMM slot is located beneath the front
bezel and is more easily accessed with the unit face-down on a soft, clean cloth.
Serial Number Location
iMac G5 (iSight) serial numbers are located on the bottom of the computer stand.
iMac G5 (20-inch iSight) Take Apart — General Information 7
Safety
Warning: When the iMac G5 (iSight) 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 maintenan• ce.
Don’t work alone. In the even• t 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 iMac G5 (iSight) 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 G5 (20-inch iSight) Take Apart — General Information 8
Opening the Computer
Apple authorized, desktop certied technicians only should ever remove the front bezel on the
iMac G5 (iSight). When the front bezel is removed, be sure to always ground yourself and follow
ESD-safe repair practices
Removing the front bezel requires using a special access card (part 922-7172) to release latches
located inside the upper corners of the front bezel. Slightly bending the upper quarter of the
access tool card will help engage the latch more securely.
As you are inserting the card to disengage the latch you should squeeze the top of the bezel,
that will help take pressure o of the latch and enable it to open easier. Note: If the bezel won’t
open, try cutting the card lengthwise into 3/4 inch or 1.5 cm strips. Insert the card again, aimed
straight up, and try again.
Once the card has been released it is safe to open the bezel. See the Front Bezel Take Apart
procedure for more information.
Access Tool Modication
If you wish to modify the access card tool, order kit 076-1213. The kit contains an access card and
a piece of EMI gasket that can be cut and added to the top of the card. The additional thickness
on the card will improve the chances of making contact with each bezel latch.
Remove the tape on the gasket to expose the sticky side of the gasket. Attach the sticky side 1.
of the EMI gasket to the top of the access card.
iMac G5 (20-inch iSight) Take Apart — General Information 9
Cut the EMI gasket to the edge of the access card. 2.
Using packing tape, or something equivalent, fold the tape over the EMI gasket to attach the 3.
gasket to the card.
iMac G5 (20-inch iSight) Take Apart — General Information 10
Bend the card at a slight angle at the top to make sure the card makes contact with each 4.
latch.
Refer to the5. Front Bezel take-apart procedure for complete instructions.
iMac G5 (20-inch iSight) Take Apart — General Information 11
EMI Shielding
The iMac enclosure 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. Order EMI tape, part number 922-4786 (a long, thin strip) or 9225026 (short, wide strips).
Cover nicks with EMI tape. Pay particular attention to the EMI shielding inside the rear housing,
shown below. The EMI shield is easily damaged when replacing modules.
iMac G5 (20-inch iSight) Take Apart — General Information 12
Lower EMI Shield
EMI tape covers the top and sides of the display panel, and the lower EMI shield covers the logic
board along the bottom of the unit. The EMI tape and lower EMI shield are easily damaged when
removed, and removal is necessary in order to access most components within the unit.
Should the EMI tape that seals the display, or the EMI shield covering the bottom of the enclosure
(see photo below) accidentally tear, use the EMI tape (922-4786 or 922-5026) to repair and
completely seal the unit.
iMac G5 (20-inch iSight) Take Apart — General Information 13
When properly repaired, all edges shown below will be wrapped by EMI tape, and the tape
securely adhered to all edges. Use a “black stick” to atten the EMI tape tightly and rub out air
pockets and wrinkles.
Speakers
The speakers shown in this manual are black, however the nal production units all have white
speakers, as shown in the GSX database. Refer to the speaker part number 922-6988 for details
iMac G5 (20-inch iSight) Take Apart — General Information 14
iMac G5 (20-inch iSight) Take Apart — General Information 15
Access Door
Tools
Phillips #2 screwdriver•
ESD-safe workstation and mat•
Soft , clean towel or cloth•
Preliminary Steps
Before you begin, lay the computer down so the panel is face down and the bottom is facing
you.
Part Location
iMac G5 (20-inch iSight) Take Apart — Access Door 16
Removing the Access Door
Raise the stand and use a Phillips #2 screwdriver, to loosen the two captive access door 1.
screws.
Warning: The ambient light sensor is located between the two screws, as shown in the
graphic. Don’t mistake the ambient light sensor for a screw. Sticking a screw driver or other
sharp object in the ambient light sensor could damage the computer.
Remove the access door. 2.
Replacing the Access Door
Replace the access door using it to push the rings into the memory compartment.1.
Use a Phillips #2 screwdriver to tighten the captive screws.2.
iMac G5 (20-inch iSight) Take Apart — Access Door 17
Front Bezel
Tools
Torx T8 screwdriver•
Access card tool 922-7172 •
ESD mat, soft , clean towel or cloth•
Preliminary Steps
Before you begin, remove the access door.
Part Location
iMac G5 (20-inch iSight) Take Apart — Front Bezel 18
Removing the Front Bezel
Position unit on rear cover (back).1.
Tilt up the front bezel and remove three screws along the bottom. 2.
Warning: The ambient light sensor is located next to the center screw. Don’t mistake the
ambient light sensor for a screw. Sticking a screwdriver or other sharp object in the ambient
light sensor could damage the computer.
Slightly bending the upper quarter of the access tool card will help engage the latch more 3.
securely. Refer to the Access Tool Modication if the bezel is dicult to remove.
iMac G5 (20-inch iSight) Take Apart — Front Bezel 19
This picture shows how the access tool works. Pushing the tool up the vent on the rear cover 4.
releases the latches on the inside of the front bezel. Refer to the next step for the procedure.
Start on the left side (looking from the back of the unit). As you insert the card to disengage 5.
the latch, squeeze the top of the bezel, that will help take pressure o of the latch and
enable it to open easier. As the bezel releases, pull the bezel away from the rear housing.
iMac G5 (20-inch iSight) Take Apart — Front Bezel 20
Repeat step 5 to release the locking latch in the right corner. Again, pull the bezel away as 6.
the card releases the latch.
If the bezel won’t release, pull the bottom of the bezel out a bit and insert the access card 7.
again.
iMac G5 (20-inch iSight) Take Apart — Front Bezel 21
Repeat step 7 for the left side. 8.
Once the access card has been removed, it is safe to open the bezel. Position the unit on an 9.
ESD mat, with the bottom facing toward you. Lift up the top of the bezel and pull it up and
slightly toward you. Caution: Make sure the memory eject rings are not protruding from the
access door when you lift the bezel or you could bend or damage the eject rings.
iMac G5 (20-inch iSight) Take Apart — Front Bezel 22
Swing the bezel up so you can disconnect two cables on the camera board at the top of the 10.
bezel.
Disconnect the camera and microphone cables from the camera board. 11.
Lift the front bezel o the computer. 12. Note the microphone is part of the front bezel
assembly.
iMac G5 (20-inch iSight) Take Apart — Front Bezel 23
Replacing the Front Bezel
Make sure the black EMI shielding along the top of the LCD panel is not in the way of the 1.
bezel latches when you lower the front bezel onto the computer. Use a black stick to press
(re-stick) the EMI shielding onto the panel.
Connect the camera and microphone cables (on the camera board) to the cables sticking 2.
out of the top of the computer.
iMac G5 (20-inch iSight) Take Apart — Front Bezel 24
Tuck the cables neatly into the channel on the rear housing. 3.
Continue to lower the font bezel down over the pull rings (in the memory compartment) 4.
and then press the top corners of the front bezel to connect the magnetic latches. Note:
check that the latches are connected by lifting the front bezel at each corner.
Replace the three front bezel screws along the bottom of the computer.5.
Replace the access door; tighten the two captive screws.6.
iMac G5 (20-inch iSight) Take Apart — Front Bezel 25
Camera Board
Tools
Torx T6 screwdriver •
ESD mat, soft , clean towel or cloth•
Preliminary Steps
Before you begin, remove the access door and front bezel.
Part Location
iMac G5 (20-inch iSight) Take Apart — Camera Board 26
Removing the Camera Board
The camera board and cables are visible as you lift the front bezel o the computer. 1.
Disconnect the camera and microphone cables. 2.
iMac G5 (20-inch iSight) Take Apart — Camera Board 27
Remove the two T6 screws on the camera board. 3.
Peel back the clear mylar material to free the microphone cable from the camera board. 4.
iMac G5 (20-inch iSight) Take Apart — Camera Board 28
Remove the camera board from the front bezel. 5.
iMac G5 (20-inch iSight) Take Apart — Camera Board 29
Replacing the Camera Board
Replace the camera board on the front bezel. Carefully align and insert the camera lens until 1.
it is snug in the bezel aperture
Replace the two screws on the camera board. Route the microphone cable under the clear 2.
mylar.
Connect the camera and microphone cables. 3.
iMac G5 (20-inch iSight) Take Apart — Camera Board 30
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