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Service Source
iMac G5, 17-inch (Ambient Light
Sensor )
Updated 1 October 2007
© 2005 Apple Computer, Inc. All rights reserved.
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iMac G5, 17-inch (Ambient Light Sensor )
iMac G5 (17-inch) -
1
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© 2005 Apple Computer, Inc. All rights reserved.
Service Source
Take Apart
Sensor
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General Information
What’s New
October 2007
Updated Logic Board replacement procedure. A “caution” was added to notify service
providers not to twist, flex, or bend the iMac G5 logic as you install to board into the
chassis. Flexing the board may jeopardize the thermal interface between the heatsink and
the processor. Refer to the iMac logic board inbox notice 073-1158 for additional
information.
July 2006
A diecut piece of microfoam (922-7671) is included with all replacement optical drives and
display bezels. It should be installed in between the disc drive and the display bezel to
prevent optical media from ejecting out of the system and dropping to the desktop. Only
one diecut of microfoam should be used per system. Refer to the replacement procedures
in Take Apart for either the optical drive, display bezel, or microfoam shim for more
information.
Display/Bezel Assembly Elimination
Effective July 24, 2006, the Display and Bezel assembly module will no longer be available
as a single service part for the iMac G5 (17- and 20-inch models). The Display and Bezel
are now available as two separate service parts (see below) to simplify inventory and
reduce repair costs.
• 922-7275 Front Cover Assy,w/Optical Slot,iMac G5 17"
• 661-3626 Panel,Display w/Brackets,iMac G5 17"
May 2005: New Procedures and Service Parts
• Fans, Upper
• Fan, Lower
• Logic board
• Speakers
• Microphone
• AirPort/Bluetooth Combo card
• Soft modem
• Chassis
• Antennas
General Information
iMac G5, 17-inch, Ambient Light Sensor
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• LED light pipe
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iMac G5, 17-inch, Ambient Light Sensor Take Apart
General Information
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Tools Required
The following tools are required to service the computer:
• Phillips #2 screwdriver
• Phillips #1 screwdriver
• Flat-blade screwdriver
• Torx T6, T8, and T10 screwdriver
• Jeweler’s flat-blade screwdriver
• Nylon probe tool (black stick 922-5065)
• Needlenose pliers
• Soft cloth (to protect removed parts from scratches)
General Information
iMac G5, 17-inch, Ambient Light Sensor
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Important Things to Know
1. These instructions cover the iMac G5, 17-inch, Ambient Light Sensor model;
however, the procedures from the original 17-inch model are very similar. In
some steps graphics from the original model may be used.
2. All customer removable screws are brass colored (except for some fan screws
on earlier units which use torx screws). Do not remove screws unless they are
brass colored, or you will void your warranty.
3. Ground yourself when working on the computer. The procedure will show you how to
ground yourself.
4. A magnetized “L”-shaped Phillips screwdriver is included with the replacement part.
5. The midplane is no longer offered as a service part or as a Do-it-Yourself repair. Most
parts on the midplane are now available as individual service parts.
6. Additional items are included with these service parts:
Back Cover
– Two blank labels are included with the replacement back cover. Copy the serial
number and Ethernet number off the bottom of the computer’s foot and attach the
new labels to the bottom of the replacement foot. The back cover take apart
procedure will show you where to attach the labels.
7. Do not pull on individual wires when disconnecting a part; pull on the connector.
8. A screw chart is attached at the end of this document. Use the chart to identify screw
type and screw locations.
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iMac G5, 17-inch, Ambient Light Sensor Take Apart
General Information
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Ambient Light Sensor
The new iMac G5 has an ambient light sensor. It’s located on the bottom of the display
bezel, near the case screws. Look at the picture below. Next to the middle screw is a small
bump protruding from the case. This is the ambient light sensor.
The ambient light sensor attaches to the power supply with two plastic rivets.
The ambient light sensor cable runs under the power supply and attaches to the logic
board.
General Information
iMac G5, 17-inch, Ambient Light Sensor
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Removing the Back Cover
Tools Required
Use the screwdriver provided, or a Phillips #2 screwdriver
Procedure
1. Turn your computer off by choosing Shut down from the Apple (K) menu.
2. Disconnect all cables, and unplug the power cord from your computer. Put on your
ESD Wrist strap.
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iMac G5, 17-inch, Ambient Light Sensor Take Apart
Removing the Back Cover
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3. Place a soft, clean towel or cloth on the desk or surface. Hold the sides of the
computer and slowly lay the computer face down as shown.
4. Locate the three silver case screws circled below. You may have to lift the stand to
locate the middle case screw.
display/bezel assembly and cannot be removed.
Using the tool provided, or a Phillips #2 screwdriver, loosen the three captive screws.
Turn the screws to the left until they stop turning.
stop turning
.
Note:
These screws are captive; they are part of the
Don’t force the screws once they
Removing the Back Cover
iMac G5, 17-inch, Ambient Light Sensor
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5. Holding the back cover by the metal stand, tilt the cover up and lift it off the computer.
Set the back cover aside.
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iMac G5, 17-inch, Ambient Light Sensor Take Apart
Removing the Back Cover
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Replacing the Back Cover
Tools Required
Use the screwdriver provided, or a Phillips #2 screwdriver
Procedure
1. Remove the replacement back cover and foot from its packaging.
2. Replace the cover so that the slots on the top edge of the back cover mate with the
tabs on the display housing.
Replacing the Back Cover
iMac G5, 17-inch, Ambient Light Sensor
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3. Lower and press the cover into place until it fits snugly on the computer.
4. Tighten the three captive case screws by turning them to the right. Don’t overtighten
the screws.
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iMac G5, 17-inch, Ambient Light Sensor Take Apart
Replacing the Back Cover
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5. Make sure the case is not bowing along the bottom or sides. If it is, check that the
optical drive and cables are seated properly. There should be no gaps around the
edges when the screws are tightened.
6. Position the computer in the upright position. Reconnect the power cord and
remaining cables. Turn on the computer.
Replacing the Back Cover
iMac G5, 17-inch, Ambient Light Sensor
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Hard Drive
Tools Required
• Use the screwdriver provided, or a Phillips #2 screwdriver, preferably with a
magnetized tip
• Flat-blade screwdriver
• Screw tray or something equivalent to hold the screws
Preliminary Steps
Before you begin, remove the back cover.
Part Location
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iMac G5, 17-inch, Ambient Light Sensor Take Apart
Hard Drive
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Removing the Hard Drive
1. To access the hard drive you must first remove other service modules. This procedure
will show you how to remove and replace these modules.
module, set it aside, along with the screws for that module.
2. Ground yourself. Touch the metal surface (as shown below) on the inside of the
computer to discharge any static electricity.
Warning: Always discharge static electricity before you touch any parts or
install any components inside the computer. To avoid generating static
electricity, do not walk around the room until you have finished installing the
part and closed the computer
.
Note:
As you remove each
Hard Drive
iMac G5, 17-inch, Ambient Light Sensor
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3. Locate the fan cover near the top of the computer.
4. Using the tool provided, or a Phillips #2 screwdriver, remove the two fan cover screws.
Lift the fan cover off the computer. Set the screws and fan cover aside.
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iMac G5, 17-inch, Ambient Light Sensor Take Apart
Hard Drive
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5. Locate the hard drive in the top right corner.
6. Move the black video cable (located to the left of the hard drive) out of the way to
access a hard drive screw.
Hard Drive
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4. Remove the three hard drive screws. Set the screws aside.
5. Carefully lift the hard drive straight up, about one inch, and disconnect the black cable
from the white connector on the hard drive.
attached to the logic board.
Note:
Leave the other end of the cable
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iMac G5, 17-inch, Ambient Light Sensor Take Apart
Hard Drive
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6. Using your fingers, or a flat-blade screwdriver, disconnect the drive data cable and
power cable from the hard drive.
7. Lift the hard drive up and out of the midplane assembly.
drive to Apple in the packaging provided.
Important:
Return this hard
Hard Drive
iMac G5, 17-inch, Ambient Light Sensor
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Replacing the Hard Drive
1. Remove the replacement hard drive from its packaging.
2. Connect the drive data cable and power cable to the hard drive. Lower the hard drive
into place on the midplane.
3. Connect the black cable to the white connector on end of the hard drive.
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iMac G5, 17-inch, Ambient Light Sensor Take Apart
Hard Drive
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4. Replace the three hard drive screws.
5. Tuck the black video cable into the area shown by the arrows.
Hard Drive
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6. Press the video cable into the notch on the midplane chassis.
4. Replace the two fan cover screws. The larger screw attaches on the left.
sure the pull tab is sticking up as shown
Note:
Make
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iMac G5, 17-inch, Ambient Light Sensor Take Apart
Hard Drive
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Optical Drive
Tools Required
• Use the screwdriver provided, or a Phillips #2 screwdriver, preferably with a
magnetized tip
• Screw tray or equivalent to hold the screws
Preliminary Steps
Before you begin, remove the back cover.
Part Location
Note:
The education models do not have an optical drive.
Optical Drive
iMac G5, 17-inch, Ambient Light Sensor
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Removing the Optical Drive
1. Ground yourself. Touch the metal surface (as shown below) on the inside of the
computer to discharge any static electricity.
Warning: Always discharge static electricity before you touch any parts or
install any components inside the computer. To avoid generating static
electricity, do not walk around the room until you have finished installing the
part and closed the computer
.
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iMac G5, 17-inch, Ambient Light Sensor Take Apart
Optical Drive
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4. Using a Phillips #2 screwdriver, remove the three optical drive screws circled below.
Set the screws aside.
5. Pull the optical drive tab straight up and then to the right. Set the optical drive aside.
Optical Drive
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Replacing the Optical Drive
1.
Note:
A microfoam insert is included with the replacement optical drive and should be
installed using the instructions included below. The microfoam insert will prevent
optical media from ejecting out of the system and dropping to the desktop. Only one
microfoam insert should be used per system
2. Locate the enclosed piece of white microfoam and the two white posts (circled) on the
bezel.
3. With the shiny side of the microfoam facing the bezel, slide the holes of the microfoam
onto the two white posts on the bezel.
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iMac G5, 17-inch, Ambient Light Sensor Take Apart
Optical Drive
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4. Tuck the mircofoam into place before installing the optical drive.
5. Remove the replacement optical drive from its packaging.
6. Holding the optical drive by the back end (near the tab), insert the drive at an angle to
mate the bezel with the optical drive.
Optical Drive
iMac G5, 17-inch, Ambient Light Sensor
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7. Replace the three optical drive screws.
8. Make sure no microfoam is sticking out of the bezel.
computer, partially insert an optical disc to make sure it inserts smoothly.
Note:
Before reassembling the
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iMac G5, 17-inch, Ambient Light Sensor Take Apart
Optical Drive
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Microfoam Shim
Tools Required
• Use the screwdriver provided, or a Phillips #2 screwdriver, preferably with a
magnetized tip
• Screw tray or equivalent to hold the screws
Preliminary Steps
Before you begin, remove the back cover and the optical drive.
Part Location
Note:
The education models do not have an optical drive.
Microfoam Shim
iMac G5, 17-inch, Ambient Light Sensor
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Installing the Microfoam onto the Bezel
1. Steps 2-7 show photos of the microfoam on the iMac G5 20-inch computer. The
installation procedure is the same for the 17-inch computer. Go on to the next step.
2. Locate the piece of microfoam and the two white posts (circled) on the bezel.
3. With the shiny side of the microfoam facing the bezel, slide the holes of the microfoam
onto the two white posts on the bezel.
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Microfoam Shim
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4. Tuck the mircofoam into place before installing the optical drive.
5. Replace the optical drive in the direction of the arrow, lining up the white posts on the
bezel with the holes on the optical drive bezel.
Microfoam Shim
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6. Slide the optical drive into place and press down near the tab to reconnect the drive.
7. Make sure no microfoam is sticking out of the bezel.
computer, partially insert an optical disc to make sure it inserts smoothly.
Note:
Before reassembling the
8. Replace the optical drive screws.
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iMac G5, 17-inch, Ambient Light Sensor Take Apart
Microfoam Shim
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Fan Cover
Tools Required
• Use the screwdriver provided, and a Phillips #2 screwdriver, preferably with a
magnetized tip
• Screw tray or equivalent to hold the screws
Preliminary Steps
Before you begin, remove the back cover.
Part Location
.
Fan Cover
iMac G5, 17-inch, Ambient Light Sensor
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Removing the Fan Cover
1. Ground yourself. Touch the metal surface (as shown below) on the inside of the
computer to discharge any static electricity.
Warning: Always discharge static electricity before you touch any parts or
install any components inside the computer. To avoid generating static
electricity, do not walk around the room until you have finished installing the
part and closed the computer
.
4. Using a Phillips #2 for the screw on the left and a Phillips #2 for the screw on the right,
remove the two screws. Lift the fan cover off the midplane and set the fan cover aside.
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iMac G5, 17-inch, Ambient Light Sensor Take Apart
Fan Cover
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Replacing the Fan Cover
1. Replace the two fan cover screws. The larger screw attaches on the left.
sure the pull tab is sticking up as shown.
Note:
Make
Fan Cover
iMac G5, 17-inch, Ambient Light Sensor
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Fans, Upper
Tools Required
• Phillips #2 screwdriver or Torx T8 (some models have torx screws on the fan)
• Screw tray or equivalent to hold the screws
Preliminary Steps
Before you begin, remove the back cover and the fan cover.
Note:
The fans are under the fan cover
Part Location
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iMac G5, 17-inch, Ambient Light Sensor Take Apart
Fans, Upper
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Removing the Fans
Note:
Pictures from the original iMac G5 are used in this procedure. The take-apart steps
are very similar.
1. Using Phillips #2, loosen the two fan screws.
screws from the rubber grommets to remove the fan, just loosen the screws.
Note:
You don’t have to remove the
2. Disconnect the fan cable from the connector on the logic board. Pull on the black
connector, not on the cable. Route the fan cable under the black cable (as shown).
Fans, Upper
iMac G5, 17-inch, Ambient Light Sensor
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3. Lift the fan out of the computer.
4. If your are replacing the fan, remove the screws from the fan grommets. Using a
screwdriver, push the fan screws out of the grommets and set them aside. Use these
screws on the replacement fan.
5. Go on to the next step to remove the second fan.
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Fans, Upper
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6. Move the video cable to the left to access the fan screw near the top of the computer
7. Using a Phillips #2, loosen the two fan screws. Note: You don’t have to remove the
screws from the rubber grommets to remove the fan, just loosen the screws
Fans, Upper
iMac G5, 17-inch, Ambient Light Sensor
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8. Lift the fan out of the computer and disconnect the fan cable from the connector on the
logic board. Pull on the black connector, not on the cable.
9. If you are replacing the fan, remove the screws from the fan grommets. Using a
screwdriver, push the fan screws out of the grommets and set them aside.
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Fans, Upper
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Replacing the Fans
1. Route the fan cable under the black hard drive cable. Connect the fan cable to the
connector on the logic board. Note: The fan cables are keyed.
2. Place the two screws into the grommets on the replacement fan. Position the fan into
place and tighten the two fan screws
Fans, Upper
iMac G5, 17-inch, Ambient Light Sensor
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3. Tuck the video cable into the space between the fan and the hard drive.
4. Lower the larger fan into the chassis, lining up the screws with the screw holes.
Caution: Move the fan cable (from the smaller fan) out from under the larger fan as
you lower the fan into the chassis. Tighten the two fan screws.
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Fans, Upper
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5. Route the fan cable under the black cable. Connect the fan cable to the logic board.
6. Replace the two fan cover screws. The larger screw attaches on the left. Note: Make
sure the pull tab at the top of the case is sticking up as shown.
Fans, Upper
7. Replace the back cover.
iMac G5, 17-inch, Ambient Light Sensor
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.
Fan, Lower
Tools Required
The only tool required is a flat-blade screwdriver.
Preliminary Steps
Before you begin, remove the back cover.
Part Location
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Fan, Lower
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Removing the Lower Fan
1. With a flat-blade screwdriver, pry the metal bracket up.
2. Pull the bracket back so the fan begins to lift up.
Fan, Lower
iMac G5, 17-inch, Ambient Light Sensor
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3. Disconnect the fan connector on the logic board. Pull on the black connector not the
cable.
4. Grab the fan by the sides and wiggle the fan upward. As the fan comes up, it will bump
into a tab on the front bezel. See the next step.
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Fan, Lower
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5. Push the fan into the computer and at the same time, tilt the fan so that it clears the
tab on the bezel.
6. Pull the fan cable through the metal bracket (1) as you pull the fan forward (2).
Fan, Lower
iMac G5, 17-inch, Ambient Light Sensor
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Installing the Lower Fan
1. Push the lower fan into the computer, aligning the fan with the metal bracket. Notice
the location of the two gray bumps on the right side of the fan. These plastic bumps
should be in this position for this step.
Pull the fan cable through the metal bracket.
2. The edge of the fan (circled) has to clear the speaker. Push the fan into the computer
until the edge of the fan clears the speaker.
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Fan, Lower
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3. As you push the fan, make sure it clears the white tab on the display bezel.
Important: Notice the position of the gray bumps on the side of the fan. This is the
correct position for this step.
4. Lower the fan into the chassis. Pull the metal locking clip down onto the fan making
sure it secures the fan.
5. Connect the fan cable to the logic board and replace the back cover
Fan, Lower
iMac G5, 17-inch, Ambient Light Sensor
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Inverter
Tools Required
• Phillips #2 screwdriver, preferably with a magnetized tip
• Screw tray or something equivalent to hold the screws
Preliminary Steps
Before you begin, remove the back cover.
Part Location
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Inverter
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Removing the Inverter
1. To access the inverter assembly other service modules have to be removed. This
procedure will show you how to remove and replace each module. As you remove
each module, set it aside, along with the screws for that module.
2. Important: Ground yourself. Touch the metal surface (as shown below) on the inside
of the computer to discharge any static electricity.
Warning: Always discharge static electricity before you touch any parts or install any
components inside the computer. To avoid generating static electricity, do not walk
around the room until you have finished installing the part and closed the computer.
Inverter
iMac G5, 17-inch, Ambient Light Sensor
Page 53
4. Using a Phillips #2 screwdriver, remove the three optical drive screws circled below.
Set the screws aside.
5. Pull the optical drive tab straight up and then to the right. Set the optical drive aside.
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Inverter
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6. Locate the inverter-to-display panel cable connector.
7. Release the cable from the clip. Disconnect the cable.
Inverter
iMac G5, 17-inch, Ambient Light Sensor
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4. Using a Phillips #2 screwdriver, remove the brass colored inverter screw.
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Inverter
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5. Lift the inverter straight up to disconnect the inverter board.
6. Disconnect the white connector (circled below) by pulling it straight up. Lift the inverter
out of the computer.
Inverter
iMac G5, 17-inch, Ambient Light Sensor
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7. If you are installing a new inverter continue with the procedure. Turn over the inverter
as shown. Using your fingers or a flat-blade screwdriver, carefully remove the gray
plastic inverter cover by gently prying the tabs (circled below) away from the board.
Set the plastic cover aside.
8. This cover will be attached to the replacement inverter board.
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Inverter
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9. Return the inverter board to Apple in the packaging provided.
Inverter
iMac G5, 17-inch, Ambient Light Sensor
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Replacing the Inverter
1. Remove the replacement inverter from its packaging.
2. Locate the gray plastic cover you set aside.
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Inverter
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3. Install the plastic cover on the replacement inverter board. Gently squeeze the board
near each tab (circled) until all five tabs snap onto the board.
4. Connect the white connector on the inverter board to the panel. The connector is
keyed, which means it can connect only one way. Route this cable around the silver
post (to the right of the cable). Important: If the connector is not inserted correctly
there will be no video on the display
Inverter
iMac G5, 17-inch, Ambient Light Sensor
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5. As you lower the inverter into place, connect the pins on the inverter to the black
connector on the board. Use the tall silver pins as guides to align the inverter.
Important: Make sure the connector mates with the pins. Double check that it’s
connected.
6. Replace the inverter screw.
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Inverter
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4. Reconnect the inverter-to-display panel cable. Important: The connector is keyed (it
fits together only one way)
5. Secure the white connector under the metal tab and tuck the lower end of the cable
under the logic board.
Inverter
iMac G5, 17-inch, Ambient Light Sensor
Page 63
6. Replace the optical drive.
7. Replace the optical drive screws.
8. Replace the back cover.
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Inverter
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Memory (DIMMs)
Tools Required
Use the screwdriver provided, or a Phillips #2 screwdriver to open the back co
Preliminary Steps
Before you begin, remove the back cover.
Part Location
Memory (DIMMs)
iMac G5, 17-inch, Ambient Light Sensor
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Removing the Memory
1. Rotate the computer to the right so the memory is in the position shown below.
2. To release the memory from its slot, push down on the two side latches. Then pull the
memory module out of the slot. Repeat this step if you have a second memory
module. Important: Return the memory to Apple in the packaging provided.
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Memory (DIMMs)
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Replacing the Memory
1. Remove the replacement memory module from its packaging.
2. Replace the memory module(s) by lining up the notch on the module with the notch on
the slot.
Memory (DIMMs)
3. Press firmly on the memory module until it clicks into place. Use your thumb and index
finger to push the module into the slot.
iMac G5, 17-inch, Ambient Light Sensor
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Power Supply
Tools Required
• Use a Phillips #2 screwdriver
• Flat-blade screwdriver
Preliminary Steps
Before you begin, remove the back cover.
Part Location
64 - iMac G5, 17-inch, Ambient Light Sensor Take Apart
Power Supply
Page 68
Removing the Power Supply
1. Loosen the two captive screws (circled below). The screws are captive; they cannot be
removed.
2. Loosen the middle captive screw (circled) until it’s flush with the top of the power
supply. This screw attaches to the display bezel; make sure to loosen it all the way.
Power Supply
iMac G5, 17-inch, Ambient Light Sensor
Page 69
3. Disconnect the ambient light sensor from the logic board.
4. Turn the middle case screw clockwise about five revolutions. This releases the back
cover clamp screw.
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Power Supply
Page 70
5. Disconnect the power supply connector with a flat-blade screwdriver. Loosen the
connector enough so that you can remove it with your fingers.
6. Pull the power supply cable out of the connector by rocking it back and forth with your
hands and pulling it toward the power supply.
Power Supply
iMac G5, 17-inch, Ambient Light Sensor
Page 71
7. Tilt the power supply toward you until it clears the edge of the logic board. Lift it out of
the display bezel.
8. Return the power supply with the ambient light sensor to Apple in the packaging
provided.
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Power Supply
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Replacing Power Supply
1. Remove the replacement power supply from its packaging.
2. The replacement power supply has an ambient light sensor attached with two plastic
rivets. Route the ambient light sensor under the power supply.
3. Locate the notched-out area (circled) on the logic board. As you lower the power
supply into the chassis, make sure the ambient light sensor cable lines up with notch.
Note: With the cable positioned correctly, the power supply will be easier to remove.
Power Supply
iMac G5, 17-inch, Ambient Light Sensor
Page 73
4. Before installing the power supply, push the center screw up with a flat-blade
screwdriver. Note: It will be easier to install the power supply with the screw pushed
up and out of the way.
5. Tilting the power supply, line up the ambient light sensor with the opening on the
display bezel. Lower the power supply into place.
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Power Supply
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6. Once the power supply is installed, check that the ambient light sensor cable is
positioned in the notched-out area on the board.
7. Connect the black power supply cable and the ambient light sensor.
Power Supply
iMac G5, 17-inch, Ambient Light Sensor
Page 75
8. Tighten the two outer captive screws.
9. Tighten the last captive screw (circled) that attaches to the display bezel.
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Power Supply
Page 76
10. Turn the middle case screw to the left about five revolutions. This step prepares the
back cover for installation.
11. Replace the back cover.
Power Supply
iMac G5, 17-inch, Ambient Light Sensor
Page 77
AirPort/Bluetooth Card
Tools Required
• T-6 screwdriver
Preliminary Steps
Before you begin, remove the back cover.
Part Location
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AirPort/Bluetooth Card
Page 78
Removing the AirPort and Bluetooth Combo Card
1. Remove the two T-6 screws from the card.
2. Lift the card off the logic board connector. Gently disconnect the antennas from the
card.
AirPort/Bluetooth Card
iMac G5, 17-inch, Ambient Light Sensor
Page 79
Replacing the AirPort and Bluetooth Combo Card
1. Replace the two T-6 screws.
2. Gently attach the antennas to the card. Attach the card to the connector on the logic
board.
76 - iMac G5, 17-inch, Ambient Light Sensor Take Apart
AirPort/Bluetooth Card
Page 80
Modem Board
Tools Required
• T-6 screwdriver
Preliminary Steps
Before you begin, remove the back cover.
Part Location
Modem Board
iMac G5, 17-inch, Ambient Light Sensor
Page 81
Removing the Modem Board
1. Remove the two T-6 screws from the card.
2. Disconnect the modem cable from the modem board.
78 - iMac G5, 17-inch, Ambient Light Sensor Take Apart
Modem Board
Page 82
Removing the Modem Board
1. Connect the modem cable to the board.
2. Press the board onto the connector. Replace the two T-6 screws on the board.
Modem Board
3. Replace the back cover.
iMac G5, 17-inch, Ambient Light Sensor
Page 83
Battery
Tools Required
• Flat-blade screwdriver or the nylon probe tool
Preliminary Steps
Before you begin, remove the back cover.
Part Location
80 - iMac G5, 17-inch, Ambient Light Sensor Take Apart
Battery
Page 84
Removing the Battery
1. WIth a flat-blade screwdriver, plastic tool, thumb, or finger, push the battery in the
direction of the arrow to free the battery from the metal clip.
Battery
iMac G5, 17-inch, Ambient Light Sensor
Page 85
Replacing the Battery
1. Holding the battery positive side up, push the battery (in the direction of the arrow)
under the metal clip. The battery should slip into place under the clip.
2. Replace the back cover.
82 - iMac G5, 17-inch, Ambient Light Sensor Take Apart
Battery
Page 86
Midplane
Tools Required
• Phillips #1 and #2 screwdriver
• Flat-blade screwdriver
• Screw tray or equivalent to hold the screws
Preliminary Steps
• Before you begin, remove the following:
• Back cover
• Optical drive
• Inverter
• Fan cover
Part Location
Note: The midplane is no longer offered as a service module. Order the components
on the midplane individually.
Midplane
iMac G5, 17-inch, Ambient Light Sensor
Page 87
Removing the Midplane Assembly
1. Locate the black video cable next to the fans. Using a Phillips #1 screw. Remove the
two screws and set them aside. Pull up on the black tab to disconnect the cable. Flip
the cable back, so it is out of the way.
4. Using a Phillips #2 screwdriver, remove six screws. Three short screws are located in
the channel along the top of the case and the longer screws attach to the chassis.
84 - iMac G5, 17-inch, Ambient Light Sensor Take Apart
Midplane
Page 88
5. Loosen the middle power supply screw (a captive screwiest screw attaches the power
supply to the display bezel; make sure to loosen the screw all the way.
6. Locate the pull tab at the top of the computer. Lift the midplane assembly by the tab
and then grab the midplane by its the sides. As you pull in the direction of the arrow,
push the cable (in the top left corner) down through the opening in the midplane.
Midplane
iMac G5, 17-inch, Ambient Light Sensor
Page 89
Replacing the Midplane
1. Position the display/bezel assembly with the display face down on a clean soft cloth.
2. Make sure that the TMDS cable is tucked into the groove on the bezel as shown. A
cutout on the midplane chassis lines up with the groove on the display/bezel assembly
housing
86 - iMac G5, 17-inch, Ambient Light Sensor Take Apart
Midplane
Page 90
3. Lower the midplane into the display/bezel assembly housing. Pull the inverter cable
through the opening in the chassis.
4. Line up the jackscrews on the right and left sides of the midplane with the holes in the
display/bezel assembly.
Midplane
iMac G5, 17-inch, Ambient Light Sensor
Page 91
5. Tighten the middle power supply screw (a captive screwiest screw attaches the power
supply to the display bezel; make sure to tighten the screw all the way.
6. Make sure the ambient light sensor on the power supply is seated into the hole on the
display bezel. You should be able to feel a bump (circled) when you run your finger
across the bottom of the display bezel. If it’s not in position, reseat the midplane and
check again.
88 - iMac G5, 17-inch, Ambient Light Sensor Take Apart
Midplane
Page 92
7. Reconnect the video cable and replace the two video cable screws. Tuck the video
cable into the area next to the fans.
8. Press the top end of the video cable into the notch on the midplane chassis.
Midplane
iMac G5, 17-inch, Ambient Light Sensor
Page 93
4. Replace the six case screws. (The shorter screws attach along the top.)
5. Replace the inverter board
6. Replace the optical drive.
7. Replace the fan cover.
8. Replace the back cover.
90 - iMac G5, 17-inch, Ambient Light Sensor Take Apart
Midplane
Page 94
Logic Board
Tools Required
• Phillips #2 screwdriver
• Torx T10 flat-blade
• Torx T6
• Flat-blade screwdriver
• Screw tray or equivalent to hold the screws
Preliminary Steps
Before you begin, remove the following:
• Back cover
• Optical drive
• Fan cover
• Inverter
• AirPort/Bluetooth card and disconnect the antennas
• Modem card
• Memory
Logic Board
Part Location
iMac G5, 17-inch, Ambient Light Sensor
Page 95
Removing the Logic Board
Note: Some of these photos are taken from the original iMac G5 logic board take apart
since the procedure is very similar.
1. At the top of the logic board, near the fan, disconnect the two fan cables and the two
hard drive connectors.
2. Remove the two video cable screws and disconnect the video cable.
92 - iMac G5, 17-inch, Ambient Light Sensor Take Apart
Logic Board
Page 96
3. Disconnect the hard drive thermal sensor (near the memory slots) from the logic
board. Leave the other end of the thermal sensor attached to the hard drive.
4. Using a T-8 screwdriver, disconnect the two fan duct screws and lift the duct off the
logic board. Note: These two screws are longer than the other silver screws securing
the logic board to the midplane chassis.
Logic Board
iMac G5, 17-inch, Ambient Light Sensor
Page 97
5. Disconnect the lower fan cable.
6. Disconnect the two connectors (microphone and speakers). Note: Pull on the
connector, not the cables.
94 - iMac G5, 17-inch, Ambient Light Sensor Take Apart
Logic Board
Page 98
7. Disconnect the power supply cable and the ambient light sensor.
8. Using a T-10 screwdriver, remove six silver logic board screws and with a Phillips #2
screwdriver, remove the three brass screws on the logic board. Note: The numbers
are for replacement order, disregard for take-apart.
Logic Board
9. Carefully lift the logic board out of the midplane chassis.
iMac G5, 17-inch, Ambient Light Sensor
Page 99
10. Look on the back side of the logic board for the light pipe. Remove the light pipe and
place it on the replacement logic board.
11. If you don’t see the light pipe on the back of the logic board, it may be stuck in the
chassis (shown below). Use a needlenose pliers to remove the light pipe.
12. Return the logic board to Apple in the packaging provided.
96 - iMac G5, 17-inch, Ambient Light Sensor Take Apart
Logic Board
Page 100
Replacing the Logic Board
1. Locate the cleaning wipe and syringe in the replacement logic board box.
2. Clean the copper heatpad (circled). Use the alcohol wipe to clean the copper heatpad.
Logic Board
iMac G5, 17-inch, Ambient Light Sensor
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