Apple iMac G5, 20-inch User Manual

© 2005 Apple Computer, Inc. All rights reserved.  Service SourceiMac G5, 20-inch Updated 5 December 2007

8 - iMac G5 (20-inch) Take Apart Replacing the Back Cover5. Position the computer in the upright position. Reconnect the power cord and remaining

98 - iMac G5 (20-inch) Take Apart Hard Drive DuctHard Drive DuctTools Required• Torx T10 screwdriver, preferably with a magnetized tip• Screw tray o

iMac G5 (20-inch) Take Apart - Hard Drive DuctRemoving the Hard Drive Duct1. Remove the two screws.2. Lift off the hard drive duct.

100 - iMac G5 (20-inch) Take Apart Hard Drive DuctReplacing the Hard Drive Duct1. Place the hard drive duct over the logic board so that the bottom

iMac G5 (20-inch) Take Apart - Bluetooth BoardBluetooth BoardTools Required• Torx T6 screwdriver, preferably with a magnetized tip• Screw tray or some

102 - iMac G5 (20-inch) Take Apart Bluetooth BoardRemoving the Bluetooth Board1. Locate the Bluetooth board.2. Remove the two identical T6 screws.3.

iMac G5 (20-inch) Take Apart - Bluetooth BoardReplacing the Bluetooth Board1. Connect the Bluetooth antenna cable.2. Holding the top and bottom edges

104 - iMac G5 (20-inch) Take Apart Air DeflectorAir DeflectorTools Required• Nylon probe toolPreliminary StepsBefore you begin, remove the following

iMac G5 (20-inch) Take Apart - Air DeflectorRemoving the Air DeflectorNote: The air deflector is secured to the logic board with adhesive. 1. Using you

106 - iMac G5 (20-inch) Take Apart Air DeflectorReplacing the Air Deflector1. Peel off the adhesive backing from the air deflector.2. Note that the pi

iMac G5 (20-inch) Take Apart - Air Deflector3. Replace the optical drive. Make sure the metal flange on the optical drive fits over the air deflector. Do

iMac G5 (20-inch) Take Apart - Serial ATA Hard Drive Serial ATA Hard Drive Tools • Use the screwdriver provided, or a Phillips #1 screwdriver, prefer

108 - iMac G5 (20-inch) Take Apart Modem BoardModem BoardTools Required• Torx T6 screwdriver, preferably with a magnetized tip• Screw tray or someth

iMac G5 (20-inch) Take Apart - Modem BoardRemoving the Modem Board1. Locate the modem board.2. Remove the two identical T6 screws.3. Holding the top a

110 - iMac G5 (20-inch) Take Apart Modem BoardReplacing the Modem Board1. Connect the modem cable.2. Route the cable with ferrite bead between the m

iMac G5 (20-inch) Take Apart - Modem Board4. Replace the two screws.5. Replace the AirPort Extreme Card holder.6. Replace the AirPort Extreme Card.7.

112 - iMac G5 (20-inch) Take Apart Midplane AssemblyMidplane AssemblyTools Required• Use the screwdriver provided, or a Phillips #1 screwdriver, pre

iMac G5 (20-inch) Take Apart - Midplane AssemblyRemoving the Midplane Assembly1. To access the midplane assembly you must first remove other service mo

114 - iMac G5 (20-inch) Take Apart Midplane Assembly3. Locate the optical drive in the top left corner.4. Using the tool provided, or a Phillips #1

iMac G5 (20-inch) Take Apart - Midplane Assembly5. Pull the optical drive tab straight up and then to the right. Set the optical drive aside. 6. Locat

116 - iMac G5 (20-inch) Take Apart Midplane Assembly7. Remove the three hard drive screws. 8. Lift the hard drive straight up, about one inch, to ac

iMac G5 (20-inch) Take Apart - Midplane Assembly9. Disconnect the hard drive power and data cables. Lift the hard drive up and out of the midplane ass

10 - iMac G5 (20-inch) Take Apart Serial ATA Hard Drive Removing the Serial ATA Hard Drive 1. To access the hard drive you must first remove other

118 - iMac G5 (20-inch) Take Apart Midplane Assembly11. Rotate the computer counterclockwise so the memory is in the position shown below.12. To rel

iMac G5 (20-inch) Take Apart - Midplane Assembly13. Locate the gray plastic module on the right side of the computer. This is the inverter. You must r

120 - iMac G5 (20-inch) Take Apart Midplane Assembly15. Rotate the computer clockwise so you see the inverter cables as shown below. Tilt the invert

iMac G5 (20-inch) Take Apart - Midplane Assembly18. Locate the small, gray inverter cable cover in the top right corner.19. To unhook the cover, pull

122 - iMac G5 (20-inch) Take Apart Midplane Assembly20. Disconnect the two white connectors underneath the cover. Pull on the connectors, not on the

iMac G5 (20-inch) Take Apart - Midplane Assembly22. Disconnect the antenna cable from the end of the installed AirPort Extreme card.23. Pull the tab o

124 - iMac G5 (20-inch) Take Apart Midplane Assembly24. Reconnect the antenna cable to the hole on the AirPort card guide.25. Locate the power suppl

iMac G5 (20-inch) Take Apart - Midplane Assembly26. Remove the screw on the right and loosen the other two screws by turning them completely countercl

126 - iMac G5 (20-inch) Take Apart Midplane Assembly28. To unlatch the power supply, tighten the middle case screw by turning it clockwise five to ei

iMac G5 (20-inch) Take Apart - Midplane Assembly30. Tilt up the power supply until it clears the edge of the main circuit board. Lift it out of the co

iMac G5 (20-inch) Take Apart - Serial ATA Hard Drive3. Locate the hard drive near the top right corner. 4. Remove the three hard drive screws. Set th

128 - iMac G5 (20-inch) Take Apart Midplane Assembly32. Locate the black video cable running alongside the fan. 33. To disconnect the cable from the

iMac G5 (20-inch) Take Apart - Midplane Assembly34. Release the cable from the metal cable clips (circled below)35. Flip the cable back, so it is out

130 - iMac G5 (20-inch) Take Apart Midplane Assembly36. Locate the pull tab. Pull the tab up to release the midplane assembly from the display/bezel

iMac G5 (20-inch) Take Apart - Midplane AssemblyReplacing the Midplane1. Remove the replacement midplane from its packaging. 2. Position the display/b

132 - iMac G5 (20-inch) Take Apart Midplane Assembly3. Make sure that the black video cable is tucked into the groove on the bezel as shown. Use the

iMac G5 (20-inch) Take Apart - Midplane Assembly6. As you lower the midplane, pull the inverter cables through the openings on the right side of the m

134 - iMac G5 (20-inch) Take Apart Midplane Assembly8. Connect the two hard drive cables and lower the hard drive into the midplane.9. Reconnect the

iMac G5 (20-inch) Take Apart - Midplane Assembly10. Replace the hard drive screws. The smaller screws attach on the top side.11. Locate the inverter c

136 - iMac G5 (20-inch) Take Apart Midplane Assembly12. Lower the cable cover, pressing down steadily until the tabs lock the cover into place. 13.

iMac G5 (20-inch) Take Apart - Midplane Assembly14. Connect the inverter cables, connecting the larger connector first. Note: The connectors are keyed,

12 - iMac G5 (20-inch) Take Apart Serial ATA Hard Drive5. Lift the hard drive straight up, about one inch, to access the connector shown below. Di

138 - iMac G5 (20-inch) Take Apart Midplane Assembly16. Tuck the inverter cables along the edge of the hard drive and next to the memory tabs.17. Re

iMac G5 (20-inch) Take Apart - Midplane Assembly18. Replace the power supply. Tilt up the power supply until it clears the edge of the main circuit bo

140 - iMac G5 (20-inch) Take Apart Midplane Assembly20. Connect the black power supply connector and tighten the two captive screws (circled), turni

iMac G5 (20-inch) Take Apart - Midplane Assembly22. Turn the middle case screw counterclockwise about five revolutions. This step prepares the back cov

142 - iMac G5 (20-inch) Take Apart Midplane Assembly24. Slide the optical drive into place and press down near the tab to reconnect the drive. If th

iMac G5 (20-inch) Take Apart - Midplane Assembly26. If present, slide the AirPort Extreme card into the AirPort card guide channel until it clicks int

144 - iMac G5 (20-inch) Take Apart Midplane Assembly27. Connect the antenna cable to the end of the installed AirPort Extreme card. 28. Make sure th

iMac G5 (20-inch) Take Apart - Midplane Assembly-Short CutMidplane Assembly-Short CutTools Required• Use the screwdriver provided, or a Phillips #1 sc

146 - iMac G5 (20-inch) Take Apart Midplane Assembly-Short CutRemoving the Midplane Assembly-Short Cut1. Ground yourself. Touch the metal surface (a

iMac G5 (20-inch) Take Apart - Midplane Assembly-Short Cut2. Locate the optical drive in the top left corner.3. Using the tool provided, or a Phillips

iMac G5 (20-inch) Take Apart - Serial ATA Hard Drive Replacing the Serial ATA Hard Drive 1. Remove the replacement hard drive from its packaging. 2.

148 - iMac G5 (20-inch) Take Apart Midplane Assembly-Short Cut4. Pull the optical drive tab straight up and then to the right. Set the optical drive

iMac G5 (20-inch) Take Apart - Midplane Assembly-Short Cut5. Locate the gray plastic module on the right side of the computer. This is the inverter. Y

150 - iMac G5 (20-inch) Take Apart Midplane Assembly-Short Cut7. Rotate the computer clockwise so you see the inverter cables as shown below. Tilt t

iMac G5 (20-inch) Take Apart - Midplane Assembly-Short Cut10. Locate the small, gray inverter cable cover in the top right corner.11. To unhook the c

152 - iMac G5 (20-inch) Take Apart Midplane Assembly-Short Cut12. Disconnect the two white connectors underneath the cover. Pull on the connectors,

iMac G5 (20-inch) Take Apart - Midplane Assembly-Short Cut14. Loosen the middle screw until the screw is flush with the top of the power supply. This s

154 - iMac G5 (20-inch) Take Apart Midplane Assembly-Short Cut16. Remove the six screws (four identical, short, brass-colored screws in the channel

iMac G5 (20-inch) Take Apart - Midplane Assembly-Short Cut18. To disconnect the cable from the board, remove the two screws at the end of the cable an

156 - iMac G5 (20-inch) Take Apart Midplane Assembly-Short Cut20. Flip the cable back, so it is out of the way for the next step. 21. Locate the pul

iMac G5 (20-inch) Take Apart - Midplane Assembly-Short Cut22. Push the inverter cables down through the openings on the midplane assembly. Lift the mi

14 - iMac G5 (20-inch) Take Apart Serial ATA Hard Drive4. Replace the three hard drive screws.

158 - iMac G5 (20-inch) Take Apart Midplane Assembly-Short CutReplacing the Midplane1. Remove the replacement midplane from its packaging. 2. Positi

iMac G5 (20-inch) Take Apart - Midplane Assembly-Short Cut3. Make sure that the black video cable is tucked into the groove on the bezel as shown. Use

160 - iMac G5 (20-inch) Take Apart Midplane Assembly-Short Cut6. As you lower the midplane, pull the inverter cables through the openings on the rig

iMac G5 (20-inch) Take Apart - Midplane Assembly-Short Cut8. Connect the two hard drive cables and lower the hard drive into the midplane.9. Reconnect

162 - iMac G5 (20-inch) Take Apart Midplane Assembly-Short Cut10. Replace the hard drive screws. The smaller screws attach on the top side.11. Locat

iMac G5 (20-inch) Take Apart - Midplane Assembly-Short Cut12. Lower the cable cover, pressing down steadily until the tabs lock the cover into place.

164 - iMac G5 (20-inch) Take Apart Midplane Assembly-Short Cut14. Connect the inverter cables, connecting the larger connector first. Note: The conne

iMac G5 (20-inch) Take Apart - Midplane Assembly-Short Cut16. Tuck the inverter cables along the edge of the hard drive and next to the memory tabs.17

166 - iMac G5 (20-inch) Take Apart Midplane Assembly-Short Cut18. Replace the power supply. Tilt up the power supply until it clears the edge of the

iMac G5 (20-inch) Take Apart - Midplane Assembly-Short Cut20. Connect the black power supply connector and tighten the two captive screws (circled), t

iMac G5 (20-inch) Take Apart - Optical Drive Optical Drive Tools • Use the screwdriver provided, or a Phillips #1 screwdriver, preferably with a mag

168 - iMac G5 (20-inch) Take Apart Midplane Assembly-Short Cut22. Turn the middle case screw counterclockwise about five revolutions. This step prepa

iMac G5 (20-inch) Take Apart - Midplane Assembly-Short Cut24. Slide the optical drive into place and press down near the tab to reconnect the drive. I

170 - iMac G5 (20-inch) Take Apart Midplane Assembly-Short Cut26. If present, slide the AirPort Extreme card into the AirPort card guide channel unt

iMac G5 (20-inch) Take Apart - Midplane Assembly-Short Cut27. Connect the antenna cable to the end of the installed AirPort Extreme card. 28. Make sur

172 - iMac G5 (20-inch) Take Apart Bluetooth Antenna CableBluetooth Antenna CableTools Required• Nylon probe tool• Flat-blade screwdriverPreliminary

iMac G5 (20-inch) Take Apart - Bluetooth Antenna CableRemoving the Bluetooth Antenna Cable1. Holding the midplane vertical, route the Bluetooth antenn

174 - iMac G5 (20-inch) Take Apart Bluetooth Antenna Cable2. On the other side of the midplane, note the placement of the other end of the Bluetooth

iMac G5 (20-inch) Take Apart - Bluetooth Antenna Cable5. Near the Bluetooth holder, note that the Bluetooth antenna cable runs underneath the speaker

176 - iMac G5 (20-inch) Take Apart Bluetooth Antenna CableReplacing the Bluetooth Antenna Cable1. On the back of the midplane chassis, route the Blu

iMac G5 (20-inch) Take Apart - LCD PanelLCD PanelTools Required• Torx T10 screwdriver, preferably with a magnetized tip• Clean, soft, lint-free towel

16 - iMac G5 (20-inch) Take Apart Optical Drive Removing the Optical Drive 1. Ground yourself. Touch the metal surface (as shown below) on the ins

178 - iMac G5 (20-inch) Take Apart LCD PanelRemoving the LCD Panel1. Place the display bezel/LCD panel assembly face-down on a clean, soft, lint-fre

iMac G5 (20-inch) Take Apart - LCD Panel4. Holding the top and bottom edges of the panel, lift it out of the bezel.

180 - iMac G5 (20-inch) Take Apart LCD PanelReplacing the LCD Panel1. Check the routing of the LCD panel cables.Note: The replacement LCD panel incl

iMac G5 (20-inch) Take Apart - LCD Panel4. Place the LCD panel into the bezel so that all six screw holes on the brackets align with the screw holes o

182 - iMac G5 (20-inch) Take Apart Front BezelFront BezelTools Required• Clean, soft, lint-free towel or blanketPreliminary StepsBefore you begin, r

iMac G5 (20-inch) Take Apart - Front BezelRemoving the Front BezelWith all preliminary steps performed, the front bezel is the part that remains.Note:

184 - iMac G5 (20-inch) Take Apart Front BezelReplacing the Front Bezel1. Before installing the LCD panel and reassembling the computer, make sure t

iMac G5 (20-inch) Take Apart - Front Bezel6. Tuck the mircofoam into place before installing the optical drive.7. Remove the replacement optical drive

186 - iMac G5 (20-inch) Take Apart Front Bezel9. Slide the optical drive into place (#1) and press down (#2) near the tab to reconnect the drive. 10

iMac G5 (20-inch) Take Apart - Front Bezel11. Replace the four optical drive screws. 12. Replace the back cover.

iMac G5 (20-inch) Take Apart - Optical Drive2. Locate the optical drive in the top left corner. 3. Using the tool provided, or a Phillips #1 screwdri

188 - iMac G5 (20-inch) Take Apart Light Pipe with GasketLight Pipe with GasketTools RequiredNo tools are required for this procedure.Preliminary St

iMac G5 (20-inch) Take Apart - Light Pipe with GasketRemoving the Light Pipe with Gasket1. On the underside of the midplane chassis, locate the light

190 - iMac G5 (20-inch) Take Apart Light Pipe with GasketReplacing the Light Pipe with Gasket1. Peel the adhesive backing off of the narrower end of

iMac G5 (20-inch) Take Apart - Light Pipe with Gasket3. Press the light pipe with gasket into place.4. Replace the midplane.5. Replace the back cover.

192 - iMac G5 (20-inch) Take Apart Microphone CableMicrophone CableTools Required• Needlenose pliersPreliminary StepsBefore you begin, remove the fo

iMac G5 (20-inch) Take Apart - Microphone CableRemoving the Microphone Cable1. From the top of the logic board at the bottom of the port bank, use a n

194 - iMac G5 (20-inch) Take Apart Microphone Cable3. Place the midplane upright. Holding the other cables aside, route the fan cable and connector

iMac G5 (20-inch) Take Apart - Microphone Cable4. Route the microphone cable connector through the midplane chassis opening.Important: The microphone

196 - iMac G5 (20-inch) Take Apart Microphone Cable5. Note the routing of the microphone cable. Peel up the speaker tape, and lift up the microphone

iMac G5 (20-inch) Take Apart - Microphone CableReplacing the Microphone Cable1. Secure the microphone cable to the speaker, and apply new tape.Note: A

© 2004 Apple Computer, Inc. All rights reserved.  Service SourceTake Apart iMac G5 (20-inch)

18 - iMac G5 (20-inch) Take Apart Optical Drive4. Pull the optical drive tab straight up and then to the right. Set the optical drive aside. 5. Im

198 - iMac G5 (20-inch) Take Apart Speaker SetSpeaker SetTools Required• Needlenose pliers• Torx T10 screwdriver, preferably with a magnetized tip•

iMac G5 (20-inch) Take Apart - Speaker SetRemoving the Speaker Set1. Locate the two speakers on the midplane chassis.2. From the top of the logic boar

200 - iMac G5 (20-inch) Take Apart Speaker Set5. Route the narrower microphone cable connector through the opening in the midplane chassis. Note: Th

iMac G5 (20-inch) Take Apart - Speaker Set6. Route the widest speaker cable connector through the midplane chassis opening.7. Place the midplane flat o

202 - iMac G5 (20-inch) Take Apart Speaker Set8. Without straining the speaker or fan cable, use a flat-blade screwdriver to carefully lift up the ca

iMac G5 (20-inch) Take Apart - Speaker Set9. Turn over the computer chassis and note the location of the remaining speaker screws. Remove the three sc

204 - iMac G5 (20-inch) Take Apart Speaker Set10. Lift the speakers off of the chassis standoffs.

iMac G5 (20-inch) Take Apart - Speaker Set11. Replacement Note: If you are replacing the speaker set, remove the microphone cable from the speaker an

206 - iMac G5 (20-inch) Take Apart Speaker SetReplacing the Speaker Set1. Note: The speaker set includes the two speakers, speaker housing, and atta

iMac G5 (20-inch) Take Apart - Lower FanLower FanTools Required• Flat-blade screwdriver• Torx T10 screwdriver, preferably with a magnetized tip• Screw

iMac G5 (20-inch) Take Apart - Optical Drive Replacing the Optical Drive 1. Note: A microfoam insert is included with the replacement optical drive

208 - iMac G5 (20-inch) Take Apart Lower FanRemoving the Lower Fan1. From the top of the logic board at the bottom of the port bank, use a needlenos

iMac G5 (20-inch) Take Apart - Lower Fan3. Without straining any of the cables, use a flat-blade screwdriver to carefully pry open the cable guides on

210 - iMac G5 (20-inch) Take Apart Lower Fan5. Remove the fan from the chassis.

iMac G5 (20-inch) Take Apart - Lower FanReplacing the Lower Fan1. With the midplane assembly positioned over the edge of the table, align the fan scre

212 - iMac G5 (20-inch) Take Apart AirPort Extreme Antenna CableAirPort Extreme Antenna CableTools Required• Torx T10 screwdriver, preferably with a

iMac G5 (20-inch) Take Apart - AirPort Extreme Antenna CableRemoving the AirPort Extreme Antenna Cable1. Note the routing of the AirPort antenna cable

214 - iMac G5 (20-inch) Take Apart AirPort Extreme Antenna Cable3. Release the cable from the remaining cable guide and from where it is sandwiched

iMac G5 (20-inch) Take Apart - AirPort Extreme Antenna Cable5. Note that the AirPort antenna cable includes the attached board.

216 - iMac G5 (20-inch) Take Apart AirPort Extreme Antenna CableReplacing the AirPort Extreme Antenna Cable1. Route the antenna through the corner o

iMac G5 (20-inch) Take Apart - Midplane ChassisMidplane ChassisTools RequiredNo tools are required for this procedure.Preliminary StepsBefore you begi

20 - iMac G5 (20-inch) Take Apart Optical Drive4. Tuck the mircofoam into place before installing the optical drive.5. Remove the replacement opti

218 - iMac G5 (20-inch) Take Apart Midplane ChassisPart Location

iMac G5 (20-inch) Take Apart - Midplane ChassisRemoving the Midplane ChassisNote: With all of the preliminary steps completed, the midplane chassis i

220 - iMac G5 (20-inch) Take Apart Midplane Chassis2. On the other side of the chassis, note that the midplane chassis includes the mesh tape that b

iMac G5 (20-inch) Take Apart - Midplane ChassisReplacing the Midplane Chassis1. Make sure the midplane chassis is clean.2. Replace the lower fan.3. Re

© 2004 Apple Computer, Inc. All rights reserved.  Service SourceTroubleshooting iMac G5 (20-inch)

iMac G5, 20-inch Troubleshooting - 1 General Information General Information Repair Extension Program for Video and Power Issues Apple has announc

2 - iMac G5, 20-inch Troubleshooting General Information Eligible Products The program is available for first generation iMac G5 models that were sol

iMac G5, 20-inch Troubleshooting - 3 General Information Note: Only first generation iMac G5 models are eligible for the repair extension program..

4 - iMac G5, 20-inch Troubleshooting General Information Replacement Parts If a logic board and/or power supply must be replaced, order on a like-fo

iMac G5, 20-inch Troubleshooting - 5 General Informationmust order logic boards as stock parts using the part numbers listed above. To receive cred

iMac G5 (20-inch) Take Apart - Optical Drive7. The optical drive will click into place when you push down near the pull tab. Note: If the optical

6 - iMac G5, 20-inch Troubleshooting Amendment: iMac G5 Repair Extension Program for Power Supply Issues Overview iMac G5 first-generation 20-inch iM

iMac G5, 20-inch Troubleshooting - 7 Amendment: iMac G5 Repair Extension Program for Eligible Products 1. The iMac G5 Repair Extension Program app

8 - iMac G5, 20-inch Troubleshooting Amendment: iMac G5 Repair Extension Program for3. Remove the power supply. Turn the power supply over to view t

iMac G5, 20-inch Troubleshooting - 9 Amendment: iMac G5 Repair Extension Program for Replacement Part The following part is eligible for replaceme

10 - iMac G5, 20-inch Troubleshooting Amendment: iMac G5 Repair Extension Program forFor out-of-warranty computers, check the Override Warranty box

iMac G5, 20-inch Troubleshooting - 11 Troubleshooting Video Issues Troubleshooting Video Issues Video Symptoms Affected computers will exhibit one

12 - iMac G5, 20-inch Troubleshooting Troubleshooting Video Issues4. Affected capacitors will have a “+” sign stamped into the top of the capacitor.

iMac G5, 20-inch Troubleshooting - 13 Troubleshooting Video Issues6. If the logic board has bulged or vented capacitors, replace the logic board. 7

14 - iMac G5, 20-inch Troubleshooting Troubleshooting Video Issues Special CompTIA Codes Apple has created the following two CompTIA Codes to use fo

iMac G5, 20-inch Troubleshooting - 15 Troubleshooting Power Issues Troubleshooting Power Issues Power Symptoms The affected power supplies are rate

22 - iMac G5 (20-inch) Take Apart Optical Drive9. Replace the four optical drive screws.

16 - iMac G5, 20-inch Troubleshooting Troubleshooting Power Issues6. Remove the power supply. Turn over the power supply to view the label. Affected

iMac G5, 20-inch Troubleshooting - 17 Troubleshooting Power Issues8. While doing the power supply repair, inspect the capacitors (highlighted below

18 - iMac G5, 20-inch Troubleshooting Troubleshooting Power Issues10. Failed capacitors will no longer have a flat top and can be identified by signs

iMac G5, 20-inch Troubleshooting - 19 Troubleshooting Power Issues Special CompTIA Codes Apple has created the following two CompTIA Codes to use f

20 - iMac G5, 20-inch Troubleshooting Serial Number Location Serial Number Location The iMac G5 serial number is located on the bottom of the comput

iMac G5, 20-inch Troubleshooting - 21 Diagnostic LEDsDiagnostic LEDsThe iMac G5 has built-in diagnostic LEDs (shown below) on the main logic board tha

22 - iMac G5, 20-inch Troubleshooting Diagnostic LEDs3. Place a soft, clean towel or cloth on the desk or surface. Hold the sides of the computer and

iMac G5, 20-inch Troubleshooting - 23 Diagnostic LEDs5. As you hold the metal foot, tilt the back cover up and lift it away from the computer. The bac

24 - iMac G5, 20-inch Troubleshooting Diagnostic LEDs7. Locate the large white arrow in the middle of the board. Above this arrow, you'll see fou

iMac G5, 20-inch Troubleshooting - 25 Internal Power ButtonInternal Power ButtonTo the left of the diagnostic LEDs are two buttons. The top button is

iMac G5 (20-inch) Take Apart - Microfoam Shim Microfoam Shim Tools Required • Use the screwdriver provided, or a Phillips #2 screwdriver, preferably

26 - iMac G5, 20-inch Troubleshooting Internal Power ButtonTo power on the computer with the back cover off: 1. First remove the back cover.2. Plug in

iMac G5, 20-inch Troubleshooting - 27 SMU ButtonSMU ButtonThe iMac G5 uses an advanced system management unit (SMU) to manage the thermal and wattage

28 - iMac G5, 20-inch Troubleshooting Portsconsumption are monitored by the operating system which communicates with the SMU, which in turn controls a

iMac G5, 20-inch Troubleshooting - 29 PortsDDR MemoryiMac G5 computers work with memory modules (DIMMs) that meet all of these criteria: PC3200, 2.5V,

30 - iMac G5, 20-inch Troubleshooting Symptom ChartsSymptom ChartsHow to Use the Symptom ChartsThe Symptom Charts included in this chapter will help y

iMac G5, 20-inch Troubleshooting - 31 Symptom ChartsPower IssuesNo Power The iMac G5 will not turn on. The display has no picture or color and no soun

32 - iMac G5, 20-inch Troubleshooting Symptom Charts8. Plug the power cord into the iMac G5 and into the AC outlet. Check to see if LED #1 is On or Of

iMac G5, 20-inch Troubleshooting - 33 Symptom Charts10. Does the computer start up normally after pressing the internal power button?Yes: Press and ho

34 - iMac G5, 20-inch Troubleshooting Symptom ChartsYes: The hard drive needs to be replaced.No: Go to the next step.13. When pressing the internal po

iMac G5, 20-inch Troubleshooting - 35 Symptom ChartsNo VideoThe computer will turn on, but the display has no picture or color. The boot chime can be

24 - iMac G5 (20-inch) Take Apart Microfoam Shim Installing the Microfoam onto the Bezel 1. Steps 2-7 show photos of the microfoam inside the iMa

36 - iMac G5, 20-inch Troubleshooting Symptom Charts6. Remove the back cover to access the diagnostic LEDs on the main logic board. 7. With the back

iMac G5, 20-inch Troubleshooting - 37 Symptom Charts10. When the computer starts up, LED #2 will light after you hear the boot chime indicating the lo

38 - iMac G5, 20-inch Troubleshooting Symptom Charts13. Unplug the iMac G5 and remove the SDRAM. Replace with known good SDRAM. Plug the iMac G5 back

iMac G5, 20-inch Troubleshooting - 39 Symptom ChartsYes: Problem solved. No: Replace the logic board.

40 - iMac G5, 20-inch Troubleshooting Symptom ChartsWhen displaying a single color over the screen area, the LCD panel shows one or more pixels that a

iMac G5, 20-inch Troubleshooting - 41 Symptom ChartsHard DriveIn a hard drive failure, the computer fails to boot to the desktop and may display a flas

42 - iMac G5, 20-inch Troubleshooting Symptom ChartsFlashing question mark appears on the screen1. Boot from the system CD that came with the computer

iMac G5, 20-inch Troubleshooting - 43 Symptom ChartsFrom the Apple menu, choose About This Mac. From the window that pops up, click on More Info. An a

44 - iMac G5, 20-inch Troubleshooting Symptom Charts• Unknown Error: If you see “Unknown Error”, without “-2147352480”, you will want to see Knowledge

iMac G5, 20-inch Troubleshooting - 45 Symptom ChartsInserting Discs Issue1. Is there a disc already in the drive? Refer to Knowledge Base article 1067

iMac G5 (20-inch) Take Apart - Microfoam Shim4. Tuck the mircofoam into place before installing the optical drive.5. Replace the optical drive in the

46 - iMac G5, 20-inch Troubleshooting Symptom ChartsFan SoundLoud fan noise coming from inside the computerThe grill on the bottom of the iMac G5 lets

iMac G5, 20-inch Troubleshooting - 47 Symptom ChartsNo: If the fan activity does not coincide with CPU usage, the sound you're hearing may not be

48 - iMac G5, 20-inch Troubleshooting Symptom Charts5. Power off your computer, remove the power cord and any other cables that are connected to your

iMac G5, 20-inch Troubleshooting - 49 Symptom ChartsFans are running at a constant high speedIf the fans on the system are running at a constant high

50 - iMac G5, 20-inch Troubleshooting Symptom Charts8. If your antenna is plugged in properly and your AirPort card is recognized there are a number o

iMac G5, 20-inch Troubleshooting - 51 Symptom ChartsMy AirPort signal seems to be very week1. Check your antenna. If the AirPort antenna is not plugge

52 - iMac G5, 20-inch Troubleshooting Symptom ChartsSpeakersI don’t hear sound from the speakers.1. Press the F5 button on your keyboard. It has a sou

iMac G5, 20-inch Troubleshooting - 53 Symptom ChartsI hear sound out of only one speaker.1. Are there any external microphones, speakers or headphones

54 - iMac G5, 20-inch Troubleshooting Symptom Chartsif they have any suggestions or assistance.3. Try a known good USB mouse.4. Replace the mouse.5. R

iMac G5, 20-inch Troubleshooting - 55 Symptom ChartsYes: Replace the keyboard.No: Replace the logic board.Certain keys don't work.1. Unplug all d

26 - iMac G5 (20-inch) Take Apart Microfoam Shim6. Slide the optical drive into place and press down near the tab to reconnect the drive. 7. Make

56 - iMac G5, 20-inch Troubleshooting Symptom ChartsWhen I type, strange characters appear on the screen.1. Depending on your iMac's settings, a

iMac G5, 20-inch Troubleshooting - 57Error Beep(s) Symptom ChartsError Beep(s)Computer beeps at startup.1. Check that the memory DIMMs are iMac G5 com

© 2005 Apple Computer, Inc. All rights reserved.  Service SourceViews iMac G5, 20-inch

i Mac G5, 20-inch Views - 1 iMac G5, 20-inchHard Drive Duct922-6822Cover, Inverter, Lamp Wires922-6820Cover, Inverter922-6819Hard Drive Power Cabl

2 - iMac G5, 20-inch Views Screw Matrix for 20-inch Screw Matrix for 20-inch Note: These are not to scale.• 922-6856 922-6663 •

i Mac G5, 20-inch Views - 3 Screw Locators Screw Locators To Access the Optical Drive

4 - iMac G5, 20-inch Views Screw Locators To Access the Inverter

i Mac G5, 20-inch Views - 5 Screw Locators To Access the Hard Drive

6 - iMac G5, 20-inch Views Screw Locators To Access the Display/Bezel-Part 1

i Mac G5, 20-inch Views - 7 Screw Locators To Access the Display/Bezel-Part 2

iMac G5 (20-inch) Take Apart - Inverter Inverter Tools Required • Use the screwdriver provided, or a Phillips #1 screwdriver, preferably with a magne

8 - iMac G5, 20-inch Views Screw Locators To Access the Display/Bezel-Part 3

i Mac G5, 20-inch Views - 9 Screw Locators To Access the Midplane Assembly-Part 1

10 - iMac G5, 20-inch Views Screw Locators To Access the Midplane Assembly-Part 2

i Mac G5, 20-inch Views - 11 Screw Locators To Access the Midplane Assembly-Part 3

© 2005 Apple Computer, Inc. All rights reserved.  Service SourceRepair Extension Program iMac G5 (20-inch)

iMac G5 (20-inch) Repair Extension Program - 1 Repair Extension Program for Video and Power Issues Apple has announced the iMac G5 Repair Extension

iMac G5 (20-inch) Repair Extension Program - 2Note : Only the Non-PFC* power supplies sold in Canada, Japan and the U.S. are eligible for coverage u

iMac G5 (20-inch) Repair Extension Program - 3 Eligible Products The program is available for first generation iMac G5 models that were sold between

iMac G5 (20-inch) Repair Extension Program - 4Note: Only first generation iMac G5 models are eligible for the repair extension program. Note: Cust

iMac G5 (20-inch) Repair Extension Program - 5 Replacement Parts If a logic board and/or power supply must be replaced, order on a like-for-like bas

iMac G5 (20-inch) Take Apart - General Information General Information What’s New October 2007 Updated Logic Board replacement procedure. A “caution

28 - iMac G5 (20-inch) Take Apart Inverter Removing the Inverter 1. To access the inverter other service modules have to be removed. This procedur

iMac G5 (20-inch) Repair Extension Program - 6 European IMCs For repairs covered under the iMac G5 REP for Video and Power Issues, IMCs in Europe mu

iMac G5 (20-inch) Repair Extension Program - 7 Troubleshooting Video Issues Video Symptoms Affected computers will exhibit one or more of the follow

iMac G5 (20-inch) Repair Extension Program - 8 4. Affected capacitors will have a “+” sign stamped into the top of the capacitor. Note: Not all c

iMac G5 (20-inch) Repair Extension Program - 9 6. If the logic board has bulged or vented capacitors, replace the logic board. 7. If the logic board

iMac G5 (20-inch) Repair Extension Program - 10 Special CompTIA Codes Apple has created the following two CompTIA Codes to use for repairs on iMac p

iMac G5 (20-inch) Repair Extension Program - 11 Troubleshooting Power Issues Power Symptoms The affected power supplies are rated for 100VAC-127VAC

iMac G5 (20-inch) Repair Extension Program - 12 5. Remove the power supply. Turn over the power supply to view the label. Affected power supplies ha

iMac G5 (20-inch) Repair Extension Program - 13 7. While doing the power supply repair, inspect the capacitors (highlighted below) on the logic boar

iMac G5 (20-inch) Repair Extension Program - 14 9. Failed capacitors will no longer have a flat top and can be identified by signs of bulging (shown b

iMac G5 (20-inch) Repair Extension Program - 15 Special CompTIA Codes Apple has created the following two CompTIA Codes to use for repairs on iMac p

iMac G5 (20-inch) Take Apart - Inverter3. Locate the hard drive near the top right corner. 4. Disconnect the black cable from the white connector on

iMac G5 (20-inch) Repair Extension Program - 16 Amendment: iMac G5 Repair Extension Program for Power Supply Issues Overview iMac G5 first-generation

iMac G5 (20-inch) Repair Extension Program - 17 Eligible Products 1. The iMac G5 Repair Extension Program applies to 20-inch iMac G5 systems that:•

iMac G5 (20-inch) Repair Extension Program - 18 3. Remove the power supply. Turn the power supply over to view the label. Affected power supplies ha

iMac G5 (20-inch) Repair Extension Program - 19 Replacement Part The following part is eligible for replacement under this repair extension program:

iMac G5 (20-inch) Repair Extension Program - 20 For out-of-warranty computers, check the Override Warranty box in the Coverage section of GCRM and s

30 - iMac G5 (20-inch) Take Apart Inverter5. Locate the memory module(s) in the bottom right corner. You must remove the memory to gain access to

iMac G5 (20-inch) Take Apart - Inverter8. Locate the gray plastic module on the right side of the computer. This is the inverter. 9. Remove the three

32 - iMac G5 (20-inch) Take Apart Inverter10. Rotate the computer clockwise so you see the inverter cables as shown below. Tilt the inverter to ac

iMac G5 (20-inch) Take Apart - Inverter13. Locate the small, gray inverter cable cover in the top right corner. To unhook the cover, pull it in the d

34 - iMac G5 (20-inch) Take Apart Inverter15. Turn over the inverter as shown. Using your fingers or a flatblade screwdriver, remove the gray plasti

iMac G5 (20-inch) Take Apart - Inverter Replacing the Inverter 1. Remove the replacement inverter from its packaging. Note: The inverter board and t

36 - iMac G5 (20-inch) Take Apart Inverter4. Turn over the inverter and cover. Pull the inverter cables up into the slot on the inverter cover as

iMac G5 (20-inch) Take Apart - Inverter6. Lower the cable cover, pressing down steadily until the tabs lock the cover into place. 7. Important: Be car

2 - iMac G5 (20-inch) Take Apart General Information Important Things to Know 1. All customer removable screws are brass colored (except for some

38 - iMac G5 (20-inch) Take Apart Inverter8. Connect the inverter cables, connecting the larger connector first. Note: The connectors are keyed, and

iMac G5 (20-inch) Take Apart - Inverter10. Connect the black cable to the white connector on the side of the hard drive. 11. Install the gray plastic

40 - iMac G5 (20-inch) Take Apart Inverter12. Tuck the inverter cables along the edge of the hard drive and next to the memory tabs.13. Replace the

iMac G5 (20-inch) Take Apart - Inverter14. If you are replacing the back cover, turn the middle case screw counter clockwise about five revolutions. Th

42 - iMac G5 (20-inch) Take Apart Fans, UpperFans, UpperTools Required• Phillips #2 screwdriver or Torx-8 (some models have torx screws on the fan)•

iMac G5 (20-inch) Take Apart - Fans, UpperRemoving the Fans1. Locate the fan duct near the hard drive and fan. Depending on the type of screws present

44 - iMac G5 (20-inch) Take Apart Fans, Upper3. Depending on the type of screws present (Torx 8 or Phillips #2), loosen the two fan screws. Note: Yo

iMac G5 (20-inch) Take Apart - Fans, Upper5. Lift the fan out of the computer.6. If you are replacing the fan, remove the screws from the fan grommets

46 - iMac G5 (20-inch) Take Apart Fans, Upper9. Disconnect the fan cable from the connector on the logic board. Pull on the black connector, not on

iMac G5 (20-inch) Take Apart - Fans, UpperReplacing the Fans 1. Connect the fan cable to the logic board. Route the cable under the black hard drive c

iMac G5 (20-inch) Take Apart - Removing the Back Cover Removing the Back Cover Tools Use the screwdriver provided, or a Phillips #1 screwdriver Part

48 - iMac G5 (20-inch) Take Apart Fans, Upper3. Route the fan cable around the side of the fan you just replaced. Connect the fan cable to the logic

iMac G5 (20-inch) Take Apart - Fans, Upper5. Replace the two screws connecting the video cable to the logic board and place the video cable under the

50 - iMac G5 (20-inch) Take Apart Memory (DIMMs)Memory (DIMMs)About iMac G5 Memory• iMac G5 computers work with memory modules (DIMMs) that meet all

iMac G5 (20-inch) Take Apart - Memory (DIMMs)Part Location

52 - iMac G5 (20-inch) Take Apart Memory (DIMMs)Removing the Memory1. Important: Ground yourself. Touch the metal surface (as shown below) on the in

iMac G5 (20-inch) Take Apart - Memory (DIMMs)Replacing the Memory1. Remove the replacement memory module from its packaging.2. Important: The DIMM lat

54 - iMac G5 (20-inch) Take Apart Logic BoardLogic BoardTools • Phillips #2 screwdriver • Torx-10• Torx-6• Flat blade screwdriver• Screw tray or equ

iMac G5 (20-inch) Take Apart - Logic BoardPart Location

56 - iMac G5 (20-inch) Take Apart Logic BoardRemoving the Logic Board1. Remove the air deflector located above the I/O ports. There are no screws, it

iMac G5 (20-inch) Take Apart - Logic Board3. Using a T-8 screwdriver, remove the two fan duct screws and lift the duct off the logic board. Note: Thes

4 - iMac G5 (20-inch) Take Apart Removing the Back Cover Procedure 1. Turn your computer off by choosing Shut down from the Apple ( K ) menu.2. Di

58 - iMac G5 (20-inch) Take Apart Logic Board5. On the left side of the board:• use a T-6 screwdriver to remove the two screws on the Airport Extre

iMac G5 (20-inch) Take Apart - Logic Board6. Using the T-6 screwdriver, remove the two modem screws 7. Lift the modem straight up and off the logic bo

60 - iMac G5 (20-inch) Take Apart Logic Board8. Using a T-6 screwdriver, remove the two screws on the Bluetooth board. 9. Carefully disconnect the B

iMac G5 (20-inch) Take Apart - Logic Board10. Use a needlenose pliers to disconnect the three connectors near the bottom left corner of the midplane.

62 - iMac G5 (20-inch) Take Apart Logic Board12. Important: Before removing the board, position the DIMM latches into the locked position (closed).

iMac G5 (20-inch) Take Apart - Logic BoardReplacing the Logic Board1. Remove the replacement logic board from its packaging.2. Locate the cleaning wip

64 - iMac G5 (20-inch) Take Apart Logic Board4. Add 1 1/2 to 2 syringes of thermal grease to the U3 chip to ensure sufficient cooling. Spread the pa

iMac G5 (20-inch) Take Apart - Logic Board7. Check again that the light pipe is in position before lowering the logic board into place 8. Important: T

66 - iMac G5 (20-inch) Take Apart Logic Board10. Important: Using a T-10 screwdriver, replace the logic board screws. Install the screws in the numb

iMac G5 (20-inch) Take Apart - Logic Board11. Connect the three cables (speakers, fan, and microphone) in the bottom left corner of the midplane. 12.

iMac G5 (20-inch) Take Apart - Removing the Back Cover4. Locate the three case screws circled below. You may have to lift the metal foot to locate th

68 - iMac G5 (20-inch) Take Apart Logic Board13. Replace the Bluetooth board and the two T-6 screws. 14. Connect the modem cable to the modem board.

iMac G5 (20-inch) Take Apart - Logic Board15. Connect the modem to the logic board and replace the two modem screws. 16. Place the AirPort card guide

70 - iMac G5 (20-inch) Take Apart Logic Board17. Connect the hard drive data and the hard drive power cables on the left side. Next, connect the the

iMac G5 (20-inch) Take Apart - Logic Board19. Connect the four connectors (two fan cables and two hard drive cables) and replace the two screws on the

72 - iMac G5 (20-inch) Take Apart Logic Board21. Replace the memory. 22. Replace the optical drive.23. Replace the back cover.

iMac G5 (20-inch) Take Apart - Power SupplyPower SupplyTools Required• Use the screwdriver provided, or a Phillips #1 screwdriver, preferably with a m

74 - iMac G5 (20-inch) Take Apart Power SupplyRemoving the Power Supply1. Ground yourself. Touch the metal surface (as shown below) on the inside of

iMac G5 (20-inch) Take Apart - Power Supply2. Locate the power supply shown in the picture below.3. Remove the screw on the far right and loosen the o

76 - iMac G5 (20-inch) Take Apart Power Supply4. Disconnect the power supply cable by pressing the connector release tab and using a wide, flat blade

iMac G5 (20-inch) Take Apart - Power Supply6. To unlatch the power supply, tighten the middle case screw by turning it clockwise five to eight revoluti

6 - iMac G5 (20-inch) Take Apart Replacing the Back Cover Replacing the Back Cover Tools Use the screwdriver provided, or a Phillips #1 screwdrive

78 - iMac G5 (20-inch) Take Apart Power Supply8. Tilt up the power supply until it clears the edge of the main circuit board. Lift it out of the com

iMac G5 (20-inch) Take Apart - Power SupplyReplacing the Power Supply1. Remove the replacement power supply from its packaging. 2. Replace the power s

80 - iMac G5 (20-inch) Take Apart Power Supply4. Connect the black power supply connector and tighten the two captive screws (circled), turning them

iMac G5 (20-inch) Take Apart - Power Supply6. Turn the middle case screw counterclockwise about five revolutions. This step prepares the back cover to

82 - iMac G5 (20-inch) Take Apart AirPort Extreme CardAirPort Extreme CardOnly the AirPort Extreme Card may be installed in the iMac G5. Older AirPo

iMac G5 (20-inch) Take Apart - AirPort Extreme CardRemoving the AirPort Extreme Card1. Ground yourself. Touch the metal surface (as shown below) on th

84 - iMac G5 (20-inch) Take Apart AirPort Extreme Card2. Locate the AirPort Extreme card.3. Disconnect the antenna cable from the end of the install

iMac G5 (20-inch) Take Apart - AirPort Extreme Card4. Pull the tab on the card to remove the card from the AirPort card guide.Important: Return this A

86 - iMac G5 (20-inch) Take Apart AirPort Extreme CardReplacing the AirPort Extreme Card1. Remove the replacement AirPort Extreme card from its pack

iMac G5 (20-inch) Take Apart - AirPort Extreme Card4. Make sure the AirPort Extreme card is flush with the plastic AirPort card guide.

iMac G5 (20-inch) Take Apart - Replacing the Back Cover3. Lower and press the cover into place until it fits snugly on the computer. 4. Tighten the ca

88 - iMac G5 (20-inch) Take Apart AirPort Extreme Card HolderAirPort Extreme Card HolderTools Required• Torx T6 screwdriver, preferably with a magne

iMac G5 (20-inch) Take Apart - AirPort Extreme Card HolderRemoving the AirPort Extreme Card Holder1. Remove the two identical T6 screws from the top o

90 - iMac G5 (20-inch) Take Apart AirPort Extreme Card HolderReplacing the AirPort Extreme Card Holder1. Route the AirPort antenna cable into the ho

iMac G5 (20-inch) Take Apart - BatteryBatteryToolsNo tools are required for this procedure. You may, however, find a flat-blade screwdriver or the nylon

92 - iMac G5 (20-inch) Take Apart BatteryRemoving the Battery1. To access the battery other service modules have to be removed. This procedure will

iMac G5 (20-inch) Take Apart - Battery3. Locate the AirPort Extreme card. The battery is located below the AirPort Extreme card. Note: If an AirPort E

94 - iMac G5 (20-inch) Take Apart Battery5. Pull the tab on the card to remove the card from the AirPort card guide. 6. Reconnect the antenna cable

iMac G5 (20-inch) Take Apart - Battery7. WIth the nylon probe tool, push the battery in the direction of the arrow to free the battery from the metal

96 - iMac G5 (20-inch) Take Apart BatteryReplacing the Battery1. Remove the replacement battery from its packaging.2. Holding the battery positive s

iMac G5 (20-inch) Take Apart - Battery4. Slide the AirPort Extreme card into the slot until it clicks into place. Connect the AirPort antenna cable to