Service Source iMac G5 (17-inch iSight) Updated: 12 April 2007 © 2005 Apple Computer, Inc. All rights reserved.
iMac G5 (17-inch iSight) Contents Take Apart General Information 6 Product View 6 Tools Required 6 What’s New? 7 Orientation 7 Serial Number Location 7 Safety 9 Opening the Computer 10 Access Tool Modification 10 EMI Shielding 13 Lower EMI Shield 14 Access Door and Memory 16 Front Bezel 19 Camera Board 26 Lower EMI Shield 28 IR Board 30 LCD Display 32 TMDS Cable 39 Inverter 42 Speakers 46 CPU Fan 49 Optical Drive 51 Hard Drive 61 DC-DC Board 67 Power Supply 70 ii
Logic Board 74 Optical Drive Fan 82 Hard Drive Fan 84 AC Power Inlet 86 Ambient Light Sensor Board 90 Clutch 94 Wireless Antenna 99 DC Power Cable Camera Cable 103 106 Chassis 110 Rear Housing 114 Troubleshooting General Information 116 Serial Number Location 116 Accessing the Diagnostic LEDs 117 Testing Under Power 123 SMU (System Management Unit) 125 Resetting the SMU (System Management Unit) Ports 126 DDR Memory 126 Symptom Charts 127 How to Use the Symptom Charts Power Issues 128 Verbose Sta
Keyboard 154 Error Beep(s) 155 USB 156 Views iMac G5 (17-inch iSight)—Upper Exploded View 158 iMac G5 (17-inch iSight)—Lower Exploded View 159 Screw Chart 160 iv
Service Source Take Apart iMac G5 (17-inch iSight) © 2005 Apple Computer, Inc. All rights reserved.
General Information Product View 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.
What’s New? 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. Information on handling slot-load optical drives has been added to the optical drive section. Reset PRAM to prevent verbose startup in iMac G5’s with a new logic board.
iMac G5 (17-inch iSight) Take Apart — General Information
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.
Opening the Computer Apple authorized, desktop certified 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.
2. Cut the EMI gasket to the edge of the access card. 3. Using packing tape, or something equivalent, fold the tape over the EMI gasket to attach the gasket to the card.
4. Bend the card at a slight angle at the top to make sure the card makes contact with each latch. 5. Refer to the Front Bezel take-apart procedure for complete instructions.
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, such as the those shown below, with EMI tape.
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 EMI tape (922-4786 or 922-5026) to repair and completely seal the unit.
iMac G5 (17-inch iSight) Take Apart — General Information 15
Access Door and Memory Tools • • • Phillips #2 screwdriver. ESD-safe workstation and mat Soft, clean towel or cloth Preliminary Steps 1. Shut down the computer and unplug all external cables except the power cord. 2. Place a soft, clean towel or cloth on the ESD mat. Grasp the sides of the unit and slowly lay it screen-down on the cloth, with the bottom facing you. 3. Touch the metal memory access cover to discharge any static electricity from your body.
Remove the Access Door and Memory 1. Raise the stand and use a Phillips #2 screwdriver to loosen the two captive screws that secure the memory access door. Remove the access door. Caution: The ambient light sensor is located between the two screws. Don’t mistake the ambient light sensor for a screw. 2. To eject any optional memory, pull out simultaneously the two rings protruding from the memory slot. The memory will poke out from the memory slot. Grasp the memory by its edges only and remove it.
Replace the Memory and Access Door 1. Grasp the memory module by its edges and insert it into the memory slot as shown below. Push the edge of the memory module in gently to lock it in place. Replacement Note: The memory module fits into the slot only one way. When inserted fully, you should hear a slight click and the two pull rings should retract a bit. Do NOT insert the memory by pushing in the pull rings. 2. Position the access door on the rear housing.
Front Bezel Tools This procedure requires the following tools: • Access card tool 922-7172 • Torx T8 screwdriver Preliminary Steps Before you begin, follow steps for removing the access door. Remove the Front Bezel 1. Turn over the unit and place it screen-up on an ESD mat, with the bottom facing toward you. 2. Tilt up the bezel and use a T8 torx screwdriver to remove the three bezel mounting screws.
3. Bending the upper quarter of the access tool card slightly will help engage the latch more securely. Note: Refer to Access Tool Modification in the General Information chapter if the bezel is difficult to open. 4. This picture shows how the access tool works. Pushing the tool up the vent on the rear cover releases the latches on the inside of the front bezel. Refer to the next step for the procedure.
5. Start on the left side (looking from the back of the unit). As you insert the card to disengage the latch, squeeze the top of the bezel, that will help take pressure off of the latch and enable it to open easier. As the bezel releases, pull the bezel away from the rear housing. 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. 6. Repeat step 5 to release the locking latch in the right corner.
7. If the bezel won’t release, pull the bottom of the bezel out a bit and insert the access card again. 8. Repeat step 7 for the left side.
9. Once the access card has been removed, it is safe to open the bezel. Position the unit on an ESD mat, with the bottom facing toward you.. 10. Lift the bottom of the front bezel straight up to remove it, and swing the bezel over onto its top edge so you can disconnect two cables that tether the top of the bezel to the unit. Caution: Make sure the memory eject rings are not protruding from the bezel when you lift it or you could bend or damage the rings.
11. Disconnect the two camera board cables. 12. If replacing a damaged front bezel, also remove the camera board. See the following procedure. Replace the Front Bezel 1. If necessary, replace the camera board. 2. Postion the front bezel near the top edge of the unit and connect the two camera board connectors.
3. Check and make sure no EMI tape interferes with the locking mechanisms when the bezel is installed onto the unit. The locking mechanisms must slide into a gap inside the top edge of the rear housing. 4. Potition the front bezel around the edges of the unit, push in the memory eject rings, and press the bezel onto the rear housing. Note: When pressing the top of the bezel firmly onto the housing you should audibly hear the locking mechanisms latch onto the housing. 5.
Camera Board Tools The only tool required for this procedure is a Phillips #1 screwdriver. Preliminary Steps Before you begin, follow steps for removing the access door and front bezel. Remove the Camera Board 1. Using the Phillips #1 screwdriver, peel back tape as necessary and remove the two camera board mounting screws. 2. Pull the camera board straight out of the lens aperture in the bezel to remove it.
Replace the Camera Board 1. Carefully align and insert the camera lens until it is snug in the bezel aperture. 2. Install the camera board to the bezel with two mounting screws. 3. Replace the front bezel. 4. Replace the access door.
Lower EMI Shield Tools The only tool required for this procedure is a “black stick” (or other nonconductive nylon or plastic flat-blade tool).
Remove the Lower EMI Shield 1. Carefully peel the lower EMI shield off the bottom edge of the rear housing. Use a black stick to help peel back the shield. 2. If replacing a torn or damaged lower EMI shield, peel the lower EMI shield off the bottom edge of the display. Replace the Lower EMI Shield 1. Position the lower EMI shield over the bottom of the unit so that the holes in the shield are properly aligned. 2. Press the sticky, top edge of the EMI shield onto the bottom side of the display panel.
IR Board Tools The only tool required for this procedure is a Torx T6 screwdriver (magnetized).
Remove the IR Board 1. Disconnect the IR cable from the IR board connector. 2. Using a Torx T6 screwdriver, remove the two IR board mounting screws. Remove the IR board from its mounting bracket. Replace the IR Board 1. Install the IR board and two mounting screws onto its mounting bracket. 2. Connect the IR cable to the IR board connector. 3. Replace the lower EMI shield. 4. Replace the front bezel. 5. Replace the access door.
LCD Display Tools Removing the LCD display requires using the following tools: • Torx T10 screwdriver (magnetized) • Torx T6 screwdriver (magnetized) • Black stick (or other nonconductive nylon or plastic flat-blade tool) Preliminary Steps Before you begin, follow steps for removing the following: • Access door • Front bezel • Lower EMI shield Part Location iMac G5 (17-inch iSight) Take Apart — Display Panel-32
Remove the LCD Display 1. Using the black stick, carefully peel back the black, EMI shielding tape from the left and right top edges of the display panel. 2. Disconnect the inverter cable from the connector on the logic board. 3. Using a Torx T6 screwdriver, remove the two TMDS connector mounting screws. Disconnect the TMDS cable from the logic board.
4. Using a Torx T10 screwdriver, remove the four panel mounting screws. 5. To remove the display panel, grasp it securely with both hands and pivot it completely over, as shown, then carefully peel the top edge of the panel away from the EMI skirt.
Note: If replacing a bad LCD display, you will also need to remove the lower EMI shield (if still attached), the display panel mounting brackets, and the TMDS cable as follows. 6. If attached, peel the lower EMI shield off the bottom edge of the display panel.
7. Using a torx T8 screwdriver, remove two screws from the left side panel mounting bracket. 8. Using a torx T8 screwdriver, push the tape aside and remove the two mounting screws from the right side panel bracket as shown below.
9. Peel back the tape where shown below, and disconnect the two inverter-to-display cable connectors. 10. Remove the TMDS cable from the rear of the display. Replace the LCD Display 1. If necessary, replace the TMDS cable on the rear of the display panel. 2. If necessary, connect the two inverter-to-display cable connectors and tape them to the back of the display panel. 3. If necessary, replace the right panel mounting bracket on the display panel with two screws. 4.
5. Push aside any cables that could interfere with the display mounting brackets when lowered into position. 6. Make sure the inverter cable extends beyond the bottom of the display panel, and install the panel with the mounting bracket screw holes and the screw mounts aligned. 7. Secure the panel with four mounting screws. 8. Connect the inverter cable connector. 9. Connect the TMDS cable connector and secure it with two screws. 10.
TMDS Cable Tools Removing the TMDS cable requires using the following tools: • Torx T8 screwdriver (magnetized) Preliminary Steps Before you begin, follow steps for removing the following: • Access door • Front bezel • Lower EMI shield • LCD Display Part Location iMac G5 (17-inch iSight) Take Apart — TMDS Cable 39
Remove the TMDS Cable 1. Locate the TMDS cable on the back side of the display panel, and remove the four pieces of tape that secure the cable to the panel.
2. Pinch together the connector locking levers, and disconnect the TMDS cable connector. Replace the TMDS Cable 1. Position the TMDS cable on the back of the display panel as shown in the Part Location photo above. 2. Connect the TMDS cable connector. When connected correctly the locking levers will secure the connector and it cannot be disconnected without depressing the levers. 3. Secure the TMDS cable to the panel with four strips of tape. 4. Replace the display panel. 5.
Inverter Tools Removing the inverter requires using a flat-blade screwdriver Preliminary Steps Before you begin, follow steps for removing the following: • Access door • Front bezel • Lower EMI shield • LCD Display iMac G5 (17-inch iSight) Take Apart — Inverter42
Remove the Inverter 1. Remove two pieces of tape that secure the inverter cables to the back of the display panel, and disconnect the inverter connectors where shown. 2.
3. Using a flat-blade screwdriver as shown, pry up the inverter to remove it from inside the right side display panel mounting bracket. 4. Remove the inverter cable from the hole in the right mounting bracket to separate the inverter and bracket.
Replace the Inverter 1. Insert the inverter cable through a hole at the back center of the right mounting bracket, and press the sticky side of the replacement inverter onto the back edge of the bracket. Inverter should look as shown below. 2. Connect the inverter-to-display cables and tape them to the back of the display panel. 3. Replace the display panel. 4. Replace the lower EMI shield. 5. Replace the front bezel. 6. Replace the access door.
Speakers Tools Removing the speaker requires using the following tools: • Torx T10 screwdriver (magnetized) • Torx T6 screwdriver (magnetized) Preliminary Steps Before you begin, follow steps for removing the following: • Access door • Front bezel • Lower EMI shield • LCD Display Part Location iMac G5 (17-inch iSight) Take Apart — Speaker
Remove the Speakers 1. Using a T10 torx screwdriver, remove the mounting screws from the left and right speakers. Replacement Note: The longer of the two speaker mounting screws is used to secure the left speaker; the shorter screw secures the right speaker. 2. Using a T6 torx screwdriver, remove the screw that secures the IR board mounting bracket to the logic board. Remove the IR mounting bracket and attached gold bracket.
3. Lift the left speaker straight up to remove it. Replacement Note: Note the location and positioning of the speaker cable for reinstallation later. 4. Lift the right speaker straight up and disconnect the speaker cable connector from the logic board. Replace the Speakers 1. Install the speakers and route the speaker wire as shown below. 2. Connect the speaker cable connector to the logic board, 3. Secure the right speaker with the smaller of the two mounting screws. 4.
CPU Fan Tools No tools are required to remove the CPU fan.
Remove the CPU Fan 1. Disconnect the CPU fan cable from the logic board. 2. Lif the CPU fan straight up to remove it from three mounting posts. Replace the CPU Fan 1. Align the CPU fan with the three mounting posts in the rear housing, and push it straight down onto the posts. 2. Connect the CPU fan cable to the logic board connector. 3. Replace the speakers. 4. Replace the display panel. 5. Replace the lower EMI shield. 6. Replace the front bezel. 7. Replace the access door.
Optical Drive Tools Removing the optical drive requires using the following tools: • Torx T10 screwdriver (magnetized) • Torx T6 screwdriver (magnetized) • Needlenose pliers (with teeth) Preliminary Steps Before you begin, follow steps for removing the following: • Access door • Front bezel • Lower EMI shield • LCD Display Part Location iMac G5 (17-inch iSight) Take Apart — Optical Drive 51
Remove the Optical Drive 1. Disconnect the sensor cable from the temperature sensor on top of the optical drive. 2. Using a T10 torx screwdriver, remove the screw and metal flex cable mounting bracket. Disconnect the optical drive flex cable from the logic board connector.
3. Note: Make sure to use a needlenose pliers with teeth to remove the optical drive. The pliers must have a textured surface to properly grasp the optical drive release tabs. 4. Locate the black tabs at each side of the plastic optical drive mounting bracket. Starting at the release tab that is furthest from the logic board, grasp the tab with needlenose pliers, and flex the tab toward the optical drive flexible cable.
Caution: Never press down on or grasp the body (silver) of the optical drive when removing or installing it. Depressing the body of the optical drive could damage the mechanism. Grasp the optical drive by its mounting bracket only. 5. Warning: iMac main logic boards returned with physical damage such as scratches, fractures, or broken or missing components caused by improper servicing may be classified as customer abuse.
6. If replacing a bad optical drive, use a T6 torx screwdriver to remove two flex cable mounting screws. Disconnect and keep the flex cable for installation on the replacement drive. 7. If replacing a bad optical drive, also remove the temperature sensor from the top of the drive. Discard the sensor—the replacement drive comes with a new sensor already installed.
Handling Slot-Load Optical Drives Follow the instructions in this section carefully. This procedure shows how to handle slot-load optical drives when they are outside the computer. • Observe ESD (electrostatic discharge) guidelines when handling optical drives.
• Handle the drive only by the sides and back edge. • Do not touch the front of the drive.
• Do not press on the drive or lift it by the top and bottom cover. • Do not handle the drive by the gull wing edge only.
• When storing optical drives, use approved packaging boxes. Never stack loose drives. • When returning a defective optical drive, use the original packaging and an antistatic bag. Pack only one drive per box.
Replace the Optical Drive 1. If necessary, install the flex cable to the optical drive with two screws. 2. Insert the optical drive bezel-end-first into the access hole in the housing. Be sure to align the two guide holes in the front bezel with guide posts at each end of the drive access hole.
Hard Drive Tools Removing the hard drive requires using the following tools: • Torx T8 screwdriver (magnetized) • Flat-blade screwdriver Preliminary Steps Before you begin, follow steps for removing the following: • Access door • Front bezel • Lower EMI shield • LCD Display Part Location iMac G5 (17-inch iSight) Take Apart — Hard Drive 61
Remove the Hard Drive 1. Disconnect the sensor cable from the temperature sensor on top of the hard drive. 2. Remove the temperature sensor from the drive. Transfer the sensor to the replacement hard drive.
3. Position yourself at the top side of the unit closest to the hard drive mounting bracket. 4. Grasp the mounting bracket as shown, and push in and down on the edge of the bracket until you feel it release. If the bracket doesn’t release, use your left hand to hold it in this depressed position, and with your right hand use a flat-blade screwdriver to pry up on the bottom of the mounting bracket to help release it.
5. Disconnect the hard drive power and data cables. . Note: If you are replacing a defective hard drive continue with the procedure to transfer the temperature sensor, mounting bracket, and mounting pins to the replacement drive.
7. Using a T8 torx screwdriver, remove two screws and the mounting bracket from the drive. 8. Using a T8 torx screwdriver, remove two mounting pins from the other side of the drive.
Replace the Hard Drive 1. Install two mounting pins in the bottom side of the hard drive mounting bracket. 2. Install the mounting bracket to the top of the hard drive with two screws. 3. Install the temperature senor on the hard drive. Use the double-stick tape enclosed with the replacement hard drive to attach the sensor. 4. Connect the hard drive power and data cables. 5. Insert the hard drive mounting pins and position the drive on the chassis.
DC-DC Board Tools Removing the optical drive requires using the following tools: • Torx T10 screwdriver (magnetized) Preliminary Steps Before you begin, follow steps for removing the following: • Access door • Front bezel • Lower EMI shield • LCD Display Part Location iMac G5 (17-inch iSight) Take Apart — DC-DC Board
Remove the DC-DC Board 1. Disconnect the power supply cable and the DC power cable from the DC-DC board.
2. Using a T10 torx screwdriver, remove the two self-tapping screws from the bottom corners of the DC-DC board. The lower left mounting screw is beneath the power supply cable. 3. Using a T10 torx screwdriver, remove the machine screw from the upper right corner of the board. Lift the board straight up to remove it. Replace the DC-DC Board 1. Position the DC-DC board and install the machine screw in upper right corner 2.
Power Supply Tools Removing the optical drive requires using the following tools: • Torx T10 screwdriver (magnetized) Preliminary Steps Before you begin, follow steps for removing the following: • Access door • Front bezel • Lower EMI shield • LCD Display • Hard drive Part Location iMac G5 (17-inch iSight) Take Apart — Power Supply
About the Power Supply 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.
Remove the Power Supply 1. Using a T10 torx screwdriver, remove the three self-tapping screws from both top corners and the lower left corner of the DC-DC board. Then remove the machine screw from the lower right corner of the board. Replacement Note: When installing the mounting screws in the power supply, install the machine screw first in the lower right corner of the power supply. Then install the three selftapping screws.
2. Disconnect the power supply cable. 3. Pull out the power supply-to-TMDS cable from beneath the chassis. Disconnect the connectors. Replace the Power Supply 1. Postion the power supply loosely in its mounting location. 2. Route the power supply end of the power supply-to-TMDS cable beneath the chassis. Pull out the TMDS end of the power supply-to-TMDS cable and connect the two connectors. Tuck the cable beneath the chassis and away from the hard drive bay. 3. Connect the DC power cable. 4.
Logic Board Tools Removing the optical drive requires using the following tools: • Torx T10 screwdriver (magnetized) • Torx T6 screwdriver (magnetized) Preliminary Steps Before you begin, follow steps for removing the following: • Access door • Front bezel • Lower EMI shield • IR Board • LCD Display • Speakers • CPU Fan Part Location iMac G5 (17-inch iSight) Take Apart — Logic Board 74
Remove the Logic Board 1. Using a T10 torx screwdriver, remove the screw and flex cable mounting bracket. Disconnect the optical drive flex cable from the logic board connector 2. Disconnect the large, hard drive data cable from the center of the logic board.
3. Disconnect the following cables from connectors on the logic board. Connectors are shown starting in the lower left corner, proceeding clockwise.
4. Using a T6 torx screwdriver, remove two screws and disconnect the AirPort-Bluetooth combo card. Also disconnect the AirPort and Bluetooth cables from the card.
5. Remove the seven remaining logic board mounting screws. First remove the three selftapping screws circled below, and then remove the four machine screws, shown with double-yellow circles below. 6. Lift the logic board just enough to access the power supply cable connector on the underside of the logic board. Disconnect the cable and remove the logic board.
. Note: Handle the logic board carefully; support the board as shown in one of the photographs below.
Replace the Logic Board 1. Replacement Note: Handle the logic board carefully; support the board as shown in one of the photographs below.
2. Connect the power supply cable to the connector on the underside of the logic board. 3. Pull all cables up and away from the logic board bay and gently place down the logic board so that all screw holes are aligned with screw mounts in the chassis. Replacement Note: The logic board should rest on the screw mounts without any binding or bowing—if it doesn’t, adjust any cables that are interfering with the logic board. 4.
Optical Drive Fan Tools No tools are required to remove the optical drive fan.
Remove the Optical Drive Fan 1. Lift the optical drive fan straight up and off three mounting posts. Replace the Optical Drive Fan 1. Make sure the hard drive power cable and camera board cable are routed beneath the optical drive fan as shown above. Align and install the optical drive fan on three mounting posts. Push it down snug onto the posts. 2. Replace the logic board. 3. Replace the CPU fan. 4. Replace the speakers. 5. Replace the display panel. 6. Replace the IR Board. 7.
Hard Drive Fan Tools No tools are required to remove the optical drive fan.
Remove the Hard Drive Fan 1. Lift the hard drive fan straight up and off three mounting posts. Replace the Hard Drive Fan 1. Make sure the hard drive fan cable is routed up toward the hard drive and beneath the mounting bracket of the fan. Align and install the hard drive fan on three mounting posts. Push it down snug onto the posts. 2. Replace the logic board. 3. Replace the CPU fan. 4. Replace the speakers. 5. Replace the display panel. 6. Replace the IR Board. 7.
AC Power Inlet Tools Removing the AC power inlet requires using the following tools: • Torx T10 screwdriver (magnetized) Preliminary Steps Before you begin, follow steps for removing the following: • Access door • Front bezel • Lower EMI shield • IR Board • LCD Display • Speakers • CPU Fan • Logic board • Hard drive fan Part Location iMac G5 (17-inch iSight) Take Apart — AC Power Inlet 86
Remove the AC Power Inlet 1. Using a torx T10 screwdriver, remove the three self-tapping screws from the power inlet. 2. Using a tox T10 screwdriver, remove the machine screw from the power inlet ground cable.
3. Disconnect the power inlet-to-power supply cables and unlace the power inlet cable from beneath the chassis. 4. Peel up the EMI tape that secures the AC power inlet to the rear housing and remove the power inlet.
Replace the AC Power Inlet 1. Install the AC power inlet on the rear housing screw mounts with three self tapping screws. 2. Install the power inlet ground cable to the chassis with a machine screw. 3. Route the power inlet cable beneath the chassis as shown in the photo above, and connect it to the power supply. 4. Using EMI tape, securely tape the top and bottom edges of the AC power inlet to the rear housing. 5. Replace the hard drive fan. 6. Replace the logic board. 7. Replace the CPU fan.
Ambient Light Sensor Board Tools No tools are required to remove the ambient light sensor board.
Remove the Ambient Light Sensor Board 1. Remove the rubber bumper from between the chassis and the ALS board. 2. Peel the ALS off the inside bottom of the rear housing. Replace the Ambient Light Sensor Board 1. Press the sticky side of the ALS board to the bottom inside edge of the rear housing. 2. Install the rubber bumper between the back of the ALS board and the chassis. 3. Replace the logic board. 4. Replace the CPU fan. 5. Replace the speakers. 6. Replace the display panel. 7.
iMac G5 (17-inch iSight) Take Apart — ALS Board 92
iMac G5 (17-inch iSight) Take Apart — ALS Board 93
Clutch Tools Removing the clutch requires using the following tools: • Torx T10 screwdriver (magnetized) Preliminary Steps Before you begin, follow steps for removing the following: • Access door • Front bezel • Lower EMI shield • IR Board • LCD Display • Speakers • CPU fan • Logic board • Optical drive fan • Hard drive fan • Hard drive iMac G5 (17-inch iSight) Take Apart — Clutch 94
Part Location iMac G5 (17-inch iSight) Take Apart — Clutch 95
Remove the Clutch 1. Carefully peel back the EMI tape and pull the cover straight off the clutch. 2. Using a T10 torx screwdriver, remove the four clutch mounting screws.
3. Stand up the unit, and peel up the silk tape to access the four clutch-to-stand mounting screws. . 4. Using a T10 torx screwdriver, remove the four clutch-to-stand screws. Remove the clutch and cover from the stand. 5.
Replace the Clutch 1. Make sure the stand is erect and the end of the stand is inserted through the mounting hole in the rear housing. 2. Position the clutch on the stand as shown, with the springs at bottom right. Install the four long, clutch-to-stand mounting screws.. 3. Adjust the clutch so that its chassis mounting holes align, and install the four machine screws that secure the clutch to the chassis. 4. Replace the hard drive. 5. Replace the hard drive fan. 6. Replace the optical drive fan.
Wireless Antenna Tools Removing the wireless antenna requires using the following tools: • Flat-blade screwdriver • Black stick (or other nonconductive nylon or plastic flat-blade tool) Preliminary Steps Before you begin, follow steps for removing the following: • Access door • Front bezel • Lower EMI shield • IR Board • LCD Display • Speakers • CPU fan • Logic board • Optical drive fan • Optical drive iMac G5 (17-inch iSight) Take Apart — Wireless Antenna 99
Part Location Remove the Wireless Antenna 1. Carefully peel back the EMI skirt and backing from the top right inside corner of the rear housing as shown below. Peel back just enough EMI backing to access the antenna cable.
2. Remove two pieces of tape that secure the antenna cable to the rear housing. Remove the connectors end of the antenna cable from the access hole in the EMI skirt. 3. Using a flat-blade screwdriver, pry the antenna off the rear housing.
Replace the Wireless Antenna 1. Locate the antenna mounting channel inside the top right corner of the rear housing, and position the antenna in the channel. Compress the sticky side of the antenna to the housing until securely fastened. 2. Route the antenna cable as shown in the photo above, and insert the connectors end of the cable through the access hole in the EMI skirt. Leave about 2 inches of cable extending from the skirt. 3. Secure the antenna cable to the housing with two pieces of tape. 4.
DC Power Cable Tools No tools are required to remove the DC power cable.
Part Location Remove the DC Power Cable 1. Remove tape that secures the DC power cable to the rear housing, and remove the DC power cable.
Replace the DC Power Cable 1. Route the DC power cable as shown above. Tape the DC power cable and the camera cable to the rear housing where shown below. 2. Replace the hard drive. 3. Replace the optical drive. 4. Replace the optical drive fan. 5. Replace the logic board. 6. Replace the CPU fan. 7. Replace the speakers. 8. Replace the display panel. 9. Replace the IR Board. 10. Replace the lower EMI shield. 11. Replace the front bezel. 12. Replace the memory access door.
Camera Cable Tools No tools are required to remove the camera cable.
Part Location Remove the Camera Cable 1. Remove tape that secures the camera cable to the rear housing. Remove the two-headed end of the cable from the access hole in the upper EMI skirt, and remove the camera cable.
Replace the Camera Cable 1. Insert the two-headed end of the camera cable through the access hole in the upper EMI skirt. 2. Replace the EMI grounding tape as shown below. The metallic tape should secure the cable to the metal chassis.
3. Route the camera cable as shown, and tape the camera cable and DC power cable to the rear housing as shown below. 4. Replace the hard drive. 5. Replace the optical drive. 6. Replace the optical drive fan. 7. Replace the logic board. 8. Replace the CPU fan. 9. Replace the speakers. 10. Replace the display panel. 11. Replace the IR Board. 12. Replace the lower EMI shield. 13. Replace the front bezel. 14. Replace the memory access door.
Chassis Tools Removing the chassis requires using the following tools: • Torx T10 screwdriver (magnetized) Preliminary Steps Before you begin, follow steps for removing the following: • Access door • Front bezel • Lower EMI shield • IR Board • LCD Display • Speakers • CPU fan • Logic board • Optical drive fan • Hard drive fan • Optical drive • Hard Drive • DC-DC board • Power supply • AC power inlet • Clutch iMac G5 (17-inch iSight) Take Apart — Chassis 110
Part Location Remove the Chassis 1. Remove the foam cushion from the chassis.
Using a T10 torx screwdriver, remove 10 self-tapping screws from the chassis, and remove the chassis from the rear housing. Replace the Chassis 1. Position the chassis on the rear housing as shown and install 10 self-tapping mounting screws. 2. Replace the foam cushion on the chassis where shown in the photo above. 3. Replace the AC power inlet. 4. Replace the power supply. 5. Replace the DC-DC board. 6. Replace the hard drive. 7. Replace the optical drive. 8.
14. Replace the lower EMI shield. 15. Replace the front bezel. 16. Replace the memory access door.
Rear Housing Tools No tools are required to remove the rear housing in addition to those referenced below.) Remove and Replace the Rear Housing To remove the rear housing, follow steps for removing the parts below. Reverse these steps to replace the rear housing.
Service Source Troubleshooting iMac G5 (17-inch iSight) © 2005 Apple Computer, Inc. All rights reserved.
General Information Serial Number Location iMac G5 (iSight) serial numbers are located on the bottom of the computer stand.
Accessing the Diagnostic LEDs The iMac G5 (17-inch iSight) has four built-in diagnostic LEDs on the main logic board that can help you troubleshoot the computer. Follow the steps below to access the LEDs. 1. Shut down the computer and disconnect all cables except the power cord. 2. Place a soft, clean towel or cloth on the desk or flat surface. Grasp the sides of the unit and slowly lay it screen-down on the cloth, with the bottom facing you. 3.
4. Turn over the unit and place it screen-up, with the bottom facing toward you. 5. Tilt up the front bezel and use a T8 torx screwdriver to remove the three bezel mounting screws. 6. Stand up the unit. Using the plastic access card, unhook the bezel locking mechanism in one upper corner of the front bezel, and pull the bezel slightly away from the rear housing. Note: You must Insert the access card through the vent in the rear housing as shown below, and push it up and back until the latch releases.
7. Repeat step 6 to release the locking mechanism in the opposite upper corner. 8. Lay the unit screen-up on an ESD mat, with the bottom facing toward you. Lift up the top of the bezel and pull it slightly toward you to separate it from the top of the rear housing.
9. Lift the front bezel straight up to remove it. Then swing the bezel upright onto its top edge so you can disconnect two cables that tether the bezel to the rest of the unit. Caution: Make sure the memory eject rings are not protruding from the bezel when you lift it or you could bend or damage the rings. Also, do not use excessive force when removing the front bezel or you could break the locking mechanisms.
11. To protect the computer from electrostatic discharge, ground yourself by touching the metal frame around the display panel. Caution: Always discharge static electricity before you touch any parts or install any components inside the computer. 12. Carefully peel the lower EMI shield off the bottom edge of the rear housing. Use a black stick to help peel back the shield. 13. Locate and peel up the small piece of black tape near the bottom of the logic board.
14. Under the black tape you’ll see the four labelled diagnostic LEDs shown below. • LED 1: Indicates that trickle voltage from the AC power inlet to the power supply has been detected. This LED will be ON when the computer is turned off and your power supply is working correctly. • LED 2: Indicates that the main logic board has detected proper power from the power supply when the computer is turned on. This LED will be ON when the computer is turned on and the power supply is working correctly.
Testing Under Power Using the diagnostic LEDs to check for power issues reuquires powering on the system with the diagnostic LEDs visible. To access the Diagnostic LEDs, follow the preceding steps under “Accessing the Diagnostics LEDs.” Never remove components not included in the “Accessing the Diagnostic LEDs” procedure when testing the system under power.
4. Press the power button at the rear of the unit. 5. Observe the LEDs, which will come on indicating the computer status as indicated below: LED 1 Operation: Should turn on as soon as the power cord is plugged into the system, indicating that line voltage is present and basic power supply functionality is OK. LED 2 Operation: Should turn on as soon as the power button is pressed, indicating the remainder of the power supply system is functioning.
SMU (System Management Unit) The iMac G5 (iSight) uses an advanced system management unit (SMU) to manage the thermal and wattage conditions, while keeping the acoustic noise to a minimum. The SMU controls the fans and regulates the speeds to run each fan.
Ports The iMac G5 (17-inch iSight) ports are shown below. DDR Memory iMac G5 (17-inch iSight) computers work with memory modules (DIMMs) that meet all of these criteria: PC3200, 2.5V, unbuffered, 8-byte, nonparity, 184-pin, 533Mhz DDR2 SDRAM. iMac G5 (17-inch iSight) comes with 512 MB of memory soldered to the main logic board, and includes one user-configurable RAM slot. User-configurable memory can be installed by the customer by removing the memory access door on the bottom edge of the unit.
Symptom Charts How to Use the Symptom Charts The Symptom Charts included in this chapter will help you diagnose specific symptoms related to the product. Because cures are listed on the charts in the order of most likely solution, try the cures in the order presented. Verify whether or not the product continues to exhibit the symptom. If the symptom persists, try the next cure. Note: If a cure instructs you to replace a module, reinstall the original module before you proceed to the next cure.
Power Issues No Power. The iMac G5 will not turn on. The display has no picture or color and no sounds can be heard coming from the fan or hard drive. 1. Verify that the power outlet is good. Plug a different device into the socket to ensure there is power, or plug the iMac G5 into another outlet. 2. Check the power cord. Use a known good power cord. 3. Check the connection of the power cord on both ends.
7. Plug the power cord into the iMac G5 and into the AC outlet. Check to see if diagnostic LED #1 is On or Off. LED #1 is On: This indicates that the AC power inlet and AC-to-DC power supply is getting good power from the AC outlet, and the DC-DC board is receiving 12VDC. Go to step 8. LED #1 is Off: Inspect for loose or disconnected cables. If cables are connected, your AC-toDC power supply or AC power inlet may need to be replaced.
8. Turn the computer on by pressing the power button on the rear of the case. Go to the next step. 9. Does the computer start up normally after pressing the power button? Yes: Press and hold the power button until the computer shuts off. Unplug the power cord from the iMac, and replace the front bezel. Return the computer to the upright position and connect the power cord. Press the power button to turn on the computer. Make sure the computer starts up properly.
Audible buzzing, whining, or ticking noise The iMac G5 (iSight) contains several mechanical devices such as motors and fans that may make audible buzzing, ticking, or whining noises when they are operating in a normal manner. The sounds will vary depending on how the system is used. When troubleshooting abnormal noises try the following: 1. Verify that the computer is running a supported version of the Mac OS X operating system.
No Video The computer will turn on, but the display has no picture or color. The boot chime, the fan, and hard drive activity can be heard. 1. Check if the computer is sleeping. Press the space bar to wake the computer from sleep mode. 2. Did the computer wake from sleep? Yes: Put the computer to sleep from the Apple menu and wake the computer again to test the settings. Check the Energy Saver setting to see when the computer has been designated to sleep. No: Continue to the next step. 3.
8. Turn on the computer by pressing the power button. 9. When the computer starts up, LED 2 will light, indicating the power supply is functioning properly. If LED 2 does not light, refer to the “No Power” troubleshooting earlier in this chapter. 10. LED 3 will light last, indicating that the logic board and LCD display assembly have communicated and the display is ready to receive video. Does LED 3 come on? Yes: This indicates that your logic board is working correctly to produce video.
LCD Display is tinted another color. 1. Reset the parameter RAM. - While the computer is off, with your left hand, hold down the Apple key, the option key next to it, and the letter R. When you have them all pressed push the power button with your right hand and then quickly move that hand to hold down the letter P. Keep the four keys pressed while the computer starts up. - Make sure you hold down the four keys (P-R-Command-Option) while the computer starts up.
LCD Display When displaying a single color over the screen area, the LCD panel shows one or more pixels that are not properly lit Active-matrix LCD technology uses rows and columns of addressable locations (pixels) that render text and images on screen. Each pixel location has three separate subpixels (red, green, and blue) that allow the image to be rendered in full color. Each subpixel has a corresponding transistor responsible for turning the subpixel on or off.
Hard Drive In a hard drive failure, the computer fails to boot to the desktop and may display a flashing question mark, or an alternating question mark and Mac OS (face or a folder) Note: When troubleshooting hard drive problems it is a good idea, if possible, to back up any important data. Some troubleshooting steps may require erasing the contents of the hard drive. 1. Boot from the system CD that came with the computer, and open Disk Utility.
Optical Drive CDs or DVDs don’t show up on the Desktop. 1. Select Preferences from the Finder menu and make sure the option to show CDs, DVDs and iPods is checked: in the General window as shown below.
2. Select System Preferences from the Apple menu and open the CDs & DVDs preferences window. Make sure that audio CDs are set to launch iTunes and movie DVDs set to launch DVD Player when those media are inserted, as shown below. 3. Check that the drive can read discs normally. Insert an audio CD and check whether it shows up on your desktop or launches iTunes. Does the audio CD mount on the desktop or in iTunes? Yes: The drive seems to read CD discs okay. Go on to Step 4.
The computer won’t burn discs. 1. Check whether the drive can read CDs and DVDs normally. Perform the steps above for “CDs or DVDs don’t show up on the Desktop.” 2. Try a test burn by creating a Burn Folder, as follows. • In the Finder, choose “New Burn Folder” from the File menu. • Open the Burn Folder, drag an item inside for testing, and click “Burn” in the upper right corner of the window. • When prompted, insert a blank disc and follow the dialog instructions.
media. If the drive consistently rejects all blank media, or only rejects blank CD media while accepting blank DVD media or vice versa, replace the optical drive flex cable and test. Does the drive successfully burn to disc after replacing the optical flex cable? Yes: Problem solved. No: Replace the optical drive. Does it burn correctly now? Yes: Problem solved. No: Replace the logic board. Discs won’t insert. 1. Is there a disc already in the drive? Yes: Eject the disc before inserting another.
Optical disc constantly ejects 1. Disconnect all peripheral devices, especially the mouse in cases where the disc is constantly ejecting. Retest. If the issue is resolved, reconnect peripherals one-at-a-time until faulty peripheral is identified. 2. Try cleaning the disc. If the disc is dirty or scratched, it may not mount. Is the issue resolved? Yes: Problem solved. No: Try a different disc. If the issue persists, go on to the next step. 3.
Fan Sound Loud fan noise coming from inside the computer The iMac G5 (17-inch iSight) has a trio of fans that circulate air throughout the system. It also includes temperature sensors, and advanced thermal software that spins the fans fast or slow as needed. As the system usage increases, the fans will adjust their speed using advanced thermal software to meet the cooling needs of the system.
No: If the fan activity does not coincide with CPU usage, the sound you’re hearing may not be fan activity. Go to the Next Step. 4. The normal functioning of the hard drive and optical drive will generate additional whirring and scratching noises that may be audible. We can isolate these noises by booting the computer to the iMac G5 Install Mac OS X Install Disc 1. - Place the disc in the drive, and restart your machine while holding down the “C” key as the machine starts up.
Fans are running at a constant high speed If the fans on the system are running at a constant high speed, or ramp very quickly to high speed and do not vary once this speed is reached, the fans are most likely receiving incorrect thermal input. Follow these steps: 1. Reset the SMU (refer to “Resetting the SMU” mentioned earlier in this chapter) and then test to see if the fans still exhibit the issue. 2. Boot to Apple Service Diagnostic v2.5.
AirPort/Bluetooth Not able to connect wirelessly with AirPort or Bluetooth 1. From the Apple menu, choose About this Mac. 2. Click on More Info. System Profiler should open. 3. In System Profiler, in the column on the left, look under Hardware for a line called “AirPort Card”. Select that line. 4. Does the section to the right say “No Information Found”? Yes: The computer doesn’t realize it has an AirPort/Bluetooth combo card installed. Go to step.
AirPort signal seems to be very weak 1. Check the antenna. If the antenna is not plugged in all the way to the AirPort/Bluetooth combo card, AirPort range may be very short. Remove the front bezel, lower EMI shield, right speaker, and the combo card mounting screw. Disconnect and turn over the combo card, and reconnect the antenna cables to the card. Press the antenna connector firmly to make sure it’s fully connected to the card. Replace the cover and reconnect the power cord. 2.
IR Remote Remote won’t communicate with system applications such as iTunes or iPhoto, or with the optical drive. Make sure of the following when using the Apple Remote: • You are within 30 feet of the front of the computer. • You have an unobstructed line-of-sight to the front of the computer. • You are pointing the lens end of the Apple Remote directly at the front of the computer. • The computer is powered on and awake.
IR Sensor/Receiver Supported applications do not respond to input from the remote control. 1. Perform the checks above under “IR Remote” to verify that the Apple Remote is functioning correctly, and retest. Do supported applications now respond to input from the IR remote? Yes: Problem resolved. No: Go to the next step. 2. Verify that the IR Sensor can be seen in the Apple System Profiler. Open the Apple System Profiler and click on the “USB” section.
Built-in iSight Camera The built-in camera is not recognized. 1. Boot the iMac G5 to the desktop and launch iChat AV. Note: You do not need to be connected to a network to use iChat AV to troubleshoot. Verify that the correct versions of Mac OS X and iChat AV are installed. Reinstall or update software as needed. 2. Open the iChat AV preferences and click on the ‘Video’ icon. Verify whether the camera is recognized by the iChat AV software.
iChat AV connection doctor feature to verify that there is sufficient bandwidth to have a video iChat session without a significant degradation of image quality. No: The camera may not be functioning normally. Replace the camera board in the front bezel and retest. Camera recognized but no audio 1. Open the System Preferences window and click on Sound. 2. Verify that the built in iSight camera has been selected as the device for sound input. 3.
Speakers Can’t hear sound from the speakers. 1. Disconnect any external microphones, speakers, or headphones. 2. Access System Preferences and select Sound. In the Sound pane, select Output and make sure the Internal speakers are selected as the device for sound output, the Output volume is adequate, and Mute is not selected. M. Do you have sound now? Yes: Problem resolved. No: Go to the next step. 3. Reset parameter RAM.
No: Replace the speakers. 6. If the speakers did not solve the problem, replace the logic board.
Mouse My mouse doesn’t work at all. 1. Turn over the mouse and check the if the red LED on the underside of the mouse. Is the LED lit? Yes: The mouse has power. Try using the mouse on another surface. Non-reflective, opaque surfaces without repetitive patterns work best. The surface should be clean, but not shiny. Optical mice won’t work on glass, mirrored surfaces, glossy materials or mouse pads with pictures. No: There is no power to the mouse.
Keyboard Certain keys or none of the keys on the keyboard function. 1. Unplug all devices from your computer, including your mouse and keyboard as well as printer, scanner, external hard drives, and hubs. (Warning: Some devices may require you to perform steps before it is safe to unplug them, e.g, external storage devices.) Be sure to unplug your hub, if you have one. 2. Plug your keyboard into the back of your computer firmly and securely.
6. Close the System Preferences. Try typing a few characters. Did is solve the problem? Yes: Problem solved. No: Replace the keyboard. The USB port on my keyboard doesn’t work. 1. Unplug all devises from your keyboard. 2. Plug your Apple mouse into the left USB port on your keyboard. Does your mouse work when it’s plugged into this port? Yes: Now plug the mouse into the right port. Does it work? Yes: Try a known good keyboard. No: Try a known good mouse to rule out the mouse. Then go to step 3.
USB A USB device doesn’t work 1. Please unplug all of your USB devices from your iMac except your Apple Keyboard and Apple mouse. 2. Now plug your device directly into the back of your iMac. Does it work as expected now? Yes: Your device works when plugged directly into the computer. This indicates a conflict with one of the other USB devices. You can test by gradually adding your devices back and seeing where the issue occurs, then contacting the manufacturer of the device(s) for assistance.
Service Source Views iMac G5 (17-inch iSight) © 2005 Apple Computer, Inc. All rights reserved.
iMac G5 (17-inch iSight)—Upper Exploded View Camera Board 661-3811 Front Bezel 922-7070 Access Door 922-7079 Lower EMI Shield 922-7150 Left Bracket 922-7078 Inverter 661-3841 Right Bracket 922-7077 LCD Display 661-3789 TMDS Cable 922-7055 Hard Drive Fan 922-7063 Optical Drive Fan 922-7062 Speakers 922-7057 Hard Drive Data Cable 922-7058 CPU Fan 922-7064 AirPort/Bluetooth Card 661-3614 Logic Board 661-3787 IR Board 922-7148 iMac G5 (17-inch iSight) — Views 158
iMac G5 (17-inch iSight)—Lower Exploded View HD Temp Sensor Cable 922-7059 (shorter) ODD Temp Sensor Cable 922-7060 (longer) DC-DC Board 661-3788 Power Supply 661-3780 HD Mounting Bracket 922-7072 Hard Drive 661-3772 160 GB, 7200, SATA 661-3773 250 GB, 7200, SATA 661-3774 500 GB, 7200, SATA Temp Sensor, Optical 922-7168 Temp Sensor, Hard Drive 922-7169 Optical Flex Cable 922-7154 SuperDrive 661-3776 HD Pins 922-7001 DC Power Cable 922-7056 Camera Cable 922-7149 Clutch Cover 922-7080 Clutch 922-7074 Wir
Screw Chart iMac (iSight 17-inch) Note: Screws are not to scale.
922-7069 T10 A/C to chassis 922-7067 T10 922-7066 T10 922-7019 T8 DC board to rear cover Hard drive clip to hard drive 922-7068 922-7018 T10 T8 Left speaker, 17-inch Right speaker, 17-inch Optical bezel to optical drive 922-7011 922-7079 922-7020 T8 Phillips #2 Front bezel to bottom frame User access door screw 922-7159 922-7009 C-Clip for the access door T10 T10 Bracket mechanism to chassis Power supply to chassis iMac G5 (iSight 17-inch) Views 161
