Replacing the Hard Drive

Attach the hard drive sensor and sensor cable to the side of the hard drive. 2. Attach the mounting bracket and pins if they were removed. Connect the hard drive data and power cables. 3. Route the hard drive sensor cable under the metal chassis. Connect the sensor cable to the logic board. 4. Insert the hard drive pins into the grommets. Lower the drive into the rear housing. 4. Insert the hard drive pins into the grommets. Lower the drive into the rear housing. 5. Secure the two T10 screws...

Replacing the Optical Drive

Install the flex cable to the optical drive with two T6 screws. 2. Insert the optical drive bezel into the rear housing, lining up the bezel with the slot opening 1 . Be sure to align the two guide holes in the front bezel with guide posts at each end of the drive access hole. Push down on the mounting brackets 2 to lock the optical drive securely into place on the chassis. Caution Never press down on or grasp the body of the optical drive when installing it. Pressing or squeezing the body...

Replacing the Clutch

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, with the clutch springs at bottom. Install the seven long, clutch-to-stand mounting screws. 3. Adjust the clutch so that its chassis mounting holes align, and install the four screws that secure the clutch to the chassis. 4. Replace the silky EMI tape on top of the mechanism, press it into place. 5. Replace the metal mechanism cover. 6. Replace...

Removing the Clutch

Remove the EMI tape attached along the top and bottom sides of the clutch cover. After removing the tape, pull the cover straight off the clutch. 2. Peel back the EMI tape on top of the mechanism. Using a torx T10 screwdriver, remove the four clutch mounting screws. Stand up the unit, to access the clutch-to-stand mounting screws. Using a T10 torx screwdriver, remove the seven clutch-to-stand screws. Separate the mechanism and the stand from the rear housing.

Removing the Optical Drive

Looking at the circles below, starting with the top circle, do the following Peel back the silver EMI tape going from the chassis frame to the optical drive, remove the two T6 screws on the optical drive flex cable, disconnect the flexible cable, and disconnect the optical drive sensor cable from the logic board. Caution Never press down on or grasp the body of the optical drive. Pressing or squeezing the body of the optical drive could damage the mechanism. 2. Locate the black release...

Accessing the Diagnostic LEDs

Imac Diagnostic Led

The iMac G5 20-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. Raise the stand and use a Phillips 2 screwdriver to loosen the two captive screws...

Removing the AC Line Filter

Mac Central Line

Using a torx T10 screwdriver, remove the three self-tapping screws from the power inlet and the machine screw from the power inlet ground cable . 2. Carefully peel up the EMI tape on the AC filter peel off both the large and small EMI pieces of tape. Set them aside. 3. Disconnect the AC filter cable from the power supply. Notice the routing of the AC filter cable under the chassis. 4. Lift the AC filter out of the rear housing. 4. Lift the AC filter out of the rear housing.

Access Tool Modification

If you wish to modify the access card tool, order kit 076-1213. The kit contains an access card and a piece of EMI gasket that can be cut and added to the top of the card. The additional thickness on the card will improve the chances of making contact with each bezel latch. 1. Remove the tape on the gasket to expose the sticky side of the gasket. Attach the sticky side of the EMI gasket to the top of the access card. 2. Cut the EMI gasket to the edge of the access card. 4. Bend the card at a...

Replacing the Lower EMI Shield

Position the lower EMI shield over the bottom of the unit so that the holes for the IR board and the LED in the shield are properly aligned. 2. Press the sticky, edge of the EMI shield onto the bottom side of the display panel. The crease in the EMI shield should align with the edge of the panel. 3. Fold down the EMI shield and press it firmly over the bottom edge of the rear housing. Use a black stick to rub out any air bubbles and ensure that the EMI shield adheres firmly and without...

Fan Sound

Loud fan noise coming from inside the computer The iMac G5 20-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. Under normal conditions, rotating fans will make a slight hum that varies in relationship with their rotational...

Replacing the DCDC Power Supply Inverter

How Replace Cooler Imac

Route the inverter cable under the metal chassis frame. Check the routing of the cable so it doesn't get pinched under the chassis. 2. Install the screws on the chassis frame and the AC filter ground screw. 4. Connect the cables to the AC DC power supply and to the hard drive. Replace the two screws connecting the DC DC power supply inverter to the rear housing. 5. Replace the AC DC power supply. 12. Replace the lower EMI shield. 14. Replace the memory access door.

Replacing the Air Port Extreme Bluetooth Card

Connect the two antenna cables to the card. 2. Press the AirPort Extreme Bluetooth card onto the logic board connector. Make sure the card and antennas are securely connected before installing the speakers. 3. Replace the two AirPort Extreme Bluetooth card screws. 4. Replace the speakers and speaker screws. 5. Install the metal IR mounting bracket and two T6 screws. 6. Install the IR board and two T6 screws to the IR mounting bracket. 8. Replace the lower EMI shield.

Replacing the Camera Board

Apple Isight Wire Layout

Replace the camera board on the front bezel. Carefully align and insert the camera lens until it is snug in the bezel aperture 2. Replace the two screws on the camera board. Route the microphone cable under the clear mylar. 3. Connect the camera and microphone cables. 4. Tuck the camera board cables neatly into the channel on the rear housing. 5. Continue to lower the font bezel down over the pull rings in the memory compartment and then lower the top corners of the front bezel so they...

Hard Drive

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. Does the hard drive show in Disk Utility Yes Run Repair Disk and Repair Permissions to correct any directory and permissions issues. Go on to Step...

Removing the Display Panel

Using your fingers or a black stick, carefully peel the EMI tape off the right and left sides of the lower housing. 2. Peel the bottom of the EMI shield off the frame. 2. Peel the bottom of the EMI shield off the frame. 4. Using the access tool, a black stick, or your fingers, peel the black EMI tape off the right and left sides of the panel. Using the access tool or black stick, peel back the black EMI length of the top panel. 6. Using a Torx T6 screwdriver, remove the two TMDS connector...

Replacing the Logic Board

Imac Installed Torx

Position all the logic board cables out of the way except for the hard drive cable that attaches underneath so the logic board can be placed into the rear housing. 2. As you lower the board into the rear housing, make sure the memory pull-tabs are lowered through the access door opening and the screw holes line up with the board 3. Note If the replacement logic board doesn't have the support brackets shown below installed on the heatsink, transfer the brackets from the old board. Replace the...

Replacing the Front Bezel

Make sure the black EMI shielding along the top of the LCD panel is not in the way of the bezel latches when you lower the front bezel onto the computer. Use a black stick to press re-stick the EMI shielding onto the panel. 2. Connect the camera and microphone cables on the camera board to the cables sticking out of the top of the computer. 3. Tuck the cables neatly into the channel on the rear housing. 4. Continue to lower the font bezel down over the pull rings in the memory compartment...

Resetting the SMU System Management Unit

Imac Inch Ports

Unplug all cables from the computer, including the power cord. 3. Plug in the power cord while simultaneously pressing and holding the power button on the back of the computer. 5. Press the power button once more to start up your iMac G5 20-inch iSight . The iMac G5 20-inch iSight ports are shown below.

Removing the Logic Board

Xserve Motherboard

Remove the AirPort Extreme Bluetooth card from the logic board. Disconnect the antennas 2. Disconnect the optical cable, flex cable, and peel back the silver EMI tape from the logic board frame. 3. Using a T10 torx screwdriver, remove the seven screws on the board. Remove the self- tapping screws first black and yellow thinner circles . Replacement Note Always install the machine screws shown with wide white circles before installing the self-tapping screws 4. At the top of the heatsink,...

Replacing the Display Panel

Replace the TMDS cable on the rear of the display panel. 2. If removed, replace the metal panel mounting brackets to each side of the display. 3. Connect the four inverter-to-display cable connectors. Remember the connectors are keyed dot-side-up. 4. Replace the display panel with four mounting screws. 5. Connect the TMDS cable connector on the logic board and secure it with two screws. 6. Fold the EMI tape firmly over the left, top, and right edges of the display panel. Use your fingers or...

Removing the DCDC Power Supply Inverter

Imac Filter

Using a torx T10 screwdriver, remove the two power supply, DC-DC inverter screws connecting the board to the rear housing. Disconnect the two cables one going to the AC-DC power supply and the other connecting to the hard drive. 2. Remove just the circled chassis screws, one of which is the AC filter ground screw. Carefully lift the chassis frame just enough to pull the inverter cable from under the metal chassis.

Removing the Hard Drive

Remove Hard Drive Isight

Remove the two T10 screws attaching the hard drive to the DC DC inverter board 2. Disconnect the hard drive sensor cable from the connector on the logic board. Note the location of the sensor on the side of the hard drive and the routing of the cable. 3. The hard drive sensor is different from the optical drive sensor. The hard drive sensor can be identified by resistor R1700. Replacement Note Make sure to transfer the sensor to the replacement hard drive. Use the double-stick tape enclosed...

Removing the Memory

After removing the access door, touch the metal frame around the memory compartment to discharge any static electricity from your body. Important Always discharge static before you touch any parts such as the memory board. To avoid generating static electricity, do not walk around the room until you have finished replacing the memory. 2. Pull the two rings in the memory compartment down simultaneously. If a memory module is installed in the slot, pulling the rings will dislodge it.

Removing the Lower EMI Shield

Imac Black Back

Carefully peel the EMI shields off the each side of the lower rear housing. Use a black stick to help peel back the shields. 2. Carefully peel the lower EMI shield off the bottom edge of the rear housing. Use a black stick to help peel back the shield. 3. Peel the lower EMI shield upward to remove or view the AirPort Extreme Bluetooth card

Removing the Speakers

Inch Speaker

Using a T10 torx screwdriver, remove the 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 to the IR mounting bracket. Disconnect the IR cable from the IR board. 3. Remove the IR mounting bracket screws. Lift the bracket off the logic board to free the speaker cable. Replacement Note...

DDR Memory

IMac G5 20-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 20-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. The maximum amount of RAM you can install is 2.5 GB. User-configurable...

Replacing the IR Board

Route the IR cable as shown below and make sure the cable is connected to the logic board. 2. Install the IR board mounting bracket and screws. 2. Install the IR board mounting bracket and screws. 3. Replace the IR board onto the mounting bracket. Connect the cable and replace the two T6 screws. 4. Replace the lower EMI shield.

Lower EMI Shield

EMI tape covers the top and sides of the display panel, and the lower EMI shield covers the logic board along the bottom of the unit. The EMI tape and lower EMI shield are easily damaged when removed, and removal is necessary in order to access most components within the unit. Should the EMI tape that seals the display, or the EMI shield covering the bottom of the enclosure see photo below accidentally tear, use the EMI tape 922-4786 or 922-5026 to repair and completely seal the unit. When...

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. Show these items on the Desktop Hard disks 5 CDs, DVDs, and iPods M Connected servers '_I Always open folders in a new window amp Spri nq-loaded folders and windows Delay M Press Space B-ar to open immediately 2. Select System Preferences from the Apple menu and open the CDs amp DVDs preferences window. Make...

The SMU supports the following functions

provides initial configuration of system clocks automatically initiates and sequences voltage and frequency slews when the OS requests a transition to a new run level handles all power button and environmental user events monitors processor temperature and power consumption he iMac G5 20-inch iSight enclosure is divided into two discrete thermal zones. The two zones split the enclosure approximately in half. Temperature and power consumption are monitored by the operating system which...

Replacing the Speakers

Connect the speaker cable to the logic board. 2. Install the speakers and route the speaker wire as shown below. 2. Install the speakers and route the speaker wire as shown below. 3. Secure the right speaker with the smaller of the two mounting screws. 4. Secure the left speaker with the longer of the two mounting screws. 5. Install the metal IR mounting bracket and two T6 screws. 6. Install the IR board and two T6 screws to the IR mounting bracket. 8. Replace the lower EMI shield.

Removing the Front Bezel

Fix Macbook Mic Isight Cable

Position unit on rear cover back . 2. Tilt up the front bezel and remove three screws along the bottom. Warning The ambient light sensor is located next to the center screw. Don't mistake the ambient light sensor for a screw. Sticking a screwdriver or other sharp object in the ambient light sensor could damage the computer. 3. Slightly bending the upper quarter of the access tool card will help engage the latch more securely. Refer to the Access Tool Modification if the bezel is difficult to...

Imac G5 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 Energy Saver setting to see when the computer has been designated to sleep. 3. Reset your computer's PRAM Parameter RAM . - If...

Power Issues

Macbook Pro Logic Board Diagnostic

The display has no picture or color and no sounds can be heard 1. Verify 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. Verify that the power cord is securely plugged into both the AC outlet and the back of the computer. 4. Remove keyboard, mouse, and other peripherals such as...

Tools Required

The following tools are required to service the computer. Note that a special access card part 922-7172 is required to open the front bezel. ESD-safe workstation and mat Soft, clean towel or cloth to protect the display and removed parts from scratches Access card part 922-7172 Black stick or other nonconductive nylon or plastic flat-blade tool Torx T8 screwdriver magnetized Torx T6 screwdriver magnetized Torx T10 screwdriver magnetized

Replacing the ACDC Power Supply

Invertor Imac

WARNING The AC DC power supply PCB remains powered up whenever the system is plugged in, whether or not the system has been turned on. Use extreme caution when troubleshooting the system with the front bezel removed. Don't work alone. In the event of an electrical shock it is important to have another individual present who can provide assistance. Keep one hand in your pocket when working on any iMac G5 iSight system that is plugged in. This will help ensure that your body does not provide a...