Replacing the Serial ATA Hard Drive

Remove the replacement hard drive from its packaging. 2. Connect the drive data cable and power cable to the hard drive. Lower the hard drive into place on the midplane. 3. Connect the hard drive thermal sensor to the sensor board on the side of the hard drive. 4. Replace the three hard drive screws. 4. Replace the three hard drive screws.

Loud fan noise coming from inside the computer

The grill on the bottom of the iMac G5 lets a trio of fans draw cool air into the system. Advanced thermal software spins the fans fast or slow as needed, passing the heated air through a slit on the back cover. 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 speed and the amount of air that they...

Replacing the Power Supply

Remove the replacement power supply from its packaging. Note The replacement power supply has an ambient light sensor attached with two plastic rivets. 2. As you lower the power supply into the front bezel, line up the ambient light sensor (on the power supply) with the hole in the display bezel. 3. Tilt up the power supply until it clears the edge of the logic board. Lower it into place. 4. When the power supply is installed properly it should be flush with the gray plastic parts on the right...

Removing the Right Antenna Cable

Air Deflector Shield Sensor

Remove the air deflector from the logic board. It has double-stick tape holding the deflector to the board. 2. Remove the two screws on the AirPort Bluetooth card. 2. Remove the two screws on the AirPort Bluetooth card. 3. With your fingers, lift the AirPort Bluetooth card off the logic board. Disconnect the antennas from the card. 5. Release the antenna from the metal clips.

Loud buzzing ticking or whining noise

The computer may make a loud buzzing, ticking, or whining noise when it's on. The sound may vary depending upon screen brightness or processor load. 1. Determine that this noise is related to the computer by removing and shutting down all other devices in the vicinity of the computer that could be causing a sound. 2. Determine if this is a power supply noise. With the iMac G5 on and running, adjust the screen brightness by pressing the F14 and F15 keys on the keyboard. Does the noise change in...

Whats

On November 2, 2006, Apple announced the iMac G5 Repair Extension Program REP for Power Supply Issues. Information on the Repair Extension Program for Power Supply Issues has been added to the take apart and troubleshooting chapters. This REP is a worldwide program that applies to iMac G5 20-inch Ambient Light Sensor models sold worldwide between May 2005 and October 2005 that feature a 2.0GHz G5 processor and that have power-related issues as a result of a specific component failure within the...

Removing the Air PortBluetooth Card

Remove the air deflector gray plastic by pulling it off the logic board. It's attached by double-stick tape. 2. Remove the two T6 screws on the AirPort Bluetooth card. Lift the card off the board. 3. Turn over the AirPort Bluetooth card. Disconnect the two antennas. 3. Turn over the AirPort Bluetooth card. Disconnect the two antennas.

My Air Port signal seems to be very week

If the antenna is not plugged in all the way to the AirPort Bluetooth card, you may have very short AirPort range. 2. Remove the back cover. 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. 3. Try connecting to your wireless access point now. Did your reception improve Yes It looks like the antenna had not been plugged in all the way. You should be...

Removing the Inverter

Inverter Board Imac Service

Locate the hard drive near the top right corner. 2. Disconnect the thermal sensor cable from the sensor board on the side of the hard drive. Note Do not disconnect the other end of the cable. Leave the hard drive in place. 3. Locate the memory module s in the bottom right corner. You must remove the memory to gain access to the inverter. 3. Locate the memory module s in the bottom right corner. You must remove the memory to gain access to the inverter. 4. Rotate the computer counterclockwise...

Removing the Microphone Cable

From the top of the logic board at the bottom of the port bank, use a needlenose pliers to disconnect the microphone and speaker cables. 3. Slide the speaker forward a bit to access the microphone. Peel up the microphone tape. Remove the microphone off the speaker. 4. Route the microphone and speaker cables through the midplane chassis opening. 4. Route the microphone and speaker cables through the midplane chassis opening.

Not able to connect wirelessly with Air Port or Bluetooth

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 It looks like your computer doesn't realize it has an AirPort Bluetooth card installed. Go on to step. 5 No It looks like your iMac recognizes that it has an AirPort Bluetooth card installed. Go on to step 6. 5. Remove...

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 this speed once reached, the fans are most likely receiving incorrect thermal input. In these cases you should use the following steps to resolve 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 from the iMac G5 Install DVD or another iMac G5 of the same type in FireWire Target disc mode...

A USB device doesnt work

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. No Unplug your device from the...

Ambient Light Sensor

Imac Ambient Light Sensor Rivets

The new iMac G5 has an ambient light sensor. It's located on the bottom of the display bezel, near the case screws. Look at the picture below. Next to the middle screw is a small bump protruding from the case. This is the ambient light sensor. The ambient light sensor attaches to the power supply with two plastic rivets. The ambient light sensor cable runs under the power supply and attaches to the logic board.

Replacing the Right Antenna Cable

Position the exposed part of the antenna in the cut-out on the top of the chassis. Lower the antenna holder onto the chassis, lining up the holes in the chassis with the tabs on the antenna. Note A new antenna will have a piece of tape covering the sticky backing on the antenna. 3. Connect the antennas to the AirPort Bluetooth card to the logic board. 4. Replace the two screws on the AirPort Bluetooth card.

Removing the Logic Board

How Install Thermal Sensor

Remove the air deflector located above the I O ports. There are no screws, it's held in place with double-stick tape. 2. Remove the two T6 screws on the AirPort Bluetooth card. 3. Disconnect the antennas from the AirPort Bluetooth card. 3. Disconnect the antennas from the AirPort Bluetooth card. 4. Disconnect the two hard drive cables and the two fan cables. Remove the two fan screws and the two video cable screws. 7. Disconnect the lower fan cable from the logic board. 7. Disconnect the...

Replacing the Logic Board

Imac 2008 Logic Board Removal

Remove the replacement logic board from its packaging. 2. Locate the cleaning wipe and syringe in the replacement logic board box. 4. Whenever you remove the logic board clean the video chip circled and reapply thermal grease. 5. Using the enclosed syringe, add a 3-mm drop of thermal grease to the video chip on the backside of the logic board. 6. Install a new gasket and light pipe if you replace the logic board. 7. Before placing the logic board into the midplane chassis, tape the cables...

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.

Grounding Yourself

Grounding Yourself Touching

Touch the metal surface as shown below on the inside of the computer to discharge any static electricity. Warning Always discharge static electricity before you touch any parts or install any components inside the computer. To avoid generating static electricity, do not walk around the room until you have finished installing the part and closed the computer.

Dont hear sound from the speakers

Press the F5 button on your keyboard. It has a sound icon on it. Do you hear sound now Yes It looks like your volume was muted. When this happens again, just press the F4 and F5 keys to regulate your volume. No Are there any external microphones, speakers or headphones plugged into the iMac If yes, go on to step 2. If no, go on to step 3. 2. Disconnect your external microphones, speakers, or headphones. Do you hear sound now Yes It looks like the built-in speakers are working properly. Now...

Hear sound out of only one speaker

Are there any external microphones, speakers or headphones plugged into the iMac Yes Disconnect any external microphones, speakers, or headphones. Do you hear audio from both of the built in speakers on your iMac - Yes Good. It looks like the built-in speakers are working properly. This may be an issue with the microphone, speakers or headphones that were plugged into your iMac. Please work with the manufacturer to troubleshoot this issue. No Check your speaker balance. If your balance...

The computer will turn on but the display has no picture or color The boot chime the fan and hard drive activity can be

Imac Led Diagnostic

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 your iMac is on, turn it off by pressing the power button in until the computer powers off. You should hear the drives and fans go...

Removing the Left Antenna Cable

Imac Bluetooth Antenna Location

Remove the air deflector from the logic board. It has double-stick tape holding the deflector to the board. 2. Remove the two screws on the AirPort Bluetooth card. 2. Remove the two screws on the AirPort Bluetooth card. 3. Disconnect the AirPort Bluetooth card from the board. Disconnect the antennas from the card. 5. Looking at the back of the chassis, gently pull the antenna cable through the holes.

Verification and Repair Procedure

Imac Serial Number

To verify whether the 20-inch iMac G5 Power Supply REP covers the repair of a 20-inch Mac G5 computer, do the following. 1. Verify that the 20-inch iMac G5 computer exhibits one of the following symptoms System will not start up after the power button is pressed System shuts down intermittently 2. Verify that the EMC number on the label on the bottom of the stand is 2056 see below . 3. If the computer is eligible, remove the rear cover. Proceed to the next page. 4. Remove the power supply. Turn...

Replacing the Left Antenna Cable

Fan Hole Imac

Position the exposed part of the antenna in the cut-out on the top of the chassis. Lower the antenna holder onto the chassis, lining up the holes in the chassis with the tabs on the antenna. Note A new antenna will have a piece of tape that covers the sticky backing on the antenna. 2. Tuck the antenna into the channel at the top of the chassis. Route the antenna under the metal cable guides. 3. Thread the antenna through the holes in the chassis under the fan duct. 3. Thread the antenna...

Imac G5 No Power

Where Gpu Diode Imac

The display has no picture or color and no sounds can be heard coming from the fan or hard drive. Important Refer to the iMac G5 Repair Extension Program REP for Power Supply Issues topic at the begining of the troubleshooting chapter before proceeding with 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...

Replacing the Inverter

Imac Hard Drive Heat Sensor

Remove the replacement inverter from its packaging. 2. Locate the gray plastic cover you set aside. 3. Install the plastic cover on the replacement inverter board. Gently squeeze the board near each tab circled until all six tabs snap onto the board. 4. Locate the inverter cable cover. Connect the inverter cables as shown, making sure the connectors lie flat inside the cable cover. 5. Lower the cable cover, pressing down steadily until the tabs lock the cover into place. 6. Press in the...

Overview

The iMac G5 Power Supply REP program covers 20-inch iMac G5 Ambient Light Sensor models that exhibit one of the following power-related issues System will not start up after the power button is pressed System shuts down intermittently The iMac G5 REP for Power Supply Issues covers affected iMacs for up to three 3 years from the original date of purchase. Apple will continue to evaluate the repair data and will provide further repair extensions as needed.

Special CompTIA Code

Apple has created the following two CompTIA Codes that must be used for repairs on iMac products eligible for coverage under the iMac G5 REP for Power Supply Issues Asia-Pacific, Canada, Europe, Latin America and the United States Use CompTIA Code 661 iMac Power Supply REP when replacing a power supply board under the iMac G5 Power Supply REP, whether or not the computer is covered by warranty or an extended service agreement. Service providers in Japan who create a mail-in repair for 20-inch...

Service Source

Imac Power Units Mark

IMac G5, 20-inch Ambient Light _Sensor iMac G5 Repair Extension Program for Power Supply Issues On November 2, 2006, Apple announced the iMac G5 Repair Extension Program REP for Power Supply Issues. This program applies to iMac G5 20-inch Ambient Light Sensor computers exhibiting power-related issues as a result of a specific component failure within the computer s power supply. Program instructions and the CompTIA code for the iMac G5 Power Supply REP repair are provided in this section. The...

IMac G inch Ambient Light Sensor

Apple Imac Mhz Video Card

Light Pipe w Gasket 922-6797 Air Deflector 922-6870 Logic Board 661-3613, 2.0 GHz, ALS Ambient Light Sensor Cover, Inverter, Lamp Wires 922-6819 Optical Drive, Super Drive, 8x 661-3607 Memory - SDRAMM, DDR 333 661-3615, 512 MB 661-3616, 1 GB Note The Hard Drive is not part of chassis 661-3603 250 GB 661-3604 400 GB