Part Location Alh
1. Disconnect the ambient temperature sensor cable from the logic board, and remove the left speaker if you haven't done so already. 2. Disconnect the ambient temperature sensor cable from the left speaker. 3. Use a black stick to remove the sensor from the adhesive on the side of the speaker. 1. Attach the temp sensor to the left speaker. Connect the temperature sensor cable to the sensor. Replace the left speaker and speaker screw. 2. Connect the temperature sensor cable to the logic board...
Disc will not eject
1. Verify disc is not in use by quitting any applications that may be using the disc. 2. Verify drive slot is not blocked, bent, compressed or damaged. 3. Press and hold Media Eject key at top right corner of keyboard. If that does not work, hold down Function fn key then Media Eject key in sequence, then together simultaneously. 4. Drag disc icon to trash, or select it and press Command-E. 5. If none of these options eject the disc, you may have to disassemble the drive to recover the disc....
Tools Btl
This procedure requires the following tools, which are offered individually or as part of the cleaning _kjt, 076-1277. Sticky silicone roller 6-inch to clean the glass panel 922-8261 Sticky sheets to clean the silicone roller 922-8262 Polishing cloths, clean, anti-static, optical grade micro fiber terry style cloth 922-8263 iKlear Apple Polish or Brillianize anti-static spray cleaning solution for the outside of the glass Isopropyl alcohol IPA or LENSPEN to clean the inside of the glass Gloves,...
Take Apart
General Information 10 Product View 10 What's New 10 Product Configurations 11 Opening the Computer 11 Note About Images in This Manual 11 Serial Number Location 12 General Tools 12 Required Special Tools 12 Cleaning Tools Starter Kit 13 Removing the Glass Panel 13 View Under the LCD Panel 14 View of the Main Modules 14 View of Inside the Rear Housing 15 Back View 15 I O Ports 17 Cleaning and Handling the Glass Panel 18 Cleaning and Handling of the Glass Panel 29 Installing a Replacement Glass...
No Power
The computer will not turn on. The display remains black and there are no sounds from the fans or drives. 1. Verify the power outlet is good. Plug a different device into the socket to ensure there is power, or plug the iMac into another outlet. Does the iMac power on now 2. Check the power cord. Use a known good power cord. Does the iMac power on now Yes Your power cord has failed. Replace the AC power cord. No Go on to the next step. 3. Check the connection of the power cord on both ends....
Can not set up the aluminum Apple Wireless Keyboard
1. Confirm that you have Mac OS X v10.4.10 or later installed and install the keyboard software update. If using Mac OS X 10.4.5 or later the keyboard software update is not needed. 2. Install the batteries. Use a coin to remove the battery compartment cover. 3. Slide the batteries into the battery compartment as shown below. Replace the battery compartment cover and leave the keyboard turned off. 4. Open the Bluetooth Setup Assistant. 6. At the Select Device Type panel, select Keyboard. Do not...
Apple Hardware Test AHT Error Codes
The error codes listed below are the most likely codes that will be generated if a sensor cable is disconnected, dislodged, or if the system has a faulty cable or sensor. Clicking on the link in the chart will show you where the sensor and or cable connector is located. Or, reference the next two logic board topics which show a picture of the logic board and the sensor locations. Power supply sensor pin power supply Verify that the single pin connector on the top edge of the power supply is...
USB port is not recognizing known devices
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 for assistance. No Unplug your device from the iMac...
Diagnostic LEDs
The iMac has four built-in diagnostic LEDs on the main logic board that can help you to troubleshoot the computer. The four LEDs are located to the right of the memory slot, under the hard drive data cable. Note The cable has been removed in this photo. Indicates that the trickle voltage from the power supply has been detected by the main logic board. This LED will remain ON whenever the iMac is connected to a working AC power source. The LED will remain on even when the computer has been shut...
Removing the Memory
1. Shut down the computer, and disconnect all cables including the power cord. 2. Holding the sides of the computer, lay it face down on a soft, clean cloth so the stand is facing you. 3. After removing the access door, touch the metal stand or bezel 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...
The aluminum Apple Wireless Keyboard will not turn on
1. Confirm that the batteries are installed properly and the batteries are known good. 2. Open the battery compartment over. Make sure to install the positive and negative ends of the batteries in the keyboard as shown. The keyboard will not turn on if the batteries are incorrectly installed. 3. Replace the battery compartment cover. 4. Turn on the keyboard by pressing the Power On switch. Important After three minutes, the LED light turns off. The keyboard is still on, but it is no longer...
Cleaning Tools Starter Kit
The following tools are offered in the starter kit 076-1277 . Sticky silicone roller 6-inch to clean the glass panel Sticky sheets to clean the silicone roller, 2 pads Polishing cloths, clean, anti-static, microfiber terry style cloth 5 cloths Gloves, lint-free, anti-static, two pairs Microfoam bag to store the glass panel 5 bags ESD bag for LCD display storage, 5 bags
Cleaning Tools for the LCD and Glass
The following tools are necessary when servicing this product. Order a cleaning kit, 076-1277 , which contains all the items listed, or purchase the tools individually. Suction cups, one pair 922-8252 Sticky silicone roller 6-inch to clean the glass panel, Qty. of one 922-8261 Sticky sheets to clean the silicone roller, Qty of 2 pads 922-8262 Polishing cloths, clean, anti-static, micro fiber terry style cloth, Qty. 5 cloths, 922-8263 Gloves, lint-free, anti-static, Qty. of two 922-8253...
Camera image quality poor
The built-in camera is recognized by iChat AV and other supported video applications however 1. Verify that the lens assembly for the iSight camera is clean. Fingerprints and other contaminants can affect image quality. Clean the lens using a lint free lens cleaning cloth being while being careful not to scratch the lens. 2. Verify that there is sufficient lighting to produce a good quality image. Lighting which is comparable to that found in a well lit office will product a good quality image....
System Intermittently Shuts Down or Restarts Unexpectedly
1. Check the connection of the power cord on both ends. Verify that the power cord is securely plugged into a good AC outlet and that the cable is fully inserted into the back of the computer. Did re-seating the power cord resolve the problem Yes The power cord may have a loose fit or it wasn't fully inserted into the receptacle on the back of the iMac. Replace the AC power cord and test again. If the customer continues to report shut down or restart issues resume with step 2 of this...
Optical drive does not accept CD DVD disc
The optical drive on this computer has narrow tolerances for the recommended optical media. If the drive does not accept discs, the wrong kind of disc could be inserted. 1. Open the computer and slowly lift the panel. Verify that the four inverter-to-panel-cables are not resting on top of the optical drive. The inverter cables should be tucked into the open areas at the top and the bottom of the optical drive. The optical drive is delicate and if the cables are pressing on the top of the...
Apple Hardware Test AHT Error Codes 1
The error codes listed below are the most likely codes that will be generated if a sensor cable is disconnected, dislodged, or if the system has a faulty cable or sensor. Clicking on the link in the chart will show you where the sensor and or cable is located. Power supply sensor pin power supply Verify that the single pin connector on the top edge of the power supply is present and securely plugged in. If connector is damaged replace the DC Power Supply cable. If this sensor signal wire is...
Replacing the Camera Cable
1. Route the camera cable into the rear housing as shown below. 3. Replace the three pieces of Kapton tape onto the rear housing. 3. Replace the three pieces of Kapton tape onto the rear housing. 4. Replace the T8 screws on the black plastic cable holder. 4. Replace the T8 screws on the black plastic cable holder. 5. Replace the pressure wall and pressure wall screws. 6. Replace the chassis and screws. 7. Attach the AC inlet ground screw to the chassis. 11. Replace the optical drive, flex drive...
Flashing question mark or an alternating question mark and Mac OS face or a
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 2. No Go to Step 3. 2. Did Disk Utility successfully repair directory or permissions...
Replacing the Video Card
1. Make sure the CPU and GPU temp sensors on the back side of the logic board are connected. 2. Connect the video card to the logic board, lining up the gold fingers on the card with the video card slot on the logic board. 3. Install the three screws on the video board and connect the graphics sensor cable to the back of the logic board. Replacement Note The shorter screw attaches at the far right end 3. Install the three screws on the video board and connect the graphics sensor cable to the...
The LED is flashing on the keyboard or mouse
When your Apple Bluetooth mouse or keyboard is turned on, the light flashes twice in succession, and then repeats, blink-blink-pause, blink-blink-pause . This means the keyboard or mouse is discoverable by your computer, and you can pair with it. After three minutes, the indicator light turns off. The keyboard or mouse is still on, but it is no longer discoverable. To make it discoverable again, turn it off and then turn it back on. The keyboard on off switch is harder to find, so it's shown...
Loud fan noise coming from inside the computer
The iMac 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 speed and the amount of air that they are moving. In addition, the...
Removing the Hard Drive Sensor Cable
1. Disconnect the temperature sensor cable from its connector on the top of the logic board. 2. Remove the sensor-end of the cable from the sensor clip located under the foam gasket on top of the hard drive 1. Connect the sensor cable to the clip on the hard drive and to the connector on the logic board. Place the foam gasket over the sensor clip. 4. Clean and replace the glass panel. Note This step is very important. Follow the procedures to ensure the glass is clean and free of particles.
Replacing the DC PowerSATAInverter Cable
1. Install the DC power SATA inverter cable into the rear housing as shown below. 2. In the top left corner of the rear housing, position the cable between the black guide posts. Secure the cable in place with the clear Kapton tape. Route the inverter power cable off to the right, above the AirPort antenna can, see step 6. 3. In the middle of the rear housing, continue laying the cable between the black guide posts. Secure the cable with the Kapton tape . 4. Position the plastic cable guide...
Removing the Hard Drive
1. Disconnect the hard drive temperature sensor cable from the top of the logic board. 2. Push HARD on the black plastic clip and in the direction of the logic board to release the hard drive clip from the chassis. Once the clip is released, pull the hard drive toward the top of the chassis to release the hard drive pins from the rubber grommets on the chassis. 3. Disconnect the power and data cables from the power supply end of the hard drive. 3. Disconnect the power and data cables from the...
Installing a Replacement Glass Panel
1. Stand the computer upright. Note Fewer dust particles will settle on the LCD panel with the computer in the vertical position. 2. Roll the sticky silicone roller over the LCD panel to remove any particles. computer in the vertical position. 2. Roll the sticky silicone roller over the LCD panel to remove any particles. 3. Remove the new glass panel from the service packaging. Note The new panels have a removable film protecting the glass on both sides. 4. Place the glass on a clean microfoam...
Replacing the Glass Panel
1. Put on a pair of clean gloves with the rubberized-side of the gloves on the palm side of your hand. 2. Install the LCD display panel onto the computer if it was removed. 3. Replace the font bezel if it was removed, connect the microphone cable and replace the bezel screws. 4. Locate the sticky silicone roller and the dust removal pad. Remove the protective covering on the silicone roller and peel the protective cover off the dust removal pad. 5. Holding the sticky paper with your free hand,...
Keyboard is not discoverable
To pair your aluminum Apple Wireless Keyboard with your Macintosh computer, the keyboard needs to be in a 'discoverable mode.' Note If you need to put the older Apple Wireless Keyboard in a discoverable mode for pairing, see the previous topic. Follow these steps to put the aluminum Apple Wireless Keyboard in a discoverable mode 1. Open the Bluetooth Setup Assistant on your Mac For Mac OS X 10.4.10 or later 2. Turn on the keyboard by pressing the Power button on the right side of the keyboard....
Removing the Rear Cover
With all of the preliminary steps performed, the rear cover is the remaining assembly. Note the photo above happens to show the chassis on the rear housing. The rear housing does not include the chassis. Camera and microphone cable Power supply pressure walls, left and right
The USB port on my keyboard doesnt 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. No Try a different mouse or keyboard. 3. Now unplug the keyboard from the USB port on the back of the iMac, and plug the mouse into the port the keyboard had been in. Does the mouse...
Replacing the Microphone Cable
1. Route the camera cable as shown below. 3. Replace the EMI tape that grounds the exposed part of the cable to the chassis. 3. Replace the EMI tape that grounds the exposed part of the cable to the chassis. 4. Near the middle of the rear housing, replace the two T8 screws on the cable guide. 4. Near the middle of the rear housing, replace the two T8 screws on the cable guide. 5. Replace the pressure wall and pressure wall screws. 6. Replace the chassis and screws. 7. Attach the AC inlet ground...
Tool Kit Imac G5
The following tools are offered in the cleaning kit 076-1277 . Suction cups, Qty. of one pair Sticky silicone roller 6-inch to clean the glass panel, Qty. of one Sticky sheets to clean the silicone roller, Qty. of 2 pads Polishing cloths, clean, anti-static, micro fiber terry style cloth, Qty. of one 5 cloths Gloves, lint-free, anti-static, Qty. of two pair Microfoam bag to store the glass panel, Qty. of one 5 bags ESD bag for LCD display storage, Qty. of one 5 bags
Removing the Optical Drive
Warning When servicing the optical drive, handle it by the edges only. Pressing elsewhere on the drive could damage its internal mechanism. 2. Carefully peel back the strip of EMI mesh tape that anchors the bezel end of the drive to the rear cover. 3. Tilt up the optical drive, remove the two T6 screws on the flex cable board. Remove the flex cable board from the end of the optical drive. 4. Disconnect the temperature sensor cable from its connector on the top edge of the logic board. On the...
When I type strange characters appear on the screen
1. Depending on your iMac s settings, a simple keystroke can change your keyboard from English to Japanese. This can result in some pretty funny characters showing up when you type. To switch to the US keyboard, 3. Click on the International icon. 4. Click on the Input Menu near the top of the screen. 5. Scroll down the list and uncheck any non-US keyboard layouts. 6. Close the System Preferences. Try typing a few characters. Did is solve the problem Yes Problem solved.
Cleaning and Handling the Glass Panel
Follow the cleaning procedures in this manual to ensure the glass panel is free of dust and other particles before returning the computer to the customer. Note To view the movie, make sure the manual is opened in Acrobat. The iMac 20-inch Early 2008 model has a glass panel that attaches to the outside of the front bezel. The glass panel is not tempered and will break into sharp pieces if mishandled. A scratched or broken glass panel is not covered under warranty. Removing the glass panel...
iMac inch Early Upper Exploded View
661-4632, 250 GB, 7200, SATA 661-4633, 320 GB, 7200, SATA 661-4634, 500 GB, 7200, SATA 661-4635, 750 GB, 7200, SATA