Shimmering Vertical Lines Horizontal Lines
The iMac will wake from sleep, but a slight shimmering of the image may be visible. In some cases the shimmering on the display may worsen so that the display fills with vertical lines, horizontal lines, or the image begins to shake refer to the following four images samples. Continue with the procedure to correct the issue. 1. Open the Energy Saver System Preferences and temporarily set the display to sleep after one minute. Set the computer to sleep after ten minutes. Once the Energy Saver...
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...
Checking Compatibility between AirPort Card and Logic Board
The iMac Late 2006 computers were built with a number of logic boards and AirPort Extreme cards. To avoid confusion identifying the correct logic board and AirPort Extreme card for the system, refer to the table in this section which lists the corresponding EEE codes. To locate the EEE code on the AirPort Extreme card, remove the card from the logic board. Turn the card over, and look for the representative EEE code within the card's serial number. Locate the last four digits in the serial...
Removing the Front Bezel
1. Position unit on rear cover with the stand facing you. 2. Tilt up the front bezel and remove four screws along the bottom. The longer screw is the second screw from the right. It's to the left of the ambient light sensor. Warning The ambient light sensor is located in the second hole from the right. Don't mistake the ambient light sensor for a screw. Sticking a screwdriver or other sharp object in 3. Locate the access card. Bending the upper quarter of the access tool card will help engage...
Discs wont insert
1. Is there a disc already in the drive Yes Eject the disc before inserting another. Refer to Knowledge Base article 106752, Macintosh How to Eject a Disc When Other Options Do Not Work If none of these options will eject the disc, you may have to disassemble the drive to recover the disc. See Knowledge Base article 86382 - Macintosh How to Remove a Stuck Disc From a Slot-Loading Drive. No Reseat the optical drive. Perform the Optical Drive procedure in Take Apart to reseat the drive in the...
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 No Try a different disc. If the issue persists, go on to the next step. 3. Boot from Apple Hardware Test hold down the D key at startup . If you can boot to this volume, run the...
Fans running at full speed after the computer turns on
The customer may have entered a diagnostic mode that causes the fans to run at full speed. Restarting the system will not restore normal fan operation. To solve the problem, the user or technician should do the following 2. Disconnect the power cord and wait 15 seconds. 3. Reconnect the power cord and wait 5 seconds. Note Customers reporting this symptom should be told to press the power button AFTER the power cord has been fully inserted. Inserting the power cord while pressing the power...
To reset the SMC
1. From the Apple menu, choose Shut Down or if the computer is not responding, hold the power button until it turns off . 2. Unplug all cables from the computer, including the power cord. 4. Plug the power cord back in, making sure the power button is not being pressed at the time. 5. Reconnect your keyboard and mouse to the computer. 6. Press the power button on the back to start up your computer.
Replacing the CPU Fan
1. Lower the fan onto the white standoffs in the rear housing. Push it down snug onto the posts. 7. Replace the lower EMI shield. 9. Replace the memory access door.
To Access the Diagnostic LEDs
1. Follow the take apart instructions to remove the RAM access door, front bezel, and lower EMI shield. 2. Locate the SO-DIMM slot and LVDS video connector. The three diagnostic LEDs 1, 2, and 3 are located below the battery and to the right of the memory slot. Note that the LEDs are marked 1, 2, 3 as show below. An additional front bezel LED is located in an opening at the center of the right speaker, see photo on the next page . Indicates that the trickle voltage from the power supply has...
No Power
The iMac 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. Verify...
iMac inch Late Lower Exploded View
Cable, Power, AC DC, SATA, Inverter 922-7761 Cable, Ground, Power Supply 922-7760 AirPort, Antenna, Wireless 922-7764, Left 922-7766, Right Rear Housing 922-7769 Ambient Light Sensor 922-7250 SDRAM, SO-DIMM 661-4114 512 MB, DDR2, 667 661-4115 1GB, DDR2, 667 Modem, External 661-3797 Battery 922-6476 Power Cord 922-7139 Access Tool 922-7172 Wireless Mighty Mouse 661-3662
September 1
Product Introduction iMac 20-inch Late 2006 Logic board Intel Core 2 Duo processor running at 2.16 or 2.33 GHz AirPort Extreme and Bluetooth antennas Two AirPort antennas, one Bluetooth antenna Inverter Board New service part, 661-4112. It serves as the flat panel backlight controller. Camera Board New service module, 661-4113, is smaller than previous camera boards. Memory Accepts up to a 2 GB SO-DIMM in each of the two memory slots, but the iMac will only support 3 GB total memory Rear cover...
Opening the Computer
Apple authorized, desktop certified technicians only should ever remove the front bezel on the iMac 20-inch Late 2006 . 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. As you are inserting the...
Removing the Camera Board
1. The camera board and cables are visible as you lift the front bezel off the computer. 2. Remove any kapton tape on the cables. Disconnect the camera and microphone cables. 3. Remove any kapton tape covering the camera board. With your fingernail or a black stick, gently lift flip up the flex cable locking hinge to release the flexible camera cable. With your fingers or black stick, flex the two black tabs forward to release the camera board from the camera bracket. 5. Remove the camera board...
Replacing the AC Line Filter
1. Install the AC power filter 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 below Connect this cable to the power supply. 4. Using the EMI tape, securely tape the top and bottom edges of the AC power inlet to the rear housing. 5. Replace the power supply if removed . 10. Replace the IR Board if removed . 12. Replace the lower...
iMac inch Late Upper Exploded View
Display Panel, LCD, 661-3895 Samsung 661-3881 LG Shield, EMI, Lower LCD not shown 922-7770 661-4108, 661-4109, 661-4110, 661-4111, 661-4294, 661-4295, 661-4296, 661-4297, Front Bezel, w camera, 20 922-7875 Logic Board 2.16 GHz, 128 2.33 GHz, 128 2.16 GHz, 256 2.33 GHz, 256 2.16 GHz, 128 2.33 GHz, 128 2.16 GHz, 256 2.33 GHz, 256 AirPort Card 661-4060 VZL EEE code , J661-4060 Z661-4060 661-4289 WQX EEE code Front Bezel, w camera, 20 922-7875 Optical Bezel 922-6997, MKE 922-7109, Pioneer - Hard...
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...
Replacing the Stand
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, 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...
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 with EMI tape. Pay particular attention to the EMI shielding inside the rear housing, shown below. The EMI shield is easily damaged when replacing modules. EMI tape covers the top and...