Part Location Hrd
1. Disconnect the ten cables from the connectors on the logic board. Note The speakers would already be removed. 2. Using a T10 torx screwdriver, remove the screws from the logic board. Note the locations of the three self-tapping screws marked by and S in the photo . The rest of the screws are machine screws. Rotate the unit so the power supply is in the bottom right corner and the optical drive is on your left. With a black stick, disconnect the power supply cable on the underside of the...
Replacing the LVDS Cable
1. Position the LVDS cable on the back of the display panel as shown. 2. Connect the LVDS cable connector. When connected correctly the locking levers will secure the connector and it cannot be disconnected without depressing the levers. 3. Secure the LVDS cable to the panel with one strip of tape. 4. Replace the display panel. Note If you are replacing the display, a piece of black mylar is enclosed in the box with the display module. The dotted lines below show the correct placement of the...
Lower Exploded View
661-3943 80 GB, 7200 661-4175 160 GB, 7200 - Camera Cable Microphone 922-7675 Not shown EMI tape 922-5026 EMI tape 922-4786 922-7651 Mid 2006 922-7832 Late 2006 CD
Removing the Optical Drive
1. Disconnect the sensor cable from the temperature sensor on top of the optical drive and remove the two T10 screws from the optical drive clip on the logic board. 2. 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. 3. 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...
No Video
No Video, No Boot Chime, White LED ON Symptom 1 The iMac will turn on indicated by the front LED ON , but there is NO boot chime and No Video on the display. The faint sound of the fans, hard drive, and optical drive may also be heard. 1. Follow instructions in the General Information chapter to reset the SMC. Does the computer display video after successfully resetting the SMC 2. Verify that only supported SDRAM memory has been installed and that it has been installed correctly. Unsupported...
Removing the Front Bezel
1. With the bottom facing toward you use a T8 torx screwdriver to remove the four bezel mounting screws. Note The screw to the right of the door is longer. 3. Located the access card tool. Bend the upper quarter of the access tool card slightly to engage the front bezel latches. Note Refer to Access Tool Modification in the General Information chapter if the bezel is difficult to open. This picture is intended to show how the access tool disengages the latch. Pushing the tool up the vent on the...
Remove the Hard Drive
1. Position yourself at the base of the computer closest to the stand. 2. Pull in on the edge of the mounting bracket until you feel it release from the chassis. Pull HARD The hard drive bracket will release on the end near your hands. 3. Disconnect the hard drive power and data cables. Set the hard drive aside. 4. Note If you are replacing a bad hard drive, remove the mounting bracket and the mounting pins shown in the following steps before returning the bad drive to Apple. 5. Using a T10...
Remove the LVDS Cable
1. Locate the LVDS cable on the back side of the display panel. Remove the piece of tape circled that secure the cable to the panel. To access the connector, peel back the black mylar tape that partially covers the LVDS connector. 1. Locate the LVDS cable on the back side of the display panel. Remove the piece of tape circled that secure the cable to the panel. To access the connector, peel back the black mylar tape that partially covers the LVDS connector. 2. Remove the tape securing the LVDS...
Diagnostic LEDs
The iMac has three built-in diagnostic LEDs and a front LED on the main logic board shown below that can help you to troubleshoot the computer. 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 troubleshooting LEDs 1, 2, and 3 are located to the right of the LVDS cable connector, under a square of black tape. Peel back the tape to view the LEDs. Note that the LEDs are marked 1,...
Audible buzzing whining or ticking noise
The iMac 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. If an earlier version of the operating system has been installed then the fans may run at excessive speeds. 2. Determine...
How to Reset the System Management Controller SMC
The System Management Controller SMC is a chip on the logic board that controls all power functions for your computer. If your computer is experiencing any power issue, resetting the SMC may resolve it. The SMC controls several functions, including Telling the computer when to turn on, turn off, sleep, wake, idle, and so forth. Handling system resets from various commands. Note that resetting the SMC does not reset the PRAM. Resetting the SMC will not resolve issues in which your computer is...
Power On Self Test POST
Intel-based Mac computers rely on a combination of tones and blinking LEDs to display Power If the computer detects out-of-specification or no SDRAM or the RAM installed does not meet the appropriate specifications, the screen will remain black but the power LED on the front of the computer will blink once per second to signal the error. This error condition may be due to physically damaged RAM, installing the incorrect type of RAM, or not having RAM installed. Some RAM may appear to pass the...
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. When properly...