Apple imac 20 inch late 2006 User Manual

							iMac (20-inch Late 2006) Troubleshooting — Symptom Charts 181
iChat AV connection doctor feature to verify that there is sufficient bandwidth to have a 
video iChat session without a significant degradation of image quality.
 
 
No :  The camera may not be functioning normally. Replace the camera board in the front 
bezel and retest.
Camera recognized but no audio
Open the System Preferences window and click on Sound. 
1.  
Verify that the built in iSight camera has been selected as the device for sound input
2.   . 
Verify that the volume settings (on the slider bar) are appropriate. 
3. 
Launch iChat AV and open the iChat AV preferences. Click on the ‘Video’ icon. Speak into 
4.  
the microphone while monitoring the microphone level indicator. Does the line level meter 
respond while you are speaking? 
 
Yes: The microphone circuit is functioning correctly. Check the preference settings of any 
supported AV applications the customer is experiencing problems with to make sure that 
the microphone feature is enabled and that the internal iSight microphone has been 
selected as the input device.  
 
No: Inspect the microphone / camera cable attached to the camera board inside the front 
bezel. If the cable is damaged, replace the cable and retest. If the issue continues, replace the 
front bezel. The front bezel contains the microphone.
Audio Quality Poor
The camera is recognized but the built-in microphone’s audio quality is poor.
Open the System Preferences window and click on Sound.  
1.  
- Verify that the built-in camera has been selected as the sound input port.  
- Verify that the input volume settings are appropriate. Use the volume level meter to verify 
settings.
Open iMovie and create a new project. Click on the Audio button and record a sound 
2.  
sample. Is the sound quality acceptable? 
 
Ye s : The microphone is functioning normally.  The audio quality problems may be caused by 
bandwidth limitations when using iChat over the internet. Instruct the customer to use the 
iChat AV connection doctor feature to verify that there is sufficient bandwidth to have an 
audio iChat session without a significant degradation of audio quality.  
 
iChat AV allows the user to limit the allocated bandwidth which could impact audio quality. 
Check the settings and increase the bandwidth if needed.  
 
No : The microphone may be faulty. Replace the front bezel which houses the microphone.  
						

							iMac (20-inch Late 2006) Troubleshooting — Symptom Charts 18 2
Speakers
Can’t hear sound from the speakers.
Disconnect any external microphones, speakers, or headphones. 
1.  
Access System Preferences and select Sound. In the Sound pane, select Output and make 
2.  
sure the Internal speakers are selected as the device for sound output, the Output volume is 
adequate, and Mute is not selected.  Do you have sound now? 
Yes: Problem resolved.  
No: Go to the next step.  
Reset parameter RAM. Press Command-Option-P-R during startup but before “Welcome to 
3. 
Macintosh” appears. Do you have sound now?  
Yes: Problem resolved.  
No: Go to the next step. 
Plug headphones or external speakers into the Line out /headphone port. Do you have 
4.  
sound through these devices when plugged in? 
Yes: Verify that the speaker cable connector is securely attached to the logic board. If the 
issue persists, replace the speakers.  
No: Replace the logic board
Verify that the speaker cable connector is securely attached to the logic board. Do you have 
5. 
sound now? 
Yes: Problem resolved.  
No: Replace the speakers.
I hear sound out of only one speaker.
Are there any external microphones, speakers or headphones plugged into the iMac?  
1.  
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: Go to step 2.  
No: Check your speaker balance. If your balance setting was set to the left or right speaker, 
you would only hear sound from one speaker. Go to step 2.
Open System Preferences. (System Preferences can be found under the Apple menu.)
2.  
Click once on the sound icon.
3. 
Click once on the Output tab.
4.  
Make sure your balance setting is in the middle. After adjusting the audio balance, do you 
5. 
have audio from both speakers now? 
Yes: It looks like the issue was the balance was not set properly.  
No: Replace the speakers.
If the speakers did not solve the problem, replace the logic board.
6.   
						

							iMac (20-inch Late 2006) Troubleshooting — Symptom Charts 18 3
Mouse
The mouse is slow or not tracking smoothly
Refer to Knowledge Base article 93369.
The Apple Wireless keyboard and mouse have connection issues.
If you have any of these issues, refer to Knowledge Base article 86496 for more information.
If you can’t wake the computer up using the Apple Wireless Keyboard or Apple Wireless 
• 
Mouse.
You can’t pair the computer with the Apple Wireless Keyboard or Apple Wireless Mouse.
• 
You can’t maintain a connection between the computer and the Apple Wireless Keyboard or 
• 
Apple Wireless Mouse.
My mouse doesn’t work at all.
Turn over the mouse and check the if the red LED on the underside of the mouse. Is the LED 
1.  
lit? 
Yes: The mouse has power. Try using the mouse on another surface. Non-reflective, opaque 
surfaces without repetitive patterns work best. The surface should be clean, but not shiny. 
Optical mice won’t work on glass, mirrored surfaces, glossy materials or mouse pads with 
pictures.  
No : There is no power to the mouse. Try plugging the mouse into one of the USB ports 
on the machine. If the mouse won’t power on from any USB port, try it on a known good 
machine. If the mouse fails to power on with known good machine, replace the mouse. If the 
mouse will power on with a known good machine, replace the main logic board.
If the underside LED is lit and the surface is good, and the mouse still does not track, try 
2.  
plugging the mouse into another USB port on the machine. Does the mouse track now? 
Ye s : Issue resolved. Try the other USB ports on the system to make sure you don’t have a bad 
port.  
No : Try using a known good mouse. If a known good mouse resolves the issue, replace the 
mouse. If a known good mouse does not resolve the issue, replace the main logic board.
My mouse works intermittently (the cursor freezes randomly) or is slow to 
respond.
Try using the mouse on another surface. Non-reflective, opaque surfaces without repetitive 
1.  
patterns work best. The surface should be clean, but not shiny. Optical mice won’t work on 
glass, mirrored surfaces, glossy materials or mouse pads with pictures. Does the mouse track 
correctly on a proper surface?
 
Ye s : Issue resolved.  
No : Check the Mouse Tracking setting in the Mouse control panel. 
Boot to another volume (like the System Install Disc). Does the mouse track properly now? 
2.  
Ye s : Reinstall System Software 
No : Try a using a known good mouse. If a known good mouse resolves the issue, replace the  
						

							iMac (20-inch Late 2006) Troubleshooting — Symptom Charts 18 4
mouse. If the issue persists with a known good mouse, replace the main logic board.
Keyboard
The Apple Wireless keyboard and mouse have connection issues.
If you have any of these issues, refer to Knowledge Base article 86496 for more information.If you can’t wake the computer up using the Apple Wireless Keyboard or Apple Wireless 
• 
Mouse.
You can’t pair the computer with the Apple Wireless Keyboard or Apple Wireless Mouse.
• 
You can’t maintain a connection between the computer and the Apple Wireless Keyboard or 
• 
Apple Wireless Mouse.
Certain keys or none of the keys on the keyboard function.
Unplug all devices from your computer, including your mouse and keyboard as well as 
1.  
printer, scanner, external hard drives, and hubs. ( Warning: Some devices may require you 
to perform steps before it is safe to unplug them, e.g., external storage devices.) Be sure to 
unplug your hub, if you have one.
Plug your keyboard into the back of your computer firmly and securely. Plug your mouse 
2.  
into the back of your computer firmly and securely. Take special care to make sure the 
connector is completely in the socket. Go on to step 3.
Does your keyboard work now? 
3. 
 
Yes: Problem solved.  
No: Unplug your keyboard and plug it into another USB slot on the back of your iMac.  Does 
it work now? 
  Yes: Replace the logic board.  
  No: Unplug your keyboard and plug your mouse into the port the keyboard just 
occupied. Go on to step 4.
Does your mouse work now? 
4.  
Yes: Replace the keyboard.  
No: Replace the logic board. 
						

							iMac (20-inch Late 2006) Troubleshooting — Symptom Charts 18 5
My keys are sticky or slow to respond.
Try a known good keyboard.
1.  
Open System Preferences. Click on the keyboard and mouse icon. Adjust the “key repeat 
2.  
speed and delay until repeat” rate.
Replace the keyboard.
3. 
When I type, strange characters appear on the screen.
Depending on your iMac’s settings, a simple keystroke can change your keyboard from 
1.  
English to Japanese. This can result in some pretty funny characters showing up when you 
type. To switch to the US keyboard.
Open System Preferences. 
2.  
Click on the International icon. 
3. 
Click on the Input Menu near the top of the screen.
4.  
Scroll down the list and uncheck any non-US keyboard layouts.
5. 
Close the System Preferences. Try typing a few characters. Did is solve the problem? 
6.  
Yes: Problem solved.  
No: Replace the keyboard.
The USB port on my keyboard doesn’t work.
Unplug all devises from your keyboard.
1.  
Plug your Apple mouse into the left USB port on your keyboard. Does your mouse work 
2.  
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.
Now unplug the keyboard from the USB port on the back of the iMac, and plug the mouse 
3. 
into the port the keyboard had been in. Does the mouse work now? 
Yes: Replace the keyboard? 
No: It appears that your USB port isn’t functioning properly. Go on to step 4.
Replace the logic board.
4.  
Error Beep(s)
Refer to Power On Self Test (POST ) covered in the General Information section of this manual. 
						

							iMac (20-inch Late 2006) Troubleshooting — Symptom Charts 186
USB
A USB device doesn’t work
Please unplug all of your USB devices from your iMac except your Apple Keyboard and Apple 
1.  
mouse.
Now plug your device directly into the back of your iMac. Does it work as expected now? 
2.  
 
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 iMac and plug the keyboard into the port your device just 
occupied. Is your keyboard still working? 
  Yes: Your Apple Keyboard works when plugged into the USB port your device was 
plugged into. This points to an issue with your device. Please review the documentation that 
came with your device. Install any necessary drivers and contact the manufacturer of your 
device for assistance.  
  No: Replace the logic board
I see a message saying not enough power to function.
It appears that this device needs to be plugged into the computer’s USB port, rather than the 
keyboard USB port. Any USB device connected to the keyboard needs to be either a self-powered 
device (a USB device with its own AC power supply), or a low-power device (a device that does 
not need a large amount of voltage to operate). Your device may draw more power than the 
keyboard can provide. 
						

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© 2006 Apple Computer, Inc. All rights reserved.
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iMac (20-inch Late 2006) 
						

							iMac (20-inch Late 2006) — Views 188
iMac (20-inch Late 2006)—Upper Exploded View
Front Bezel, w/camera, 20”
922-7875
Camera Board
922-7833
Camera Board/IR Cable 922-7762
Bracket, LCD, Right
922-7004
Display Panel, LCD,
661-3895 (Samsung) 661-3881 (LG)
Bracket,LCD, Left 922-7005
Shield, EMI, Lower LCD  (not shown) 922-7770
LVDS Cable922-7251
Optical Bezel
922-6997, MKE
922-7109, Pioneer
Speakers
922-6988
Hard Drive
661-4026 250 GB
661-4027 500 GB
Cable,Hard Drive Sensor
922-7296
Hard Drive Temp Sensor
922-7242
Logic Board
661-4108, 2.16 GHz, 128
661-4109, 2.33 GHz, 128
661-4110, 2.16 GHz, 256
661-4111, 2.33 GHz, 256
661-4294, 2.16 GHz, 128
661-4295, 2.33 GHz, 128
661-4296, 2.16 GHz, 256
661-4297, 2.33 GHz, 256
Cable HD, Data, Sata 922-7252
 Inverter
661-4112 Optical Clip
922-7156
Optical Flex Cable
922-7160
Optical Drive w/Bezel, 8x
661-4028
Cable, Optical Sensor
922-6995
Fan, CPU
922-7763
Fan, Hard Drive
922-6993
HD Bracket w/ Grommets
922-7000
AirPort Card
661-4060 (VZL EEE code) J661-4060
Z661-4060
661-4289 (WQX EEE code)
Bluetooth Card
922-7289
Optical Drive Temp Sensor
922-7282
Wireless, Mouse
922-3916
Wireless, Mightly Mouse
661-3662
Cable, Power, AC/DC, SATA, Inverter
                          922-7761 
						

							iMac (20-inch Late 2006) — Views 18 9
iMac (20-inch Late 2006)—Lower Exploded View
Fan, Optical Drive
922-7298
Power Supply  AC/DC
661-3780
Cover,  
Clutch Mechanis m
922-700 7
Clutch,  Mechanis m
922-700 2
Cable, Ground, Power Suppl
y
                          922-776 0
Cable, Powe
r, AC/DC, SA TA, Inverter
                          922-776 1
Rear Housing
922-7769
SDRAM, SO-DIMM
661-41 14 512 MB, DDR2, 667
661-41 15 1GB, DDR2, 667
Not Shown:
Modem, External 661-3797
Battery 922-647 6
Power Cord 922-7139
Access  Tool 922-7172
Wireless Mighty Mouse 661-3662
Ambient Light Sensor 922-7759
Access Door , Memory
922-725 6
IR Board
922-7295
IR Bracket 922-7297
Apple Remot e
661-3756
Stand
922-776 8
Chassis
922-7258
AC Power Inlet 922-7767
Antenna,Bluetoot h
922-774 7
AirPort, Antenna, Wireles s
922-7764, Lef t
922-7766, Right 
						

							iMac (20-inch Late 2006) Screw Chart 190
Screw Chart
Screw Chart : iMac (20-inch Late 2006): page 1 
Note: Screws are not to scale.
922-6800                 T10
- LCD clips to front bezel
- AC Power Inlet to chassis
- Inverter board to rear cover
- Logic board to chassis
- Rear shield to rear cover
- Support channel to rear 
cover922-6850                 T10- Chassis to rear cover
922-6842                 T10- Power Supply board to rear 
cover
- Logic board to chassis
922-xxx               T10
Logic to chassis, longest logic 
board screw922-7011                 T8- Front bezel to bottom frame
922-7019                 T8- Hard drive clip to hard drive