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iMac (24-inch Mid 2007) Take Apart — Symptom Charts 235
iChat AV connection doctor feature to verify that there is sucient bandwidth to have a
video iChat session without a signicant degradation of image quality.
No: The camera may not be functioning normally. Replace the front bezel for poor image
quality. If the issue persists, replace the camera board 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 input2. .
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 camera/microphone cable attached to the camera board inside the front
bezel. If the cable is damaged, replace the front bezel and retest. If the issue persists, replace
the camera/microphone cable.
Audio quality is 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?
Yes: 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 sucient bandwidth to have an
audio iChat session without a signicant 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.
Check connections on the Audio board. If the problem persists, replace the Audio board.3.