Specifications

iMac (Early 2006 17-inch) Troubleshooting — Symptom Charts 158
Speakers
Can’t hear sound from the speakers.
Disconnect any external microphones, speakers, or headphones.
Access System Preferences and select Sound. In the Sound pane, select Output and make
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
Macintosh” appears. Do you have sound now?
Yes: Problem resolved.
No: Go to the next step.
Verify that the speaker cable connector is securely attached to the logic board. Do you have
sound now?
Yes: Problem resolved.
No: Replace the speakers.
After replacing the speakers, do you have sound now?
Yes: Problem resolved.
No: Replace the logic board.
No audio from internal speakers (may hear a faint putt-putt or motorboating
noise)
One method for isolating this issue from other no audio issues is to:
Open the sound preference pane.
Click on the ‘output’ tab.
Plug in a set of earbuds or external speakers and verify that the ‘plug detect’ feature
is working (the Port setting should change as the external speakers are plugged and
unplugged)
If the plug detect feature is NOT working then replace the logic board after rst verifying
that the external speakers are being plugged into the correct port.
If the plug detect feature IS working, AND the external audio works then continue to the
next step.
Remove front bezel and diaper to expose the speakers. Carefully inspect the speaker cable to
determine if it has been punctured on any component leads. Add electrical tape (kapton is
OK too) to the punctured area and then reroute the cable as shown in the picture to prevent
further damage.
Retest the internal speakers to make sure that the audio has been restored and that the ‘putt
putting’ sounds are gone.
1.
2.
3.
4.
5.
1.
2.
3.
4.
5.
6.
7.