iMac (27-inch, Mid 2010) Symptom Charts — Input/Output Devices 98
2010-09-09
3. Connect external speakers or
headphones to audio-out port
and play a known-good sound
le. Verify if sound quality is
acceptable.
Yes Suspect bad speaker.
Go to step 4.
No Audio CODEC or amplier
issue suspected. Replace logic
board and retest.
M09
4. Inspect LEFT and RIGHT
speaker cones and speaker
connection cable for damage.
Verify if speakers have visible
damage.
Yes Replace damaged speaker.
Retest.
L11
No Go to step 5.
5. Install known-good speaker
into location where distorted
sound was heard. Verify if
sound quality improves.
Yes Replace speaker. L11
No Speaker amplier issue
suspected. Replace logic
board.
M09
Audio: No Audio from Built-in Speakers
Unlikely cause: LCD display, power supply, hard drive, optical drive, fans
Quick Check
Symptoms Quick Check
Audio: Built-in Speakers Have No
Audio
• No audio from one or both
speakers.
• Audio from speakers distorted
1. Conrm correct version of Mac OS X is installed.
See kBase #TS1574: Troubleshooting issues
with bi audio from built-in speakers on Macs
2. Go to System Preferences > Sound > Output.
Verify that sound output device is set to internal
speakers.
3. Go to System Preferences > Sound > Output.
Verify that “Output volume” setting is set above
the minimum level and that “Mute” checkbox is
not selected.
4. Go to System Preferences > Sound > Output.
Verify that “Balance” slider is set to middle
position so left and right speakers are both used.