Apple MD094LL/A 사용자 설명서
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
file. Verify if sound quality is
acceptable.
Yes
Suspect bad speaker.
Go to step 4.
No
Audio CODEC or amplifier
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 amplifier 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
• No audio from one or both
speakers.
• Audio from speakers distorted
1. Confirm 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.