3. Connect external speakers or

Yes

Suspect bad speaker.

 

headphones to audio-out port

 

Go to step 4.

 

and play a known-good sound

 

 

 

No

Audio CODEC or amplifier

M09

file. Verify if sound quality is

 

issue suspected. Replace logic

 

acceptable.

 

 

 

board and retest.

 

 

 

 

 

 

 

 

4. Inspect LEFT and RIGHT

Yes

Replace damaged speaker.

L11

speaker cones and speaker

 

Retest.

 

connection cable for damage.

 

 

 

No

Go to step 5.

 

Verify if speakers have visible

 

 

 

 

damage.

 

 

 

 

 

 

 

5. Install known-good speaker

Yes

Replace speaker.

L11

into location where distorted

 

 

 

sound was heard. Verify if

 

 

 

No

Speaker amplifier issue

M09

sound quality improves.

 

 

suspected. Replace logic

 

 

 

board.

 

 

 

 

 

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

1.

Confirm correct version of Mac OS X is installed.

Audio

 

See kBase #TS1574: Troubleshooting issues

• No audio from one or both

 

with bi audio from built-in speakers on Macs

speakers.

2.

Go to System Preferences > Sound > Output.

• Audio from speakers distorted

 

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.

 

 

 

2010-09-09

iMac (27-inch, Mid 2010) Symptom Charts — Input/Output Devices  98

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Image 98
Apple MD094LL/A Audio No Audio from Built-in Speakers, Symptoms Quick Check, See kBase #TS1574 Troubleshooting issues