Apple Mac mini Late 2009 (Technician Guide) - Manual (Page 64)

Mac mini (Late 2009) Symptom Charts — Input/Output Devices 64 2009-11-03
Audio: Built-in Speaker Has Distorted Sound
Quick Check
Symptoms Quick Check
Audio: Built-in Speakers Have
Distorted Sound
No audio from one or both •
speakers.
Audio from speakers distorted
•
Launch System Preferences and select Sound/ 1.
Output options. Verify that the sound output
option is set to system’s internal speakers and
that the balance control is set to the center
position.
Obtain known good high quality sound file
2.
or use iTunes music store sound samples to
evaluate sound quality. Verify suspect sound files
on another system to determine whether the
distortion is caused by the system or the sound
file.
Set volume control to mid-range. Overdriving the
3.
built-in speakers can cause distortion.
Deep Dive
Check Result Action Code
Launch System Preferences and 1.
select Sound/Output options.
Set speaker balance to the
middle, then play a sound file.
Verify that sound is generated
by the speaker and that the
sound quality is acceptable.
Yes Speaker and amplifier
circuitry OK. Go to step 3.
No Distortion detected in
speaker. Go to step 2
Connect external speakers or 2.
headphones to Headphone
Out port then play a sound
file. Verify that sound quality is
acceptable.
Yes Suspect bad speaker. Go to
step 3.
No Audio CODEC or amplifier
issue suspected. Replace
audio board. Retest.
M09
Inspect speaker cones and 3.
speaker connection cable for
damage. Does the speaker have
visible damage.
Yes Replace damaged speaker.
Retest.
M09
No Go to step 4.