 Apple Technician Guide MacBook Pro (15-inch, Mid ... - tim.id.au

2010-08-05
Deep Dive
Check Result Action Code
1. Compare internal speakers
with a pair of headphones and
verify if the distortion is similar
on both headphones and
internal speakers.
2. Use the Sound Output
system preference to adjust
Balance and test the left and
right speakers. If lower bass
notes are distorted, the right
speaker/subwoofer assembly
is likely to be defective. Verify
if all speakers are free from
distortion, and sounding clear
and loud.
3. Verify if affected speaker cable
is properly seated and free
from damage.
4. Verify if affected speaker
membrane is free from dust or
debris, and speaker membrane
is not deformed/damaged.
5. Verify if speaker enclosure
is not damaged, is correctly
installed in system, and does
not create unneeded vibration
when sound is played.
6. Verify if internal speakers no
longer produces distorted
sound.
Yes Audio source or gain issue.
Reset PRAM, adjust sound
level in System Preferences:
Sound: Output, and retest
with known-good audio
source and external speakers.
Go to step 5.
No Internal speaker issue. Go to
step 2.
Yes Issue resolved.
No Adjust volume to test full
range of volume settings. Go
to step 3.
Yes Go to step 4.
No Reseat speaker cable or
replace damaged speaker. Go
to step 5.
Yes Go to step 5.
No Clean any dust or debris. Go
to step 5.
If membrane is damaged,
replace the speaker(s).
Yes Speaker housing installation
is good. Go to step 6.
No Properly install/ replace
affected speaker. Go to step 6.
Yes Issue resolved.
X09
X09
No Replace logic board. M09
MacBook Pro (15-inch, Mid 2010) Symptom Charts — Input/Output Devices 98