Apple Technician Guide MacBook Pro (17-inch, Early 2009) - tim.id.au

2010-06-11
Deep Dive
Check Result Action Code
1. Comparing internal speakers
with headphones, is the
distortion on both headphones
and speakers?
2. Use the Sound Output system
preference to test the left
and right speakers. If lower
bass notes are distorted, right
speaker/subwoofer may be
defective. Are all speakers free
of distortion, sounding clear
and loud?.
3. Is affected speaker cable
properly inserted and free
from damage?
4. Is affected speaker membrane
free from dust or debris, and
speaker membrane is not
deformed/damaged?
5. Verify that speaker enclosure
is not damaged, correctly
installed in system, and does
not create unneeded vibration
when sound is played.
6. Verify that internal speakers
no longer produce 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 bad speaker(s).
Yes Speaker housing and
installation is good. Go to
step 6.
No Properly install or replace
affected speaker. Go to step
6.
X09
X09
Yes Issue resolved. X09
No Replace logic board. M09
MacBook Pro (17-inch, Early 2009) Symptom Charts — Input/Output Devices 104