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

2010-08-05
2. Play some music and plug
known-good headphones
/speakers in the audio
output jack .Verify if you get
audio through the external
headphones/speakers.
3. Unplug headphone/speakers
and verify if you now get audio
through internal speakers
.Cycle this plug /unplug
operation several times and
verify if audio gets back each
time to the Internal speakers.
4. Replace with known-good
internal speakers. Verify if
you now get audio through
internal speakers.
Yes Go to step 3
No Replace logic board. M09
Yes Issue resolved.
Distorted Sound from Internal Speaker
Unlikely cause: LCD, hard drive, optical drive
Quick Check
Symptom Quick Check
Distorted Sound from Internal
Speaker
• Distorted audio
No Check left and right speakers
connections to logic board.
-If disconnected, reseat
connectors.
-If damaged or missing,
replace affected speaker.
- Otherwise, go to step 4.
Yes Replace affected user’s
speaker Issue resolved.
X08
X08
No Replace logic board. M09
1. Reset PRAM.
2. Adjust sound output and level in System
Preferences: Sound: Output, and use the Balance
to locate a left, right, or woofer speaker distortion
source.
3. Compare the same sound and same settings
against another unit to make sure the sound is
actually distorting.
MacBook Pro (15-inch, Mid 2010) Symptom Charts — Input/Output Devices 97