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

2010-06-11
Deep Dive
Check Result Action Code
1. Check System Preferences:
Sound: Output and verify that
no external speakers, “Digital
Out,” or headphones are being
reported connected when
there is none present.
2. With known-good headphone
or speakers, plug in the audio
output jack for several cycles.
Verify that you get audio
through external headphones/
speakers when connected.
3. Verify that you now get audio
through internal speakers .
4. Disconnect known-good
headphones or speakers.
Verify that you now get audio
through internal speakers.
Yes Audio-out port is not
damaged. Go to step 3.
No Go to step 2
Yes Go to step 4
No Reseat the speaker
connectors to logic board. Go
to step 3.
Yes Issue resolved.
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 Replace affected speaker(s). X08
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 (17-inch, Early 2009) Symptom Charts — Input/Output Devices 103