Apple Technician Guide - tim.id.au
Apple Technician Guide - tim.id.au
Apple Technician Guide - tim.id.au
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2010-08-05<br />
3. Verify that you now get <strong>au</strong>dio<br />
through internal speakers .<br />
4. Disconnect known-good<br />
headphones or speakers.<br />
Verify that you now get <strong>au</strong>dio<br />
through internal speakers.<br />
Yes Issue resolved.<br />
No Replace logic board. M09<br />
Yes Issue resolved.<br />
Distorted Sound from Internal Speaker<br />
Unlikely c<strong>au</strong>se: LCD, hard drive, optical drive<br />
Quick Check<br />
Symptom Quick Check<br />
Distorted Sound from Internal<br />
Speaker<br />
• Distorted <strong>au</strong>dio<br />
Deep Dive<br />
No Replace affected speaker(s). X08<br />
1. Reset PRAM.<br />
2. Adjust sound output and level in System<br />
Preferences: Sound: Output, and use the Balance<br />
to locate a left, right, or woofer speaker distortion<br />
source.<br />
3. Compare the same sound and same settings<br />
against another unit to make sure the sound is<br />
actually distorting.<br />
Check Result Action Code<br />
1. Comparing internal speakers<br />
with headphones, is the<br />
distortion on both headphones<br />
and speakers?<br />
Yes Audio source or gain issue.<br />
Reset PRAM, adjust sound<br />
level in System Preferences:<br />
Sound: Output, and retest<br />
with known-good <strong>au</strong>dio<br />
source and external speakers.<br />
Go to step 5.<br />
No Internal speaker issue. Go to<br />
step 2.<br />
MacBook Pro (15-inch, 2.53 GHz, M<strong>id</strong> 2009) Symptom Charts — Input/Output Devices 105
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