Apple Macbook Pro Aluminum 13-Inch Black Laptop Keyb Technical Guide - Page 103

2010-06-15 2. Use the Sound Output system Yes preference to test the left and right speakers. If lower No 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 Yes properly inserted and free from damage? No 4. Is affected speaker membrane Yes free from dust or debris, and speaker membrane is not No deformed/damaged? 5. Verify that speaker enclosure Yes is not damaged, correctly installed in system, and does not create unneeded vibration when sound is played. No 6. Verify that internal speakers Yes no longer produce distorted sound. No Issue resolved. Adjust volume to test full range of volume settings. Go to step 3. Go to step 4. Reseat speaker cable or X09 replace damaged speaker. Go to step 5. Go to step 5. Clean any dust or debris. Go X09 to step 5. If membrane is damaged, replace the bad speaker(s). Speaker housing and installation is good. Go to step 6. Properly install or replace affected speaker. Go to step 6. Issue resolved. X09 Replace logic board. M09 Uncategorized Symptom Quick Check Symptom Uncategorized Symptom Unable to locate appropriate symptom code Quick Check Verify whether existing symptom code applies to the issue reported by the user. If not, document reported symptom and send feedback to smfeedback@apple. com stating that a suitable symptom code could not be found. MacBook (13-inch, Aluminum, Late 2008) Symptom Charts - Input/Output Devices 103