Apple MC408LL Apple Technician Guide - Page 84

Deep Dive Check 1. Run latest available service utilities to check the thermal sensors and fan functional states. Was an error generated? 2. Does noise sound like fan is running faster than expected? 3. If an optical drive is present, does the noise change when the optical drive is being accessed or media is inserted or ejected? 4. Mute the system volume. Verify whether the issue still occurs. 5. Remove bottom cover, disconnect AirPort antenna and remove shield, disconnect and remove fan and rotate its blades. Verify that fan blades spin smoothly without interference from fan housing and does not produce abnormal noise. Result Yes Action Check fan connection to logic board and retest. No Go to step 2. Yes Reset SMC by disconnecting power cord for ~15 seconds then retest. If issue continues go to step 3. No Go to step 5. Yes Suspect issue with optical drive or the media being used. Jump to 'Optical Drive Noisy symptom flow for additional information. No Go to step 4. Yes Go to step 5. No Suspect issue with speaker or audio amplifier circuitry. Go to 'Distorted Sound From Internal Speaker' symptom flow for additional information. Yes Fan reseated, blades rotate, noise gone. No Reinstall fan , making sure that the blades do not interfere with other elements or cable routings when installed and retest. If fan does not correctly spin or has broken blade, replace affected fan. Code X23 2010-08-03 Mac mini (Late 2009) Symptom Charts - Mechanical 84