Apple Macbook Pro Aluminum 13-Inch Black Laptop Keyb Technical Guide - Page 38

2010-06-15 8. Verify if a thermal sensor or fan Yes -If fan not running failure, failure is reported in ASD or check for fan cable seating other available service utility. and retest. If same failure after retest replace fan with X22 known-good fan and retest. If issue does not happen with known-good fan, replace user's fan. -If an over temp failure reported, check for cause of over temp, like obstructed vent, dust in heatsink fin, clogged fan and retest. If still failing replace part where sensor is located (logic M23 board, battery, or trackpad) P17 according to the sensor K99 location table . Go to step 9 No Replace Thermal module X10 Go to step 9 9. Isolate if issue solved Yes Issue fixed Verify if shutdown/issue does not happen anymore after part No Replace logic board with exchange. corresponding symptom: -if for thermal error cause M18 -if for other cause M08 No Video/Bad Video Unlikely cause: hard drive, optical drive, top case, battery, power adapter Quick Check Symptom Power, but No Video • Power • No video • fan, hard drive spin, or optical drive reset sound • sleep LED is on or went on • light if Caps Lock pressed Quick Check 1. Reset SMC. 2. Reset PRAM. 3. If no startup chime, verify with known-good memory. 4. Verify with external monitor. 5. Press Alt key on startup.. MacBook (13-inch, Aluminum, Late 2008) Symptom Charts - Startup and Power Issues 38