Apple Macbook Pro Aluminum 13-Inch Black Laptop Keyb Technical Guide - Page 71

Deep Dive: Vertical/Horizontal Lines Check Result 1. Horizontal lines may be related Yes to a failing RAM module. Verify if video issue only happens AFTER the Apple logo and the spinning wheel has appeared. No 2. Start with shift key down Yes (safe mode) to disable system extensions. Verify if issue still No happens when booting in safe mode. 3. Isolate with only one memory Yes module installed , then with the other one. Test with known-good memory. Verify No that issue only happens with specific RAM module(s). Action Issue only happens AFTER Apple logo and spinning wheel appears. Go to step 2. Code Issues happens since startup. Go to step 5. Go to step 5. No video issue when booting in safe mode. Go to step 3. Replace affected RAM X02 module. Go to step 4 4. Isolate with one known-good Yes memory module installed in one of the memory slots. Repeat by testing in the other No memory slot with knowngood memory module. Verify that issue only happens with specific memory slot on logic board. 5. Run Clamshell Service Yes Diagnostic utility and check for LCD panel presence. If not found, reseat the LVDS cable No to the logic board internal video output. Is normal video restored? 6. Connect external compatible Yes DisplayPort display (or DisplayPort adapter and display). Verify if correct video appears on external display. No Replace logic board. M07 Go to step 5 Issue resolved by reseating loose LVDS cable.. Go to step 6 Go to step 7. Replace logic board M04 2010-06-15 MacBook (13-inch, Aluminum, Late 2008) Symptom Charts - Display 71