Toshiba Portege M100 Maintenance Manual - Page 83

2.8 Display Troubleshooting 2 Troubleshooting Procedures Procedure 4 Replacement Check The FL, FL inverter board, LCD module, and system board are connected to display circuits. Any of these components may be damaged. Refer to Chapter 4, Replacement Procedures, for instructions on how to disassemble the computer and then perform the following checks: If the FL does not light, perform Check 1. If characters or graphics are not displayed clearly, perform Check 4. If some screen functions do not operate properly, perform Check 4. If the FL remains lit when the display is closed, perform Check 5. Check 1 Replace the FL with a new one following the instructions in Chapter 4, Replacement Procedures and test the display again. If the problem still exists, perform Check2. Check 2 The LCD/FL cable or HV cable may be defective or damaged. Replace the FL/LCD or HV cable with a new one following the instructions in Chapter 4, Replacement Procedure and test the display again. If the problem still exists, perform Check3. Check 3 The FL inverter board may be defective or damaged. Replace the FL inverter board with a new one following the instructions in Chapter 4, Replacement Procedure and test the display again. If the problem still exists, perform Check4. Check 4 The LCD module may be defective or damaged. Replace the LCD module with a new one following the instructions in Chapter 4, Replacement Procedure and test the display again. If the problem still exists, perform Check 5. Check 5 The system board may be defective or damaged. Replace it with a new one following the instructions in Chapter 4, Replacement Procedure. PORTEGE M100 Maintenance Manual (960-452) 2-41