Toshiba TECRA A9 Series Maintenace Manual page 93

2 Troubleshooting Procedures
If the connection is loose, reconnect firmly and restart the computer. If there is still an error,
go to Procedure 4.
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:
1. If the FL does not light, perform Check 1.
2. If characters or graphics are not displayed clearly, perform Check 1.
3. If some screen functions do not operate properly, perform Check 2.
4. If the FL remains lit when the display is closed, perform Check 4.
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 Replace the LCD module with a new one following the instructions in Chapter 4,
Replacement Procedures and test the display again. If the problem still exists,
perform Check 3.
Check 3 Replace the display cable (FL cable and LCD cable) with a new one following the
instructions in Chapter 4, Replacement Procedures and test the display again. If
the problem still exists, perform Check 4.
Check 4 The display controller on the system board may be damaged. Replace the system
board with a new one following the instructions in Chapter 4, Replacement
Procedures.
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2.8 Display Troubleshooting