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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.
Satellite A40 Maintenance Manual (960-458) 2-47