Toshiba A20-S259 - Satellite - Pentium 4 2.66 GHz Maintenance Manual page 94

2 Troubleshooting Procedures
Procedure 3 Connector and Replacement Check
The FL, FL inverter, LCD module, and system board are connected to the 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 2.
If some screen functions do not operate properly, perform Check 3.
If the FL remains lit when the display is closed, perform Check 4.
Check 1 Replace the FL inverter with a new one and test the display again. If the problem still
exists, perform Check 2.
Check 2 The FL cable or HV cable may be defective or damaged. Replace the FL or HV cable
with a new one and test the display again. If the problem still exists, perform Check3.
Check 3 The LCD module may be defective or damaged. Replace the LCD module with a
new one and test the display again. If the problem still exists, perform Check 4.
Check 4 The FL cable may be defective or damaged. Replace the FL cable with a new one 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.
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2.8 Display Troubleshooting
Satellite A20 Maintenance Manual (960-444)