2 Troubleshooting Procedures
Procedure 3 Connector and replacement check
The FL inverter board, 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:
Check 1 Make sure the DDR RAM module is seated properly. Test display again. If the problem still exits, replace the DDR RAM module. If the problem still exists, perform Check 2.
Check 2 Replace the FL inverter board with a new one and test display again. If the problem still exists, perform Check 3.
Check 3 Replace the LCD module with a new one and test display again. If the problem still exists, perform Check 4.
Check 4 Replace the LCD/FL cable with a new one and test display again. If the problem still exists, perform Check 5.
Check 5 Replace the CPU with another of the same specifications. If the problem still exists, perform Check 6.
Check 6 The system board may be damaged. Replace it with a new one.
Satellite L450D/455D, Satellite pro L450D Series Maintenance Manual
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