Troubleshooting ProceduresQosmio X500 Maintenance Manual (960-Q08) 30Procedure 4 Replacement CheckFluorescent lamp, FL inverter, LCD module, HV cable and LCD/FL cable are connected todisplay circuits. Any of these components may be faulty. Refer to Chapter 4, ReplacementProcedures, for instructions on how to disassemble the computer and then perform thefollowing checks:If LED backlight does not light, perform Check 1.If characters or graphics on the internal display are not displayed clearly, performCheck 3.If some screen functions do not operate properly, perform Check 3.If LED backlight remains lit when the display is closed, perform Check 4.Check 1 LCD/FL cable may be faulty. Replace FL/LCD cable with a new one following theinstructions in Chapter 4, Replacement Procedure and test the display again. If theproblem still occurs, perform Check 2.Check2 FL inverter may be faulty. Replace FL inverter with a new one following theinstructions in Chapter 4, Replacement Procedure and test the display again. If theproblem still occurs, perform Check 3.Check 3 LCD module may be faulty. Replace LCD module with a new one following theinstructions in Chapter 4, Replacement Procedure and test the display again. If theproblem still occurs, perform Check 4.Check 4 System board may be faulty. Replace it with a new one following the instructionsin Chapter 4, Replacement Procedure.
