Toshiba Qosmio F40 Maintenance Manual page 55

2.7 Display
Check 3 The FL may be faulty. Replace it with a new one and return to Procedure
3. If there is still an error, perform Check 4.
Check 4 The FL inverter board may be faulty. Replace it with a new one and
return to Procedure 3. If there is still an error, perform Check 5.
Check 5 Make sure the LCD/FL cable has been firmly connected to the system
board and LCD module.
FL inverter board
If the cable is loose or off, reconnect it firmly and return to Procedure 3.
If there is still an error, perform Check 6.
Check 6 The LCD/FL inverter cable may be faulty. Replace it with a new one and
return to Procedure 3. If there is still an error, perform Check 7.
Check 7 The LCD module may be faulty. Replace it with a new one and return to
Procedure 3. If there is still an error, perform Check 8.
Check 8 The System board may be faulty. Replace it with a new one. If there is
still an error, perform Check 9.
Check 9 The CPU may be faulty. Replace it with a new one following the
instructions in Chapter 4.
Check 10 The memory may be defective. Replace the memory module with a new
one following the steps described in Chapter 4. If the problem persists,
perform Check 10.
Qosmio F40/F45 Maintenance Manual
System board
LCD/FL cable
2 Troubleshooting
CPU
2-17