2.9 Display Troubleshooting 2 Troubleshooting Procedures
QOSMIO F20 Maintenance Manual (960-526) [CONFIDENTIAL] 2-49
Procedure 4 Replacement Check
The FL lamp, FL inverter, LCD module, system board, VG board (external GPU model) and
LCD/FL cable 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 lamp does not light, perform Check 1.
If characters or graphics on the internal display are not displayed clearly, perform
Check 4.
If some screen functions do not work properly, perform Check 4.
If the FL lamp remains lit when the display is closed, perform Check 5.
Check 1 Replace the FL lamp with a new one following the instructions in Chapter 4,
Replacement Procedures and test the display again. If the problem still exists,
perform Check 2.
Check 2 The LCD/FL cable may be defective or damaged. Replace the LCD/FL cable with
a new one following the instructions in Chapter 4, Replacement Procedure and test
the display again. If the problem still exists, perform Check 3.
Check 3 The FL inverter 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 Check 4.
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 6 (When the PC is an
external GPU model, perform Check 5).
Check 5 The VG board may be defective or damaged. Replace it with a new one following
the instructions in Chapter 4, Replacement Procedure. If the problem still exists,
perform Check 6.
Check 6 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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