2 Troubleshooting 2.8 Display Troubleshooting
Procedure 3 Connector and Cable Check
The LCD module is connected to the System board through the LCD/FL cable. Also, the FL
inverter is connected the System board through the LCD/FL cable. The cable may be firmly
disconnected the board or damaged. Disassemble the computer following the steps described
in Chapter 4, Replacement Procedures. If the connection is loose, reconnect the cable firmly
and repeat Procedure 2. If there is still an error, go to Procedure 4.
Procedure 4 Replacement Check
(1) If characters or graphics are not displayed on the internal display, perform Check 1.
(2) If characters or images are displayed on the internal display but the display is not
normal, perform Check 2.
(3) If characters or images are displayed on the internal display but the display is dark (the
back-light does not light), perform Check 5.
Check 1 The display ON/OFF switch may be damaged. Replace it with a new one following
the instructions in Chapter 4, Replacement Procedures
and test the display again. If
there is still an error, go to Check 2.
Check 2 The LCD/FL cable may be damaged. Replace it with a new one following the
instructions in Chapter 4, Replacement Procedures
and test the display again. If
there is still an error, go to Check 3.
Check 3 The LCD may be damaged. Replace it with a new one following the instructions in
Chapter 4, Replacement Procedures
and test the display again. If there is still an
error, go to Check 4.
Check 4 The FL inverter may be damaged. Replace it with a new one following the
instructions in Chapter 4, Replacement Procedures
and test the display again. If
there is still an error, go to Check 5.
Check 5 The FL tube may be damaged. Replace it with a new one following the instructions
in Chapter 4, Replacement Procedures
and test the display again. If there is still an
error, go to Check 6.
Check 6 The System board may be damaged. Replace it with a new one following the
instructions in Chapter 4, Replacement Procedures.
2-42 [CONFIDENTIAL] PORTEGE M400 Maintenance Manual (960-541)
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