NBLB2 Service Manual
This section describes how to determine if the computer‟s display is functioning
properly. The process is outlined in Figure 6-3. Start with Procedure 1 and continue
with the other procedures as instructed.
Procedure 1: External display check
Procedure 2: Diagnostic check
Procedure 3: Connector and replacement check
4.1 Procedure 1 External display check
Connect an external display to the computer‟s external monitor port, then boot the
computer. The computer automatically detects the external display. Press Fn+F3 to
switch to the external display.
If the external display works correctly, the internal LCD may be damaged. Go to
Procedure 3.
If the external monitor appears to have the same problem as the internal monitor, the
system board may be damaged. Go to Procedure 2.
4.2 Procedure 2 Diagnostic check
The Display Test program is stored on the computer‟s Diagnostics disk. This program
checks the display controller on the system board. Insert the Diagnostics disk in the
computer‟s floppy disk drive, turn on the computer and run the test. Refer to Chapter
3, Tests and Diagnostics for details.
If an error is detected, go to Procedure 3. If an error is not detected, the display is
functioning properly.
4.3 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. Replacement Procedures, for
instructions on how to disassemble the computer and then perform the following
checks:
Check 1
Make sure the DDRRAM module is seated properly. Test display again.
If the problem still exits, replace the DDRRAM 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.
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