Toshiba L600D 用户手册

To check if the computer’s display is malfunctioning or not, follow the troubleshooting 
procedures below as instructed. 

Procedure 1:  External Monitor Check 

Procedure 2:  Diagnostic Test Program Execution Check 

Procedure 3:  Connector and Cable Check 

Procedure 4:  Replacement Check 

Connect an external monitor to the computer’s external monitor port, then boot the computer.  
The computer automatically detects the external monitor.  

When “Power on Display” setting is “Auto-Selected” (Default) in BIOS Setup Menu. 
If this setting is “System LCD only”, external monitor cannot be displayed. The computer 
automatically detects the external monitor. 

If the external monitor works correctly, the internal LCD may be faulty. Go to Procedure 3. 

If the external monitor appears to have the same problem as the internal monitor, system 
board may be faulty. Go to Procedure 2. 

The Display Test program is stored in Diagnostics disk. This program checks the display 
controller on system board. Insert the Diagnostics disk, 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.