Display Troubleshooting; Procedure 1 External Monitor Check; Procedure 2 Diagnostic Test Program Execution Check; Procedure 1 - Toshiba Satellite L640 Maintenance Manual

Chapter 2 Troubleshooting Procedures

2.8 Display Troubleshooting

T o check if the computer's display is malfunctioning or not, follow the troubleshooting
p rocedures below as instructed.
Procedure 1: External Monitor Check
P rocedure 2: Diagnostic Test Program Execution Check
Procedure 3: Connector and Cable Check
Procedure 4: Replacement Check

Procedure 1

External Monitor 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 extern al monitor works correctly, the internal LCD may be faulty. Go to Procedure 3.
If the extern al monitor appears to have the same problem as the internal monitor, system
b oard may be faulty. Go to Procedure 2.
Procedure 2 Diagnostic Test Program Execution Check
The Display Test program is stored in Diagnostics d
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.
Satellite L600/L640/L645, Satellite Pro L600/Pro L640/Pro L645 Maintenance Manual (960-Q08)
isk. This program checks the display