Toshiba M500 ST5405 Maintenance Manual - Page 89

2.8 Display Troubleshooting 2 Troubleshooting Procedures 2.8 Display Troubleshooting This section describes how to determine if the computer's display is functioning properly. Start with Procedure 1 and continue with the other procedures as instructed. Procedure 1: External Monitor Check Procedure 2: Diagnostic Test Program Execution Check Procedure 3: Connector Check and Cable Check Procedure 4: Replacement Check Procedure 1 External Monitor Check Connect an external monitor and turn on the computer. If there is no problem on it, the internal LCD may be defective. Go to Procedure 3. If there is any problem on the external monitor, the system board may be defective. Go to Procedure 2. Procedure 2 Diagnostic Test Program Execution 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. Procedure 3 Connector Check and Cable Check Check 1 The LCD, FL, FL Inverter Board and System Board are connected by the HV cable and LCD/FL cable as shown bellow. Check the connections. The connectors may be disconnected or damaged. Disassemble the computer following the steps described in Chapter 4, Replacement Procedures. PORTÉGÉ M500 Maintenance Manual (960-559) [CONFIDENTIAL] 2-47