Toshiba M200-ST2002 Maintenance Manual - Page 78

2 Troubleshooting Procedures 2.8 Display Troubleshooting 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: Diagnostic Test Program Execution Check Procedure 2: Connector and Cable Check Procedure 3: Fuse Conduction Check Procedure 4: Replacement Check Procedure 1 Diagnostic Test Program Execution Check The Display Test program is stored on the Diagnostics disk. 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. This program checks the display controller on the system board. If an error is detected, go to Procedure 3. Procedure 2 Connector and Cable Check The LCD module is connected to the system board through the LCD harness. The cable may be disconnected from each board or damaged. Disassemble the computer following the steps described in Chapter 4, Replacement Procedures. If the connection is loose, reconnect firmly and repeat Procedure 2. If there is still an error, go to Procedure 3. Procedure 3 Fuse Conduction check Some fuses may be blown. To test the conduction of the fuse F2, F5000 and F5001 near the LCD I/F connector (PJ5205, PJ5206), disassemble the computer following the steps described in Chapter 4, Replacement Procedures. If either fuse is blown, replace the system board repeat Procedure 3. If there is still an error, go to Procedure 4. 2-40 Portege M200 Maintenance Manual (960-457)