Display Troubleshooting - Toshiba Portege 2000 Maintenance Manual

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: 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 main board. If an error is detected, go to
Procedure 3.
Procedure 2 Connector and Cable Check
The LCD module is connected to the main 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 F1 and F2 near the I/F connector
(PJ34/PJ35), 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.
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2.8 Display Troubleshooting
Portege 2000 Maintenance Manual (960-333)