Display Troubleshooting - Toshiba T1950 User Manual

2.8

Display Troubleshooting

This section describes how to determine if the T1900/T1900C's display is functioning
properly. Start with Procedure 1 and continue with the other procedures as instructed.
Procedure 1:
Procedure 2:
Procedure 3:
Procedure 4:
Procedure 5:
Procedure 1 Contrast Control Check
Contrast is changed by the contrast dial. If the display is blank, go to Check 1. If you cannot
change the brightness and contrast, go to Check 3.
If the contrast does not change when you turn the contrast dial, perform Procedure 2.
Procedure 2 External CRT Check
Connect the external CRT to the T1900/T1900C's external monitor port, then boot the
computer. The computer automatically detects the external CRT even if Resume mode is
enabled.
If the external CRT works correctly, the internal LCD display may be damaged. Go to
Procedure 4.
If the external CRT appears to have the same problem as the internal LCD, the display
controller may be damaged. Go to Procedure 3.
Procedure 3 Diagnostic Test Program Execution Check
The Display Test program is stored on the T1900/T1900C Diagnostic Disk. This program
checks the display controller on the upper system board (FATSU*). After loading Toshiba
MS-DOS, run the Diagnostic Program. Refer to Chapter 3, Tests and Diagnostics, for details.
If an error is detected, go to Procedure 4. If an error is not detected, the display is functioning
properly.
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Contrast Control Check
External CRT Check
Diagnostic Test Program Execution Check
Connector Check
Replacement Check