Display Troubleshooting Procedures; Procedure 1 Brightness And Contrast Volume Check; Procedure 2 External Crt Check; Procedure 3 Diagnostic Test Program Execution Check - Toshiba T3300SL Maintenance Manual

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Display Troubleshooting Procedures

This section describes how to determine if the T3300SL's display is functioning properly. Start
with Procedure 1 and continue with the other procedures as instructed. The procedures described
in this section are:
Procedure 1: Brightness and Contrast Volume Check
Procedure 2: External CRT Check
Procedure 3: Diagnostic Test Program Execution Check
Procedure 4: Connector Check
Procedure 5: Replacement Check
Procedure 1 Brightness and Contrast Volume Check
The brightness and contrast dials are on the right side of the display unit. Use these dials to adjust
the display screen.
If the brightness or contrast does not change when you adjust them, go to Procedure 2.
Procedure 2 External CRT Check
Connect the external CRT to T3300SL's RGB port, then cold boot the computer. The computer
automatically detects the external CRT.
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 T3300SL Diagnostic Disk. This program checks the
display controller on the system board. After loading Toshiba MS-DOS, run the Diagnostic Pro-
gram (TESTCE33). Refer to Chapter 3, Tests and Diagnostics, for detailed instructions about this
test.
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