Display Troubleshooting - Toshiba T2150 series Maintenance Manual

2.8

Display Troubleshooting

This section describes how to determine if the T2150 series 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 (T2150CDS only)
Contrast is changed by the contrast dial.
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 T2150 series 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 Proce-
dure 4.
If the external CRT appears to have the same problem as the internal LCD, the display con-
troller may be damaged. Go to Procedure 3.
Procedure 3 Diagnostic Test Program Execution Check
The Display Test program is stored on the T2150 series Diagnostic Disk. This program
checks the display controller on the system board. 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 function-
ing properly.
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Contrast Control Check (T2150CDS only)
External CRT Check
Diagnostic Test Program Execution Check
Connector Check
Replacement Check
T2150 Series