Check 1 - Toshiba Tecra 700CS Maintenance Manual

2.8 Display and FSTIP* Board 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:
Procedure 2:
Procedure 3:
Procedure 4:
Procedure 5:
Procedure 1 Contrast Control Check (DSTN display only)
Contrast is changed by the contrast dial. If the display is blank, go to Check 1. If you cannot
change the contrast, go to Procedure 3.

Check 1

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 computer'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 computer Diagnostics Disk. This program checks
the display controller on the system board. 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.
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 (DSTN display only)
External CRT Check
Diagnostic Test Program Execution Check
Connector Check
Replacement Check
700 Series