2.8 Display Troubleshooting
This section describes how
to
determine
if
the T1900ff1900C's display is functioning
properly.
Start with Procedure 1 and continue with the other procedures as instructed.
Procedure
1:
Contrast Control Check
Procedure
2:
External CRT Check
Procedure
3:
Diagnostic Test Program Execution Check
Procedure
4: Connector Check
Procedure
5: Replacement Check
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 T
1900ff
1900C' 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 T1900ff1900C 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.
Ifan
error is detected,
go
to
Procedure 4.
Ifan
error is not detected, the display is
functioning properly.
2-24
To Next Page
Loading...
