2-28
710CDT/720CDT
2.8
Display 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:
External Monitor Check
Procedure 2:
Diagnostic Test Program Execution Check
Procedure 3:
Connector Check
Procedure 4:
Replacement Check
Procedure 1
External Monitor Check
Connect the external monitor to the computer's external monitor port, then boot the computer.
The computer automatically detects the external monitor even if Resume mode is enabled.
❑
If the external monitor works correctly, the internal LCD display may be damaged. Go
to Procedure 3.
❑
If the external monitor appears to have the same problem as the internal LCD, the
display controller may be damaged. Go to Procedure 2.
Procedure 2
Diagnostic Test Program Execution Check
The Display Test program is stored on the computer's Diagnostic Disk. This program checks
the display controller on the system board. Insert the Diagnostics disk into the computer’s
floppy disk drive, turn on the computer, and run the test. Refer to
Chapter 3
,
Tests and Diag-
nostics
, for details.
If an error is detected, go to Procedure 3. If an error is not detected, the display is functioning
properly.
Procedure 3
Connector Check
The Display unit has an LCD module, FL, display switch, and FL inverter board. The FL and
FL inverter board are connected by two cables, and the LCD module and system board are
connected by one signal cable as shown in Figure 2-3. Any of these cables may be discon-
nected.
Disassemble the display unit and check the cable connections shown in Figure 2-3. Refer to
Chapter 4
,
Replacement Procedures
, for more information about how to disassemble the
computer.
Summary of Contents for Tecra 710CDT
Page 187: ...B 2 710CDT 720CDT B 2 System Board Back View Figure B 2 System board layout back ...
Page 207: ...C 16 710CDT 720CDT ...
Page 221: ...G 2 710CDT 720CDT ...
Page 222: ...710CDT 720CDT G 3 ...