T4900CT
Procedure 3 Diagnostic Test Program Execution Check
The Display Test program is stored on the T4900CT Diagnostic Disk. This program checks
the display controller on the system board. After loading Toshiba MS-DOS, run the Diagnos-
tic Program. Refer to Chapter 3, Tests and Diagnostics, for details.
Procedure 4 Connector Check
The Display unit has an LCD module, FL unit, Display switch, and FL inverter board. The FL
unit and FL inverter board are connected by one cable. The FL inverter board and upper
system board are connected by one cable. The LCD module and system board are connected
by one signal cable as shown below. Any of these cables may be disconnected.
Disassemble the display unit and check the following cable connections. Refer to chapter 4,
Replacement Procedures, for more information about how to disassemble the computer.
Figure 2-3 T4900CT Display connection
If any of these cables is not connected, firmly reconnect it and repeat Procedures 1 and 2. If
the problem still exists, perform Procedure 5.
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