Toshiba T3400 Maintenance Manual page 42

Procedure 3 Connector Check
The Display unit has an LCD module, FL, panel close switch, and FL inverter board. The FL
and FL inverter board are connected by cable. The LCD module and system board are con-
nected by signal cabling as shown below. Any of these cables may be disconnected.
Disassemble the display unit and check the designated cable connections. Refer to Chapter 4,
Replacement Procedures, for more information about how to disassemble the computer.
FL
System board
Firmly re-attach any disconnected cables and repeat Procedures 1 and 2. If the problem still
exists, perform Procedure 4.
Procedure 4 Replacement Check
The FL, FL inverter board, LCD module, and system board are connected to the display
circuits. Any of these components may be damaged. Refer to Chapter 4, Replacement Proce-
dures, for disassembly instructions and then perform the following checks:
If the FL does not illuminate, perform Check 1.
If characters are not displayed clearly, perform Check 3.
If some screen functions do not operate properly, perform Check 3.
If the FL remains illuminated when the display is closed, perform Check 4.
Check 1 Replace the FL (T3400) or FL unit (T3400CT) and test the display. If the prob-
lem persists, perform Check 2.
Check 2 Replace the FL inverter board and test the display. If the problem persists, per-
form Check 3.
Check 3 Replace the LCD module and test the display. If the problem persists, perform
Check 4.
T3400/T3400CT Maintenance Manual
Display switch
LED Board
Figure 2-3 Display Connection
CN2
FL inverter board
CN1
LCD unit
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