Procedure 1 External Display Check; Procedure 2 Diagnostic Check - Compal ACY25 series Service Manual

This section describes how to determine if the computer's display is functioning properly.
The process is outlined in Figure 6-3. Start with Procedure 1 and continue with the other
procedures as instructed.
Procedure 1:
Procedure 2:
Procedure 3:
Procedure 1 External display check
Connect an external display to the computer's external monitor port, then boot the computer.
The computer automatically detects the external display. Press Fn+F5 to switch to the
external display.
If the external display works correctly, the internal LCD may be damaged. Go to Procedure 3.
If the external monitor appears to have the same problem as the internal monitor, the system
board may be damaged. Go to Procedure 2.
Procedure 2 Diagnostic check
The Display Test program is stored on the computer's 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 3. If an error is not detected, the display is
functioning properly.
Procedure 3 Connector and replacement check
The FL inverter board, LCD module, and system board are connected to the display circuits.
Any of these components may be damaged. Replacement Procedures, for instructions on
how to disassemble the computer and then perform the following checks:
Check 1 Make sure the DDRRAM module is seated properly. Test display again. If the
problem still exits, replace the DDRRAM module. If the problem still exists,
perform check 2.
Check 2 Replace the FL inverter board with a new one and test display again. If the
problem still exists, perform Check 3.
Check 3 Replace the LCD module with a new one and test display again. If the problem
still exists, perform Check 4.
Check 4 Replace the LCD/FL cable with a new one and test display again. If the problem
still exists, perform Check 5.
Check 5 Replace the CPU with another of the same specifications. If the problem still
exists, perform Check 6.
Check 6 The system board may be damaged. Replace it with a new one.
Chapter
6-10
External display check
Diagnostic check
Connector and replacement check