Compal ACY25 series, Service Manual

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To determine if the computer’s keyboard is functioning properly, perform the following
procedures. Figure 6-5 outlines the process. Start with Procedure 1 and continue with the
other procedures as instructed.
Procedure 1: External keyboard check
Procedure 2: Diagnostic check
Procedure 3: Connector and replacement check
Procedure 1 External keyboard check
Connect a USB keyboard to one of the computer’s keyboard/mouse ports, then boot the
computer. The computer automatically detects the external keyboard.
If the external keyboard works correctly, the internal keyboard or its connections may be
faulty. Go to Procedure 2.
If the external keyboard appears to have the same problem as the internal keyboard, the
system board may be damaged.
Procedure 2 Diagnostic test
Run the Diagnostic Program, which will automatically execute the Keyboard Test. Refer to
Chapter 3,
Tests and Diagnostics for more information on how to run the program.
If an error is located, go to Procedure 3. If an error does not occur, the keyboard is
functioning properly.
Procedure 3 Connector and replacement check
The keyboard and/or system board may be disconnected or damaged. Replacement
Procedures and perform the following checks.
Check 1 Make sure the keyboard cable is firmly connected to the system board.
If the connection is loose, reconnect firmly and repeat Procedure 2. If there is still an error,
go to Check 2.
Check 2 The keyboard may be damaged.
If the problem still exists, perform Check 3.
Check 3 The system board may be damaged. R
Chapter
6-14