Service manual

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Troubleshooting
4 – 4
pre-POST
PRE-POST ASSISTANT
This section describes possible problems before the Power-On-Self-Test (POST) and ways to solve them.
TABLE 4 – 1
PRE-POST PROBLEMS
Possible Problems Possible Causes
AC power LED fails The AC/DC adapter has malfunctioned.
AC power & charge LEDs fail
1. The power board has failed.
2. The battery pack has malfunctioned or its
connection to the power board is bad.
3. There is a short circuit in the system board.
LCD screen fails to display
1. There is a bad connection between the LCD screen
and the system board.
2. The inverter board has failed.
3. The LCD screen has malfunctioned.