Service Guide
5-3
Table 5-1
Display Troubleshooting Guide
Problem Description
Inverter
Board
LCD
Panel
Display
Cable
Mother
Board
BIOS
Single line on LCD display (horizontal or
vertical)
Low
High
Medium
Low
Low
Multiple lines on display (horizontal or vertical)
Low
Medium
Medium
Low
Low
Sections of the display are missing characters
Low
Medium
Medium
Low
Low
Scrambled Display
Low
Medium
Low
Medium
Medium
Intermittent characters on display
Low
Medium
Medium
Medium
Low
Bright display, no visible characters
Low
Medium
Medium
Medium
Low
Brightness level fluctuating or display blinking
on/off
High
Low
Medium
Low
Low
Display goes dim over time
High
Medium
Low
Low
Low
Dim display but characters very visible
Medium
Medium
Low
Low
Low
Very dark display and characters are slightly
visible when a light is directed at surface of the
display
High
Low
Low
Low
Low
Very dark display and no characters are visible
Low
High
High
Medium
Low
5.3.3 Fault Isolation Using Self Test
When the computer is first powered up, it automatically performs a self test of its central hardware
and memory functions. During self test (which lasts for a few seconds), the display shows copyright
and version number information.
Note:
Some procedures in this paragraph require you to use keystroke sequences, such as Ctrl-
Alt-Del. To execute a keystroke sequence such as this, you must press all three keys
simultaneously.
5.3.3.1 Self Test Error Messages
Upon successful completion of the self test, the computer automatically loads its operating system
and other built-in utilities. If the self test fails to complete successfully, the display shows one of the
error messages described in Table 5-2.
Note:
In the event of a hardware problem that affects the display, the Notebook also
communicates errors via a series of beeps. The interpretation of the beep codes is
provided in Table 5-3.
Table 5-2
Self Test Error Messages
Error Message
Explanation
Diskette drive 0 failure
This message indicates the internal floppy disk (drive A) has failed (or is not
installed on the computer). Press Ctrl-Alt-Esc to ensure that drive type is correctly
set (3.5 inch, 1.44 MB) in BIOS Setup.
Run the Diagnostics to check Drive A as described in Paragraph 5.4. Also try using
a new, correctly formatted disk.
Содержание Extensa 670
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