Texas Instruments Extensa 660 Series Maintenance Manual page 64

Faulty LCD - Replace the cover-display assembly as described in Section 6 of
this manual.
Low battery - Use a fully charged battery and/or plug in the AC adapter.
Table 5-1 contains fault isolation information for Display Problems on the notebook.
Symptoms are listed along the left side of the chart and the various Display FRUs are
listed along the top of the chart. Within the body of the table are the probabilities of
each of the FRUs causing that particular problem. For example, a single display line
on the screen is most likely caused by the LCD Panel or Display Cable; other
components have a low probability of causing the problem.
Problem Description
Single line on LCD display (horizontal
or vertical)
Multiple lines on display (horizontal or
vertical)
Sections of the display are missing
characters
Scrambled Display
Intermittent characters on display
Bright display, no visible characters
Brightness level fluctuating or display
blinking on/off
Display goes dim over time
Dim display but characters very
visible
Very dark display and characters are
slightly visible when a light is directed
at surface of the display
Very dark display and no characters
are visible
5-4 Troubleshooting Procedures
Table 5-1 Display Troubleshooting Guide
Inverter
Board
Low
Low
Low
Low
Low
Low
High
High
Medium
High
Low
LCD Display
Panel Cable
High Medium
Medium Medium
Medium Medium
Medium Low
Medium Medium
Medium Medium
Low Medium
Medium Low
Medium Low
Low Low
High High
Mother BIOS
Board
Low Low
Low Low
Low Low
Medium Medium
Medium Low
Medium Low
Low Low
Low Low
Low Low
Low Low
Medium Low