2 Troubleshooting Procedures
2.8 Display Troubleshooting
2-44
[CONFIDENTIAL]
libretto U100 Maintenance Manual (960-520)
Procedure 4
Replacement Check
The FL, BL board, LCD module, and System board are connected to display circuits. Any of
these components may be damaged. Refer to Chapter 4,
Replacement Procedures,
for
instructions on how to disassemble the computer and then perform the following checks:
If the FL does not light, perform Check 1.
If characters or graphics are not displayed clearly, perform Check 4.
If some screen functions do not operate properly, perform Check 4.
If the FL remains lit when the display is closed, perform Check 5.
Check 1
Replace the FL with a new one following the instructions in Chapter 4,
Replacement Procedures
and test the display again. If the problem still exists,
perform Check2.
Check 2
The LCD/BL cable or HV cable may be defective or damaged. Replace the
FL/LCD or HV cable with a new one following the instructions in Chapter 4,
Replacement Procedure
and test the display again. If the problem still exists,
perform Check3.
Check 3
The BL board may be defective or damaged. Replace the BL board with a new
one following the instructions in Chapter 4,
Replacement Procedure
and test the
display again. If the problem still exists, perform Check4.
Check 4
The LCD module may be defective or damaged. Replace the LCD module with a
new one following the instructions in Chapter 4,
Replacement Procedure
and test
the display again. If the problem still exists, perform Check 5.
Check 5
The System board may be defective or damaged. Replace it with a new one
following the instructions in Chapter 4,
Replacement Procedure
.
Summary of Contents for libretto U100 Series
Page 10: ...x CONFIDENTIAL libretto U100 Maintenance Manual 960 520 ...
Page 11: ... CONFIDENTIAL Chapter 1 Hardware Overview ...
Page 12: ...1 Hardware Overview 1 ii CONFIDENTIAL libretto U100 Maintenance Manual 960 520 ...
Page 38: ...1 Hardware Overview 1 9 AC Adapter 1 24 CONFIDENTIAL libretto U100 Maintenance Manual 960 520 ...
Page 39: ... CONFIDENTIAL Chapter 2 Troubleshooting Procedures ...
Page 40: ...2 Troubleshooting Procedures 2 ii CONFIDENTIAL libretto U100 Maintenance Manual 960 520 ...
Page 44: ...2 Troubleshooting Procedures 2 vi CONFIDENTIAL libretto U100 Maintenance Manual 960 520 ...
Page 113: ... CONFIDENTIAL Chapter 3 Tests and Diagnostics ...
Page 114: ...3 Tests and Diagnostics 3 ii CONFIDENTIAL libretto U100 Maintenance Manual 960 520 3 ...
Page 221: ...Chapter 4 Replacement Procedures CONFIDENTIAL ...
Page 222: ...4 Replacement Procedures 4 ii CONFIDENTIAL libretto U100 Maintenance Manual 960 520 ...
Page 226: ...4 Replacement Procedures 4 vi CONFIDENTIAL libretto U100 Maintenance Manual 960 520 ...
Page 295: ... CONFIDENTIAL Appendices ...
Page 296: ...Appendices App ii CONFIDENTIAL libretto U100 Maintenance Manual 960 520 ...
Page 304: ...Appendices App x CONFIDENTIAL libretto U100 Maintenance Manual 960 520 ...
Page 324: ...Appendices Appendix B Board Layout B 14 CONFIDENTIAL libretto U100 Maintenance Manual 960 520 ...
Page 366: ...Appendices Appendix E Key Layout E 2 CONFIDENTIAL libretto U100 Maintenance Manual 960 520 ...
Page 374: ...Appendices Appendix I Reliability I 2 CONFIDENTIAL libretto U100 Maintenance Manual 960 520 ...