Keyboard/Touchpad-Related Symptoms
Symptom / Error | Action in Sequence |
Keyboard (one or more keys) does not work. | Reconnect the keyboard cable. |
| Keyboard |
| System board |
|
|
Touchpad does not work. | Reconnect touchpad cable. |
| Touchpad board |
| System board |
|
|
Modem-Related Symptoms
Symptom / Error | Action in Sequence |
Internal modem does not work correctly. | Modem phone port |
| modem combo board |
| System board |
|
|
NOTE: If you cannot find a symptom or an error in this list and the problem remains, see “Undetermined Problems” on page 88.
Intermittent Problems
Intermittent system hang problems can be caused by a variety of reasons that have nothing to do with a hardware defect, such as: cosmic radiation, electrostatic discharge, or software errors. FRU replacement should be considered only when a recurring problem exists.
When analyzing an intermittent problem, do the following:
1.Run the advanced diagnostic test for the system board in loop mode at least 10 times.
2.If no error is detected, do not replace any FRU.
3.If any error is detected, replace the FRU. Rerun the test to verify that there are no more errors.
Chapter 4 | 87 |
