Chapter 4
141
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.
Undetermined Problems
The diagnostic problems does not identify which adapter or device failed, which installed devices are incorrect,
whether a short circuit is suspected, or whether the system is inoperative.
Follow these procedures to isolate the failing FRU (do not isolate non-defective FRU).
NOTE:
Verify that all attached devices are supported by the computer.
NOTE:
Verify that the power supply being used at the time of the failure is operating correctly. (See “Power On
Issue” on page 124.):
1.
Power-off the computer.
2.
Visually check them for damage. If any problems are found, replace the FRU.
3.
Remove or disconnect all of the following devices:
•
Non-Acer devices
•
Printer, mouse, and other external devices
•
Battery pack
•
Hard disk drive
•
DIMM
•
CD-ROM/Diskette drive Module
•
PC Cards
4.
Power-on the computer.
5.
Determine if the problem has changed.
6.
If the problem does not recur, reconnect the removed devices one at a time until you find the failing FRU.
7.
If the problem remains, replace the following FRU one at a time. Do not replace a non-defective FRU:
•
System board
•
LCD assembly
Summary of Contents for TravelMate 4730 Series
Page 6: ...VI ...
Page 10: ...X Table of Contents ...
Page 14: ...4 Chapter 1 System Block Diagram ...
Page 34: ...24 Chapter 1 ...
Page 52: ...42 Chapter 2 ...
Page 60: ...50 Chapter 3 7 Remove the WLAN cover as shown ...
Page 95: ...Chapter 3 85 7 Lift the Thermal Module clear of the Mainboard ...
Page 114: ...104 Chapter 3 3 Connect the RJ 11 cable to the modem module as shown ...
Page 118: ...108 Chapter 3 2 Replace the two securing screws ...
Page 122: ...112 Chapter 3 2 Connect the seven cables on the mainboard as shown B C D E F G A ...
Page 128: ...118 Chapter 3 3 Turn the computer over and replace the five securing screws ...
Page 175: ...Chapter 6 165 ...
Page 184: ...Appendix A 174 ...
Page 188: ...178 Appendix B ...
Page 190: ...180 Appendix C ...
Page 193: ...183 Wireless Function Failure 136 WLAN Board 52 ...
Page 194: ...184 ...