162
Chapter 4
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 146.):
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 Aspire 4935 Series
Page 6: ...VI ...
Page 10: ...X Table of Contents ...
Page 60: ...50 Chapter 2 ...
Page 68: ...58 Chapter 3 7 Carefully open the HDD Cover ...
Page 95: ...Chapter 3 85 5 Remove the TouchPad Bracket from the Upper Base ...
Page 100: ...90 Chapter 3 5 Lift the USB Board clear of the casing ...
Page 104: ...94 Chapter 3 7 Lift the mainboard right side first to remove from the base ...
Page 112: ...102 Chapter 3 4 Lift the bezel away from the panel ...
Page 115: ...Chapter 3 105 4 Lift the LCD Panel out of the casing as shown ...
Page 122: ...112 Chapter 3 13 Ensure that the securing pin is properly located ...
Page 130: ...120 Chapter 3 7 Insert the cable through the casing to the top side as shown ...
Page 143: ...Chapter 3 133 13 Replace the two securing screws ...
Page 148: ...138 Chapter 3 4 Turn the computer over and replace the six securing screws as shown ...
Page 154: ...144 Chapter 3 ...
Page 193: ...Chapter 6 183 ...
Page 232: ...Appendix A 222 ...
Page 240: ...230 Appendix C ...