146
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 136):
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
p
ack
•
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 NV42 Series
Page 6: ...VI ...
Page 10: ...X Table of Contents ...
Page 34: ...24 Chapter 1 ...
Page 51: ...Chapter 2 41 ...
Page 52: ...42 Chapter 2 ...
Page 76: ...66 Chapter 3 7 Lift the Upper Cover clear of the computer as shown ...
Page 78: ...68 Chapter 3 ...
Page 80: ...70 Chapter 3 7 Lift the Speaker Modules clear of the Upper Cover ...
Page 85: ...Chapter 3 75 5 Disconnect the Bluetooth cable from the module ...
Page 87: ...Chapter 3 77 4 Turn the USB Board over and disconnect the USB cable from the board ...
Page 98: ...88 Chapter 3 4 Remove the LCD Panel rear edge first Place it on a clean surface ...
Page 144: ...134 Chapter 3 ...
Page 175: ...Chapter 6 165 ...
Page 178: ...Appendix A 168 ...
Page 196: ...186 Appendix C ...
Page 200: ...190 ...