Acer TRAVELMATE 7730, Service Manual, Page: 163 / 254

Chapter 4: Troubleshooting
153
Undetermined problems
If the diagnostic test may not identify which adapter or device failed, which installed devices are
incorrect, whether a short circuit is suspected, or whether the system is inoperative. Use these
procedures to isolate the failing FRU (do not isolate a non-defective FRU).
Note: Verify that all attached devices are supported by the notebook.
Note: Verify that the power supply being used at the time of the failure is
operating correctly. ( See “Testing the power system” on page 138. ):
To isolate a failing FRU:
1
Turn off the notebook.
2
Visually check FRU parts for damage. If you identify any damage, 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(s)
❑
SO-DIMM
❑
Optical drive
❑
PC Cards and Type 54 ExpressCards
4
Turn on the notebook.
5
Determine if the problem has changed.
❑
If the problem does not recur, reconnect the removed devices one at a time
until you find the failing FRU.
❑
If the problem does recur, replace the following FRUs one at a time:
❑
System board
❑
LCD assembly
Important: Do not replace a non-defective FRU.