Packard Bell EasyNote DT85, Service Manual

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157
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).
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
–
Memory cards
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
Verify that all attached devices are supported by the notebook.
Important
Verify that the power supply being used at the time of the failure is
operating correctly. (
See “Testing the power system” on page 140. )
Important
Do not replace a non-defective FRU.