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115
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
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 100.)
Important
Do not replace a non-defective FRU.