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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
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.)
To isolate a failing FRU:
1Turn off the notebook.
2Visually check FRU parts for damage. If you identify any damage, replace the FRU.
3Remove or disconnect all of the following devices:
–
–Printer, mouse, and other external devices
–Battery pack
–Hard disk drive(s)
–SO-DIMM
–Optical drive
–Memory cards
4Turn on the notebook.
5Determine 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
