Acer 7730A manual Undetermined problems, 153, To isolate a failing FRU

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:

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: ❑ 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

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 non-defective FRU.

Chapter 4: Troubleshooting 153