Acer TravelMate 520 TravelMate 520 Service Guide - Page 85

Undetermined Problems The diagnostic problems does not identify which adapter or device failed, which installed devices are incorrect, whether a short circuit is suspected, or whether the system is inoperative. Follow these procedures to isolate the failing FRU (do not isolate non-defective FRU). NOTE: Verify that all attached devices are supported by the computer. NOTE: Verify that the power supply being used at the time of the failure is operating correctly. 1. Power-off the computer. 2. Visually check them for damage. If any problems are found, replace the FRU. 3. Remove or disconnect all of the following devices: 6 Non-Acer devices 6 Devices attached to the port replicator 6 Printer, mouse, and other external devices 6 Battery pack 6 Hard disk drive 6 DIMM 6 CD-ROM 6 Diskette drive 6 PC Cards 4. Power-on the computer. 5. Determine if the problem has changed. 6. If the problem does not recur, reconnect the removed devices one at a time until you find the failing FRU. 7. If the problem remains, replace the following FRU one at a time. Do not replace a non-defective FRU: 6 System board 6 LCD assembly Chapter 4 79