Acer TravelMate 4720 Series, Руководство по обслуживанию

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Chapter 4 109
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.
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. (See “Power
System Check” on page 95.)
Follow procedures below to isolate the failing FRU. Do not isolate non-defective FRU.
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:
K
Non-Acer devices
K Printer, mouse, and other external devices
K Battery pack
K Hard disc drive
K
DIMM
K
CD/DVD-ROM drive
K PC cards
4. Power on the computer.
5. Determine if the problem has been resolved.
6. If the problem does not recur, reconnect the removed devices one at a time until you find the failed FRU.
7. If the problem persists, replace the following FRU one at a time. Do not replace a non-defective FRU.
K System board
K LCD assembly
SG_TM4720_4320_Book.book Page 109 Friday, April 20, 2007 11:14 AM