Undetermined Problems
The diagnostic tests did not identify which adapter or
device failed, which installed devices are incorrect, whether
a short circuit is suspected, or whether the system is inop-
erative. Follow the procedures below to isolate the failing
FRU.
Verify that the power supply being used at the time of the
failure is operating correctly.
1. Power off the computer.
2. Check the cables, wires, and connectors for short cir-
cuits and open circuits. Visually check them for
damage. If any problems are found, replace the FRU.
3. Remove or disconnect all of the following devices:
Non-IBM devices
Printer, external mouse & keyboard, and other
external devices
Battery pack
Hard disk drive
CD-ROM drive/Diskette drive (optional)
PC Card (PCMCIA)
4. Power on the computer.
5. Determine if the problem has changed.
6. If the problem does not occur again, reconnect the
removed devices one at a time until you find the
failing FRU.
7. If the problem remains, replace the following FRUs
one at a time. Do not replace a non-defective FRU.
Hard disk drive connection board
LCD assembly
System board
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ThinkPad i Series 1200/1300 HMM