IBM ThinkPad TransNote, Hardware Maintenance Manual

Page: 53 / 150

Undetermined problems
You are here because the diagnostic tests did not identify
which adapter or device failed, incorrect devices are
installed, a short circuit is suspected, or the system is
inoperative. Follow these procedures to isolate the failing
FRU.
Note: Do not replace any FRU if the procedures do not
identify it as defective.
Verify that all attached devices are supported by the
computer.
Check the power system; see “Power system checkout” on
page 28.
1. Power off the computer.
2. Visually check each FRU for damage. Replace any
damaged FRU.
3. Remove or disconnect all of the following devices:
a. Non-IBM devices
b. Devices attached to the port replicator
c. Printer, mouse, and other external devices
d. Battery pack
e. Hard-disk drive
f. External diskette drive
g. DIMM
h. CompactFlash card
i. PC Card
4. Power on the computer.
5. Determine whether the problem has been solved.
6. If the problem does not recur, reconnect the removed
devices one at a time, and test the system after each
reinstallation. Do this until you find the failing FRU.
7. If the problem remains, replace the following FRUs one
at a time (do not replace a nondefective FRU):
a. System board
b. LCD assembly
Symptom-to-FRU index
ThinkPad TransNote
49