IBM ThinkPad X21 2660, Hardware Maintenance Manual

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Verify that the power supply being used at the time of the
failure is operating correctly. (See “Power system
checkout” on page 29)
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. CD-ROM and diskette drive in the UltraBase X2
i. PC Cards
4. Power on the computer.
5. Determine whether 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 FRUs
one at a time (do not replace a non-defective FRU):
a. System board
b. LCD assembly
ThinkPad X21
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