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Verify that all attached devices are supported by the computer.
Verify that the power supply being used at the time of the failure is operating correctly. See "Power system
checkout" on page 29.
1. Turn 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-ThinkPad devices
b. Printer, mouse, and other external devices
c. batteries
d. Internal storage drive
e. External diskette drive or optical drive
f. Memory module
g. M.2 cards
4. Turn 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 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
44
A275 Hardware Maintenance Manual
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