Lenovo ThinkPad Edge E431 Hardware Maintenance Manual - Page 50

Turn on the computer., Optical disk or diskette in the internal drive

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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. Devices attached to the dock c. Printer, mouse, and other external devices d. Battery pack e. Hard disk drive or solid-state drive f. External diskette drive or optical drive g. Memory module h. Optical disk or diskette in the internal drive i. PC 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 Hardware Maintenance Manual

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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. Devices attached to the dock
c.
Printer, mouse, and other external devices
d. Battery pack
e.
Hard disk drive or solid-state drive
f.
External diskette drive or optical drive
g. Memory module
h.
Optical disk or diskette in the internal drive
i.
PC 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
Hardware Maintenance Manual