2.
For 4540s models, disconnect the following cables from the system board:
(1)
Speaker cable
(2)
Function board/Power button board cable
(3)
Fingerprint reader board cable
3.
For 4440s/4441 models, disconnect the following cables from the system board:
(1)
Function board/Power button board cable
(2)
Finger print reader board cable
4.
Position the computer upside down.
Component replacement procedures
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