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System board
Description Spare part number
System board:
●
E350 system board with WWAN 635314-001
●
E350 system board 639297-001
Before removing the system board, follow these steps:
1. Shut down the computer. If you are unsure whether the computer is off or in Hibernation mode,
turn on the computer, and then shut it down using the operating system.
2. Disconnect all of the external devices that are connected to the computer.
3. Disconnect the power from the computer by first unplugging the power cord from the AC outlet
and then unplugging the AC adapter from the computer.
4. Remove the battery (see
Battery on page 32).
5. Remove the following components:
a. Service cover (see
Hard drive on page 33).
b. Hard drive (see
Hard drive on page 33).
c. Keyboard (see
Keyboard on page 43).
d. Top cover (see
Top cover on page 45).
e. Display assembly (see
Display assembly on page 51).
When replacing the system board, be sure that the following components are removed from the
defective system board and installed on the replacement system board:
●
RTC battery (see
RTC battery on page 57).
●
Heat sink (see
Heat sink assembly on page 58).
Remove the system board:
To remove the system board, follow these steps:
1. Disconnect the fan cable (1) from the system board.
ENWW Component replacement procedures 55