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RTC battery
NOTE: Removing the RTC battery and leaving it uninstalled for 5 or more minutes causes all passwords
and CMOS settings to be cleared.
Description Spare part number
RTC battery 449137-001
Before removing the RTC battery, follow these steps:
1.
Shut down the computer. If you are unsure whether the computer is off or in Hibernation, turn the
computer on, and then shut it down through the operating system.
2.
Disconnect all external devices 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 29).
5.
Remove the following components:
a.
Keyboard (see
Keyboard on page 30)
b.
Hard drive or solid-state drive (see
Mass storage device on page 33)
c.
Top cover (see
Top cover on page 35)
d.
Audio board (see
Audio board on page 37)
e.
System board (see
System board on page 41)
Remove the RTC battery:
1.
Turn the system board upside down, with the front toward you.
2. Disconnect the RTC battery cable (1) from the system board.
Component replacement procedures 47