HP EliteBook 755 Maintenance and Service Guide - Page 74

System board, SIM card blank only models without WWAN

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System board NOTE: All system board spare part kits include replacement thermal material. All system boards use the following part numbers: xxxxxx-001: Non-Windows operating systems xxxxxx-601: Windows operating system Description System board with AMD Ryzen 7 PRO 2700U processor System board with AMD Ryzen 5 PRO 2500U processor System board with AMD Ryzen 3 PRO 2300U processor Spare part number L21938-xx1 L21937-xx1 L21936-xx1 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, 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 bottom cover (see Bottom cover on page 34). 5. Remove the battery (see Battery on page 47). 6. Remove the keyboard (see Keyboard on page 43). 7. Remove the RJ-45 board and bracket (see RJ-45 board with bracket on page 53). 8. Remove the fan (see Fan on page 62). When replacing the system board, be sure to remove the following components (as applicable) from the defective system board and install on the replacement system board: ● SIM card blank (only models without WWAN) IMPORTANT: After removing the system board, remove the SIM card blank from the old system board and insert into the new system board. ● Solid-state drive (see Solid-state drive (SSD) on page 36) ● Memory modules (see Memory modules on page 37) ● WLAN/Bluetooth module (see WLAN/Bluetooth combo card on page 39) ● WWAN module (see WWAN module on page 41) ● Heat sink (see Heat sink assembly on page 49) Remove the system board: 1. Position the computer upright and open as far as possible. 64 Chapter 6 Removal and replacement procedures for Authorized Service Provider parts

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System board
NOTE:
All system board spare part kits include replacement thermal material.
All system boards use the following part numbers:
xxxxxx-001: Non-Windows operating systems
xxxxxx-601: Windows operating system
Description
Spare part number
System board with AMD Ryzen 7 PRO 2700U processor
L21938-xx1
System board with AMD Ryzen 5 PRO 2500U processor
L21937-xx1
System board with AMD Ryzen 3 PRO 2300U processor
L21936-xx1
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, 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 bottom cover (see
Bottom cover
on page
34
).
5.
Remove the battery (see
Battery
on page
47
).
6.
Remove the keyboard (see
Keyboard
on page
43
).
7.
Remove the RJ-45 board and bracket (see
RJ-45 board with bracket
on page
53
).
8.
Remove the fan (see
Fan
on page
62
).
When replacing the system board, be sure to remove the following components (as applicable) from the
defective system board and install on the replacement system board:
●
SIM card blank (only models without WWAN)
IMPORTANT:
After removing the system board, remove the SIM card blank from the old system board
and insert into the new system board.
●
Solid-state drive (see
Solid-state drive (SSD)
on page
36
)
●
Memory modules (see
Memory modules
on page
37
)
●
WLAN/Bluetooth module (see
WLAN/Bluetooth combo card
on page
39
)
●
WWAN module (see
WWAN module
on page
41
)
●
Heat sink (see
Heat sink assembly
on page
49
)
Remove the system board:
1.
Position the computer upright and open as far as possible.
64
Chapter 6
Removal and replacement procedures for Authorized Service Provider parts