System board
To remove the system board, use these procedures and illustrations.
Table 6-12 System board descriptions and part numbers
Description Spare part
number
System board (includes processor):
All system boards use the following part numbers:
xxxxxx-001: Non-Windows operating system
xxxxxx-601: Windows 10 operating system
AMD Ryzen 7 PRO 4750U M22244-xx1
AMD Ryzen 5 PRO 4650U M22243-xx1
AMD Ryzen 3 PRO 4450U M22242-xx1
Before removing the system board, follow these steps:
1. Prepare the computer for disassembly (Preparation for disassembly on page 33).
2. Remove the bottom cover (Bottom cover on page 33).
3. Remove the battery (see Battery on page 43).
4. Remove the fan (see Fan on page 53).
When you replace the system board, be sure to remove the following components (as applicable) from the
defective system board and install them on the replacement system board:
● Memory modules (see Memory modules on page 34).
● WLAN module (see WLAN module on page 37).
● WWAN module (see WWAN module on page 38).
● Solid-state drive (see Solid-state drive on page 40).
● Heat sink (see Heat sink on page 54).
Remove the system board:
1. Disconnect the following cables from the system board:
● Power connector cable (1)
● Camera cable (2)
● Antenna cables from the WWAN module (select products only) (3)
● Small USB cable from the USB board (4)
● Larger USB cable from the USB board (ZIF) (5)
● Speaker cable (6)
● Display cable (7)
● Keyboard cable (ZIF) (8)
56 Chapter 6 Removal and replacement procedures for authorized service provider parts
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