Table 5-11 System board descriptions and part numbers
Description Spare part
number
System board (includes replacement thermal material and the Windows 10 operating system):
Equipped with an AMD Ryzen7 5700U processor and a graphics subsystem with UMA memory M45488-601
Equipped with an AMD Ryzen5 5500U processor and a graphics subsystem with UMA memory M45487-601
Before removing the system board, follow these steps:
1. Prepare the computer for disassembly (see Preparation for disassembly on page 29).
2. Remove the bottom cover (see Bottom cover on page 29).
3. Disconnect the battery cable from the system board (see Battery on page 31).
4. Remove the solid-state drive (see Solid-state drive on page 33).
5. Remove the processor fan (see Processor fan on page 40).
6. Remove the graphics fan (see Graphics fan on page 41).
7. Remove the heat sink (see Heat sink on page 42).
When replacing the system board, be sure to remove the memory modules (see Memory module on page 35)
from the defective system board and install them on the replacement system board.
Remove the system board:
1. Remove the shield (1) that secures the wireless antenna cables to the WLAN module.
2. Carefully disconnect the wireless antenna cables (2) from the WLAN module.
NOTE: Computer models have either one or two WLAN antennas. On models with two antennas, the #1
white WLAN antenna cable connects to the WLAN module #1 Main terminal. The #2 black WLAN antenna
cable connects to the WLAN module #1 Aux terminal.
3. Release the ZIF connector (3) to which the webcam/microphone module cable is connected, and then
disconnect the webcam/microphone module cable from the system board.
4. Disconnect the display panel cable (4) from the system board.
5. Release the ZIF connector (5) to which the sensor board cable is connected, and then disconnect the sensor
board cable from the system board.
6. Disconnect the speaker cable (6) from the system board.
7. Release the ZIF connector (7) to which the backlight cable is connected, and then disconnect the backlight
cable from the system board.
8. Release the ZIF connector (8) to which the keyboard cable is connected, and then disconnect the keyboard
cable from the system board.
9. Release the ZIF connector (9) to which the touchpad cable is connected, and then disconnect the touchpad
cable from the system board.
44
Chapter 5 Removal and replacement procedures for authorized service provider parts
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