Table 5-13 System board descriptions and part numbers (continued)
Description Spare part number
● AMD Ryzen R7 7840HS processor with NVIDIA GeForce RTX 4050 graphics N55735-xx1
● AMD Ryzen R5 PRO 7640HS processor with NVIDIA RTX A1000 graphics N55725-xx1
● AMD Ryzen R5 7640HS processor with NVIDIA RTX A1000 graphics N55718-xx1
● AMD Ryzen R5 7640HS processor with NVIDIA GeForce RTX 4050 graphics N55734-xx1
Models with UMA graphics memory:
● AMD Ryzen R9 PRO 7940HS processor N55724-xx1
● AMD Ryzen R9 7940HS processor N55723-xx1
● AMD Ryzen R7 PRO 7840HS processor N55722-xx1
● AMD Ryzen R7 7840HS processor N55721-xx1
● AMD Ryzen R5 PRO 7640HS processor N55720-xx1
● AMD Ryzen R5 7640HS processor N55719-xx1
Before removing the system board, follow these steps:
1. Prepare the computer for disassembly (see Preparation for disassembly on page 37).
2. Remove the bottom cover (see Bottom cover on page 37).
3. Remove the battery (see Battery on page 39).
4. Remove the battery support bracket (see Card reader board on page 46).
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 40).
● Solid-state drive (see Solid-state drive on page 42).
● WLAN module (see WLAN module on page 43).
● Heat sink (see Heat sink on page 58).
NOTE: You do not have to remove the heat sink before removing the system board.
Remove the system board:
1. Disconnect the following cables from the system board:
● Speaker cable (1)
● Sensor board cable (ZIF) (2)
● Display cable (3)
● Card reader board cable (ZIF) (4)
● Touchpad cable (ZIF) (5)
System board
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