System board
NOTE: All system boards use the following part numbers:
xxxxxx-001: Non-Windows operating systems
xxxxxx-601: Windows 10 operating system
Description Spare part number
System board with integrated processor for use in models with discrete graphics memory:
●
Intel Core i7-8850H processor L31553-001, -601
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Intel Core i7-8750H processor L31552-001, -601
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Intel Core i5-8400H processor L31551-001, -601
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Intel Core i5-8300H processor L31550-001, -601
System board with integrated processor for use in models with UMA graphics memory:
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Intel Core i7-8850H processor L31557-001, -601
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Intel Core i7-8750H processor L31556-001, -601
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Intel Core i5-8400H processor L31555-001, -601
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Intel Core i5-8300H processor L31554-001, -601
Before removing the system board, follow these steps:
1. Turn o the computer. If you are unsure whether the computer is o or in Hibernation, turn the
computer on, and then shut it down through the operating system.
2. Disconnect the power from the computer by unplugging the power cord from the computer.
3. Disconnect all external devices from the computer.
4. Remove the bottom cover (see Bottom cover on page 29).
5. Remove the battery (see Battery on page 31).
NOTE: When replacing the system board, be sure that the following components are removed from the
defective system board and installed on the replacement system board (as applicable):
●
Solid-state drive (see Solid-state drive (M.2) on page 33
●
Memory module (see Memory module on page 35)
Remove the system board:
1. Remove the three Phillips M2.0×4.0 screws (1) from the USB Type-C/power connector bracket, and then
lift the bracket o the system board (2).
Component replacement procedures 49
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