Maintenance and Service Guide

System board
NOTE: All system board spare part kits include a processor and replacement thermal material.
Table 5-16 System board descriptions and part numbers
Description Spare part number
System board for use in models with discrete graphics equipped with the following processors:
Intel Core i7-8565U processor and 4 GB of GeForce MX250 discrete graphics memory L51994-xx1
Intel Core i7-8565U processor and 2 GB of GeForce MX130 discrete graphics memory L51993-xx1
Intel Core i5-8265U processor and 2 GB of GeForce MX130 discrete graphics memory L51992-xx1
Intel Core i5-8265U processor and 2 GB of GeForce GTX1050 discrete graphics memory L51991-xx1
Intel Core i3-7020U processor and 2 GB of GeForce MX110 discrete graphics memory L51990-xx1
System board for use in models with UMA graphics equipped with the following processors:
Intel Core i7-8565U processor L51987-xx1
Intel Core i5-8265U processor L51986-xx1
Intel Core i3-8145U processor L51985-xx1
Intel Core i3-7020U processor L51984-xx1
Intel Pentium N5000 processor L51988-xx1
Intel Celeron N4000 processor L51989-xx1
Before removing the system board, follow these steps:
1. Prepare the computer for disassembly (Preparation for disassembly on page 29).
2. Remove the bottom cover (see Bottom cover on page 30), and then remove the following components:
a. Battery (see Battery on page 32)
b. Fan (see Fan on page 46)
When replacing 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:
● WLAN module (see WLAN module on page 35)
● Memory modules (see Memory module on page 39)
● Solid-state drive (see Solid-state drive on page 37) or Optane memory module (Optane memory module
on page 38)
● Optane memory module (see Optane memory module on page 38)
Remove the system board:
1. Disconnect the following cables:
(1) Hard drive board cable
(2) Fingerprint reader cable
(3) Power connector (DC-in) board cable
Component replacement procedures 51