Maintenance and Service Guide

System board
NOTE: All system board spare part kits include replacement thermal material.
All system boards use the following part numbers:
xxxxxx-001: Non-Windows operating systems
xxxxxx-601: Windows operating system
Table 5-15 System board description and part number
Description Spare part number
System board for use in models with discrete graphics memory:
● Intel Core i7-8565U processor and 4 GB Radeon 535 graphics memory L50975-xx1
● Intel Core i5-8265U processor and 2 GB Radeon 535 graphics memory L50974-xx1
System board for use in models with UMA graphics memory:
● Intel Core i7-8565U processor L50973-xx1
● Intel Core i5-8265U processor L50972-xx1
● Intel Core i3-8145U processor L50971-xx1
Thermal pad, for use in models with discrete graphics memory L21302-001
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).
3. Remove the battery (see Battery on page 32).
4. Remove the WLAN module (see WLAN module on page 33).
5. Remove the solid-state drive (see Solid-state drive on page 39).
6. Remove the USB board (see USB board on page 54).
Remove the system board:
1. Disconnect the following cables from the system board:
(1) Power connector cable
(2) Speaker cable
(3) WLAN module antennas
(4) Display cable (ZIF)
(5) Webcam (CCD) cable (ZIF)
(6) Power button/audio board cable (ZIF)
(7) TouchPad cable from TouchPad (ZIF)
(8) Keyboard cable (ZIF)
(9) Backlight cable (ZIF)
56 Chapter 5 Removal and replacement procedures for authorized service provider parts