Remove The System Board And Heat Sink (For Real Fan Models) - Lenovo 14e Chromebook Gen 3 Hardware Maintenance Manual

Figure 23. Loosen four screws and remove the heat sink
Go to
https://support.lenovo.com/partslookup
replacement parts:
System board
Heat sink

Remove the system board and heat sink (for real fan models)

Make sure the following FRUs (or CRUs) have been removed.
"Remove the lower case" on page 30
"Remove the Wi-Fi card" on page 32
"Remove the right I/O board bracket" on page 33
Step 1. Disconnect the fan cable, 14-pin I/O board cable, 40-pin I/O board cable, keyboard backlight cable
(if any), keyboard cable, touchpad cable, speaker cable, and EDP cable from the system board.
Figure 24. Disconnect the cables from the system board
to look up the Lenovo part numbers of the following
.
Chapter 5 Removing a FRU or CRU
45