Remove The Heat Sink - Lenovo ThinkBook 13s Gen 4 Hardware Maintenance Manual

Figure 15. Remove the touchpad
Go to
https://support.lenovo.com/partslookup
part:
Touchpad

Remove the heat sink

Make sure the following FRU (or CRU) has been removed.
"Remove the lower case" on page 28
Step 1. Disconnect the battery pack cable from the system board.
Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.
Step 2. Peel off the tape.
Figure 16. Peel off the tape
Step 3. Remove three screws and then remove the heat sink.
to look up the Lenovo part number of the following replacement
.
Chapter 4 Removing a FRU or CRU
35