Lenovo Thinkbook Series Hardware Maintenance Manual page 47

Figure 23. Disconnect the battery pack cable
Step 2. Remove four screws and remove the heat sink.
Figure 24. Remove four screws and remove the heat sink
Screw specifications
M2 x 3 mm
Note: Remove six screws to remove the heat sink in the DIS model.
Go to
https://support.lenovo.com/partslookup
replacement part:
Heat sink
Number of screws
4
to look up the Lenovo part numbers of the following
.
Chapter 4 Removing a FRU or CRU
41