Remove The Heat Sink (For Uma Models) - Lenovo V17 Gen 3 Hardware Maintenance Manual

Figure 19. Disconnect the battery pack cable
Step 2. Loosen six screws and then remove the heat sink.
Figure 20. Loosen six screws and remove the heat sink
Go to
https://support.lenovo.com/partslookup
replacement part:
Heat sink

Remove the heat sink (for UMA models)

Make sure the following FRUs (or CRUs) have been removed.
"Remove the lower case" on page 28
Step 1. Disconnect the battery pack cable from the system board.
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Lenovo V17 Gen 3 Hardware Maintenance Manual
to look up the Lenovo part numbers of the following