Lenovo IdeaPad C340-14IWL Hardware Maintenance Manual page 48

Figure 27. Detach the connectors
Step 2. Remove the screws that secure the thermal module to the system board and upper case.
Figure 28. Remove the 8 screws (for UMA)
Figure 29. Remove the 10 screws (for DIS)
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Chapter 4 Removing a FRU or CRU