Lenovo ideapad FLEX 4 Hardware Maintenance page 52

ideapad FLEX 4-1470/ideapad FLEX 4-1435/ideapad FLEX 4-1480/ideapad
FLEX 4-1570/ideapad FLEX 4-1580 Hardware Maintenance Manual
Figure 7. Removal steps of fan assembly and Heat Sink assembly (continued)
When installing: Before you attach the fan assembly to the computer, apply
thermal grease, at an amount of 0.2 grams, to the part shown in the figure
above. Either too much or too little grease application can cause a thermal
problem due to imperfect contact with a component.
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