Lenovo IdeaPad P580/P585/N580/N581/N585/N586 Hardware Maintenance Manual
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When installing: Before you attach the fan assembly to the computer, apply
thermal grease, at an amount of 0.2 grams, to the 
parts shown in the figure above. Either too much or too less grease application can cause a thermal problem due to imperfect contact with a component.
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