Introduction
This guide is used for the replacement of the fan assembly in the Lenovo Thinkpad T450s. Ample lighting and storage for small parts recommended.
Tools
Parts
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            Flip the laptop over so that the bottom is facing up. 
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            Unlock the battery by sliding the keys outwards. When unlocked, push the battery forwards to remove. 
 
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            Unscrew all 3.7 mm Phillips #0 screws from the back of the laptop. Half of them will remain attached to the cover. 
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            Lift off the back cover. 
 
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            Use a plastic opening tool or a nylon spudger to push the fan's bundled cable connector free. 
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            Remove the fan and heat sink assembly from the motherboard. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.