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Introduction

The HP Probook 640 G4 is a business class 14 inch laptop that is designed for durability. This guide will walk you through how to safely replace the fan. A failing fan can cause loud grinding noises, overheating, or messages like "Fan Error".

Before you start be sure to power the laptop off completely, unplug the AC adapter, and remove all external devices. Work on a clean flat surface. Make sure you have all of the right tools and parts available.

If the fan is not spinning, is noisy, or your Probook overheats often a replacement fan will often fix it. After replacement, run HP hardware diagnostics and a stress test to confirm normal temperatures and that the new fan is running smoothly.

What you need

Step 1 Lower Case

HP ProBook 640 G4 Fan and Heat Sink Replacement, Lower Case: step 1, image 1 of 2

HP ProBook 640 G4 Fan and Heat Sink Replacement, Lower Case: step 1, image 2 of 2

Loosen the eight 2.5 mm-long Phillips captive screws securing the lower case.
Captive screws cannot be fully removed.

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Step 2

Insert an opening pick into the seam between the lower case and chassis, and twist it to create a gap.
Insert an opening tool into the gap.
Use the opening tool to pry around the entire perimeter of the device until the lower case fully releases.
Remove the lower case.

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Step 3 Battery

HP ProBook 640 G4 Fan and Heat Sink Replacement, Battery: step 3, image 1 of 3

HP ProBook 640 G4 Fan and Heat Sink Replacement, Battery: step 3, image 2 of 3

HP ProBook 640 G4 Fan and Heat Sink Replacement, Battery: step 3, image 3 of 3

Use a Phillips screwdriver to loosen the six 2.5 mm-long captive screws securing the battery.
Captive screws are not fully removable—they only loosen.
Slide and lift the battery out.

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Step 4 Fan and Heat Sink

HP ProBook 640 G4 Fan and Heat Sink Replacement, Fan and Heat Sink: step 4, image 1 of 1

Loosen the four 2.5 mm-long Phillips screws securing the heat sink.
Loosen the four 2.5 mm-long Phillips screws securing the fan.

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Step 5

Lift the heat sink out.

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Step 6

HP ProBook 640 G4 Fan and Heat Sink Replacement: step 6, image 3 of 3

Push the fan connector directly out of it socket.
Remove the fan.

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Conclusion

To reassemble your device, follow the above steps in reverse order.
Take your e-waste to an R2 or e-Stewards certified recycler.
Repair didn’t go as planned? Try some basic troubleshooting or ask our Answers community for help.