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Introduction

HP ProBook 450 G6 CPU frequently overheats prompting replacement of fan; Probook unprompted shuts down due to CPU overheating. Fan is loud/produces unwarranted grinding noise. Unremovable excessive dust build up around fan. Physical damage to fan blades. Probook displays "Fan Error" or "System Fan (90B)" warning on startup.

What you need

Step 1 Lower Case

HP ProBook 450 G6 Fan Replacement, Lower Case: step 1, image 1 of 1

Power off your laptop and disconnect the charger and any peripheries before beginning disassembly.
Loosen the five captive Phillips 8.2 mm screws securing the lower case.
Remove the two 5 mm Phillips screws securing the lower case.

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Step 2

Insert an opening pick into the seam between the lower case and chassis.
Slide the opening pick around the entire perimeter, while prying every couple of centimeters to release the retaining clips.
Remove the lower case.

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Step 3 Battery

HP ProBook 450 G6 Fan Replacement, Battery: step 3, image 1 of 1

Remove the three Phillips M2.0x4.0 screws that are securing the battery.

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Step 4

HP ProBook 450 G6 Fan Replacement: step 4, image 3 of 3

Rotate the top of the battery up and lift the battery out of the Probook.

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Step 5 Fan

HP ProBook 450 G6 Fan Replacement, Fan: step 5, image 1 of 3

HP ProBook 450 G6 Fan Replacement, Fan: step 5, image 2 of 3

HP ProBook 450 G6 Fan Replacement, Fan: step 5, image 3 of 3

Disconnect the fan connector from the system board. Remove any tape securing the cable as needed.

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Step 6

HP ProBook 450 G6 Fan Replacement: step 6, image 3 of 3

Remove the Phillips M2.0x4.0 screw securing the fan to the Probook.
Slide the fan to the left out from under the heat sink and remove the fan from the Probook.

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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.

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