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Introduction

This guide will walk you through the process of replacing the Wi-Fi card in the HP ProBook 640 G1 laptop. Sometimes the Wi-Fi may stop working even though everything else on the laptop works fine. Before replacing the Wi-Fi card, try simple fixes such as checking your network connection, turning airplane mode off, restarting the router, forgetting and reconnecting to the Wi-Fi, updating or reinstalling the Wi-Fi driver, or restarting the laptop. If the Wi-Fi still does not work after these steps, the Wi-Fi card may be faulty and replacing it can help fix the issue.

This repair requires removing battery, service cover and Wi-Fi card. Always make sure the laptop is fully powered off and not in sleep mode. Disconnect the charger and any external devices before starting.

What you need

Step 1 Battery

HP ProBook 640 Wi-Fi Card Replacement, Battery: step 1, image 1 of 1

Turn the laptop upside down to show the battery lock slider.
It is a black slider near the top, with a battery logo to the left and a lock sign to the right.

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Step 2

Slide the battery slider all the way to the left, towards the battery symbol.
You may also need to slide the other slider to the right of the battery slider, as shown in the picture.

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Step 3

Remove the battery by sliding it away from the laptop while holding the battery locker.
The battery should slide out with ease.

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Step 4 Back Panel

HP ProBook 640 Wi-Fi Card Replacement, Back Panel: step 4, image 1 of 2

HP ProBook 640 Wi-Fi Card Replacement, Back Panel: step 4, image 2 of 2

Slide down and pull up on the cover to remove it.

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Step 5 Midframe

HP ProBook 640 Wi-Fi Card Replacement, Midframe: step 5, image 1 of 3

HP ProBook 640 Wi-Fi Card Replacement, Midframe: step 5, image 2 of 3

HP ProBook 640 Wi-Fi Card Replacement, Midframe: step 5, image 3 of 3

Remove the eight rubber screw plugs from the bottom and the two rubber screw plugs from the sides of the laptop using a paperclip.
Remove the fourteen 6 mm screws from the bottom of the laptop and the two 6 mm screws from the sides using a T8 Torx screwdriver.
Remove the six 4 mm screws that secure the midframe using a T8 Torx screwdriver.
Some of the screws are held in place by springs and cannot be fully removed, but can still be loosened.

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Step 6

Remove the disk drive by gently pulling it out.
Remove the two 3 mm screws using a Phillips #1 screwdriver.
Only one screw is visible in the photo the second screw is located directly above it.

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Step 7

Gently pull up on the midframe, gripping it from the inside.
This may take a small amount of force. If it feels stuck, check for missed screws. Go back to the previous steps and make sure you have removed all necessary screws.

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Step 8 Wi-Fi Card

HP ProBook 640 Wi-Fi Card Replacement, Wi-Fi Card: step 8, image 1 of 3

HP ProBook 640 Wi-Fi Card Replacement, Wi-Fi Card: step 8, image 2 of 3

HP ProBook 640 Wi-Fi Card Replacement, Wi-Fi Card: step 8, image 3 of 3

Remove the three 2 mm screws securing the Wi-Fi card using a Phillips #1 screwdriver.
Lift the metal retaining bracket off of the card.

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Step 9

Gently pull the metal connectors to disconnect the two small antenna wires from the Wi-Fi card.
Gently slide the Wi-Fi card out of its slot at an upward angle, holding it by the edges.
Antenna cables are delicate. Pulling them sideways or with too much force can damage the connectors and reduce wireless performance.