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Introduction

A replacement for the Dell Latitude 7400's wireless card may be necessary if the device is unable to connect to a wireless network, or to a Bluetooth device.
The wireless card is located inside of the Dell Latitude 7400 and provides the ability to connect to wireless networks, as well as other wireless devices. Like many computer parts, the wireless card can experience a failure in its function over time due to physical/ mechanical failures, damage to the unit itself, or the inability to maintain a good connection.

This section details the process to replace the wireless card of the the Dell Latitude 7400. Care should be used when replacing the wireless card, as it will require you to manipulate both small wires and screws. Following these steps will help restore proper wireless functionality to the device.

What you need

Step 1 Battery

Dell Latitude 7400 Wireless Card Replacement, Battery: step 1, image 1 of 3

Dell Latitude 7400 Wireless Card Replacement, Battery: step 1, image 2 of 3

Dell Latitude 7400 Wireless Card Replacement, Battery: step 1, image 3 of 3

Lay the laptop on a flat hard surface facing downward.
Use a Phillips #0 screwdriver to remove the eight 3 mm screws that secure the lower case.
Lift the lower case off and set that aside.

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Step 2

Dell Latitude 7400 Wireless Card Replacement: step 2, image 3 of 3

Use a Phillips #0 screwdriver to loosen the two 3 mm captive screws that secure the battery.
The screws will not remove completely, so just loosen them enough to lift battery.
Gently grip the battery connector loop and lift it to disconnect the battery connector.
Lift the battery up and out.

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Step 3 Wireless Card

Dell Latitude 7400 Wireless Card Replacement, Wireless Card: step 3, image 1 of 2

Dell Latitude 7400 Wireless Card Replacement, Wireless Card: step 3, image 2 of 2

Use a Phillips #0 screwdriver to remove the single screw (M2 × 3 mm) securing the wireless card.
Remove the wireless card bracket.

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Step 4

Use tweezers or the point of a spudger to lift and disconnect the black and white antenna cables from their sockets on the wireless card.

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Step 5

Holding both sides of the card, carefully slide it out of the slot at an angle.
If the card feels stuck, gently increase pressure to loosen it from the foam. Do not force it.

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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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