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Introduction

As your Dell Latitude 7400 is used, components and parts such as the screen can degrade in performance. Things such as white spots, colorful lines crossing your screen, and even your whole screen not working can indicate damage or malfunction that warrant repair and replacement.

As such, this guide serves as a multi-step process to removing and ultimately repairing or replacing your display assembly as a whole; the guide covers two other part removal guides including battery replacement and wireless card replacement that are necessary prerequisite steps in order to than remove the screen assembly.

What you need

Step 1 Battery

Dell Latitude 7400 Display Assembly Replacement, Battery: step 1, image 1 of 3

Dell Latitude 7400 Display Assembly Replacement, Battery: step 1, image 2 of 3

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

Dell Latitude 7400 Display Assembly 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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Step 6 Display Assembly

Dell Latitude 7400 Display Assembly Replacement, Display Assembly: step 6, image 1 of 3

Dell Latitude 7400 Display Assembly Replacement, Display Assembly: step 6, image 2 of 3

Dell Latitude 7400 Display Assembly Replacement, Display Assembly: step 6, image 3 of 3

Use a Phillips #0 screwdriver to loosen the 3 mm screw securing the display connector bracket.
Remove the bracket.
Use tweezers to lift the connector pull tab and disconnect the display connector.

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Step 7

Use a Phillips #0 screwdriver to loosen the six 3 mm captive screws securing the two hinges to the motherboard.

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Step 8

Carefully open the computer screen from the body, holding the hinges in place to secure them while tilting.
With the keyboard facing toward you, pull the bottom computer case from the screen hinges to remove it entirely.

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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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