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Introduction

Many issues with displays, such as black screens, are software based and can be resolved by changing configurations or settings. However, if the issues are not resolved, or the display is physically damaged, it might need to be replaced.

This tutorial will guide you through replacing the display of a Dell Latitude 7420.

Before starting, please ensure the device is turned off and disconnected from any adaptors or charging cables.

Likewise, use an anti-static band or mat when opening computers or handling components.

What you need

Step 1 Back Case

Dell Latitude 7420 Display Replacement, Back Case: step 1, image 1 of 3

Dell Latitude 7420 Display Replacement, Back Case: step 1, image 2 of 3

Dell Latitude 7420 Display Replacement, Back Case: step 1, image 3 of 3

Remove the eight, 7 mm screws from the back case using a Phillips #0 screwdriver.
Use an opening pick or opening tool and work your way around the periphery of the base cover to separate it from the chassis.

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Step 2 Display

Dell Latitude 7420 Display Replacement, Display: step 2, image 1 of 3

Dell Latitude 7420 Display Replacement, Display: step 2, image 2 of 3

Dell Latitude 7420 Display Replacement, Display: step 2, image 3 of 3

Use a Phillips #00 screwdriver to remove the three, 2 mm screws fastening the cable covers.
Remove both cable covers.

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Step 3

Tool used on this step:

Tweezers

$4.99

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Slide a thin, ESD-safe pry tool or tweezers under the wire until it's snug against the connector, and pry straight up from the board to detach the coaxial cables from the Wi-Fi card.
Disconnect the remaining cables connecting the display assembly to the board.

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Step 4

Dell Latitude 7420 Display Replacement: step 4, image 3 of 3

Use a Phillips #00 screwdriver to remove the four 4 mm screws securing the display hinges.
There are two screws to remove from each hinge.
Lift the base to pull the display assembly free.