Dell Latitude 7420 Keyboard Replacement Teardown Repair Guide

Difficulty

Moderate

Steps

23

Time Required

                          45 minutes - 1 hour            

Sections

1

• Keyboard
• 23 steps

Flags

2

In Progress

This guide is a work in progress. Reload periodically to see the latest changes!

Member-Contributed Guide

An awesome member of our community made this guide. It is not managed by iFixit staff.

• BackDell Latitude 7420

• Full Screen

• Options

• History

• Save to Favorites

• Download PDF

• Edit

• Translate

• Get Shareable Link

• Embed This Guide

• Notify Me of Changes

• Stop Notifications

Introduction

If you have questions: hit me up.

What you need

Step 1

              Remove backplate               

• remove 8x screws with PH1 Screwdriver
• Use finger nail or operning pick between backplate and frame at the top of the device

remove 8x screws with PH1 Screwdriver

Use finger nail or operning pick between backplate and frame at the top of the device

1024

Step 2

              Disconnect battery               

• remove battery connector by pulling up. make sure the pulling strap is turned upwards
• remove 5x screws with PH1
• these are longer, do not mix them up!

remove battery connector by pulling up. make sure the pulling strap is turned upwards

remove 5x screws with PH1

these are longer, do not mix them up!

Step 3

              Disconnect speaker cable               

• remove speaker cable by pulling towards yourself horizontally
• lift out the battery vertically.

remove speaker cable by pulling towards yourself horizontally

lift out the battery vertically.

Step 4

              disconnect ribbon cables               

• open ribbon cable connectors by lifting up and away from you the black securing latch
• carefully lift up ribbon cables and pull towards yourself

open ribbon cable connectors by lifting up and away from you the black securing latch

carefully lift up ribbon cables and pull towards yourself

Step 5

              disconnect headphone jack daughter board               

• Insert wisdom here.

Insert wisdom here.

Step 6

              disconnect fan               

• pull horizontally to the rigt

pull horizontally to the rigt

Step 7

              unscrew connector plates               

• Use JIS00 or J00
• display connector
• wifi antenna connector

Use JIS00 or J00

display connector

wifi antenna connector

Step 8

              unscrew connector plates               

• use JIS00 or J00
• unscrew connector plate

use JIS00 or J00

unscrew connector plate

Step 9

              disconnect cables               

• lift upwards vertically
• pull out horizontally away from you

lift upwards vertically

pull out horizontally away from you

Step 10

              remove heat sink               

• remove 6x screws using PH1
• remove cable sticker from heat sink
• if the thermal paste has dried out the heat sink can be stuck on. carefully wiggle it horizontally until you can lift it up vertically

remove 6x screws using PH1

remove cable sticker from heat sink

if the thermal paste has dried out the heat sink can be stuck on. carefully wiggle it horizontally until you can lift it up vertically

Step 11

              remove motherboard screws               

• use PH1 for 2x mobo screws

use PH1 for 2x mobo screws

Step 12

              remove USB C screws               

• remove 4x USB Screws with PH1
• these are longer, do not mix them up!

remove 4x USB Screws with PH1

Step 13

              USB C daughter board screws               

• remove 2x with PH1

remove 2x with PH1

Step 14

              remove motherboard               

• start on the right side at the USB C daughter board.
• lift up the motherboard where the fan used to be
• you should be able disconnect the daughterboard and mother board
• the USB C port on the left might be tight. Use your fingers to slightly bend the laptop casing outward to the left above the usb c port
• lift out the motherboard vertically
• lift out USB C daughter board vertically. use the frame bending trick if necessary

start on the right side at the USB C daughter board.

lift up the motherboard where the fan used to be

you should be able disconnect the daughterboard and mother board

the USB C port on the left might be tight. Use your fingers to slightly bend the laptop casing outward to the left above the usb c port

lift out the motherboard vertically

lift out USB C daughter board vertically. use the frame bending trick if necessary

Step 15

              remove headphone jack daughter board               

• remove 1x screw with PH1
• lift out daughter board vertically

remove 1x screw with PH1

lift out daughter board vertically

Step 16

              unstick ribbon cables               

• carefully unstick glued on ribbon cables. use are card and pull up at 45° angle
• no need to remove headphone jack cable
• disconnect ribbon cable
• be extremly careful not to pull at bends in the ribbon cables

carefully unstick glued on ribbon cables. use are card and pull up at 45° angle

no need to remove headphone jack cable

disconnect ribbon cable

be extremly careful not to pull at bends in the ribbon cables

Step 17

              disconnect keyboard ribbon cables               

• open connector as usual
• the smaller ribbon cable has a different securing mechanism, look at the second image. it is opend from the other side
• open connector from smaller ribbon cable at the white flap. NOT on top of the ribbon cable!
• pull out ribbon cables

open connector as usual

the smaller ribbon cable has a different securing mechanism, look at the second image. it is opend from the other side

open connector from smaller ribbon cable at the white flap. NOT on top of the ribbon cable!

pull out ribbon cables

Step 18

              remove keyboard backplate screws               

• use JIS00 or J00 to remove 19x screws
• go around perimeter of the backplate in a orderly fashion when removing the screws to not miss any

use JIS00 or J00 to remove 19x screws

go around perimeter of the backplate in a orderly fashion when removing the screws to not miss any

Step 19

              remove keyboard with backplate               

• lift up keyboard vertically
• be careful: ribbon cables might be sticky

lift up keyboard vertically

be careful: ribbon cables might be sticky

Step 20

              removing keyboard from backplate               

• use PH1 to unscrew backplate from front of keyboard

use PH1 to unscrew backplate from front of keyboard

Step 21

              clean CPU and Heat Sink               

• remove old thermal paste using isopropyl alcohol and a cloth
• apply new thermal paste

remove old thermal paste using isopropyl alcohol and a cloth

apply new thermal paste

Step 22

              backplate               

• keyboard backplate

keyboard backplate

Step 23

              Tips               

• when you are done with reassembly do not panic, the first boot takes a little longer after disconnecting the battery
• after reassembly press inbetween keyboard keys to klick together backplate and notebook frame

when you are done with reassembly do not panic, the first boot takes a little longer after disconnecting the battery

after reassembly press inbetween keyboard keys to klick together backplate and notebook frame

To reassemble your device, follow these instructions in reverse order.

Cancel: I did not complete this guide.

Author

                    fixer                     

Member since: 07/05/2016

427 Reputation

                                      3 Guides authored                  



                       Badges:
                       9







                                                        +6 more badges