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Dell Latitude 7420 Keyboard Replacement/Teardown

简介

This guide will show you how to replace the keyboard. Because the keyboard can only be replaced from the insde this is close to a teardown.

Don't be scared, its mostly unscrewing stuff. Work methodically and lay down screws in the order you used them.

If you have questions: hit me up.

你所需要的

  1. Dell Latitude 7420 Keyboard Replacement/Teardown, Remove backplate: 步骤 1 中的图像 1，2 Dell Latitude 7420 Keyboard Replacement/Teardown, Remove backplate: 步骤 1 中的图像 2，2

    • remove 8x screws with PH1 Screwdriver

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

    编辑

  2. Dell Latitude 7420 Keyboard Replacement/Teardown, Disconnect battery: 步骤 2 中的图像 1，3 Dell Latitude 7420 Keyboard Replacement/Teardown, Disconnect battery: 步骤 2 中的图像 2，3 Dell Latitude 7420 Keyboard Replacement/Teardown, Disconnect battery: 步骤 2 中的图像 3，3

    • 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!

    编辑

  3. Dell Latitude 7420 Keyboard Replacement/Teardown, Disconnect speaker cable: 步骤 3 中的图像 1，2 Dell Latitude 7420 Keyboard Replacement/Teardown, Disconnect speaker cable: 步骤 3 中的图像 2，2

    • remove speaker cable by pulling towards yourself horizontally

    • lift out the battery vertically.

    编辑

  4. Dell Latitude 7420 Keyboard Replacement/Teardown, disconnect ribbon cables: 步骤 4 中的图像 1，3 Dell Latitude 7420 Keyboard Replacement/Teardown, disconnect ribbon cables: 步骤 4 中的图像 2，3 Dell Latitude 7420 Keyboard Replacement/Teardown, disconnect ribbon cables: 步骤 4 中的图像 3，3

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

    • carefully lift up ribbon cables and pull towards yourself

    编辑

  5. Dell Latitude 7420 Keyboard Replacement/Teardown, disconnect headphone jack daughter board: 步骤 5 中的图像 1，1

    • Insert wisdom here.

    编辑

  6. Dell Latitude 7420 Keyboard Replacement/Teardown, disconnect fan: 步骤 6 中的图像 1，1

    • pull horizontally to the rigt

    编辑

  7. Dell Latitude 7420 Keyboard Replacement/Teardown, unscrew connector plates: 步骤 7 中的图像 1，3 Dell Latitude 7420 Keyboard Replacement/Teardown, unscrew connector plates: 步骤 7 中的图像 2，3 Dell Latitude 7420 Keyboard Replacement/Teardown, unscrew connector plates: 步骤 7 中的图像 3，3

    • Use JIS00 or J00

    • display connector

    • wifi antenna connector

    编辑

  8. Dell Latitude 7420 Keyboard Replacement/Teardown, unscrew connector plates: 步骤 8 中的图像 1，2 Dell Latitude 7420 Keyboard Replacement/Teardown, unscrew connector plates: 步骤 8 中的图像 2，2

    • use JIS00 or J00

    • unscrew connector plate

    编辑

  10. Dell Latitude 7420 Keyboard Replacement/Teardown, disconnect cables: 步骤 9 中的图像 1，3 Dell Latitude 7420 Keyboard Replacement/Teardown, disconnect cables: 步骤 9 中的图像 2，3 Dell Latitude 7420 Keyboard Replacement/Teardown, disconnect cables: 步骤 9 中的图像 3，3

    • lift upwards vertically

    • pull out horizontally away from you

    编辑

  11. Dell Latitude 7420 Keyboard Replacement/Teardown, remove heat sink: 步骤 10 中的图像 1，3 Dell Latitude 7420 Keyboard Replacement/Teardown, remove heat sink: 步骤 10 中的图像 2，3 Dell Latitude 7420 Keyboard Replacement/Teardown, remove heat sink: 步骤 10 中的图像 3，3

    • 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

    编辑

  12. Dell Latitude 7420 Keyboard Replacement/Teardown, remove motherboard screws: 步骤 11 中的图像 1，1

    • use PH1 for 2x mobo screws

    编辑

  13. Dell Latitude 7420 Keyboard Replacement/Teardown, remove USB C screws: 步骤 12 中的图像 1，3 Dell Latitude 7420 Keyboard Replacement/Teardown, remove USB C screws: 步骤 12 中的图像 2，3 Dell Latitude 7420 Keyboard Replacement/Teardown, remove USB C screws: 步骤 12 中的图像 3，3

    • remove 4x USB Screws with PH1

    • these are longer, do not mix them up!

    编辑

  14. Dell Latitude 7420 Keyboard Replacement/Teardown, USB C daughter board screws: 步骤 13 中的图像 1，2 Dell Latitude 7420 Keyboard Replacement/Teardown, USB C daughter board screws: 步骤 13 中的图像 2，2

    • remove 2x with PH1

    编辑

  15. Dell Latitude 7420 Keyboard Replacement/Teardown, remove motherboard: 步骤 14 中的图像 1，3 Dell Latitude 7420 Keyboard Replacement/Teardown, remove motherboard: 步骤 14 中的图像 2，3 Dell Latitude 7420 Keyboard Replacement/Teardown, remove motherboard: 步骤 14 中的图像 3，3

    • 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

    编辑

  16. Dell Latitude 7420 Keyboard Replacement/Teardown, remove headphone jack daughter board: 步骤 15 中的图像 1，1

    • remove 1x screw with PH1

    • lift out daughter board vertically

    编辑

  17. Dell Latitude 7420 Keyboard Replacement/Teardown, unstick ribbon cables: 步骤 16 中的图像 1，2 Dell Latitude 7420 Keyboard Replacement/Teardown, unstick ribbon cables: 步骤 16 中的图像 2，2

    • 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

    编辑

  18. Dell Latitude 7420 Keyboard Replacement/Teardown, disconnect keyboard ribbon cables: 步骤 17 中的图像 1，3 Dell Latitude 7420 Keyboard Replacement/Teardown, disconnect keyboard ribbon cables: 步骤 17 中的图像 2，3 Dell Latitude 7420 Keyboard Replacement/Teardown, disconnect keyboard ribbon cables: 步骤 17 中的图像 3，3

    • 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

    编辑

  19. Dell Latitude 7420 Keyboard Replacement/Teardown, remove keyboard backplate screws: 步骤 18 中的图像 1，3 Dell Latitude 7420 Keyboard Replacement/Teardown, remove keyboard backplate screws: 步骤 18 中的图像 2，3 Dell Latitude 7420 Keyboard Replacement/Teardown, remove keyboard backplate screws: 步骤 18 中的图像 3，3

    • 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

    编辑

  20. Dell Latitude 7420 Keyboard Replacement/Teardown, remove keyboard with backplate: 步骤 19 中的图像 1，2 Dell Latitude 7420 Keyboard Replacement/Teardown, remove keyboard with backplate: 步骤 19 中的图像 2，2

    • lift up keyboard vertically

    • be careful: ribbon cables might be sticky

    编辑

  21. Dell Latitude 7420 Keyboard Replacement/Teardown, removing keyboard from backplate: 步骤 20 中的图像 1，3 Dell Latitude 7420 Keyboard Replacement/Teardown, removing keyboard from backplate: 步骤 20 中的图像 2，3 Dell Latitude 7420 Keyboard Replacement/Teardown, removing keyboard from backplate: 步骤 20 中的图像 3，3

    • use PH1 to unscrew backplate from front of keyboard

    编辑

  22. Dell Latitude 7420 Keyboard Replacement/Teardown, clean CPU and Heat Sink: 步骤 21 中的图像 1，2 Dell Latitude 7420 Keyboard Replacement/Teardown, clean CPU and Heat Sink: 步骤 21 中的图像 2，2

    • remove old thermal paste using isopropyl alcohol and a cloth

    • apply new thermal paste

    编辑

  23. Dell Latitude 7420 Keyboard Replacement/Teardown, backplate: 步骤 22 中的图像 1，1

    • keyboard backplate

    编辑

    • 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

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结论

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

3等其他人完成本指南。

作者

与2其他贡献者

fixer

于07/05/16注册

862 声望

创作了3篇指南

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2条评论

Steps 10 and 13 are not necessary (motherboard could be removed together with a head sink)

Alex - 回复

After following this very useful guide my new keyboard was not working, when you reconnect all the ribbon cable take some time to reconnect them better then I have done :-D

If something is not working double check the ribbon cables connection before doing anything else.

daniele - 回复

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