기기를 수리하세요 커뮤니티 상점

Dell Latitude 7420 Keyboard Replacement/Teardown

소개

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.

필요한 것

  1. Dell Latitude 7420 Keyboard Replacement/Teardown, Remove backplate: 1 단계, 이미지 1/2 Dell Latitude 7420 Keyboard Replacement/Teardown, Remove backplate: 1 단계, 이미지 2/2

    • remove 8x screws with PH1 Screwdriver

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

    편집

  2. Dell Latitude 7420 Keyboard Replacement/Teardown, Disconnect battery: 2 단계, 이미지 1/3 Dell Latitude 7420 Keyboard Replacement/Teardown, Disconnect battery: 2 단계, 이미지 2/3 Dell Latitude 7420 Keyboard Replacement/Teardown, Disconnect battery: 2 단계, 이미지 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!

    편집

  3. Dell Latitude 7420 Keyboard Replacement/Teardown, Disconnect speaker cable: 3 단계, 이미지 1/2 Dell Latitude 7420 Keyboard Replacement/Teardown, Disconnect speaker cable: 3 단계, 이미지 2/2

    • remove speaker cable by pulling towards yourself horizontally

    • lift out the battery vertically.

    편집

  4. Dell Latitude 7420 Keyboard Replacement/Teardown, disconnect ribbon cables: 4 단계, 이미지 1/3 Dell Latitude 7420 Keyboard Replacement/Teardown, disconnect ribbon cables: 4 단계, 이미지 2/3 Dell Latitude 7420 Keyboard Replacement/Teardown, disconnect ribbon cables: 4 단계, 이미지 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

    편집

  5. Dell Latitude 7420 Keyboard Replacement/Teardown, disconnect headphone jack daughter board: 5 단계, 이미지 1/1

    • Insert wisdom here.

    편집

  6. Dell Latitude 7420 Keyboard Replacement/Teardown, disconnect fan: 6 단계, 이미지 1/1

    • pull horizontally to the rigt

    편집

  7. Dell Latitude 7420 Keyboard Replacement/Teardown, unscrew connector plates: 7 단계, 이미지 1/3 Dell Latitude 7420 Keyboard Replacement/Teardown, unscrew connector plates: 7 단계, 이미지 2/3 Dell Latitude 7420 Keyboard Replacement/Teardown, unscrew connector plates: 7 단계, 이미지 3/3

    • Use JIS00 or J00

    • display connector

    • wifi antenna connector

    편집

  8. Dell Latitude 7420 Keyboard Replacement/Teardown, unscrew connector plates: 8 단계, 이미지 1/2 Dell Latitude 7420 Keyboard Replacement/Teardown, unscrew connector plates: 8 단계, 이미지 2/2

    • use JIS00 or J00

    • unscrew connector plate

    편집

  10. Dell Latitude 7420 Keyboard Replacement/Teardown, disconnect cables: 9 단계, 이미지 1/3 Dell Latitude 7420 Keyboard Replacement/Teardown, disconnect cables: 9 단계, 이미지 2/3 Dell Latitude 7420 Keyboard Replacement/Teardown, disconnect cables: 9 단계, 이미지 3/3

    • lift upwards vertically

    • pull out horizontally away from you

    편집

  11. Dell Latitude 7420 Keyboard Replacement/Teardown, remove heat sink: 10 단계, 이미지 1/3 Dell Latitude 7420 Keyboard Replacement/Teardown, remove heat sink: 10 단계, 이미지 2/3 Dell Latitude 7420 Keyboard Replacement/Teardown, remove heat sink: 10 단계, 이미지 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

    편집

  12. Dell Latitude 7420 Keyboard Replacement/Teardown, remove motherboard screws: 11 단계, 이미지 1/1

    • use PH1 for 2x mobo screws

    편집

  13. Dell Latitude 7420 Keyboard Replacement/Teardown, remove USB C screws: 12 단계, 이미지 1/3 Dell Latitude 7420 Keyboard Replacement/Teardown, remove USB C screws: 12 단계, 이미지 2/3 Dell Latitude 7420 Keyboard Replacement/Teardown, remove USB C screws: 12 단계, 이미지 3/3

    • remove 4x USB Screws with PH1

    • these are longer, do not mix them up!

    편집

  14. Dell Latitude 7420 Keyboard Replacement/Teardown, USB C daughter board screws: 13 단계, 이미지 1/2 Dell Latitude 7420 Keyboard Replacement/Teardown, USB C daughter board screws: 13 단계, 이미지 2/2

    • remove 2x with PH1

    편집

  15. Dell Latitude 7420 Keyboard Replacement/Teardown, remove motherboard: 14 단계, 이미지 1/3 Dell Latitude 7420 Keyboard Replacement/Teardown, remove motherboard: 14 단계, 이미지 2/3 Dell Latitude 7420 Keyboard Replacement/Teardown, remove motherboard: 14 단계, 이미지 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

    편집

  16. Dell Latitude 7420 Keyboard Replacement/Teardown, remove headphone jack daughter board: 15 단계, 이미지 1/1

    • remove 1x screw with PH1

    • lift out daughter board vertically

    편집

  17. Dell Latitude 7420 Keyboard Replacement/Teardown, unstick ribbon cables: 16 단계, 이미지 1/2 Dell Latitude 7420 Keyboard Replacement/Teardown, unstick ribbon cables: 16 단계, 이미지 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

    편집

  18. Dell Latitude 7420 Keyboard Replacement/Teardown, disconnect keyboard ribbon cables: 17 단계, 이미지 1/3 Dell Latitude 7420 Keyboard Replacement/Teardown, disconnect keyboard ribbon cables: 17 단계, 이미지 2/3 Dell Latitude 7420 Keyboard Replacement/Teardown, disconnect keyboard ribbon cables: 17 단계, 이미지 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

    편집

  19. Dell Latitude 7420 Keyboard Replacement/Teardown, remove keyboard backplate screws: 18 단계, 이미지 1/3 Dell Latitude 7420 Keyboard Replacement/Teardown, remove keyboard backplate screws: 18 단계, 이미지 2/3 Dell Latitude 7420 Keyboard Replacement/Teardown, remove keyboard backplate screws: 18 단계, 이미지 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

    편집

  20. Dell Latitude 7420 Keyboard Replacement/Teardown, remove keyboard with backplate: 19 단계, 이미지 1/2 Dell Latitude 7420 Keyboard Replacement/Teardown, remove keyboard with backplate: 19 단계, 이미지 2/2

    • lift up keyboard vertically

    • be careful: ribbon cables might be sticky

    편집

  21. Dell Latitude 7420 Keyboard Replacement/Teardown, removing keyboard from backplate: 20 단계, 이미지 1/3 Dell Latitude 7420 Keyboard Replacement/Teardown, removing keyboard from backplate: 20 단계, 이미지 2/3 Dell Latitude 7420 Keyboard Replacement/Teardown, removing keyboard from backplate: 20 단계, 이미지 3/3

    • use PH1 to unscrew backplate from front of keyboard

    편집

  22. Dell Latitude 7420 Keyboard Replacement/Teardown, clean CPU and Heat Sink: 21 단계, 이미지 1/2 Dell Latitude 7420 Keyboard Replacement/Teardown, clean CPU and Heat Sink: 21 단계, 이미지 2/2

    • remove old thermal paste using isopropyl alcohol and a cloth

    • apply new thermal paste

    편집

  23. Dell Latitude 7420 Keyboard Replacement/Teardown, backplate: 22 단계, 이미지 1/1

    • keyboard backplate

    편집

    • 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

    편집
결론

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

다른 3명이 해당 안내서를 완성하였습니다.

작성자

다른 기여자 2명과 함께

fixer

회원 가입일: 07/05/16

862 평판

안내서 3개 작성하였습니다

배지: 9

배지 +6개 더

댓글 2개

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

Alex - 답글

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 - 답글

댓글 쓰기

조회 통계:

24 시간 전: 12

7일 전: 55

30일 전: 211

전체 시간: 4,116