Dell Latitude 5421 Service Manual page 4

LED board........................................................................................................................................................................... 40
Removing the LED board...........................................................................................................................................40
Installing the LED board..............................................................................................................................................41
Heat sink and fan assembly............................................................................................................................................ 42
Removing the heat sink and fan assembly - UMA configuration.....................................................................42
Installing the heat sink and fan assembly - UMA configuration....................................................................... 43
Removing the heat sink and fan assembly - Discrete configuration...............................................................44
Installing the heat sink and fan assembly - Discrete configuration.................................................................45
Speakers.............................................................................................................................................................................. 46
Removing the speakers..............................................................................................................................................46
Installing the speakers................................................................................................................................................ 47
USB type-C bracket......................................................................................................................................................... 48
Removing the USB type-C bracket........................................................................................................................ 48
Installing the USB type-C bracket...........................................................................................................................49
System board..................................................................................................................................................................... 50
Removing the system board.....................................................................................................................................50
Installing the system board....................................................................................................................................... 53
Power-button board......................................................................................................................................................... 56
Removing the power-button board........................................................................................................................ 56
Installing the power-button board...........................................................................................................................57
Smart card reader............................................................................................................................................................. 58
Removing the smart card reader.............................................................................................................................58
Installing the smart card reader............................................................................................................................... 60
Coin-cell battery.................................................................................................................................................................61
Removing the coin-cell battery.................................................................................................................................61
Installing the coin-cell battery.................................................................................................................................. 62
Keyboard assembly........................................................................................................................................................... 63
Removing the keyboard assembly........................................................................................................................... 63
Installing the keyboard assembly............................................................................................................................. 65
Keyboard bracket.............................................................................................................................................................. 66
Removing the keyboard bracket..............................................................................................................................66
Installing the keyboard bracket................................................................................................................................ 68
Display assembly................................................................................................................................................................69
Removing the display assembly............................................................................................................................... 69
Installing the display assembly...................................................................................................................................71
Display bezel....................................................................................................................................................................... 75
Removing the display bezel.......................................................................................................................................75
Installing the display bezel......................................................................................................................................... 76
Display panel....................................................................................................................................................................... 77
Removing the display panel....................................................................................................................................... 77
Installing the display panel.........................................................................................................................................80
Camera/microphone module.......................................................................................................................................... 85
Removing the camera................................................................................................................................................ 85
Installing the camera...................................................................................................................................................85
Removing the infrared camera.................................................................................................................................86
Installing the infrared camera................................................................................................................................... 87
eDP/display cable............................................................................................................................................................. 88
Removing the eDP cable........................................................................................................................................... 88
Installing the eDP cable..............................................................................................................................................89
Sensor board....................................................................................................................................................................... 91
4 Contents