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Dell Latitude 3400 Service Manual - Page 44

Steps, Open the latch and disconnect the WWAN daughterboard cable from the WWAN daughterboard.

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Steps 1. Open the latch and disconnect the WWAN daughterboard cable from the WWAN daughterboard. 44 Removing and installing components

Section	Page
Dell Latitude 3400 Service Manual	3
Working on your computer	5
Safety instructions	5
Turning off your computer — Windows 10	5
Before working inside your computer	6
After working inside your computer	6
Technology and components	7
DDR4	7
USB features	8
USB Type-C	10
Intel Optane memory	10
Enabling Intel Optane memory	11
Disabling Intel Optane memory	11
Intel UHD Graphics 620	11
Nvidia GeForce MX130 equivalent	12
Major components of your system	13
Removing and installing components	15
Recommended tools	15
Secure Digital Card	15
Removing the Secure Digital card	15
Installing the Secure Digital card	16
Base cover	17
Removing the base cover	17
Installing the base cover	20
Battery	22
Lithium-ion battery precautions	22
Removing the battery	23
Installing the battery	24
Hard drive	26
Removing the hard drive assembly	26
Installing the hard drive assembly	27
IO board	29
Removing the IO board	29
Installing the IO board	30
Touchpad	32
Removing the touchpad assembly	32
Installing the touch pad assembly	34
Memory modules	36
Removing the memory module	36
Installing the memory module	36
SIM Card	37
Removing the SIM card	37
Installing the SIM card	38
WLAN card	39
Removing the WLAN card	39
Installing the WLAN card	40
WWAN card	41
Removing the WWAN card	41
Installing the WWAN card	42
WWAN daughterboard	43
Removing the WWAN daughterboard	43
Installing the WWAN daughterboard	45
Solid-state drive/Intel Optane memory module	47
Removing the M.2 2280 Solid-state drive or Intel Optane memory—Optional	47
Installing the M.2 2280 Solid-state drive or Intel Optane memory - Optional	49
Removing the M.2 Solid-state drive bracket	51
Installing the Solid-state drive bracket	52
Removing the M.2 2230 Solid-state drive	53
Installing the M.2 2230 Solid-state drive	55
Speakers	57
Removing the speakers	57
Installing the speakers	59
System fan	61
Removing the system fan	61
Installing the system fan	63
Heat sink	65
Removing the heatsink—UMA	65
Installing the heatsink—UMA	66
Removing the heatsink—discrete	67
Installing the heatsink—discrete	68
VGA daughterboard	69
Removing the VGA daughterboard	69
Installing the VGA daughterboard	71
Power-button board	72
Removing the power button board with optional fingerprint reader	72
Installing the power button board with optional fingerprint reader	74
System board	75
Removing the system board	75
Installing the system board	78
Display assembly	81
Removing the display assembly	81
Installing the display assembly	85
Display bezel	89
Removing the display bezel	89
Installing the display bezel	91
Display panel	93
Removing the display panel	93
Installing the display panel	96
Display cable	99
Removing the display cable	99
Installing the display cable	101
Power-adapter port	103
Removing the power adapter port	103
Installing the power adapter port	104
Camera	105
Removing the camera	105
Installing the camera	107
Palmrest	109
Removing the palmrest and keyboard assembly	109
Troubleshooting	111
Enhanced Pre-Boot System Assessment — ePSA diagnostics	111
Running the ePSA Diagnostics	111
Diagnostics	112
M-BIST	112
L-BIST	112
Diagnostic LED	113
Battery status LED	113
Getting help	115

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Steps

Open the latch and disconnect the WWAN daughterboard cable from the WWAN daughterboard.

Removing and installing components