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Dell Inspiron 14 Plus 7420 Service Manual - Page 42

Installing the power button with optional fingerprint reader

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Steps 1. Peel off the Mylar that covers the fingerprint-reader cable. 2. Peel off the tape that secures the fingerprint-reader cable to the palm-rest and keyboard assembly. 3. Open the latch and disconnect the fingerprint-reader cable from the I/O board. Steps 1 to 3 are applicable to computers shipped with a fingerprint reader. 4. Remove the screw (M2x3) that secures the power button with optional fingerprint reader to the palm-rest and keyboard assembly. 5. Peel the tape that secures the fingerprint-reader cable to the palm-rest and keyboard assembly. 6. Lift the power button with optional fingerprint reader off the palm-rest and keyboard assembly. Installing the power button with optional fingerprint reader Prerequisites If you are replacing a component, remove the existing component before performing the installation process. About this task The following image(s) indicate the location of the power button with optional fingerprint reader and provides a visual representation of the installation procedure. 42 Removing and installing components

Section	Page
Inspiron 14 Plus 7420 Service Manual	1
Contents	3
Working inside your computer	5
Safety instructions	5
Before working inside your computer	5
Radiation Exposure Statement	6
Electrostatic discharge—ESD protection	6
ESD field service kit	7
Transporting sensitive components	8
After working inside your computer	8
Removing and installing components	9
Recommended tools	9
Major components of Inspiron 14 Plus 7420	9
Screw list	11
Base cover	12
Removing the base cover	12
Installing the base cover	14
Battery	15
Lithium-ion battery precautions	15
Removing the battery	16
Installing the battery	17
Solid-state drive	17
Removing the M.2 2230 solid-state drive	17
Installing the M.2 2230 solid-state drive	19
Removing the M.2 2280 solid-state drive	20
Installing the M.2 2280 solid-state drive	22
Memory module	23
Removing the memory module	23
Installing the memory module	24
Wireless card	25
Removing the wireless card	25
Installing the wireless card	26
Display assembly	27
Removing the display assembly	27
Installing the display assembly	28
Power-adapter port	30
Removing the power-adapter port	30
Installing the power-adapter port	31
I/O board	31
Removing the I/O board	31
Installing the I/O board	32
Fans	33
Removing the left fan	33
Installing the left fan	34
Removing the right fan	35
Installing the right fan	36
Heat sink	37
Removing the heat sink	37
Installing the heat sink	38
Power-button board	39
Removing the power-button board	39
Installing the power-button board	40
Power button with optional fingerprint reader	41
Removing the power button with optional fingerprint reader	41
Installing the power button with optional fingerprint reader	42
System board	43
Removing the system board	43
Installing the system board	46
Speakers	48
Removing the speakers	48
Installing the speakers	49
Palm-rest and keyboard assembly	50
Removing the palm-rest and keyboard assembly	50
Installing the palm-rest and keyboard assembly	51
Drivers and downloads	53
System setup	54
BIOS overview	54
Entering BIOS setup program	54
Navigation keys	54
Boot Sequence	55
System setup options	55
System and setup password	59
Assigning a system setup password	59
Deleting or changing an existing system setup password	60
Clearing BIOS (System Setup) and System passwords	60
Updating the BIOS	61
Updating the BIOS in Windows	61
Updating the BIOS using the USB drive in Windows	61
Updating the BIOS from the F12 One-Time boot menu	61
Troubleshooting	63
Handling swollen Lithium-ion batteries	63
Locate the Service Tag or Express Service Code of your Dell computer	63
System-diagnostic lights	64
SupportAssist \| On-board Diagnostics	65
Recovering the operating system	65
WiFi power cycle	65

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Steps

Peel off the Mylar that covers the fingerprint-reader cable.

Peel off the tape that secures the fingerprint-reader cable to the palm-rest and keyboard assembly.

Open the latch and disconnect the fingerprint-reader cable from the I/O board.

Steps 1 to 3 are applicable to computers shipped with a fingerprint reader.

Remove the screw (M2x3) that secures the power button with optional fingerprint reader to the palm-rest and keyboard

assembly.

Peel the tape that secures the fingerprint-reader cable to the palm-rest and keyboard assembly.

Lift the power button with optional fingerprint reader off the palm-rest and keyboard assembly.

Installing the power button with optional fingerprint reader

Prerequisites

If you are replacing a component, remove the existing component before performing the installation process.

About this task

The following image(s) indicate the location of the power button with optional fingerprint reader and provides a visual

representation of the installation procedure.

Removing and installing components