Chromebook 5190 Owners Manual
Working on your computer
Removing and installing components
Technology and components
Product specification for Chromebook 5190
Software
- Operating system
- View system information
Diagnostic and troubleshooting
Contacting Dell

DELL 5190 User Manual

Displayed below is the user manual for 5190 by DELL which is a product in the Notebooks category. This manual has pages.

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Chromebook 5190

Owners Manual

Regulatory Model: P28T

Regulatory Type: P28T001

Notes, cautions, and warnings

NOTE: A NOTE indicates important information that helps you make better use of your product.

CAUTION: A CAUTION indicates either potential damage to hardware or loss of data and tells you how to avoid the problem.

WARNING: A WARNING indicates a potential for property damage, personal injury, or death.

may be trademarks of their respective owners.

2018 - 02

Rev. A00

Contents

1 Working on your computer............................................................................................................................. 5

Safety precautions.............................................................................................................................................................5

Standby power............................................................................................................................................................. 5

Bonding ........................................................................................................................................................................ 5

Electrostatic discharge — ESD protection...............................................................................................................5

ESD eld service kit ....................................................................................................................................................6

Transporting sensitive components........................................................................................................................... 7

Before working inside your computer.............................................................................................................................. 7

After working inside your computer.................................................................................................................................7

2 Removing and installing components............................................................................................................. 9

microSD card...................................................................................................................................................................... 9

Removing microSD card..............................................................................................................................................9

Installing microSD card................................................................................................................................................ 9

Base cover.......................................................................................................................................................................... 9

Removing the base cover........................................................................................................................................... 9

Installing the base cover............................................................................................................................................ 12

Battery............................................................................................................................................................................... 12

Removing the battery................................................................................................................................................ 12

Installing the battery...................................................................................................................................................15

Speaker..............................................................................................................................................................................15

Removing speaker...................................................................................................................................................... 15

Installing speaker.........................................................................................................................................................17

WLAN card........................................................................................................................................................................ 17

Removing WLAN card................................................................................................................................................17

Installing WLAN card..................................................................................................................................................18

Input Output board...........................................................................................................................................................19

Removing Input Output board.................................................................................................................................. 19

Installing Input output board.....................................................................................................................................20

Touchpad........................................................................................................................................................................... 21

Removing the touchpad.............................................................................................................................................21

Installing the touchpad.............................................................................................................................................. 23

Keyboard........................................................................................................................................................................... 23

Removing keyboard................................................................................................................................................... 23

Installing keyboard......................................................................................................................................................25

System board....................................................................................................................................................................26

Removing system board............................................................................................................................................26

Installing system board..............................................................................................................................................29

Display assembly.............................................................................................................................................................. 29

Removing display assembly...................................................................................................................................... 29

Installing display assembly..........................................................................................................................................31

Display bezel..................................................................................................................................................................... 32

Removing display bezel............................................................................................................................................. 32

Contents 3

Installing display bezel................................................................................................................................................34

Display panel..................................................................................................................................................................... 34

Removing display panel............................................................................................................................................. 34

Installing display panel................................................................................................................................................37

Display hinges................................................................................................................................................................... 37

Removing display hinge............................................................................................................................................. 37

Installing display hinge............................................................................................................................................... 38

Display cable..................................................................................................................................................................... 39

Removing display cable............................................................................................................................................. 39

Installing display cable................................................................................................................................................40

Camera..............................................................................................................................................................................40

Removing camera...................................................................................................................................................... 40

Installing camera......................................................................................................................................................... 41

Palm rest............................................................................................................................................................................ 41

Replacing palmrest..................................................................................................................................................... 41

3 Technology and components........................................................................................................................43

Keyboard........................................................................................................................................................................... 43

Keyboard keys function.............................................................................................................................................43

Touchpad...........................................................................................................................................................................45

Bluetooth...........................................................................................................................................................................46

4 Product specication for Chromebook 5190................................................................................................ 47

5 Software......................................................................................................................................................48

Operating system.............................................................................................................................................................48

Chrome OS................................................................................................................................................................. 48

Veried Boot...............................................................................................................................................................49

Disk Partition Map..................................................................................................................................................... 50

Developer and Recovery mode.................................................................................................................................51

Coreboot and U-boot Custom Firmware.................................................................................................................51

Chrome vs Chromium OS......................................................................................................................................... 52

View system information.................................................................................................................................................52

6 Diagnostic and troubleshooting................................................................................................................... 56

Basic troubleshooting......................................................................................................................................................56

Power issues...............................................................................................................................................................56

CROSH..............................................................................................................................................................................60

CROSH commands.......................................................................................................................................................... 61

Chrome commands..........................................................................................................................................................63

Commonly used CROSH command.............................................................................................................................. 69

Check battery charging status.................................................................................................................................69

Reset Chromebook.......................................................................................................................................................... 76

Recovery Chromebook.................................................................................................................................................... 81

Recovering the Chromebook.................................................................................................................................... 81

7 Contacting Dell............................................................................................................................................ 85

4Contents

Working on your computer

Topics:

• Safety precautions

• Before working inside your computer

• After working inside your computer

Safety precautions

The safety precautions chapter details the primary steps to be taken before performing any disassembly instructions.

Observe the following safety precautions before you perform any installation or break/x procedures involving disassembly or reassembly:

• Turn o the system and all attached peripherals.

• Disconnect the system and all attached peripherals from AC power.

• Disconnect all network cables, telephone, and telecommunications lines from the system.

• Use an ESD eld service kit when working inside any notebook to avoid electrostatic discharge (ESD) damage.

• After removing any system component, carefully place the removed component on an anti-static mat.

• Wear shoes with non-conductive rubber soles to reduce the chance of getting electrocuted.

Standby power

Dell products with standby power must be unplugged before you open the case. Systems that incorporate standby power are essentially

powered while turned o. The internal power enables the system to be remotely turned on (wake on LAN) and suspended into a sleep

mode and has other advanced power management features.

Unplugging, pressing and holding the power button for 15 seconds should discharge residual power in the system board, notebooks

Bonding

Bonding is a method for connecting two or more grounding conductors to the same electrical potential. This is done through the use of a

eld service electrostatic discharge (ESD) kit. When connecting a bonding wire, ensure that it is connected to bare metal and never to a

painted or non-metal surface. The wrist strap should be secure and in full contact with your skin, and ensure that you remove all jewelry

such as watches, bracelets, or rings prior to bonding yourself and the equipment.

Electrostatic discharge — ESD protection

ESD is a major concern when you handle electronic components, especially sensitive components such as expansion cards, processors,

memory DIMMs, and system boards. Very slight charges can damage circuits in ways that may not be obvious, such as intermittent

problems or a shortened product life span. As the industry pushes for lower power requirements and increased density, ESD protection is an

increasing concern.

Due to the increased density of semiconductors used in recent Dell products, the sensitivity to static damage is now higher than in previous

Dell products. For this reason, some previously approved methods of handling parts are no longer applicable.

Working on your computer 5

Two recognized types of ESD damage are catastrophic and intermittent failures.

•Catastrophic – Catastrophic failures represent approximately 20 percent of ESD-related failures. The damage causes an immediate and

complete loss of device functionality. An example of catastrophic failure is a memory DIMM that has received a static shock and

immediately generates a "No POST/No Video" symptom with a beep code emitted for missing or nonfunctional memory.

•Intermittent – Intermittent failures represent approximately 80 percent of ESD-related failures. The high rate of intermittent failures

means that most of the time when damage occurs, it is not immediately recognizable. The DIMM receives a static shock, but the

tracing is merely weakened and does not immediately produce outward symptoms related to the damage. The weakened trace may

take weeks or months to melt, and in the meantime may cause degradation of memory integrity, intermittent memory errors, etc.

The more dicult type of damage to recognize and troubleshoot is the intermittent (also called latent or "walking wounded") failure.

Perform the following steps to prevent ESD damage:

• Use a wired ESD wrist strap that is properly grounded. The use of wireless anti-static straps is no longer allowed; they do not provide

adequate protection. Touching the chassis before handling parts does not ensure adequate ESD protection on parts with increased

sensitivity to ESD damage.

• Handle all static-sensitive components in a static-safe area. If possible, use anti-static oor pads and workbench pads.

• When unpacking a static-sensitive component from its shipping carton, do not remove the component from the anti-static packing

material until you are ready to install the component. Before unwrapping the anti-static packaging, ensure that you discharge static

electricity from your body.

• Before transporting a static-sensitive component, place it in an anti-static container or packaging.

ESD eld service kit

The unmonitored Field Service kit is the most commonly used service kit. Each Field Service kit includes three main components: anti-static

mat, wrist strap, and bonding wire.

Components of an ESD eld service kit

The components of an ESD eld service kit are:

•Anti-Static Mat – The anti-static mat is dissipative and parts can be placed on it during service procedures. When using an anti-static

mat, your wrist strap should be snug and the bonding wire should be connected to the mat and to any bare metal on the system being

worked on. Once deployed properly, service parts can be removed from the ESD bag and placed directly on the mat. ESD-sensitive

items are safe in your hand, on the ESD mat, in the system, or inside a bag.

•Wrist Strap and Bonding Wire – The wrist strap and bonding wire can be either directly connected between your wrist and bare metal

on the hardware if the ESD mat is not required, or connected to the anti-static mat to protect hardware that is temporarily placed on

the mat. The physical connection of the wrist strap and bonding wire between your skin, the ESD mat, and the hardware is known as

bonding. Use only Field Service kits with a wrist strap, mat, and bonding wire. Never use wireless wrist straps. Always be aware that the

internal wires of a wrist strap are prone to damage from normal wear and tear, and must be checked regularly with a wrist strap tester

in order to avoid accidental ESD hardware damage. It is recommended to test the wrist strap and bonding wire at least once per week.

•ESD Wrist Strap Tester – The wires inside of an ESD strap are prone to damage over time. When using an unmonitored kit, it is a best

practice to regularly test the strap prior to each service call, and at a minimum, test once per week. A wrist strap tester is the best

method for doing this test. If you do not have your own wrist strap tester, check with your regional oce to nd out if they have one.

To perform the test, plug the wrist-strap's bonding-wire into the tester while it is strapped to your wrist and push the button to test. A

green LED is lit if the test is successful; a red LED is lit and an alarm sounds if the test fails.

•Insulator Elements – It is critical to keep ESD sensitive devices, such as plastic heat sink casings, away from internal parts that are

insulators and often highly charged.

•Working Environment – Before deploying the ESD Field Service kit, assess the situation at the customer location. For example,

deploying the kit for a server environment is dierent than for a desktop or portable environment. Servers are typically installed in a rack

within a data center; desktops or portables are typically placed on oce desks or cubicles. Always look for a large open at work area

that is free of clutter and large enough to deploy the ESD kit with additional space to accommodate the type of system that is being

repaired. The workspace should also be free of insulators that can cause an ESD event. On the work area, insulators such as Styrofoam

and other plastics should always be moved at least 12 inches or 30 centimeters away from sensitive parts before physically handling any

hardware components

•ESD Packaging – All ESD-sensitive devices must be shipped and received in static-safe packaging. Metal, static-shielded bags are

preferred. However, you should always return the damaged part using the same ESD bag and packaging that the new part arrived in.

The ESD bag should be folded over and taped shut and all the same foam packing material should be used in the original box that the

new part arrived in. ESD-sensitive devices should be removed from packaging only at an ESD-protected work surface, and parts should

6Working on your computer

never be placed on top of the ESD bag because only the inside of the bag is shielded. Always place parts in your hand, on the ESD mat,

in the system, or inside an anti-static bag.

•Transporting Sensitive Components – When transporting ESD sensitive components such as replacement parts or parts to be

returned to Dell, it is critical to place these parts in anti-static bags for safe transport.

ESD protection summary

It is recommended that all eld service technicians use the traditional wired ESD grounding wrist strap and protective anti-static mat at all

times when servicing Dell products. In addition, it is critical that technicians keep sensitive parts separate from all insulator parts while

performing service and that they use anti-static bags for transporting sensitive components.

Transporting sensitive components

When transporting ESD sensitive components such as replacement parts or parts to be returned to Dell, it is critical to place these parts in

anti-static bags for safe transport.

Lifting equipment

Adhere to the following guidelines when lifting heavy weight equipment:

CAUTION: Do not lift greater than 50 pounds. Always obtain additional resources or use a mechanical lifting device.

1 Get a rm balanced footing. Keep your feet apart for a stable base, and point your toes out.

2 Tighten stomach muscles. Abdominal muscles support your spine when you lift, osetting the force of the load.

3 Lift with your legs, not your back.

4 Keep the load close. The closer it is to your spine, the less force it exerts on your back.

5 Keep your back upright, whether lifting or setting down the load. Do not add the weight of your body to the load. Avoid twisting your

body and back.

6 Follow the same techniques in reverse to set the load down.

Before working inside your computer

1 Ensure that your work surface is at and clean to prevent the computer cover from being scratched.

2 Turn o your computer.

3 If the computer is connected to a docking device (docked), undock it.

4 Disconnect all network cables from the computer (if available).

CAUTION: If your computer has an RJ45 port, disconnect the network cable by rst unplugging the cable from your

computer.

5 Disconnect your computer and all attached devices from their electrical outlets.

6 Open the display.

7 Press and hold the power button for few seconds, to ground the system board.

CAUTION: To guard against electrical shock unplug your computer from the electrical outlet before performing Step # 8.

CAUTION: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching an

unpainted metal surface at the same time as touching a connector on the back of the computer.

8 Remove any installed ExpressCards or Smart Cards from the appropriate slots.

After working inside your computer

After you complete any replacement procedure, ensure that you connect any external devices, cards, and cables before turning on your

computer.

Working on your computer 7

CAUTION: To avoid damage to the computer, use only the battery designed for this particular Dell computer. Do not use batteries

designed for other Dell computers.

1 Replace the battery.

2 Replace the base cover.

3 Connect any external devices, such as a port replicator or media base, and replace any cards, such as an ExpressCard.

4 Connect any telephone or network cables to your computer.

CAUTION: To connect a network cable, rst plug the cable into the network device and then plug it into the

computer.

5 Connect your computer and all attached devices to their electrical outlets.

6 Turn on your computer.

8 Working on your computer

Removing and installing components

microSD card

Removing microSD card

1 Follow the procedure in Before working inside your computer.

2 Press in on the microSD card to release it from the computer.

3 Remove the microSD card from the computer.

Installing microSD card

1 Slide the SD card into its slot until it clicks into place.

2 Install the microSD card.

3 Follow the procedure in After working inside your computer.

Base cover

Removing the base cover

1 Follow the procedure in Before working inside your computer.

2 Remove the microSD card.

3 To remove the base cover:

a Remove the 9 (M2.5x7.5) screws that secure the base cover to the system.

Removing and installing components 9

b Pry the base cover from the edge using a plastic scribe [1] and lift the base cover from the system [2].

10 Removing and installing components

c Lift the base cover away from the system.

Removing and installing components 11

Installing the base cover

1 Toe in the base cover front edge into the system.

2 Press the edges of the cover until it clicks into place.

3 Replace the M2.5x7.5 screws to secure the base cover to the system.

4 Install the microSD card.

5 Follow the procedure in After working inside your computer.

Battery

Removing the battery

1 Follow the procedure in Before working inside your computer.

2 Remove the:

amicroSD card

bbase cover

3 To remove the battery:

a Remove the single (M2x3) screw and lift the right metal bracket that secures the battery cable to the system board [1, 2].

b Peel the adhesive tape that secures the keyboard cable in place [3].

c Disconnect the keyboard cable from the connector in the system board [4].

12 Removing and installing components

d Remove the single (M2x3) screw and lift the left metal bracket that secures the battery cable to the connector on the battery

[1, 2].

e Unroute the battery cable [3].

f Peel the adhesive that secures the battery cable to the system board [4].

Removing and installing components 13

g Remove the 3 (M2x3) screws that secure the battery to the system [1].

h Lift the battery away from the system [2].

14 Removing and installing components

Installing the battery

1 Insert the battery into the slot on the system.

2 Replace the 3 (M2x3) screws that secure the battery to the system.

3 Route the battery cable and connect the cable to the connector on the system board.

4 Ax the 2 adhesive tap to secure the cable to the system board.

5 Place the 2 metal brackets to secure the battery cable to its connector on the system board and the battery.

6 Replace the 2 (M2x3) screws, one on each metal bracket, to secure each bracket to the system.

7 Install the:

abase cover

bmicroSD card

8 Follow the procedure in After working inside your computer.

Speaker

Removing speaker

1 Follow the procedure in Before working inside your computer.

2 Remove the:

amicroSD card

bbase cover

cbattery

3 To remove the speaker:

a Disconnect the speaker cable from the connector on the system board [1].

b Peel the adhesive tape that secures the speaker cable to the system [2, 4].

c Unroute the speaker cable from the routing channel [3].

Removing and installing components 15

d Lift the speaker away from the system.

16 Removing and installing components

Installing speaker

1 Place the speakers into the slots on the system.

2 Route the speaker cable through the retention clips in the routing channel.

3 Ax the adhesive tape to secure the speaker cable to the system.

4 Connect the speaker cable to the connector on the system board.

5 Install the:

abattery

bbase cover

cmicroSD card

6 Follow the procedure in After working inside your computer.

WLAN card

Removing WLAN card

1 Follow the procedure in Before working inside your computer.

2 Remove the:

amicroSD card

bbase cover

cbattery

3 To remove the WLAN card:

a Remove the single (M2x3) screw that secures the WLAN card bracket to the system [1].

b Remove the WLAN card bracket that secures the WLAN antenna cables [2].

c Disconnect the WLAN antenna cables from the connectors on the WLAN card [3].

d Slide and lift the WLAN card away from the system [4].

Removing and installing components 17

Installing WLAN card

1 Insert the WLAN card into the slot on the system.

2 Connect the WLAN antenna cables to the connectors on the WLAN card.

3 Place the WLAN card bracket to secure the WLAN cables to the WLAN card.

4 Replace the single (M2x3) screw to secure the WLAN card bracket to the system.

5 Install the:

abattery

bbase cover

cmicroSD card

6 Follow the procedure in After working inside your computer.

18 Removing and installing components

Input Output board

Removing Input Output board

1 Follow the procedure in Before working inside your computer.

2 Remove the:

amicroSD card

bbase cover

cbattery

3 To remove the Input Output board (I/O board):

a Lift the latch and, disconnect the two I/O cables from the connector on the I/O board [1].

b Remove the 2 (M2x4) screws that secure the I/O bracket to the system [2].

c Open the I/O bracket up to 90° backward and release the bracket from the slot on the system [3].

d Lift the bracket away from the system.

e Remove the 2 (M2x3) screws that secure the I/O board to the system [1].

f Lift the I/O board away from the system [2].

Removing and installing components 19

Installing Input output board

1 Place the Input output (I/O) board to its slot in the system.

2 Replace the 2 (M2x3) screws to secure the I/O board to the system board.

3 Connect the two I/O cables and close the latch to secure it to the I/O board.

4 Place the I/O bracket and replace the 2 (M2x4) screws to secure the bracket to the system.

5 Install the:

abattery

bbase cover

cmicroSD card

6 Follow the procedure in After working inside your computer.

20 Removing and installing components

Touchpad

Removing the touchpad

1 Follow the procedure in Before working inside your computer.

2 Remove the:

amicroSD card

bbase cover

cbattery

3 To remove the touchpad:

a Remove the 3 (M2x3) screws that secure the touchpad bracket to the system [1].

b Remove the touchpad bracket [2].

c Lift the latch and, disconnect the touchpad cable from the connector in the touchpad frame [1].

d Peel the adhesive tape that secures the touchpad frame to the system [2].

Removing and installing components 21

e Remove the 3 (M2x2) screws that secure the touchpad frame to the system [1].

f Lift the touchpad away from the system [2].

22 Removing and installing components

Installing the touchpad

1 Place the touchpad into its slot on the system.

2 Replace the 3 screws to secure the touchpad frame to the system.

3 Connect the touchpad cable to the connector in the touchpad frame.

4 Ax the adhesive tape to secure the touchpad frame to the system.

5 Place the touchpad bracket into the slot.

6 Replace the 3 screws to secure the touchpad bracket to the system.

7 Install the:

abattery

bbase cover

cmicroSD card

8 Follow the procedure in After working inside your computer.

Keyboard

Removing keyboard

1 Follow the procedure in Before working inside your computer.

2 Remove the:

amicroSD card

bbase cover

cbattery

3 To remove the keyboard:

a Release the latch and, disconnect the keyboard cable from the connector on the system board [1].

b Use a plastic scribe to release the keyboard from the two release holes in the system [2].

NOTE: The two release holes for the keyboard is indicated by the "KB" labeling.

Removing and installing components 23

c Turn the system and carefully pull the keyboard cable through the gap in the palm rest.

d Lift the keyboard away from the system.

24 Removing and installing components

Installing keyboard

1 Carefully insert the keyboard cable through the gap on the palm rest before securing the keyboard onto the system.

2 Align the keyboard trim with the tabs on the system, and press it until it clicks into place.

3 Turn the system and connect the keyboard cable to the connector on the system board.

4 Install the:

abattery

bbase cover

cmicroSD card

5 Follow the procedure in After working inside your computer.

Removing and installing components 25

System board

Removing system board

1 Follow the procedure in Before working inside your computer.

2 Remove the:

amicroSD card

bbase cover

cbattery

3 To remove the system board:

a Lift the latch and, disconnect the 2 Input/Output cables from the connector on the system board [1].

b Lift the latch and, disconnect the touchpad cable from the connector on the system board [2].

c Release the tabs and, disconnect the keyboard cable from the connector on the system board [3].

d Disconnect speaker cable from the connector on the system board [4].

e Remove the single (M2x4) screw that secures the eDP bracket to the system board [1].

f Remove the eDP bracket away from the system [2].

g Peel the adhesive tape that secures the eDP cable to the system board [3].

h Lift the latch and, disconnect the eDP cable from the connector on the system board [4].

i Peel the adhesive tape that secures the cable to the system [5].

26 Removing and installing components

j Remove the single (M2x4) screw that secures the system board bracket to the system [1].

k Lift the system board bracket [2] and release the hook on the bracket from the retention tab in the system [3].

Removing and installing components 27

l Remove the 3 (M2x3) screws that secure the system board to the system [1].

m Lift the system board away from the system [2].

28 Removing and installing components

Installing system board

1 Align the screw holes on the system board with the screw holes on the system.

2 Replace the 3 screws to secure the system board to the system.

3 Align the system board bracket and snap the hook on the bracket to the retention tab in the system.

4 Place the system board bracket and replace the single screw to secure the bracket to the system.

5 Connect the eDP cable to the connector in the system board.

6 Ax the adhesive tape to secure the eDP cable to the system board.

7 Place the eDP bracket over the connector and replace the single screw to secure the eDP bracket to the system board.

8 Connect the speaker cable to the connector in the system board.

9 Connect the 2 Input/Output cable, touchpad cable and keyboard cable to the connectors on the system board.

10 Install the:

abattery

bbase cover

cmicroSD card

11 Follow the procedure in After working inside your computer.

Display assembly

Removing display assembly

1 Follow the procedure in Before working inside your computer.

2 Remove the:

amicroSD card

bbase cover

cbattery

3 To remove the display assembly:

a Remove the single (M2x4) screw that secures the eDP bracket to the system board [1].

b Remove the eDP bracket away from the system [2].

c Peel the adhesive tape that secures the eDP cable to the system board [3].

d Lift the latch and, disconnect the eDP cable from the connector on the system board [4].

e Peel the adhesive tape that secures the cable to the system [5].

Removing and installing components 29

f Turn the system.

30 Removing and installing components

g Place the system in a 90° position on the edge of a plane surface with the display facing down.

h Remove the 6 (M2.5x5) display hinge bracket screws that secure the display assembly to the system [1].

i Lift the display assembly away from the system [2].

Installing display assembly

1 Place the chassis on the edge of a plane surface.

2 Align the display assembly with the screw holders on the system.

3 Replace the 6 display hinge bracket screws to secure the display assembly to the system.

4 Lift the system and close the display.

5 Connect the eDP cable to the connector on the system board.

6 Ax the adhesive tape to secure the eDP cable to the system.

7 Place the eDP metal bracket to secure the eDP cable.

8 Replace the single screw to secure the eDP bracket to the system.

9 Install the:

abattery

bbase cover

cmicroSD card

10 Follow the procedure in After working inside your computer.

Removing and installing components 31

Display bezel

Removing display bezel

1 Follow the procedure in Before working inside your computer.

2 Remove the:

amicroSD card

bbase cover

cbattery

ddisplay assembly

3 To remove the display bezel:

a Remove the mylar cap that secures the display bezel to the display assembly.

b Remove the 4 (M2x3.5) screws that secure the display bezel to the display assembly.

32 Removing and installing components

c Pry the edges to release the display bezel from the display assembly.

Removing and installing components 33

Installing display bezel

1 Place the display bezel on the display assembly.

2 Starting from the top corner, press on the display bezel and work around the entire bezel until it clicks on to the display assembly.

3 Replace the 4 screws to secure the display bezel to the display assembly

4 Replace the mylar caps on the display bezel.

5 Install the:

adisplay assembly

bbattery

cbase cover

dmicroSD card

6 Follow the procedure in After working inside your computer.

Display panel

Removing display panel

1 Follow the procedure in Before working inside your computer.

2 Remove the:

amicroSD card

bbase cover

cbattery

ddisplay assembly

edisplay bezel

3 To remove the display panel:

a Remove the 4 (M2x3) screws that secure the display panel to the display assembly [1] and lift to turn the display panel to access

the eDP cable [2]

34 Removing and installing components

b Peel the adhesive tape that secures the eDP cable to the display panel [1].

c Lift the latch and, disconnect the display cable from the connector in the display panel [2, 3].

Removing and installing components 35

d Lift the display panel away from the display assembly.

36 Removing and installing components

Installing display panel

1 Connect the eDP cable to the connector, and ax the tape.

2 Replace the display panel to align with the screw holders on the display assembly.

3 Replace the 4 screws to secure the display panel to the display assembly.

4 Install the:

adisplay bezel

bdisplay assembly

cbattery

dbase cover

emicroSD card

5 Follow the procedure in After working inside your computer.

Display hinges

Removing display hinge

1 Follow the procedure in Before working inside your computer.

2 Remove the:

amicroSD card

bbase cover

cbattery

ddisplay assembly

edisplay bezel

fdisplay panel

3 To remove the display hinge:

a Remove the 2 (M2x3) screws and 4 (M2.5x2.5) screws that secure the display hinge to the display assembly.

Removing and installing components 37

b Lift the display hinge away from the display assembly.

Installing display hinge

1 Place the display hinge cover on the display assembly.

2 Replace the 2 (M2x3) screws and 4 (M2.5x2.5) screws to secure the display hinge to the display assembly.

38 Removing and installing components

3 Install the:

adisplay panel

bdisplay bezel

cdisplay assembly

dbattery

ebase cover

fmicroSD card

4 Follow the procedure in After working inside your computer.

Display cable

Removing display cable

1 Follow the procedure in Before working inside your computer.

2 Remove the:

amicroSD card

bbase cover

cbattery

ddisplay assembly

edisplay bezel

fdisplay panel

3 To remove the display cable:

a Unroute the display cable from the display assembly [1].

b Remove the display cable from the system [2].

Removing and installing components 39

Installing display cable

1 Route the display cable to its slot in the display assembly.

2 Install the:

adisplay panel

bdisplay bezel

cdisplay assembly

dbattery

ebase cover

fmicroSD card

3 Follow the procedure in After working inside your computer.

Camera

Removing camera

1 Follow the procedure in Before working inside your computer.

2 Remove the:

amicroSD card

bbase cover

cbattery

ddisplay assembly

edisplay bezel

fdisplay panel

3 To remove the camera:

a Use a plastic scribe to pull the camera out from the chassis [1].

b Peel the adhesive tape that secures the camera to the chassis [2].

c Disconnect the camera cable from the connector [3].

40 Removing and installing components

d Lift the camera away from the display assembly.

Installing camera

1 Align and place the camera to its slot in the display assembly.

2 Connect the camera cable to the connector on the display assembly.

3 Ax the adhesive tape to secure the camera cable to the system.

4 Install the:

adisplay panel

bdisplay bezel

cdisplay assembly

dbattery

ebase cover

fmicroSD card

5 Follow the procedure in After working inside your computer.

Palm rest

Replacing palmrest

1 Follow the procedure in Before working inside your computer.

2 Remove the:

Removing and installing components 41

amicroSD card

bbase cover

cbattery

dspeaker

einput and output board

fWLAN card

gtouchpad

hkeyboard

isystem board

jdisplay assembly

3 The component you are left with is the palmrest.

4 Install the following in the palmrest:

adisplay assembly

bsystem board

ckeyboard

dtouchpad

eWLAN card

finput and output board

gspeaker

hbattery

ibase cover

jmicroSD card

5 Follow the procedure in After working inside your computer.

42 Removing and installing components

Technology and components

This chapter details the technology and components available in the system.

Topics:

• Keyboard

• Touchpad

• Bluetooth

Keyboard

Dell Chromebook 5190 keyboards have a few extra features to help you browse the web eortlessly and eciently. The keyboard contains a

dedicated search key and a new row of web shortcut keys. A standard USB Windows keyboard can also be used with the Chromebook,

using the same keyboard shortcuts. The image below shows the keyboard layout.

Keyboard keys function

The Chrome device keyboard is designed to help you get to the things you need the most. The table below is an overview of the special

keys on the top row of the keyboard:

Table 1. Special keys

Special keys

Go to the previous page in browser history

Go to the next page in browser history

Technology and components 43

Special keys

Reload current page

Enter Immersive mode, which hides the tabs and launcher

Enter Overview mode, which shows all windows

Decrease screen brightness

Increase screen brightness

Mute

Decrease the volume

Increase the volume

Search applications and the web at the same time. On a Chromebook, this key is on the side, where the Caps Lock key

is normally located.

Keyboard shortcut keys

Table 2. Shortcut keys

Shortcut keys

Function Combination keys

Page up Press Alt and the up arrow

Page down Press Alt and the down arrow

Home Press Ctrl+Alt, and the up arrow

End Press, Ctrl+Alt and the down arrow

Delete Press Alt+Backspace

Toggle the bookmark bar Ctrl+Shift+B

Search current webpage Ctrl+F

Open a new tab Ctrl+T

Open a new window Ctrl+N

Open the link you clicked in a new background tab Press Alt and click a link

Switch to next tab Ctrl+Tab

Sign out of Google Account Ctrl+Shift+Q

44 Technology and components

Shortcut keys

Close current tab Ctrl+W

To see more shortcuts, simply press Ctrl+Alt+? To open the keyboard viewer on your screen.

Touchpad

This page contains information for Dell Chromebook 5190 touchpad gestures.

The following table lists some gestures and actions supported by the Chromebook touchpad:

Table 3. Touch pad gestures

Touchpad gestures

Gestures Explanation

Simply move your nger across the touchpad.

Press down on the lower half of the touchpad. Since tap-to-click is enabled by default, you can quickly tap the

touchpad to click.

Click the touchpad with two ngers.

Place two ngers on the touchpad and move them up and down to scroll vertically, left and right to scroll

horizontally. If you have Australian scrolling enabled, move two ngers up to scroll down. (It works in the same

way as say, your smartphone or tablet.) If you have multiple browser tabs open, you can also swipe left and

right with three ngers to quickly move between tabs.

Swipe Quickly move two ngers left or right to go backward or forward on web pages or while using apps.

Technology and components 45

Touchpad gestures

Click the item you want to move with one nger. With a second nger, move the item. Release both ngers to

drop the item at its new location.

Bluetooth

This section outlines the instruction to pair a bluetooth device with your Chrome devices.

Bluetooth technology lets you connect devices wirelessly over short distances. To use the Bluetooth accessories with your Chromebook,

rst check if your Chromebook supports Bluetooth. You will then need to pair it with the accessory.

To see if you can use the Bluetooth accessories with your Chromebook, click the status area in the lower right corner, where your account

picture appears. If you see the Bluetooth icon or in the menu, your Chromebook supports Bluetooth. If you do not see either of

these icons, your Chromebook does not support Bluetooth. If your Chromebook supports Bluetooth, it can connect to a wide range of the

Bluetooth accessories, including the following:

• Keyboards

• Mice

• Speakers

• Headphones

• Headsets (audio only)

To connect a Bluetooth device with your Chromebook, you need to pair them. Here is how:

1 Sign in to your Chromebook.

2 Click the status area in the lower-right corner, where your account picture appears.

3 Select your Bluetooth status in the menu that appears.

4 If Bluetooth is disconnected, click the disconnected icon. or click Enable Bluetooth in the menu. Your Chromebook will

automatically begin scanning for available Bluetooth devices.

5 Pick the device you want to add from the list of available Bluetooth devices and click Connect.

6 Follow the instructions on the screen to connect your Bluetooth device.

• If you are connecting a mouse, no PIN is normally required. If you are prompted for a PIN, enter the PIN for your mouse using your

Chrome device's keyboard.

• If you are connecting a keyboard, enter the randomly generated PIN on the keyboard you wish to pair and press Enter.

To conrm that your Bluetooth device is connected, check the Bluetooth status. You should see your device listed there.

NOTE: Just got your Chromebook or Chromebox? If you are turning on your chrome device for the rst time and you have a

Bluetooth device nearby that is also turned on, your chrome device may automatically detect the device and show you steps to

pair it. You will see these instructions only if your chrome device does not already have a similar device connected or its

functionality is not built in, like a keyboard or trackpad.

46 Technology and components

Product specication for Chromebook 5190

This topics lists out the technical specications for your computer.

Table 4. Specications

Type Feature

Model Number Chromebook 5190

Processor family Intel Apollo Lake Celeron processor (Dual and Quad Core)

Operating System Google Chrome OS

Memory congurations • LPDDR4 2400 Mhz

• Max RAM: Upto 8 GB

• Memory conguration: 4 GB, 8 GB

Chipset Intel Apollo Lake

Graphics Intel HD graphics 500 with 12 EUs (integrated with the processor)

Display 11.6 inch HD 16:9 (1366 X 768) Anti Glare, non touch

Storage options • 16GB eMMC

• 32GB eMMC

• 64GB eMMC

Multimedia • High Quality Speakers

• Headphone/Headset/Microphone combo jack

• Integrated digital microphone: 1 on the bezel

• Integrated HD video webcam

Battery options 42 Whr (3 Cell) Prismatic No ExpressCharge

Power adapter 45 W USB-C adapter

Connectivity • Intel Dual Band Wireless-AC 7265 802.11AC 2x2 Wi-Fi + BT 4.2 LE M.2 Card

Ports, Slots and Chassis • 2 x USB 3.1 Gen 1 port

• 2 x USB Type-C port

• microSD card reader

• Universal mic/headset

• Universal audio jack

Security Noble Wedge Lock

Input device Single Point Sealed non-backlit Keyboard

Multi-touch Sealed Touchpad

Product specication for Chromebook 5190 47

Software

This section provides information about the operating system, commands, and bundled software for Dell .

Topics:

• Operating system

• View system information

Operating system

This page contains information about the operating system used by the Dell Chromebook 5190.

Chrome OS

Chromebooks are powered by the Google Chrome operating system, based on Google's popular Chrome browser. It has been developed to

provide a fast, simple, and more secure computing experience for users who spend most of their time online.

Key Benets

• Speed

• Simplicity

• Security

• Updatability

• Syncronisability

48 Software

• High power at low cost

• Easy to learn and use

• Documents, calendar, e-mail, contacts, and tasks available online and oine, and all securely backed-up and synchronised in the cloud.

• Access to the Chrome web app store

• Killer web apps

• The latest Intel Core processors

• Fun games

• Built-in support for popular le types and external devices

For more information about the Chrome OS, please visit the Chrome OS training page.

Veried Boot

Read Only rmware veries the integrity of Read/Write (R/W) rmware. R/W rmware veries the active Linux kernel. During run time,

the kernel veries each block read from disk.

If a verication step fails and there is no backup option, the machine enters recovery mode.

Software 49

The Developer Mode switch turns o veried boot (at the Kernel stage) to enable users to run Chromium OS (or other OS). The BIOS is

always veried.

Disk Partition Map

There are two copies of Chrome OS on disk: an active copy and a backup copy. Each copy consists of a kernel partition and a root le

system. The backup copy is updated automatically in the background. Users only need to reboot. The partition contains encrypted user

data and is also used in the factory for storing test software.

50 Software

Developer and Recovery mode

Table 5. Developer and Recovery mode

Developer Mode Recovery Mode

• Used to boot without verication.

• Can be turned on via key combination during boot.

• Stateful partition is wiped during transitions.

• Used in the factory to boot test image.

• Allows a user to reinstall the Chrome OS from a USB key or SD

card.

• Recovery mode is entered if veried boot fails.

• A user can force recovery mode via a key combination during

boot.

Coreboot and U-boot Custom Firmware

Coreboot (x86 only)

• Memory and chipset initialization

• Open-source, except for MRC binary from Intel.

U-Boot

• Performs veried boot

• Handles recovery and Developer Mode

• Open source code

Normal boot is very fast, as it takes less than 1 second to start loading kernel. Chromebook does not boot other operating systems such as

Windows or OS X.

Software 51

Chrome vs Chromium OS

Table 6. Dierence between Chromium and Chrome OS

Dierence between Chromium and Chrome OS

Chromium OS Chrome OS

• Is an open source project: http://www.chromium.org/

chromium-os

• Runs on regular PCs and Chrome devices

• Is based on Chromium OS

• Only runs on the Chrome devices with required hardware

features (TPM, RO rmware, recovery button, developer

switch).

• Includes additional licensed features such as the Netix plugin,

video codecs, and fonts

View system information

This page contains all the information about viewing system information for the Dell Chromebook.

Dell Chromebook 5190 does not support Dell BIOS. Hence, there are several ways to check system specications depending on the

information you are searching for. The table below lists some of the most commonly used methods to view system information and

specications.

52 Software

Table 7. View system information

Commands Action and Purpose Screenshot

Chrome:help View basic OS information.

Chrome:settings View information such as

screen resolution options

(Device>Display settings),

touchpad, and other basic

hardware information.

Software 53

Commands Action and Purpose Screenshot

Chrome:system View advanced system

information such as the Google

Chrome version, BIOS

information, CPU information,

memory information, network

status, power supply

information, etc.

54 Software

Commands Action and Purpose Screenshot

Chrome:net-

internals

View advanced networking

information.

Software 55

Diagnostic and troubleshooting

This section covers the diagnostics tool and troubleshooting information for eld service technicians.

Topics:

• Basic troubleshooting

• CROSH

• CROSH commands

• Chrome commands

• Commonly used CROSH command

• Reset Chromebook

• Recovery Chromebook

Basic troubleshooting

This page contains all the information for Dell basic troubleshooting

NOTE: Refer to Google Help Center for the online troubleshooter.

NOTE: Resetting the Chromebook, also known as Powerwash, can be attempted before Recovering the Chromebook.

Recovering the Chromebook is the last resort.

Power issues

Table 8. Power issue

Power issues

Issue Possible solutions

Chromebook would not Power On

If the Chromebook will not turn on, follow these steps:

1 Remove all external devices.

a If the Chromebook starts, reconnect devices one at a

time while restarting the computer to gure out which

device is causing the problem. You are done.

b If the Chromebook still does not start or exhibits the

same problem, do not reconnect anything, and continue

troubleshooting.

2 The battery life might be too low. Plug the Chromebook into

the AC adapter and let it charge for at least an hour and try

turning it on again.

NOTE: When a new Chromebook is used for the

rst time, the battery is still in shipping mode. To

resolve this issue, turn o the Chromebook and plug

in the AC adapter and turn on the Chromebook

again.

3 Depending on the Chromebook you have, you may see a

power indicator light close to the charging port. If you have let

56 Diagnostic and troubleshooting

Power issues

the Chromebook charge and the light is not coming on,

perform a hard reset.

NOTE: You can perform a hard reset by pressing

Refresh + Power.

4 Use a dierent AC adapter with the same power voltage.

5 Remove the AC adapter, and turn on with the battery power

only.

Display issue

Table 9. Display issue

Display issue

Issue Possible solutions

Screen is Blank

If the Chromebook's screen is blank, try the following

troubleshooting steps to resolve the issue, checking to see if the

screen turns on after each step:

1 Make sure the Chromebook is on. If you are using the battery,

plug the Chromebook in and press the power button.

2 Restart the Chromebook by holding the power button down

until the device turns o, then turn it back on again.

3 Reset or Recover the Chromebook.

Audio, screen, and camera issues

Table 10. Audio, screen, and camera issues

Audio, screen, and camera issues

Issues Possible solutions

Audio issues

If you hear static, or the volume from the speakers is low when

attempting to listen to audio:

1 Make sure the device is not muted. Try adjusting the volume.

2 Try rebooting the Chromebook.

3 Try playing audio from various sources, including YouTube and

audio les stored locally on the Chromebook.

If the speakers are not responding when attempting to listen to

audio:

1 Unplug the device from all cables (USB, headphones, and

displays).

2 Try playing audio from various sources, including YouTube and

audio les stored locally on the Chromebook.

3 Try rebooting the Chromebook.

4 If audio still does not respond, try to Reset or Recover the

Chomebook.

Screen issues If the screen is not operating properly (images are too dark or no

image is appearing):

Diagnostic and troubleshooting 57

Audio, screen, and camera issues

1 Try adjusting the brightness with the brightness keys at the

top of the keyboard.

2 In the status area in the bottom-right of the screen, check the

display and make sure there are no issues with a mirrored or

extended display.

3 Try rebooting the Chromebook

4 If the screen issues persist, try to Reset or Recover the

Chomebook.

Camera issues

If the camera is not operating properly (blurry images or poor

performance):

1 Check that the camera is not being blocked or covered by a

privacy screen or other obstruction.

2 Try using dierent apps that use the camera. Try a Google+

Hangout or the onboard camera app

3 Try rebooting the Chromebook

4 If the camera issues persist, try to Reset or Recover the

Chomebook.

Bluetooth issue

Table 11. Bluetooth issue

Bluetooth issue

Issue Possible solutions

Bluetooth issues

If you run into issues while attempting to pair or use a Bluetooth

device with the Chromebook, try the following steps to resolve the

issue:

1 First, make sure that the Bluetooth device you are trying to

pair is supported by the Chromebook.

2 Try disabling and re-enabling Bluetooth connectivity from the

status area in the lower-right corner.

3 Try restarting the Chromebook.

4 If you are still encountering issue with bluetooth, try to Reset

or Recover the Chomebook.

Touchpad and Hotkeys issues

Table 12. Touchpad and hotkeys issues

Touchpad / Hotkeys issues

Issue Possible solutions

Touchpad not responding

If the touch pad has stopped responding, try the following steps to

resolve the issue: Try moving the cursor after each step:

1 Tap the Esc key several times.

2 Drumroll the ngers across the touch pad for a few seconds.

3 Restart the Chrome OS by holding down the power button

until the device turns o, and then turn it back on again.

58 Diagnostic and troubleshooting

Touchpad / Hotkeys issues

4 If the cursor still does not move when using the touch pad, try

logging in from the Guest account using the tab key to

navigate.

5 If users experience touch pad issues with the account that is

not the owner (primary) account, delete the user account and

re-create it. Again, use the tab key to navigate.

6 If none of the above steps work, try to Reset or Recover the

Chomebook.

Top row of keys (Hotkeys) not responding

If a hotkey (like the volume or brightness keys) are not responding,

try the following troubleshooting steps, making sure to test the

keys after each one:

1 If the aected key is volume or brightness, check to make

sure you are not at the upper or lower limit for that setting.

2 If the backward or forward buttons do not work, check that

the same icons in a web browser are not grayed out. For

example, if the back button on a web page is grayed, this is

because the browser is not aware of a page to move

backward to.

3 Restart the Chrome OS by holding down the power button

until the device turns o, and then turn it back on again.

4 Try using the keys in the Guest account.

5 If users experience hotkey issues with the account that is not

the owner (primary) account, delete the user account and re-

create it.

6 If none of the above steps work, try to Reset or Recover the

Chomebook.

Chrome OS issue

Table 13. Chrome OS issue

Chrome OS issues

He’s Dead, Jim! error message

If the Chromebook becomes slow or unresponsive, and the He's

Dead, Jim! error message appears, the system could be running

low on memory.

NOTE: If you terminated the process using Google

Chrome's Task Manager, the system's task manager, or

with a command line tool, this message will appear as well.

1 If the page was not ended intentionally, reload the page to

continue. If the message continues to appear, try closing

inactive tabs or other programs to free up more memory.

2 If issue persists, please see He's Dead, Jim! from Google

knowledge base.

Chrome OS is missing or damaged

If the Chromebook does not start and displays the message,

Chrome OS is missing or damaged. Please insert a recovery USB

stick into the USB ports on the device:

Perform a system recovery. See performing Recover Chromebook

for more information.

Chrome OS stops responding and nothing moves on the computer

display

If the Chrome OS stops responding and nothing moves on the

computer display:

1 Turn o the computer.

Diagnostic and troubleshooting 59

Chrome OS issues

2 Disconnect all peripheral devices, and remove all USB devices

and media cards.

3 Disconnect the AC adapter.

4 Press and hold the power button for 10 seconds.

5 Reconnect the AC adapter, and turn on the system.

6 If issue persists, please perform a Reset or Recover the

Chromebook.

Lost / Forget Sign in password (Chrome OS)

If you lost/forget the sign-in password to the Chromebook:

1 Check if this is a managed device (Enterprise enrolled device).

a If this is a managed device, please contact the

administrator to have them reset the password via

Google Admin Console.

b If this is not a managed device, please proceed with the

following steps:

2 Sign in as guest or use a dierent PC.

3 Open an internet browser, and navigate to https://

www.google.com/accounts/recovery/

4 Select I do not know my password, and then enter the email

address that you use to sign in to Google.

5 Click Continue and follow the on-screen instructions to reset

the password.

Other Chromebook lock up or freeze symptoms that are not listed

here

If none of the above symptoms match the Chromebook’s issue,

refer to Google Help Center for the online troubleshooter and more

help.

CROSH

This topic covers the information you need to know for the Chrome Shell (CROSH). CROSH and the Google Chrome URL commands

provide some troubleshooting tools, information, and advanced settings.

The Chrome OS does not support ePSA, Dell BIOS, the F12 boot menu, or DellConnect. There are no preboot diagnostics. All

troubleshooting must be done inside the OS. Chrome Shell (CROSH) and the Chrome URL commands provide some troubleshooting tools,

information, and advanced settings. CROSH is a command line interface similar to the Linux BASH or Windows command (cmd.exe)

terminals. Chrome OS is based on Linux, but CROSH does not recognize most Linux commands. The most useful commands for

troubleshooting are memory test, storage_test_1, storage_test_2, ping, and tracepath. Ping works dierently than it does in Windows. By

default, it repeats until you press <Ctrl> + <C>, and it does not show any statistics. The tracepath command is similar to the Windows

traceroute command. A detailed explanation of the commands can be viewed below, by typing help, or help_advanced in CROSH.

1 Open the Chrome browser.

60 Diagnostic and troubleshooting

2 Press <Clrl> + <Alt> + <T> The interface appears as shown in the screenshot below:

3 Type in the CROSH command for diagnostics. Type 'help' for a list of available commands. Type help_advanced to display a complete

list of commands for debugging purposes

Alternately, refer to CROSH Commands for the list of the CROSH commands available for diagnostics.

CROSH commands

The table below lists the available commands in Chrome Shell (CROSH).

Table 14. Help commands

Command Purpose

exit Exits the CROSH Shell.

help Displays this help.

help_advanced Displays the help for more advanced commands, used for

debugging.

ping [-c count] [-i interval] [-n] [-s packetsize] [-W waittime] — Sends

ICMP ECHO_REQUEST packets to a network host. If is "gw", then

the next hop gateway for the default route is used. It works just like

the ping command on other operating systems. Press <Clrt> + <C>

to stop the ping process or halt any other command in CROSH.

ssh [optional args...] — Starts the ssh subsystem if invoked without any

arguments. "ssh <user> <host>", "ssh <user> <host> <port>", "ssh<

user>@<host>". or "ssh <user>@<host> <port>" connect without

entering the subsystem

ssh_forget_host Removes a host from the list of known ssh hosts. This command

displays a menu of known hosts and prompts for the host to forget.

top Sets the chaps debug logging level. No arguments start verbose

logging

Diagnostic and troubleshooting 61

Table 15. Advanced help command

Command Purpose

battery_test[<test length>] Tests the battery discharge rate for a given number of seconds. No

argument defaults to a 300 s test.

bt_console [<agent capability>] Enters a Bluetooth debugging console. The Optional argument

species the capability of a pairing agent the console provides; see

the Bluetooth Core specication for valid options.

chaps_debug [start|stop|<log_level>] Sets the chaps debug logging level. No arguments will start verbose

logging.

connectivity Shows connectivity status.

experimental_storage<status|enable|disable> Enables or disables experimental storage features.

_debug [<tag_expr>] [--help] [--list_valid_tags] [--reset] Adds and removes imam debugging tags.

memory_test Performs extensive memory testing on the available free memory.

modem <command> [args...] Interacts with the 3G modem. Run modem help for detailed help.

modem_set_carrier carrier-name Congures the modem for the specied carrier.

network_diag[--date] [--link] [--show-macs] [--wi] [--help] [--wi-

mon] <host>

Performs a suite of network diagnostics and saves a copy of the

output to your download directory

network_logging <wi|cellular|ethernet> Enables a predened set of tags useful for debugging the specied

device.

p2p_update [enable | disable] Enables or disables the peer-to-peer (P2P) sharing of updates over

the local network. This will both attempt to get updates from other

peers in the network and shares the downloaded updates with

them. Run this command without arguments to see the current

state.

rlz < status | enable | disable> Enables or disables RLZ.

rollback Attempts to roll back to the previous update cached on your

system. Only available on non-stable channels and non-enterprise

enrolled devices. Please note that this will power wash your device.

route [-n] [-6] Displays the routing tables.

set_apn [-n <network-id>] [-u <username>] [-p <password>] <apn> Sets the APN to use when connecting to the network specied by

<network-id>. If <network-id> is not specied, use the network-id

of the currently registered network.

set_apn - c Clears the APN to be used, so that the default APN is used instead.

set_arpgw <true | false> Turns on the extra network state checking to make sure the default

gateway is reachable.

set_cellular_ppp [-u <username>] [-p <password>] Sets the PPP username and/or password for an existing cellular

connection. If neither -u nor -p is provided, this shows the existing

PPP username for the cellular connection.

set_cellular_ppp -c Clears any existing PPP username and PPP password for an

existing cellular connection.

sound <command> <argument> Low level sound conguration. Can be used to play/record audio

samples and enable beam forming on Pixel. sound beamforming

<on|o > will enable/disable the feature. sound record [duration]

will start recording. sound play <lename> plays the recorded audio

samples

storage_status Reads storage device SMART health status, vendor attributes, and

error logs.

storage_test_1 Performs a short oine SMART test.

62 Diagnostic and troubleshooting

Command Purpose

storage_test_2 Performs an extensive readability test.

syslog <message> Logs a message to system log.

tpcontrol{status | taptoclick [on|o] sensitivity [1-5] | set

<property>< value>} tpcontrol {syntp [on|o]}

Allows the user to manually adjust advanced touchpad settings.

tracepath [-n] <destination>[/port] Traces the path/route to a network host.

update_over_cellular [enable|disable] Enables or disables the auto updates over cellular networks. Run

without arguments to see the current state.

upload crashes Uploads available crash reports to the crash server.

wpa_debug [<debug_level>] [--help] [--list_valid_level] [--reset] Sets the wpa_supplicant debugging level.

xset m [acc_mult[/acc_div] [thr]] xset m default Tweaks the mouse acceleration rate.

xset r rate [delay [rate]] Tweaks the autorepeat rates. The delay is the number of

milliseconds before autorepeat starts. The rate is the number of

repeats per second.

xset r [keycode] < on|o > Turns autorepeat on/o. If a keycode is specied, it aects only

that key. If not specied, it aects global behavior.

Chrome commands

Chrome:// pages contain experimental features, diagnostic tools, and detailed statistics. They are hidden in Chrome's user interface.

Chrome://about page lists all Chrome's internal pages. To view all the commands, type chrome://about in the Chrome browser URL as

shown below:

Table 16. Chrome browser shortcuts

Purpose Browser Shortcut Explanation

System Information chrome://system/ "Who am I".. BIOS version, and so on

Basic Connectivity Diags chrome://diagnostics/ Test for NIC and Internet connection

Chrome Information chrome://version More "Who am I" type of stu

Create Recovery USB Stick chrome://imageburner/ Google's version of DBAR/DBRM

Chrome Flags chrome://ags Experimental features beyond the scope of

what Dell supports

Diagnostic and troubleshooting 63

Purpose Browser Shortcut Explanation

Memory Troubleshooting chrome://memory View running processes and memory

utilization

Module Load chrome://conicts Shows conicts of all modules loaded by

Chrome

Chrome Sync Status chrome://syncchrome://sync-internals Allows troubleshooting of connected

accounts

Connectivity Troubleshooting chrome://net-internals Comprehensive network/connectivity

diagnostics, including DNS analysis, Waterfall

and Bandwidth diagnostics, and so on

Histogram chrome://histograms Actual work and I/O audit

Credits chrome://credits References to all module/libs contributions

and their respective wiki/license URLs

Crash Reporting chrome://crashes Shows detailed crash report, if the feature

was enabled

Apps RAM Utilization chrome://appcache-internals Detailed memory usage for apps/extensions,

especially handy for 2 GB Chromebooks

Following are the 12 most helpful chrome:// commands that you should know:

64 Diagnostic and troubleshooting

Table 17. Helpful chrome commands

Chrome Commands Purpose Screenshot

chrome://ags From here you can enable some of the

experimental features that are hidden in the

Google Chrome browser. Please note that as

mentioned on this page, since these are

experimental, these might not work as

expected and might cause issues. Enable

these features, and use it at your own risk.

chrome://dns This displays the list of hostnames for which

the browser will prefetch the DNS records.

Diagnostic and troubleshooting 65

Chrome Commands Purpose Screenshot

chrome://downloads This is also available from the Menu >

Downloads. Shortcut key is Ctrl+J.

chrome://extensions This is also available from the Menu > Tools

> Extensions.

chrome://bookmarks This is also available from the Menu >

Bookmarks > Bookmark Manager. Short cut

key is Ctrl+Shift+O.

66 Diagnostic and troubleshooting

Chrome Commands Purpose Screenshot

chrome://history This is also available from the Menu >

History. Short cut key is Ctrl+H.

chrome://memory This will redirect to “chrome://memory-

redirect/”. This will display the memory used

by the Google Chrome browser. This also

displays all the process related to browser

with their PID, process name, and the

memory it takes.

chrome://net-internals This displays all networking related

information. Use this to capture network

events generated by the browser. You can

also export this data. You can view DNS

host resolver cache. One of the important

features in this feature is “Test”. If a URL

failed to load, you can go to “chrome://net-

internals” > click on “Tests” tab > type that

URL which failed, and click on “Start Test”,

which does some test and report you why

that URL failed. chrome://plugins/.

Diagnostic and troubleshooting 67

Chrome Commands Purpose Screenshot

chrome://quota-internals This gives information about the disk space

quote used by the browser, including the

breakdown of how much space the

individual websites took under temporary

les.

chrome://sessions This displays the number of sessions and

magic list that are currently running.

chrome://settings This is also available from the Menu >

Options (on Windows), and Menu >

Preferences (on Linux). From here you can

control various browser related settings.

68 Diagnostic and troubleshooting

Chrome Commands Purpose Screenshot

chrome://sync-internals This gives information about the Chrome

sync feature, including the Sync URL used

by Google, and sync statistics.

Commonly used CROSH command

This page contains information about the most commonly used CROSH commands to diagnose the Dell .

Below are some of the most commonly used CROSH commands to troubleshoot a hardware issue.

NOTE: CROSH storage_test_1 and storage_test_2 are not supported on the eMMC storage device.

Check battery charging status

The Chrome Shell (CROSH) includes a simple battery health diagnostic test. This is to conrm that the battery is charging and to check on

the battery health and discharge rate. Follow the instruction provided to check on the battery charging status:

1 Connect the AC adapter to the Chromebook and a power outlet.

2 Turn on, and sign in to the Chromebook.

3 Open the Chrome browser.

4 Press CTRL + ALT + T to open CROSH.

Diagnostic and troubleshooting 69

5 Type battery_test 1 into CROSH, and then press Enter.

6 Check the result to conrm that the battery is charging.

Check battery health

Follow the steps to evaluate the health of the Chromebook battery, and check the discharge rate:

1 Disconnect the AC adapter from the Chromebook.

2 Turn on and sign in to Chromebook.

3 Open the Chrome browser.

70 Diagnostic and troubleshooting

4 Press CTRL + ALT + T to open CROSH.

5 Type battery_test 1 into CROSH, and then press Enter.

6 A screen displays the current battery health and discharge rate.

• If the Battery health percentage is greater than 50%, the battery is within the expected wear limits.

• If the Battery health percentage is equal to or less than 50% and the battery is less than a year old, the battery is outside expected

wear limits and might need to be replaced.

Diagnostic and troubleshooting 71

• If the test results show that Battery is Unknown, the battery might need to be replaced.

Checking memory

Follow the steps below to perform a memory check for Chromebook:

NOTE: This will approximately take 20 minutes to complete the test, and it also depends on the capacity of the memory.

1 Turn on and sign in to Chromebook.

2 Open the Chrome browser.

3 Press CTRL + ALT + T to open CROSH.

4 Type memory_test into CROSH, and then press Enter.

72 Diagnostic and troubleshooting

5 A diagnostic screen displays the result of the memory test passed without any errors.

Example of a memory test failure.

Diagnostic and troubleshooting 73

Checking network status

If you are having trouble connecting to the Internet, use the steps in one or more of the following sections to test the network adapter:

Follow the instruction to gather the information about the network and diagnose the network errors.

1 Turn on and sign in to Chromebook.

2 Open the Chrome browser.

3 Press CTRL + ALT + T to open CROSH.

4 Type network_diag into CROSH, and then press Enter.

74 Diagnostic and troubleshooting

5 Wait while CROSH performs a set of network diagnostic tests. A diagnostic screen displays the results of the network adapter health

test.

6 The diagnostic test log is saved as a.txt (plain text) le in the Files app.

Diagnostic and troubleshooting 75

7 If the diagnostic test returns a failure message, make sure the Wi-Fi adapter is enabled and connect to a network.

Reset Chromebook

This page contains all information about resetting Dell .

All local user data stored on the Chromebook can be cleared by resetting it to its original factory state (also known as Powerwash).

This step might be helpful if you want to reset owner permissions or if you are experiencing issues with your user prole.

NOTE: All data stored on your Chromebook such as downloaded les, photos, owner permissions, and saved networks, will be

deleted for all accounts when performing a factory reset. After clearing this data, you will be guided through the initial setup

again. Resetting your device will not aect your accounts themselves, or any data synced to these accounts.

NOTE: Do not follow the instructions below if you're using a managed Chrome device, as you will not be able to re-enroll your

device after powerwashing it.

Follow these steps to reset your Chromebook to its original factory state:

76 Diagnostic and troubleshooting

1 Click the status area in the lower-right corner, where your account picture appears.

Diagnostic and troubleshooting 77

2 Click Settings as highlighted from the screenshot below.

78 Diagnostic and troubleshooting

3 Click Show advanced settings to expand the menu.

Diagnostic and troubleshooting 79

4 Click the Powerwash button.

80 Diagnostic and troubleshooting

5 Click Restart when prompted.

You can also reset your Chromebook from the sign-in screen by holding down the keys Ctrl+Alt+Shift+R and clicking Restart. (If you

are signed in to your Chromebook, sign out rst before you press on Ctrl+Alt+Shift+R, then click Restart. Once the Chromebook is

restarted, click Reset.)

After you restart the Chromebook, you should now see the setup screen. Follow the instructions on the screen to set up your Chromebook

again. Make sure you sign in with your primary Google Account, because this account is set as the owner account.

Recovery Chromebook

This page contains information about recovering Dell .

Recovering the Chromebook

Install a new version of the Chrome operating system on your Chromebook by going through the recovery process. You may want to go

through this process if you are having problems updating your Chromebook or if it stops working.

Diagnostic and troubleshooting 81

NOTE: All account information and data stored on your Chromebook, such as photos, downloaded les, and saved networks, will

be deleted. Owner privileges for your primary account will also be reset. However, the actual Google Accounts and any data

synced to these accounts are not aected by the recovery process. After the recovery process is complete, you will be guided

through the initial setup again.

Prerequisites:

Before starting this process, you need the following:

• A Chrome device, Windows, Mac, or the Linux computer with administrative rights.

• A 4 GB or larger USB ash drive or SD card that you do not mind clearing.

Step 1- Check for the Chrome OS is missing or damaged message

If you see this message, you can rst try to perform a hard reset on your Chromebook by pressing Refresh + Power. If you still see this

message after performing a hard reset, please proceed to Step 2.

If you see the Chrome OS verication is turned o message, refer to Chrome OS verication is turned o section below.

Step 2- Create the recovery USB ash drive or SD card

Insert a USB ash drive or SD card into your computer and follow the instructions below

Table 18. USB ash drive or SD card

Operating System Instructions

Chrome Device Instructions

Create a recovery ash drive by using the Image Burner. The tool

may not be available in all languages.

1 Type chrome://imageburner into the omnibox (browser's

address bar) .

2 Run the tool and follow the instructions that appear on your

screen.

NOTE: When recovering your Chromebook, make sure to

create the recovery ash drive on the same model.

Windows Instructions

1 Click this link to download the Recovery Tool. If you are a

network administrator for your school, business, or

organization, click this link to download the Recovery Tool: 2.

2 Run the tool and follow the instructions that appear on your

screen.

3 After you recover your Chromebook, you must format your

USB ash drive or SD card using the Recovery Tool. If you do

not format your USB ash drive or SD card, you will not be

able to use all the storage space on your external device.

Additionally, your USB ash drive or SD card may not be

recognizable by Windows.

Mac Instructions

Create a recovery ash drive by using the Recovery Tool. The tool

may not be available in all languages.

1 Click this link to download the Recovery Tool.

2 Run the tool and follow the instructions that appear on your

screen.

After the process is complete, you might see an alert saying your

USB drive or SD card is unreadable. If this fails, try removing and

82 Diagnostic and troubleshooting

Operating System Instructions

reinserting your USB drive or SD card. Your USB drive or SD card

should now be ready to use for recovery.

Linux Instructions

Create a recovery ash drive by using the Recovery Tool. The tool

may not be available in all languages.

1 1.Click this link to download the Recovery Tool.

2 Modify the script permissions to allow execution with the

following command: $ & sudo chmod 755 linux_recovery.sh

3 Run the script with root privileges with the following

command:$ sudo bash linux_recovery.sh

4 Follow the prompts from the tool to complete building the

operating system image.

Reinstall the Chrome Operating System

1 Start your Chromebook.

2 When the Chrome OS is missing or damaged screen appears, insert the USB ash drive or SD card you created into the USB port or

SD card slot on your Chrome device

3 Wait for the Chromebook to boot up from the ash drive

4 Follow the instructions that appear on the screen.

5 On successful installation of the Chrome operating system, you will be prompted to remove the USB ash drive or SD card.

6 Remove the USB ash drive or SD card when prompted, and your Chromebook will automatically restart.

You should now be able to start your Chromebook as normal. Because the data stored on your Chromebook has been cleared, you will need

to go through the initial setup again. Make sure you sign in with your primary Google Account, because this account will be set as the

owner account.

Chrome OS verication is turned o Message

By default, Chromebooks are set to the normal user mode. If you've set the user mode to developer mode instead, you'll see a screen with

the message "Chrome OS verication is turned o" when you start up. Use the developer mode if you want to test your own version of the

Chrome operating system.

Press Ctrl+D to enter developer mode. If you press the space bar instead, you'll see a screen asking to recover your device.

Troubleshooting Tips

Table 19. Troubleshooting tips

Question Solution

I am unable to recover my Chromebook To help ensure that you are running the latest version of Chrome

OS once you recover your Chromebook, we recommend creating

the recovery media with the latest version of Chrome OS and avoid

using recovery media that may contain an older version of the

operating system.

An error message An unexpected error has occurred. Try the following steps:

1Conrm that you successfully completed all instructions

exactly as specied in Step 2: Create the recovery USB ash

drive or SD card above.

2 Try using a dierent USB stick or SD card.

Diagnostic and troubleshooting 83

Question Solution

3 If the problem persists, contact Google Chrome support team.

An error message You are using an out-of-date Chrome OS

recovery image.

You should download an up-to date recovery image. Simply follow all

the instructions exactly as specied in Step 2 above.

You successfully recovered your Chromebook but now you can not

use your USB or SD card with Windows

After you have completed recovery, you need to format your USB

or SD card using the recovery tool.

You successfully recovered your Chromebook but now Windows

does not recognize the whole size of the USB or SD card used for

recover.

After you have completed recovery, you need to format your USB

or SD card using the recovery tool.

84 Diagnostic and troubleshooting

Contacting Dell

NOTE: If you do not have an active Internet connection, you can nd contact information on your purchase invoice, packing slip,

bill, or Dell product catalog.

Dell provides several online and telephone-based support and service options. Availability varies by country and product, and some services

may not be available in your area. To contact Dell for sales, technical support, or customer service issues:

1 Go to Dell.com/support.

2 Select your support category.

3 Verify your country or region in the Choose a Country/Region drop-down list at the bottom of the page.

4 Select the appropriate service or support link based on your need.

Contacting Dell 85

Table of Contents

DELL 5190 User Manual

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