Dell Chromebook 3189 Service manual
Chromebook 11 3189
Disassembly and Reassembly Guide - For use by Dell
Certied Technicians only
Regulatory Model: P26T
Regulatory Type: P26T001
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.
© 2017 Dell Inc. or its subsidiaries. All rights reserved. Dell, EMC, and other trademarks are trademarks of Dell Inc. or its subsidiaries. Other trademarks
may be trademarks of their respective owners.
2017 - 02
Rev. A00
Contents
1 Working on your computer............................................................................................................................. 5
Safety instructions.............................................................................................................................................................5
Before working inside your computer..............................................................................................................................5
After working inside your computer.................................................................................................................................6
2 Removing and installing components............................................................................................................. 7
Recommended tools.......................................................................................................................................................... 7
microSD card.......................................................................................................................................................................7
Removing microSD card..............................................................................................................................................7
Installing microSD card................................................................................................................................................ 7
Base cover...........................................................................................................................................................................7
Removing base cover.................................................................................................................................................. 7
Installing base cover.....................................................................................................................................................9
Battery.................................................................................................................................................................................9
Removing battery.........................................................................................................................................................9
Installing battery..........................................................................................................................................................10
Keyboard............................................................................................................................................................................10
Removing keyboard....................................................................................................................................................10
Installing keyboard...................................................................................................................................................... 13
Power switch board..........................................................................................................................................................14
Removing power switch board..................................................................................................................................14
Installing power switch board....................................................................................................................................15
Audio board....................................................................................................................................................................... 15
Removing audio board................................................................................................................................................15
Installing audio board..................................................................................................................................................16
Power connector port......................................................................................................................................................16
Removing power connector port..............................................................................................................................16
Installing power connector port................................................................................................................................ 17
Speaker.............................................................................................................................................................................. 18
Removing speaker...................................................................................................................................................... 18
Installing speakers.......................................................................................................................................................19
Touchpad panel.................................................................................................................................................................19
Removing touchpad................................................................................................................................................... 19
Installing touchpad.....................................................................................................................................................22
Display assembly.............................................................................................................................................................. 22
Removing display assembly...................................................................................................................................... 22
Installing display assembly.........................................................................................................................................25
Display back cover...........................................................................................................................................................25
Removing display back cover...................................................................................................................................26
Installing display back cover......................................................................................................................................27
System board....................................................................................................................................................................27
Removing system board............................................................................................................................................27
Installing system board..............................................................................................................................................30
Contents
3
Palm rest............................................................................................................................................................................31
Replacing palm rest.................................................................................................................................................... 31
3 Product specication...................................................................................................................................33
4 Software......................................................................................................................................................35
Operating system.............................................................................................................................................................35
Chrome OS.................................................................................................................................................................35
Veried Boot...............................................................................................................................................................36
Disk Partition Map......................................................................................................................................................37
Developer and Recovery mode................................................................................................................................38
Coreboot + U-boot Custom Firmware....................................................................................................................38
Chrome vs Chromium OS.........................................................................................................................................39
View system information.................................................................................................................................................39
Dell activity light...............................................................................................................................................................42
Overview.....................................................................................................................................................................42
Raise your Hand/Answer Question/Discussion buttons.......................................................................................43
MultiColor Poll ........................................................................................................................................................... 44
5 Technology and components....................................................................................................................... 45
Keyboard........................................................................................................................................................................... 45
Keyboard keys function.............................................................................................................................................45
Touchpad...........................................................................................................................................................................47
Integrated microphone.................................................................................................................................................... 48
Key features................................................................................................................................................................48
Typical applications.................................................................................................................................................... 48
Bluetooth...........................................................................................................................................................................48
6 Diagnostic and troubleshooting................................................................................................................... 50
Basic troubleshooting......................................................................................................................................................50
Power issues...............................................................................................................................................................50
CROSH..............................................................................................................................................................................54
CROSH commands......................................................................................................................................................... 55
Chrome commands..........................................................................................................................................................57
Commonly used CROSH command.............................................................................................................................. 63
Check battery charging status.................................................................................................................................63
Reset Chromebook..........................................................................................................................................................70
Recovery Chromebook....................................................................................................................................................75
Recovering the Chromebook....................................................................................................................................75
7 Contacting Dell............................................................................................................................................ 79
Contents
4
Working on your computer
Safety instructions
Use the following safety guidelines to protect your computer from potential damage and to ensure your personal safety. Unless otherwise
noted, each procedure included in this document assumes that the following conditions exist:
• You have read the safety information that shipped with your computer.
• A component can be replaced or, if purchased separately, installed by performing the removal procedure in reverse order.
WARNING: Disconnect all power sources before opening the computer cover or panels. After you nish working inside the
computer, replace all covers, panels, and screws before connecting to the power source.
WARNING: Before working inside your computer, read the safety information that shipped with your computer. For additional
safety best practices information, see the Regulatory Compliance Homepage at www.dell.com/regulatory_compliance
CAUTION: Many repairs may only be done by a certied service technician. You should only perform troubleshooting and simple
repairs as authorized in your product documentation, or as directed by the online or telephone service and support team. Damage
due to servicing that is not authorized by Dell is not covered by your warranty. Read and follow the safety instructions that came
with the product.
1
CAUTION: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching an
unpainted metal surface, such as a connector on the back of the computer.
CAUTION: Handle components and cards with care. Do not touch the components or contacts on a card. Hold a card by its
edges or by its metal mounting bracket. Hold a component such as a processor by its edges, not by its pins.
CAUTION: When you disconnect a cable, pull on its connector or on its pull-tab, not on the cable itself. Some cables have
connectors with locking tabs; if you are disconnecting this type of cable, press in on the locking tabs before you disconnect the
cable. As you pull connectors apart, keep them evenly aligned to avoid bending any connector pins. Also, before you connect a
cable, ensure that both connectors are correctly oriented and aligned.
NOTE: The color of your computer and certain components may appear dierently than shown in this document.
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.
CAUTION
the network device.
4 Disconnect all network cables from the computer.
5 Disconnect your computer and all attached devices from their electrical outlets.
6 Close the display and turn the computer upside-down on a at work surface.
: To disconnect a network cable, rst unplug the cable from your computer and then unplug the cable from
: To avoid damaging the system board, you must remove the main battery before you service the computer.
NOTE
7 Remove the base cover.
8 Remove the main battery.
9 Turn the computer top-side up.
10 Open the display.
Working on your computer 5
11 Press and hold the power button for few seconds, to ground the system board.
CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the
display.
CAUTION: Before touching anything inside your computer, ground yourself by touching an unpainted metal surface,
such as the metal at the back of the computer. While you work, periodically touch an unpainted metal surface to
dissipate static electricity, which could harm internal components.
12 Remove any installed ExpressCards or Smart Cards from the appropriate slots.
After working inside your computer
After you complete any replacement procedure, ensure you connect any external devices, cards, and cables before turning on your
computer.
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.
6
Working on your computer
Removing and installing components
This section provides detailed information on how to remove or install the components from your computer.
Recommended tools
The procedures in this document require the following tools:
• Phillips #0 screwdriver
• Phillips #1 screwdriver
• Plastic scribe
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.
2
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 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 mylar cap [1].
: The screw cover on the base cover is made up of a mylar sticker. To remove this screw, use a regular
NOTE
philips driver and puncture the mylar cover. Once the mylar caps are removed it cannot replaced, and the
screws will be exposed from that point forward.
b Loosen the M2.5x7 captive screws that secure the base cover to the computer [2] .
Removing and installing components 7
c Pry the base cover from the edge.
NOTE
: You may need a 3c plastic scribe to pry the base cover from the edge.
4 Lift the base cover away from the computer.
8
Removing and installing components
Installing 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 screws to secure the base cover to the computer.
4 Install the microSD card
5 Follow the procedure in After working inside your computer.
Battery
Removing battery
1 Follow the procedure in Before working inside your computer.
2 Remove the:
a microSD card
b base cover
3 To remove the battery:
a Disconnect the battery cable from the connector on the system board [1].
b Remove the M2.0x3.0 screws that secure the battery to the computer [2].
c Lift the battery away from the computer [3].
Removing and installing components
9
Installing battery
1 Insert the battery into the slot on the computer.
2 Connect the battery cable to the connector on the battery.
3 Replace the M2.0x3.0 screws to secure the battery to the computer.
4 Install the:
a base cover
b microSD card
5 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:
a microSD card
b base cover
c battery
3 To remove keyboard:
a Disconnect the keyboard cable from the system board [1].
b Use the plastic scribe to the release the keyboard [2].
10
Removing and installing components
NOTE: The two release holes for the keyboard are indicated by the "KB" labeling.
4 Slide the keyboard outwards, away from the computer.
Removing and installing components
11
NOTE: Carefully pull the keyboard connector through the gap in the palm rest.
5 Lift the keyboard away from the computer.
12
Removing and installing components
Installing keyboard
1 Align the keyboard trim with the tabs on the computer, and press it until it clicks into place.
2 Connect the keyboard cable on the system board.
Removing and installing components
13
3 Install the:
a battery
b base cover
c microSD card
4 Follow the procedure in After working inside your computer.
Power switch board
Removing power switch board
1 Follow the procedure in Before working inside your computer.
2 Remove the:
a microSD card
b base cover
c battery
3 To remove the power switch:
a Disconnect the power switch cable from the power switch board [1].
b Remove the M.2.0x3.0 screws that secure the power switch board on the computer [2].
c Lift the power switch board away from the computer [3].
14 Removing and installing components
Installing power switch board
1 Align the screw hole on the power switch board into the slot on the computer.
2 Replace the M2.0x3.0 screws that secure the power switch board to the computer.
3 Connect the power switch cable to the connector on the power switch board.
4 Install the:
a battery
b base cover
c microSD card
5 Follow the procedure in After working inside your computer.
Audio board
Removing audio board
1 Follow the procedure in Before working inside your computer.
2 Remove the:
a microSD card
b base cover
c battery
3 To remove the audio board:
a Disconnect the audio cable from the connector on the audio board [1].
b Remove the M.2.0x3.0 screw that secures the audio board on the computer [2].
c Lift the audio board away from the computer [3].
Removing and installing components
15
Installing audio board
1 Insert the audio board into the slot on the computer.
2 Replace the M2.0x3.0 screw that secure the audio board to the computer.
3 Connect the audio cable to the connector on the audio board.
4 Install the:
a battery
b base cover
c microSD card
5 Follow the procedure in After working inside your computer.
Power connector port
Removing power connector port
1 Follow the procedure in Before working inside your computer.
2 Remove the:
a microSD card
b base cover
c battery
16
Removing and installing components
3 To remove the power connector port:
a Disconnect the power connector cable from the connector on the system board [1].
b Remove the M.2.0x3.0 screws that secure the power connector port on the computer [2].
c Slide and lift the power connector port away from the computer [3].
Installing power connector port
1 Insert the power connector port into the slot on the computer.
2 Replace the M2.0x3.0 screw that secures the power connector port to the computer.
3 Connect the power connector cable to the connector on the system board.
4 Install the:
a battery
b base cover
c microSD card
5 Follow the procedure in After working inside your computer.
Removing and installing components
17
Speaker
Removing speaker
1 Follow the procedure in Before working inside your computer.
2 Remove the:
a microSD card
b base cover
c battery
3 To remove the speaker:
a Disconnect the speaker cable from the connector on the system board [1].
b Remove the adhesive tape that secures the speaker cable on the computer .
c Unroute the speaker cable from the routing channel [3].
4 Remove the speaker from the computer.
18
Removing and installing components
Installing speakers
1 Place the speakers into the slots on the computer.
2 Route the speaker cable through the retention clips through routing channel.
3 Ax the adhesive tape to secure the speaker cable on the computer.
4 Connect the speaker cable to the connector on the system board.
5 Install the:
a battery
b base cover
c microSD card
6 Follow the procedure in After working inside your computer.
Touchpad panel
Removing touchpad
1 Follow the procedure in Before working inside your computer.
2 Remove the:
a microSD card
b base cover
c battery
d speaker
3 To remove touchpad cable:
a Lift the latch, and disconnect the touchpad cable from the computer [1].
b Remove the touchpad cable [2].
Removing and installing components
19
4 Remove the screws (M2.0x3.0, M.2.0x2.0) that secure the metal bracket to the touchpad on the computer.
NOTE
: Remove the adhesive tape that secures the speaker cable on the metal bracket.
5 To remove metal bracket:
a Remove the adhesive tape [1, 2].
b Lift the metal bracket [3].
20
Removing and installing components
6 Remove the touchpad from the computer.
Removing and installing components
21
Installing touchpad
1 Place the touchpad into the slots on the computer.
2 Place the metal bracket, and ax the adhesive tape.
3 Replace the screws (M2.0x3.0, M.2.0x2.0) that secure the metal bracket on the computer.
NOTE: Ax the adhesive tape that secures the speaker cable on the metal bracket.
Connect the touchpad cable.
4
5 Ax the adhesive tape to secure the speaker cable on the computer.
6 Connect the speaker cable to the connector on the system board.
7 Install the:
a speaker
b battery
c base cover
d microSD card
8 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:
a microSD card
b base cover
c battery
3 To remove cables:
a Remove the screw M2.0x3.0 and lift the metal bracket that secures the WLAN card on the system board [1, 2]
b Disconnect the WLAN cables [3].
c Remove the screws M2.0x.30 and lift the metal bracket that secures the display cable on the computer [4, 5]
d Lift the latch, and disconnect the cable [6]
22
Removing and installing components
4 Disconnect the sensor cable, and turn over the computer [1, 2]
Removing and installing components
23
5 To remove display assembly:
a Remove the display hinge screws M2.0xM5.0 that secure the display assembly to the computer [1].
b Lift the display assembly away from the computer [2].
24
Removing and installing components
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