Table of Contents
- About this documentation
- Chapter 1. Safety information
- Chapter 2. General checkout
- Chapter 3. Create and use a USB repair shim
- Chapter 4. Identifying FRUs (CRUs)
- Chapter 5. Removing a FRU or CRU
- General guidelines
- Cut off the power supply from the built-in battery pack
- Remove the lower case
- Remove the battery pack
- Remove the Wi-Fi card
- Remove the I/O board
- Remove the speakers
- Remove the system board
- Remove the upper case (with keyboard)
- Remove the touchpad assembly
- Disassemble the LCD module
- Appendix A. Features and connectors
- Appendix B. Label locations
- Trademarks
Lenovo 14e User Manual
Displayed below is the user manual for 14e by Lenovo which is a product in the Notebooks category. This manual has pages.
Related Manuals
Hardware Maintenance Manual
Lenovo 14e Chromebook
First Edition (Feburary 2019)
© Copyright Lenovo 2019.
LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is delivered pursuant to a General Services
Administration “GSA” contract, use, reproduction, or disclosure is subject to restrictions set forth in Contract No. GS-
35F-05925.
Contents
About this documentation . . . . . . . . v
Chapter 1. Safety information . . . . . . 1
General safety . . . . . . . . . . . . . . . . 1
Electrical safety . . . . . . . . . . . . . . . . 1
Safety inspection guide . . . . . . . . . . . . . 2
Handling devices that are sensitive to electrostatic
discharge . . . . . . . . . . . . . . . . . . 3
Grounding requirements . . . . . . . . . . . . 4
Safety notices (multilingual translations) . . . . . . 4
Chapter 2. General checkout . . . . . 21
What to do first . . . . . . . . . . . . . . . 21
Checking the ac power adapter . . . . . . . . 22
CRU list . . . . . . . . . . . . . . . . . . 23
Chapter 3. Create and use a USB
repair shim . . . . . . . . . . . . . . . 25
What is a USB repair shim? . . . . . . . . . . 25
Create a repair shim . . . . . . . . . . . . . 25
Use a USB repair shim to diagnose and fix
problems . . . . . . . . . . . . . . . . . 25
Factory test items . . . . . . . . . . . . 26
Chapter 4. Identifying FRUs
(CRUs) . . . . . . . . . . . . . . . . . 29
Locating FRUs and CRUs . . . . . . . . . . . 29
Major FRUs and CRUs . . . . . . . . . . 30
LCD FRUs and CRUs . . . . . . . . . . . 32
Miscellaneous parts . . . . . . . . . . . 33
Looking up the FRU information . . . . . . . . 33
Chapter 5. Removing a FRU or
CRU . . . . . . . . . . . . . . . . . . 35
General guidelines. . . . . . . . . . . . . . 35
Cut off the power supply from the built-in battery
pack . . . . . . . . . . . . . . . . . . . 35
Remove the lower case . . . . . . . . . . . . 36
Remove the battery pack . . . . . . . . . . . 37
Remove the Wi-Fi card . . . . . . . . . . . . 38
Remove the I/O board . . . . . . . . . . . . 40
Remove the speakers . . . . . . . . . . . . 42
Remove the system board. . . . . . . . . . . 44
Remove the upper case (with keyboard) . . . . . 47
Remove the touchpad assembly . . . . . . . . 48
Disassemble the LCD module . . . . . . . . . 51
Remove the LCD panel . . . . . . . . . . 51
Remove the camera board. . . . . . . . . 54
Appendix A. Features and
connectors . . . . . . . . . . . . . . . 57
Appendix B. Label locations . . . . . 59
Trademarks . . . . . . . . . . . . . . . . . lxi
© Copyright Lenovo 2019 iii
iv Hardware Maintenance Manual
About this documentation
• Illustrations in this documentation might look different from your product.
• Depending on the model, some optional accessories, features, and software programs might not be
available on your computer.
• Depending on the version of operating systems, some user interface instructions might not be applicable
to your computer.
• Documentation content is subject to change without notice. Lenovo makes constant improvements on the
documentation of your computer, including this Hardware Maintenance Manual. To get the latest
documentation, go to https://support.lenovo.com.
• This documentation applies to the following product models.
Model name Machine type
Lenovo 14e Chromebook 81MH
© Copyright Lenovo 2019 v
vi Hardware Maintenance Manual
Chapter 1. Safety information
This chapter presents the following safety information that you need to be familiar with before you service a
Lenovo notebook computer.
General safety
Follow these rules to ensure general safety:
• Observe good housekeeping in the area of the machines during and after maintenance.
• When lifting any heavy object:
1. Make sure that you can stand safely without slipping.
2. Distribute the weight of the object equally between your feet.
3. Use a slow lifting force. Never move suddenly or twist when you attempt to lift.
4. Lift by standing or by pushing up with your leg muscles; this action removes the strain from the
muscles in your back. Do not attempt to lift any object that weighs more than 16 kg (35 lb) or that you
think is too heavy for you.
• Do not perform any action that causes hazards to the customer, or that makes the equipment unsafe.
• Before you start the machine, make sure that other service technicians and the customer's personnel are
not in a hazardous position.
• Place removed covers and other parts in a safe place, away from all personnel, while you are servicing the
machine.
• Keep your tool case away from walk areas so that other people will not trip over it.
• Do not wear loose clothing that can be trapped in the moving parts of a machine. Make sure that your
sleeves are fastened or rolled up above your elbows. If your hair is long, fasten it.
• Insert the ends of your necktie or scarf inside clothing or fasten it with a non-conductive clip, about 8
centimeters (3 inches) from the end.
• Do not wear jewelry, chains, metal-frame eyeglasses, or metal fasteners for your clothing.
Attention: Metal objects are good electrical conductors.
• Wear safety glasses when you are hammering, drilling, soldering, cutting wire, attaching springs, using
solvents, or working in any other conditions that might be hazardous to your eyes.
• After service, reinstall all safety shields, guards, labels, and ground wires. Replace any safety device that
is worn or defective.
• Reinstall all covers correctly before returning the machine to the customer.
• Fan louvers on the machine help to prevent overheating of internal components. Do not obstruct fan
louvers or cover them with labels or stickers.
Electrical safety
Observe the following rules when working on electrical equipment.
Important: Use only approved tools and test equipment. Some hand tools have handles covered with a soft
material that does not insulate you when working with live electrical currents. Many customers have, near
their equipment, rubber floor mats that contain small conductive fibers to decrease electrostatic discharges.
Do not use this type of mat to protect yourself from electrical shock.
• Find the room emergency power-off (EPO) switch, disconnecting switch, or electrical outlet. If an electrical
accident occurs, you can then operate the switch or unplug the power cord quickly.
• Do not work alone under hazardous conditions or near equipment that has hazardous voltages.
• Disconnect all power before:
– Performing a mechanical inspection
– Working near power supplies
© Copyright Lenovo 2019 1
– Removing or installing main units
• Before you start to work on the machine, unplug the power cord. If you cannot unplug it, ask the customer
to power-off the wall box that supplies power to the machine, and to lock the wall box in the off position.
• If you need to work on a machine that has exposed electrical circuits, observe the following precautions:
– Ensure that another person, familiar with the power-off controls, is near you.
Attention: Another person must be there to switch off the power, if necessary.
– Use only one hand when working with powered-on electrical equipment; keep the other hand in your
pocket or behind your back.
Attention: An electrical shock can occur only when there is a complete circuit. By observing the above
rule, you may prevent a current from passing through your body.
– When using testers, set the controls correctly and use the approved probe leads and accessories for
that tester.
– Stand on suitable rubber mats (obtained locally, if necessary) to insulate you from grounds such as
metal floor strips and machine frames.
Observe the special safety precautions when you work with very high voltages; Instructions for these
precautions are in the safety sections of maintenance information. Use extreme care when measuring high
voltages.
• Regularly inspect and maintain your electrical hand tools for safe operational condition.
• Do not use worn or broken tools and testers.
• Never assume that power has been disconnected from a circuit. First, check that it has been powered off.
• Always look carefully for possible hazards in your work area. Examples of these hazards are moist floors,
non-grounded power extension cables, power surges, and missing safety grounds.
• Do not touch live electrical circuits with the reflective surface of a plastic dental mirror. The surface is
conductive; such touching can cause personal injury and machine damage.
• Do not service the following parts with the power on when they are removed from their normal operating
places in a machine:
– Power supply units
– Pumps
– Blowers and fans
– Motor generators
– Similar units as listed above
This practice ensures correct grounding of the units.
• If an electrical accident occurs:
– Use caution; do not become a victim yourself.
– Switch off power.
– Send another person to get medical aid.
Safety inspection guide
The purpose of this inspection guide is to assist you in identifying potentially unsafe conditions. As each
machine was designed and built, required safety items were installed to protect users and service
technicians from injury. This guide addresses only those items. You should use good judgment to identify
potential safety hazards due to attachment of non-Lenovo features or options not covered by this inspection
guide.
If any unsafe conditions are present, you must determine how serious the apparent hazard could be and
whether you can continue without first correcting the problem.
Consider these conditions and the safety hazards they present:
• Electrical hazards, especially primary power (primary voltage on the frame can cause serious or fatal
electrical shock)
• Explosive hazards, such as a damaged cathode ray tube (CRT) face or a bulging capacitor
2Hardware Maintenance Manual
• Mechanical hazards, such as loose or missing hardware
To determine whether there are any potentially unsafe conditions, use the following checklist at the
beginning of every service task. Begin the checks with the power off, and the power cord disconnected.
Checklist:
1. Check exterior covers for damage (loose, broken, or sharp edges).
2. Power off the computer. Disconnect the power cord.
3. Check the power cord for:
a. A third-wire ground connector in good condition. Use a meter to measure third-wire ground
continuity for 0.1 ohm or less between the external ground pin and the frame ground.
b. The power cord should be the authorized type specified for your computer. Go to: http://
www.lenovo.com/serviceparts-lookup
c. Insulation must not be frayed or worn.
4. Check for cracked or bulging batteries.
5. Remove the cover.
6. Check for any obvious non-Lenovo alterations. Use good judgment as to the safety of any non-Lenovo
alterations.
7. Check inside the unit for any obvious unsafe conditions, such as metal filings, contamination, water or
other liquids, or signs of fire or smoke damage.
8. Check for worn, frayed, or pinched cables.
9. Check that the power-supply cover fasteners (screws or rivets) have not been removed or tampered
with.
Handling devices that are sensitive to electrostatic discharge
Any computer part containing transistors or integrated circuits (ICs) should be considered sensitive to
electrostatic discharge (ESD). ESD damage can occur when there is a difference in charge between objects.
Protect against ESD damage by equalizing the charge so that the machine, the part, the work mat, and the
person handling the part are all at the same charge.
Notes:
1. Use product-specific ESD procedures when they exceed the requirements noted here.
2. Make sure that the ESD protective devices you use have been certified (ISO 9000) as fully effective.
When handling ESD-sensitive parts:
• Keep the parts in protective packages until they are inserted into the product.
• Avoid contact with other people.
• Wear a grounded wrist strap against your skin to eliminate static on your body.
• Prevent the part from touching your clothing. Most clothing is insulative and retains a charge even when
you are wearing a wrist strap.
• Use a grounded work mat to provide a static-free work surface. The mat is especially useful when
handling ESD-sensitive devices.
• Select a grounding system, such as those listed below, to provide protection that meets the specific
service requirement.
Note: The use of a grounding system to guard against ESD damage is desirable but not necessary.
– Attach the ESD ground clip to any frame ground, ground braid, or green-wire ground.
– When working on a double-insulated or battery-operated system, use an ESD common ground or
reference point. You can use coax or connector-outside shells on these systems.
– Use the round ground prong of the ac plug on ac-operated computers.
Chapter 1.Safety information 3
Grounding requirements
Electrical grounding of the computer is required for operator safety and correct system function. Proper
grounding of the electrical outlet can be verified by a certified electrician.
Safety notices (multilingual translations)
The safety notices in this section are provided in the following languages:
• English
• Arabic
• Brazilian Portuguese
• French
• German
• Hebrew
• Japanese
• Korean
• Spanish
• Traditional Chinese
DANGER
DANGER
DANGER
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PERIGO
PERIGO
PERIGO
PERIGO
PERIGO
8Hardware Maintenance Manual
DANGER
DANGER
DANGER
DANGER
VORSICHT
10 Hardware Maintenance Manual
VORSICHT
VORSICHT
VORSICHT
12 Hardware Maintenance Manual
14 Hardware Maintenance Manual
16 Hardware Maintenance Manual
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20 Hardware Maintenance Manual
Chapter 2. General checkout
This chapter contains the following topics:
Before you go to the checkout instructions, ensure that you read the following important notes.
Important notes:
• Only certified trained personnel should service the computer.
• Before replacing any FRU, read the entire page on removing and replacing FRUs.
• When you replace FRUs, it is recommended to use new nylon-coated screws.
• Be extremely careful during such write operations as copying, saving, or formatting. Drives in the computer
that you are servicing sequence might have been altered. If you select an incorrect drive, data or programs might be
overwritten.
• Replace a FRU only with another FRU of the correct model. When you replace a FRU, make sure that the model
name and the FRU part number are correct by visiting https://support.lenovo.com/partslookup.
• A FRU should not be replaced because of a single, unreproducible failure. Single failures can occur for a variety
of reasons that have nothing to do with a hardware defect, such as cosmic radiation, electrostatic discharge, or
software errors. Consider replacing a FRU only when a problem recurs. If you suspect that a FRU is defective, clear
the error log and run the test again. If the error does not recur, do not replace the FRU.
• Be careful not to replace a nondefective FRU.
What to do first
When you return a FRU, you must include the following information in the parts exchange form or parts return
form that you attach to it:
1. Name and phone number of service technician
2. Date of service
3. Date on which the machine failed
4. Date of purchase
5. Failure symptoms, error codes appearing on the display, and beep symptoms
6. Procedure index and page number in which the failing FRU was detected
7. Failing FRU name and part number
8. Machine type, model number, and serial number
9. Customer's name and address
Note: During the warranty period, the customer may be responsible for repair costs if the computer damage
was caused by misuse, accident, modification, unsuitable physical or operating environment, or improper
maintenance by the customer. Following is a list of some common items that are not covered under warranty
and some symptoms that might indicate that the system was subjected to stress beyond normal use.
Before checking problems with the computer, determine whether the damage is covered under the warranty
by referring to the following list:
The following are not covered under warranty:
• LCD panel cracked from the application of excessive force or from being dropped
• Scratched (cosmetic) parts
• Distortion, deformation, or discoloration of the cosmetic parts
• Plastic parts, latches, pins, or connectors that have been cracked or broken by excessive force
© Copyright Lenovo 2019 21
• Damage caused by liquid spilled into the system
• Damage caused by the improper insertion of a personal-computer card (PC card) or the installation of an
incompatible card
• Improper disc insertion or use of an external optical drive
• Fuses blown by attachment of a non-supported device
• Forgotten computer password (making the computer unusable)
• Sticky keys caused by spilling a liquid onto the keyboard
• Use of an incorrect ac power adapter on laptop products
The following symptoms might indicate damage caused by non-warranted activities:
• Missing parts might be a symptom of unauthorized service or modification.
• Check for obvious damage to a hard disk drive. If the spindle of a hard disk drive becomes noisy, the hard
disk drive might have been dropped or subject to excessive force.
Checking the ac power adapter
If the computer fails only when the ac power adapter is used, refer to the information in this topic to check
the ac power adapter.
If the power-on indicator does not turn on, check the power cord of the ac power adapter for correct
continuity and installation.
To check the ac power adapter, do the following:
1. Unplug the ac power adapter cable from the computer.
2. Measure the output voltage across the plug of the ac power adapter cable. The correct voltages are
shown in the following table.
1
2
Pin Voltage (V dc)
1 +15
2 0
Note: The output voltage across pin 2 might differ from the voltage that you measure.
3. Depending on the voltage that you measure, do one of the following:
• If the voltage is not correct, replace the ac power adapter.
• If the voltage is acceptable, do the following:
a. Replace the system board.
b. If the problem persists, call the Customer Support Center.
Note: Noise from the ac power adapter does not always indicate a defect.
22 Hardware Maintenance Manual
24 Hardware Maintenance Manual
Chapter 3. Create and use a USB repair shim
What is a USB repair shim?
A USB repair shim is created by writing a repair shim image to a USB storage drive. Once created, it can be
used to boot and service the Chromebook computer, including:
• Diagnose problems and restore system to factory settings.
• Refresh the system with the latest firmware.
Before replacing any FRUs, use the repair shim to diagnose and identify problems.
Note: You do not need to use the repair shim to diagnose problems before replacing CRUs. For the list of
CRUs for your computer, refer to “Locating FRUs and CRUs” on page 29.
Create a repair shim
Step 1. Prepare a USB drive.The capacity of the USB drive should be at least 8 gigabytes (GB).
Attention: Creating repair shim deletes all files stored on the USB drive. Back up personal files
before creating the shim.
Step 2. Download the image file of the repair shim from http://www.lenovo.com/support. A Lenovo service
credential is needed to download the image file.
Attention: Make sure to download the latest version of the image file. A shim created with an
earlier version of the image file may cause the repair process to fail.
Step 3. Use a disk image tool to write the downloaded image to the USB drive. An open source tool Win32
Disk Imager is available for download at http://sourceforge.net/projects/win32diskimager.
Use a USB repair shim to diagnose and fix problems
Step 1. Remove the ROM write-protection screw and reassemble the computer.
Step 2. While holding down the esc key and the refresh key , press the Power key. The Chrome OS
recovery screen should be displayed.
Step 3. Connect the USB repair shim to the computer. The repair shim will update the computer firmware
and OS image automatically.
Step 4. When prompted, choose I to install the shim image to the computer. When the update is
completed, the computer restarts to the factory-test-image environment and then starts the Stress
Test. The Stress test will run for 10 minutes and then the Final Assembly Test and Pack (FATP)
section will start.
Note: When computer restarts, remove the repair shim and put it in a safe place.
Step 5. If the Vital Product Data (VPD) is displayed on the screen, press esc to continue.
If the system board is replaced, you are required to enter the VPD.
Note: The VPD is a 20 — character string.
© Copyright Lenovo 2019 25
Table 1. Combination of the 20 – character VPD
Preceding characters Machine type Model number SN
“1S”, 2 digits 7 digits 3 digits 8 digits
The MTM and SN can be found on the label attaching to the bottom cover.
Step 6. Follow the instructions on the screen to start the FATP Tests.
Step 7. If the factory test items reveal a defective component, turn off the computer, disconnect the ac
power adapter, and then replace the defective component.
Step 8. Re-enable the ROM write-protection by reinstalling the write-protection screw.
Step 9. Turn on the computer. The computer should starts to the factory-test-image environment again. It
is recommended that you run Stress Test and FATP Tests to ensure that new components function
correctly.
Step 10. Run the GoogleRequiredTests. If the tests finish successfully, all data stored on the computer will
be deleted and the computer will be turned off. If the GoogleRequiredTests fails, refer to “Common
issues leading to GoogleRequiredTests fail” on page 27.
Note: If any test is marked as failed, the final process cannot be completed. The final process can
be forced to end by pressing the f key. Do not force the final process to end when a component
fails the test. Force the final process to end only when the test has to be bypassed because it
cannot be performed.
After the repair process finishes, the built-in battery is disabled. The system is in a clean out-of-box state. In
order to turn on the computer, attach the ac power adapter to the power connector on the computer first. If
applicable, customers must re-enroll the system for enterprise enrollment.
Factory test items
When the computer restarts to the factory-test-image environment, factory test items will run automatically.
Table 2. Factory test items
Test item Description
Stress Test The Stress Test is designed to test how the system
functions under stress by running the maximum workload
applications. The Stress Test includes the test of memory,
microprocessor, and graphics card. The test takes about
10 minutes to finish.
FATP Test The FATP Test is designed to test the individual
component to verify its function, such as the display,
audio, camera, keyboard, and other components. It is
recommended that you run all the FATP Test items. Some
test items might require an HDMI monitor or an SD card. If
the devices are not available, the tests can be bypassed,
but with the overall test marked as failed. This will require
the finalized step of the GoogleRequiredTests to be
forced in order to complete the servicing of the computer.
GoogleRequiredTests GoogleRequiredTests checks the system status and
helps reset the system back to the factory-default
settings. If any tests fails, the system cannot be finalized.
26 Hardware Maintenance Manual
Common issues leading to GoogleRequiredTests fail
Issue Description
HWID mismatch
Each Chromebook has a known hardware
configuration. Each configuration is assigned an
HWID. HWID mismatch can be caused by using
unauthorized parts, or missing parts.
If the write-protect function is not turned off before
recovering the computer with the repair shim, it will
also cause HWID mismatch.
Write-protect function is off System cannot be finalized until the write-protect
function is turned back on.
Hardware identify
A set of valid hardware identities (HWIDs) are provided by Google. Google logs the exact hardware
combination into a Chromebook and creates a HWID. The HWID is used to ensure that all parts are valid
during the repair of the Chromebook. The HWID is used for the following purposes:
• Auto-update new patches and software for the lifetime of the computer
• Recover the computer to the factory default settings
If unauthorized parts are installed, you might not get the correct auto-updates for your computer, or you
might not recover your computer successfully to the factory default settings. For example, if you install a
different model of the wireless LAN card, which is not the required configuration, the HWID will not match.
HWID is checked by using the repair shim.
Chapter 3.Create and use a USB repair shim 27
28 Hardware Maintenance Manual
Chapter 4. Identifying FRUs (CRUs)
Locating FRUs and CRUs
This topic introduces the following service parts:
“Major FRUs and CRUs” on page 30
“LCD FRUs and CRUs” on page 32
“Miscellaneous parts” on page 33
Notes:
• Each FRU is available for all types or models, unless otherwise specified.
• CRU statement for customers:
You can resolve some problems with your product with a replacement part you can install yourself, called
a “Customer Replaceable Unit” or “CRU.” Some CRUs are designated as self-service CRUs and others
are designated as optional-service CRUs. Installation of self-service CRUs is your responsibility. For
optional-service CRUs, you can either install the CRU yourself or you can request that a Service Provider
install the CRU according to the warranty service for your product. If you intend on installing the CRU,
Lenovo will ship the CRU to you. CRU information and replacement instructions are shipped with your
product and are available from Lenovo at any time upon request. You can find a list of CRUs for your
product in this Hardware Maintenance Manual. An electronic version of this manual can be found at
https://support.lenovo.com. Click Documentation and then follow the on-screen instructions to find the
manual for your product. You might be required to return the defective CRU. When return is required: (1)
return instructions, a prepaid shipping label, and a container will be included with the replacement CRU;
and (2) you might be charged for the replacement CRU if Lenovo does not receive the defective CRU
within thirty (30) days of your receipt of the replacement CRU. See your Lenovo Limited Warranty
documentation for full details.
Your computers contain the following types of CRUs and FRUs:
– Self-service CRUs: Refer to parts that can be installed or replaced easily by customer themselves or
by trained service technicians at an additional cost.
– Optional-service CRUs: Refer to parts that can be installed or replaced by customers with a greater
skill level. Trained service technicians can also provide service to install or replace the parts under the
type of warranty designated for the customer’s machine.
– FRUs: Refer to parts that must be installed or replaced only by trained service technicians. If customers
choose to replace the FRUs by themselves, the product warranty might be affected..
© Copyright Lenovo 2019 29
Major FRUs and CRUs
a
b
c
e
g
h
f
d
k
l
i
j
Figure 1. Lenovo 14e Chromebook exploded view
30 Hardware Maintenance Manual
Note: Depending on the computer model, your computer might look different from the illustration above.
Table 3. Major FRUs and CRUs
No. FRU description Self-service CRU Optional-service CRU
1LCD module - -
2
Upper case (with keyboard) No No
Antennas (main + auxiliary) No No
3Touchpad assembly No No
4System board No No
5Speakers No No
6Wi-Fi card No No
7I/O board and I/O board cables No No
8I/O brackets (L + R) No Yes
9Power cord *Yes Yes
10 ac power adapter Yes Yes
11 Battery pack No Yes
12 Lower case No Yes
* for selected models
Chapter 4.Identifying FRUs (CRUs) 31
LCD FRUs and CRUs
a
d
c
e
f
g
h
b
Figure 2. LCD module – exploded view
32 Hardware Maintenance Manual
Table 4. LCD FRUs and CRUs
No. FRU description Self-service CRU Optional-service CRU
1LCD bezel No No
2LCD panel No No
3Removable tapes No No
4Hinge covers No No
5Hinges No No
6EDP cable No No
7Camera board No No
8LCD cover No No
Miscellaneous parts
Table 5. Miscellaneous parts
FRU descriptions Self-service CRU Optional-service CRU
Screw kit:
• Screw M2.0 x 2.0, silver (5)
• Screw M2.0 x 2.5, black (1)
• Screw M2.0 x 3.0, black (5)
• Screw M2.0 x 4.0, black (3)
• Screw M2.0 x 5.0, silver (10)
• Screw M2.0 x 6.0, black (3)
• Screw M2.0 x 8.0, black (3)
• Screw M2.5 x 2.2, black (6)
• Screw M2.5 x 5.0, silver (4)
No No
Two acetate fabric tapes (for speakers) No No
Conductive tape (for touchpad) No No
Looking up the FRU information
For detailed FRU information, including part numbers, descriptions, and substitution part numbers, go to:
https://support.lenovo.com/partslookup
Chapter 4.Identifying FRUs (CRUs) 33
34 Hardware Maintenance Manual
Chapter 5. Removing a FRU or CRU
General guidelines
When removing or replacing a FRU, ensure that you observe the following general guidelines:
1. Do not try to service any computer unless you have been trained and certified. An untrained person runs
the risk of damaging parts.
2. Begin by removing any FRUs that have to be removed before replacing the failing FRU. Any such FRUs
are listed at the beginning of each FRU replacement procedure. Remove them in the order in which they
are listed.
3. Follow the correct sequence in the steps for removing a FRU, as shown in the illustrations by the
numbers in square callouts.
4. When removing a FRU, move it in the direction as shown by the arrow in the illustration.
5. To install a new FRU in place, perform the removal procedure in reverse and follow any notes that
pertain to replacement.
6. When replacing a FRU, carefully retain and reuse all screws. If screws are missing, look up details in
“Miscellaneous parts” on page 33 for replacement screws and order them through the Lenovo CRM
system.
7. When replacing the base cover, reapply all labels that come with the replacement base cover. If some
original labels are not included with the replacement base cover, peal them off from the original base
cover and paste them on the replacement base cover.
DANGER
Before removing any FRU or CRU, shut down the computer and unplug all power cords from
electrical outlets.
Attention:
• After replacing a FRU, do not turn on the computer until you have ensured that all screws, springs, and
other small parts are in place and none are loose inside the computer. Verify this by shaking the computer
gently and listening for rattling sounds. Metallic parts or metal flakes can cause electrical short circuits.
• The system board is sensitive to and can be damaged by ESD. Before touching it, establish personal
grounding by touching a ground point with one hand or by using an ESD strap (P/N 6405959).
Cut off the power supply from the built-in battery pack
Before replacing any FRUs, cut off the power supply from the built-in battery pack.
Step 1. Turn off the computer.
Step 2. While holding down the esc key and the refresh key , press the Power key.
Step 3. When the message Chrome OS is missing or damaged. Please insert a recovery USB stick or SD card.
is printed, press ctrl + d. The computer will restart automatically.
Note: When the message OS verification is OFF. Press Space to re-enable. is printed, do not press
the space key.
Step 4. When prompted to log on to the computer, press and hold down three keys: ctrl, alt, and the
forward key . The Terminal window should be displayed.
© Copyright Lenovo 2019 35
Step 5. When prompted to log on to the local host, type chronos and press enter.
Step 6. Type sudo bash and press enter.
Step 7. Type ectool batterycutoff and press enter.
Step 8. When the message SUCCESS. The battery has arranged a cut-off and the system should be
shutdown immediately. is printed, disconnect the ac power adapter from the computer and the
computer turns off immediately. If you re-connect the ac power adapter, power supply from the
built-in battery pack will resume.
Remove the lower case
Make sure the computer has been turned off before servicing the computer.
Step 1. Place the computer upside down on a flat surface. Loosen the 9 screws.
3
3
2
3
2
1
1
1
2
Figure 3. Loosen the 9 screws
Screw specifications Number of screws Color
1 M2.0 x 4.0 3 Black
2 M2.0 x 6.0 3 Black
3 M2.0 x 8.0 3 Black
Step 2. Insert a pry tool to separate the lower case from upper case.
4
4
4
4
Figure 4. Separate the lower case from upper case
36 Hardware Maintenance Manual
Step 3. Remove the lower case.
3
Figure 5. Remove the lower case
Refer to “Major FRUs and CRUs” on page 30 to look up details about the following replacement part:
Lower case
Remove the battery pack
Make sure the following FRU (or CRU) has been removed.
“Remove the lower case” on page 36
Step 1. Remove the 4 screws.
1
1
1
1
Figure 6. Remove the 4 screws
Screw specifications Number of screws Color
1 M2.0 x 5.0 4 Silver
Attention: Do not directly detach the battery pack connector because there is no sufficient space
(only 12 mm) for detachment before removing the 4 screws.
Chapter 5.Removing a FRU or CRU 37
Step 2. Detach the battery pack connector from the system board.
2
Figure 7. Detach the battery pack connector
Attention: Use your fingernails to unplug the battery pack connector. Do not pull the cable with
force.
Step 3. Remove the battery pack.
3
Figure 8. Remove the battery pack
Refer to “Major FRUs and CRUs” on page 30 to look up details about the following replacement part:
Battery pack
Remove the Wi-Fi card
Make sure the following FRUs (or CRUs) have been removed.
“Remove the lower case” on page 36
“Remove the battery pack” on page 37
38 Hardware Maintenance Manual
Step 3. Remove the Wi-Fi card by pulling it away from the slot.
3
Figure 11. Remove the Wi-Fi card
Refer to “Major FRUs and CRUs” on page 30 to look up details about the following replacement part:
Wi-Fi card
Remove the I/O board
Make sure the following FRUs (or CRUs) have been removed.
“Remove the lower case” on page 36
“Remove the battery pack” on page 37
Step 1. Detach the two I/O board connectors from the system board.
1
2
Figure 12. Detach the two I/O board connectors
40 Hardware Maintenance Manual
Step 2. Remove the screws.
3
4
5
5
Figure 13. Remove the screws
Screw specifications Position Number of screws Color
3 M2.5 x 5.0 Hinge (right) 2Silver
4 M2.0 x 5.0 I/O bracket (right) 3Silver
5 M2.0 x 3.0 I/O board 2 Black
Step 3. Remove the right I/O bracket.
6
Figure 14. Remove the right I/O bracket
Chapter 5.Removing a FRU or CRU 41
Step 4. Open the right hinge.
7
Figure 15. Open the right hinge
Step 5. Remove the I/O board.
8
Figure 16. Remove the I/O board
Refer to “Major FRUs and CRUs” on page 30 to look up details about the following replacement parts:
I/O bracket (right)
I/O board
Remove the speakers
Make sure the following FRUs (CRUs) have been removed.
“Remove the lower case” on page 36
“Remove the battery pack” on page 37
42 Hardware Maintenance Manual
Step 1. Detach the speaker connector from the system board.
1
Figure 17. Detach the speaker connector
Step 2. Peel off two acetate fabric tapes.
2
2
Figure 18. Peel off the acetate fabric tapes
Step 3. Fold the keyboard cable upwards to release the speaker cables.
3
Figure 19. Fold the keyboard cable upwards
Chapter 5.Removing a FRU or CRU 43
Step 4. Remove the speakers.
4
4
Figure 20. Remove the speakers
Refer to “Major FRUs and CRUs” on page 30 to look up details about the following replacement part:
speakers
Remove the system board
Make sure the following FRUs (or CRUs) have been removed.
“Remove the lower case” on page 36
“Remove the battery pack” on page 37
“Remove the Wi-Fi card” on page 38
Step 1. Detach the 6 connectors from the system board as follows:
• two I/O board connectors
• EDP cable connector
• speaker connector
• keyboard connector
• touchpad connector
44 Hardware Maintenance Manual
Step 3. Remove the left I/O bracket.
8
Figure 23. Remove the left I/O bracket
Step 4. Open the left hinge.
9
Figure 24. Open the left hinge
Step 5. Carefully remove the system board.
10
Figure 25. Remove the system board
Refer to “Major FRUs and CRUs” on page 30 to look up details about the following replacement part:
System board
46 Hardware Maintenance Manual
I/O bracket (left)
Remove the upper case (with keyboard)
Make sure the following FRUs (CRUs) have been removed.
“Remove the lower case” on page 36
“Remove the battery pack” on page 37
Step 1. Detach the EDP cable connector from the system board.
1
Figure 26. Detach the EDP cable connector
Step 2. Remove the 4 screws that secure the hinges to the upper case.
2
2
2
2
Figure 27. Remove the 4 screws
Screw specifications Number of screws Color
2 M2.5 x 5.0 4 Silver
Step 3. Open the 2 hinges.
Chapter 5.Removing a FRU or CRU 47
3
3
Figure 28. Open the hinges
Step 4. Remove the upper case in the arrow direction shown below.
4
Figure 29. Remove the upper case
Attention: Do not pull out the upper case before detaching the EDP cable connector. Otherwise
the cable may be damaged.
Refer to “Major FRUs and CRUs” on page 30 to look up details about the following replacement part:
Upper case (with keyboard)
Remove the touchpad assembly
Make sure the following FRUs (or CRUs) have been removed:
“Remove the lower case” on page 36
“Remove the battery pack” on page 37
Step 1. Detach the touchpad connector from the system board.
48 Hardware Maintenance Manual
5
5
5
6
6
Figure 33. Remove the 5 screws
Screw specifications Position Number of screws Color
5 M2.0 x 2.0 Touchpad 3 Silver
6 M2.0 x 2.0 Touchpad bracket 2 Silver
Step 5. Remove the touchpad bracket.
7
Figure 34. Remove the touchpad bracket
Step 6. Remove the touchpad.
8
Figure 35. Remove the touchpad
50 Hardware Maintenance Manual
Refer to “Major FRUs and CRUs” on page 30 to look up details about the following replacement part:
touchpad assembly
conductive tape
Disassemble the LCD module
The LCD module as a whole is not a FRU. Instead, it contains FRUs as its components. Before
disassembling the LCD module, make sure it has been detached from the upper case. Refer to “Remove the
upper case (with keyboard)” on page 47 for instructions.
Remove the LCD panel
Make sure the following FRUs (or CRUs) have been removed.
“Remove the lower case” on page 36
“Remove the battery pack” on page 37
“Remove the upper case (with keyboard)” on page 47
Step 1. Insert a pry piece under the lower inner side of the LCD bezel and then carefully pull the LCD bezel
outwards. Repeat this action along the inner edges of the LCD bezel until all hooks that secure the
LCD bezel are detached.
1
1
1
1
1
1
1
1
Figure 36. Pull the inner sides of the LCD bezel
Chapter 5.Removing a FRU or CRU 51
Step 2. Remove two hinge covers on the left and right.
2
2
Figure 37. Remove the hinge covers
Step 3. Remove the 6 screws.
3
3
3
3
3
3
Figure 38. Remove the 6 screws
Screw specifications Number of screws Color
3 M2.5 x 2.2 6 Black
52 Hardware Maintenance Manual
Step 4. Remove the left and right hinges.
4
4
Figure 39. Remove the hinges
Step 5. Pull out two removable tapes on the left and right.
5
5
Figure 40. Pull out two removable tapes
Step 6. Carefully lift the LCD panel, detach the EDP cable connector from the panel, and then remove the
LCD panel.
Chapter 5.Removing a FRU or CRU 53
7
6
Figure 41. Detach the EDP cable connector and remove the LCD panel
Refer to “LCD FRUs and CRUs” on page 32 to look up details about the following replacement parts:
LCD bezel
Hinge cover
Hinges
Removable tapes
LCD panel
Remove the camera board
Make sure the following FRUs (or CRUs) have been removed.
“Remove the lower case” on page 36
“Remove the battery pack” on page 37
“Remove the upper case (with keyboard)” on page 47
“Remove the LCD panel” on page 51
Step 1. Detach the camera connector.
54 Hardware Maintenance Manual
1
Figure 42. Detach the camera connector
Step 2. Release the EDP cable. Then, remove the EDP cable and camera board.
3
2
Figure 43. Remove the EDP cable and camera board
CAUTION:
The camera board is fragile and easily bent. Remove it with great care.
Refer to “LCD FRUs and CRUs” on page 32 to look up details about the following replacement parts:
EDP cable
Camera board
LCD cover
Chapter 5.Removing a FRU or CRU 55
56 Hardware Maintenance Manual
Appendix A. Features and connectors
1 2 3
10
9
11
12
13
4
5
6
7
8
3
Figure 44. 14e Chromebook features and connectors
Table 6. Features and connectors
No. Feature or connector
1Camera light
2Camera
3Microphones
4dc-in / USB-C connector
5dc-in light
6USB 3.0 (Type-A) connector
7Combo audio connector
8microSD card slot
9Security-lock slot
10 Power key
11 USB-C connector
12 USB 3.0 (Type-A) connector
13 Touchpad
© Copyright Lenovo 2019 57
58 Hardware Maintenance Manual
Appendix B. Label locations
aa
b
c
d
e
f
g
i
h
Figure 45. Label layout on the back side of the base cover
Labels attached to the base cover are country/region specific. Make sure to apply the appropriate labels to
the replacement base cover.
Table 7. All base cover labels
Label Label description Applied country/region Label dimensions
aGEO label all 90 mm x 15 mm
bMTM S/N label all 35 mm x 13 mm
cICASA system label South Africa 16 mm x 8 mm
dIndonesia rating label Indonesia 55 mm x 15 mm
eIsrael label Israel 50 mm x 19 mm
fMexico label Mexico 66 mm x 26.5 mm
gIndonesia postel label Indonesia 15 mm x 10 mm
hMalaysia SLP Malaysia 10 mm x 10 mm
IBIS logo label India 18 mm x 18 mm
© Copyright Lenovo 2019 59
60 Hardware Maintenance Manual
Trademarks
LENOVO and the LENOVO logo are trademarks of Lenovo. USB is a trademark of USB Implementers Forum.
Wi-Fi is registered trademark of Wi-Fi Alliance. USB-C is a trademark of USB Implementers Forum. All other
trademarks are the property of their respective owners. © 2019 Lenovo.
