Lenovo Hardware Maintenance Manual 500e Chromebook (Lenovo) Hmm 201801

2018-02-05

User Manual: Lenovo Hardware Maintenance Manual - 500e Chromebook 500e Chromebook (Lenovo) 500e Chromebook

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Hardware Maintenance Manual

500e Chromebook

Hardware Maintenance Manual

500e Chromebook

First Edition (January 2018)
© Copyright Lenovo 2018.

Contents
Chapter 1. Safety information . . . . . . 1
General safety . . . . . . . . . . . . . .
Electrical safety . . . . . . . . . . . . . .
Safety inspection guide . . . . . . . . . . .
Handling devices that are sensitive to electrostatic
discharge . . . . . . . . . . . . . . . .
Grounding requirements . . . . . . . . . .
Safety notices (multilingual translations) . . . .

. . 1
. . 1
. . 2
. . 3
. . 4
. . 4

Chapter 2. General checkout . . . . . 21
What to do first . . . . . . . . . . . . . . .
500e Chromebook — CRU list . . . . . . . . .

21
22

Chapter 3. Create and use a USB
repair shim . . . . . . . . . . . . . . . 23
What is a USB repair shim? . . . . . .
Create a repair shim . . . . . . . . .
Boot into Developer Mode. . . . . . .
Disable ROM-write protection . . . . .
Use a USB repair shim to diagnose and fix
problems . . . . . . . . . . . . .
Factory test items . . . . . . . .

.
.
.
.

23
23
23
24

. . . .
. . . .

24
25

Chapter 4. Idetifying FRUs (CRUs) . . 27
All FRUs (CRUs) for Lenovo 500e Chromebook . .

Chapter 5. Removing a FRU or
CRU . . . . . . . . . . . . . . . . . . 31

General guidelines. . . . . . . . . . . . .
Cut off the power supply from the built-in battery
pack . . . . . . . . . . . . . . . . . .
Remove the back cover. . . . . . . . . . .
Remove the LCD module . . . . . . . . . .
Remove the battery pack . . . . . . . . . .
Remove the speakers . . . . . . . . . . .
Remove the WLAN & Bluetooth combo module .
Remove the USB board. . . . . . . . . . .
Remove the system board and WorldFacing
camera . . . . . . . . . . . . . . . . .
Disassemble the LCD module . . . . . . . .
Remove the LCD strip cover . . . . . . .
Remove the LCD panel . . . . . . . . .
Remove the hinges. . . . . . . . . . .

.
.
.
.
.
.
.

31
32
33
34
35
35
36

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.
.

37
38
38
39
40

Appendix A. Features, controls, and
connectors . . . . . . . . . . . . . . . 43
Appendix B. Lenovo part numbers
for replacement FRUs . . . . . . . . . 45
Appendix C. Lenovo part numbers
for CRUs and miscellaneous parts . . 47
Appendix D. Label locations . . . . . 51
Trademarks . . . . . . . . . . . . . . . . . liii

iii

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

– 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
• Mechanical hazards, such as loose or missing hardware

Hardware Maintenance Manual

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

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

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DANGER

Chapter 1. Safety information

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PERIGO

Chapter 1. Safety information

PERIGO

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DANGER

Chapter 1. Safety information

DANGER

VORSICHT

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VORSICHT

Chapter 1. Safety information

VORSICHT

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Chapter 1. Safety information

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Chapter 1. Safety information

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Chapter 1. Safety information

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Chapter 1. Safety information

Hardware Maintenance Manual

Chapter 2. General checkout
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
of the machine and the FRU part number are correct by referring to the FRU parts list.
• 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
• 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.

500e Chromebook — CRU list
Model: Lenovo 500e Chromebook
MT: 81ES
CRU

Type

ac power adapter

self-service

power cord

self-service

stylus

self-service

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 “500e Chromebook — CRU list” on page 22.

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.

Boot into Developer Mode
Step 1.

Shut down the Chromebook.

Step 2.

While holding down esc and the Refresh key, press the power button.Wait for the Chromebook to
boot in Recovery Mode.

Step 3.

When the recovery screen is displayed, press ctrl — d.
Note: A message “Please insert a recovery USB stick or SD card.” is typically displayed on the
Recovery screen.

Step 4.

Press Enter to turn OS verification OFF.
Attention: If you press Enter, all local data on your Chromebook will be deleted.

Step 5.

Wait for the Chromebook to restart or press ctrl —d to start immediately.Your Chromebook will
restart and prepare to boot into Developer Mode.
Note: It takes about 10 to 15 minutes for your Chromebook to transition into Developer Mode.

If you need to boot into normal mode, start your Chromebook, press the Space key when the message “OS
Verification is OFF” is displayed.

Disable ROM-write protection
You need to disable the ROM-write protection function before you can use a repair shim to diagnose and fix
problems.
Step 1.

Disconnect and the re-connect the battery cable.Refer to “Remove the back cover” on page 32 for
how to locate and disconnect the battery cable.

Step 2.

Connect the Chromebook to ac power to activate the battery.

Step 3.

Boot the Chromebook into Developer Mode.Refer to “Boot into Developer Mode” on page 23 for
instructions.

Step 4.

Press ctrl —alt — →(F2) to display the virtual terminal.

Step 5.

Type root and press Enter to log in as root.

Step 6.

Type the following command and press Enter at the command prompt.

Step 7.

Type the following command and press Enter at the command prompt.

Step 8.

Press the Refresh key and the power button to restart the Chromebook.

flashrom –p host –wp-disable
flashrom –p ec –wp-disable

The ROM-write protection is disable after restart.

Use a USB repair shim to diagnose and fix problems
Make sure the ROM-write protection has been disabled. Refer to “Disable ROM-write protection” on page 24
for instructions.
Step 1.

While holding down the esc and the refresh key
recovery screen should be displayed.

Step 2.

Connect the USB repair shim to the computer. The repair shim will update the computer firmware
and OS image automatically.

Step 3.

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 Final Function Test
(FFT). The FFT will run for 10 minutes and then the Final Assembly Test (FAT) will start.

, press the power button.The Chrome OS

Note: When computer restarts, remove the repair shim and put it in a safe place.
Step 4.

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.
Table 1. Combination of the 20 – character VPD

Preceding
characters

Machine type

Model number

“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 5.

Follow the instructions on the screen to start the Final Function Test (FFT).

Hardware Maintenance Manual

Step 6.

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 7.

Turn on the computer.The computer should starts to the factory-test-image environment again. It is
recommended that you run Final Function Test (FFT) to ensure that new components function
correctly.

Step 8.

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 26.
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 is completed, 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.
Note: ROM-write protection is re-activated after the repair process.

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.

Chapter 3. Create and use a USB repair shim

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.

Hardware Maintenance Manual

Chapter 4. Idetifying FRUs (CRUs)
All FRUs (CRUs) for Lenovo 500e Chromebook
The exploded illustrations help Lenovo service technicians identify FRUs or CRUs that they may need to
replace when servicing a customer’s computer.
Refer to Appendix B “Lenovo part numbers for replacement FRUs” on page 45 if you need to look up Lenovo
part numbers for a particular FRU or CRU.

d
e

g
h
g
i

Figure 1. 500e Chromebook exploded view
Table 3. FRU (CRU) categories
No.

FRU (CRU) category

LCD module

Upper case (with keyboard)

Stylus

Hardware Maintenance Manual

Table 3. FRU (CRU) categories (continued)
4

Secondary (WorldFacing) camera

System board

USB brackets

WLAN & Bluetooth combo module

USB board

Battery

Speakers

Back cover

Rubber pack

Screw pack

5
6

Figure 2. LCD module — exploded view

Chapter 4. Idetifying FRUs (CRUs)

Table 4. FRU categories for the LCD module
No.

FRU (CRU) category

Display module

LCD rubbers

LCD strip cover

Camera (front)

Hinges

Hinge rubbers

eDP cable

LCD base cover

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 the Lenovo
parts numbers in Appendix C “Lenovo part numbers for CRUs and miscellaneous parts” on page 47 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. Refer to Appendix D “Label locations” on page 51
for the layout of labels on the back side of the 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.
Attention: 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.

Boot the Chromebook into Developer Mode.Refer to “Boot into Developer Mode” on page 23 for
instructions.

Step 2.

Press ctrl —alt — →(F2) to display the virtual terminal.

Step 3.

Type chronos and press Enter to log in.

Step 4.

Type sudo bash and press Enter.
Note: If you have set up a password for the chronos account, type the password when prompted.
The following message should be displayed after you press Enter.

We trust you have received the usual lecture from the local system administrator. It usually boils down to these

three things:
#1) Respect the privacy of others
#2) Think before you type
#3) With great power comes great responsibility

Step 5.

Type ectool batterycutoff and press Enter.

Step 6.

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 back cover
Step 1.

Place the Chromebook on a desk, with the base cover facing upwards.

Step 2.

Remove the screws.
a
a

a
a
a
a

Table 5. Screw specifications

Step 3.

Screw location

Quantity

Specifications

Back cover

M2.5 × 6 mm

Use a bar to pry the illustrated position; slowly pull the back cover along the edges until it is
completely detached from the Chromebook.

Hardware Maintenance Manual

c
d

b
c

Refer to Table 16 “Part numbers for FRUs (CRUs)” on page 45 to look up the Lenovo part number for the
replacement back cover.

Remove the LCD module
Make sure the following FRUs (CRUs) have been removed and the battery connector has been detached.
“Remove the back cover” on page 32
Step 1.

Disconnect the antenna cables and the LCD cable from the system board.

a
d
b
c

Step 2.

Remove the screws.
Table 6. Screw specifications — removing the LCD module

Step 3.

Screw
location

Quantity

Specifications

Hinges to
upper case

M2.5 × 5 mm

Lift up the LCD module to detach it from the upper case.

The LCD module is not a FRU. Instead, it contains FRUs as its components. Refer to “Disassemble the LCD
module” on page 38 if you need to replace a FRU contained in the LCD module.

Chapter 5. Removing a FRU or CRU

Remove the battery pack
Make sure the following FRUs (or CRUs) have been removed.
“Remove the back cover” on page 32
Step 1.

Disconnect the cable that is on top of the battery; unplug the battery cable from the system board.

c
a

Attention: Use your fingernail to pull the connector to unplug it. Do not pull the cable itself.
Step 2.

Remove the screws and take out the battery pack.
a

b
a
a

Table 7. Screw specifications
Screw
location

Quantity

Specifications

Color

Battery pack
to upper
case

M2 × 4 mm

Silver

Refer to Table 16 “Part numbers for FRUs (CRUs)” on page 45 to look up the Lenovo part numbers for the
following replacement parts:
Battery pack

Hardware Maintenance Manual

Remove the speakers
Make sure the following FRUs (CRUs) have been removed.
“Remove the back cover” on page 32
Step 1.

Unplug the speakers’ cable from the system board.
b

b
c

a
b
b

Figure 3. Unplug the speakers’ cable from the system board

Step 2.

Remove the screws.
Table 8. Screw specifications

Step 3.

Screw location

Quantity

Specifications

Speakers to
upper case

M2 x 2.5 mm

Carefully take the cable out of guiders and remove the speakers.

Refer to Table 16 “Part numbers for FRUs (CRUs)” on page 45 to look up the Lenovo part numbers for the
replacement speakers.

Remove the WLAN & Bluetooth combo module
Make sure the following FRUs (CRUs) have been removed and the battery connector has been detached.
“Remove the back cover” on page 32
Step 1.

Disconnect the white and black cables.

Chapter 5. Removing a FRU or CRU

b
c

a
a

Figure 4. Disconnect antenna cables

Step 2.

Remove the screw and pull out the WLAN & Bluetooth combo module in the direction as shown by
the arrow.
Table 9. Screw specifications — removing the WLAN & Bluetooth combo module
Screw location

Quantity

Specifications

WLAN&Bluetooth
combo card to
upper case

M2 x 3 mm

Refer to Table 16 “Part numbers for FRUs (CRUs)” on page 45 to look up the Lenovo part numbers for the
replacement WLAN & Bluetooth combo modules.

Remove the USB board
Make sure the following FRUs (CRUs) have been removed:
“Remove the back cover” on page 32
“Remove the LCD module” on page 33
Step 1.

Disconnect the cables between the USB board and the system board.

b
d
c

Figure 5. Disconnect the two cable

Step 2.

Remove the screw.

Hardware Maintenance Manual

Table 10. Screw specifications

Step 3.

Screw location

Quantity

Specifications

USB board to
upper case

M2 × 4 mm

Remove the USB bracket and the USB board.

Refer to Table 16 “Part numbers for FRUs (CRUs)” on page 45 to look up the Lenovo part numbers for the
following replacement parts:
USB board
USB brackets
Note: The replacement USB board includes two cables for connecting with the system board; replacement
USB brackets come in left and right pairs.

Remove the system board and WorldFacing camera
“Remove the back cover” on page 32
“Remove the LCD module” on page 33
“Remove the WLAN & Bluetooth combo module” on page 35
Step 1.

Disconnect all cables from the system board.
Notes: Cables that care connected with the system board includes:
• Battery cable
• USB board cables
• Antenna cables
• LCD cable
• Speaker cable
• Touch pad cable
• Keyboard cable
c

d
e

Step 2.

Remove the screws and take out the system board.

Chapter 5. Removing a FRU or CRU

Table 11. Screw specifications — removing the LCD module

Step 3.

Screw
location

Quantity

Specifications

system
board to
upper case

M2 ×4 mm

Remove the WorldFacing camera.

Refer to Table 16 “Part numbers for FRUs (CRUs)” on page 45 to look up the Lenovo part numbers of the
following replacement parts:
System board
USB brackets
Secondary camera
Upper case
Note: Replacement USB brackets come in left and right pairs; the secondary camera comes in a kit with
rubbers, cables, sponges, and adhesive tapes.

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 base cover. Refer to “Remove the
LCD module” on page 33 for instructions.

Remove the LCD strip cover
Step 1.

Pry out the two rubbers and remove the screws underneath them.
Table 12. Screw specifications — removing the LCD bezel

Screw location

Quantity

Specifications

Strip cover to LCD
base cover

M2 × 3 mm

Hardware Maintenance Manual

a
b
d

a
b
c

Step 2.

Pry the strip cover at the illustrated position.

Step 3.

Detach and remove the strip cover.

Refer to Table 17 “Part numbers for LCD FRUs” on page 46 to look up the Lenovo part numbers for the
following replacement parts.
Strip cover
Screen rubbers
Note: Screen rubbers come in a pack of 20.

Remove the LCD panel
Make sure the following FRUs (or CRUs) have been removed.
“Remove the LCD strip cover” on page 38
Step 1.

Remove the screws.
c

a
b
a
a

Figure 6. Remove 4 screws and lift up the LCD panel
Table 13. Screw specifications — removing the LCD panel

Step 2.

Screw
location

Quantity

Specifications

LCD panel
to LCD
base cover

M2 × 3 mm

Slide down the LCD panel in the illustrated direction 2 .

Chapter 5. Removing a FRU or CRU

Step 3.

Holding the upper edge of the LCD panel, slowly lift up the LCD panel 3 .
Attention: Do not remove the LCD panel at this step. The LCD panel is connected by a cable at
the back side. Detach the cable before removing the LCD panel.

Step 4.

From the back of the LCD panel, disconnect the LCD cable 1 , the gynometer cabel
d
b

a
c

Step 5.

Remove the LCD panel.

Refer to Table 17 “Part numbers for LCD FRUs” on page 46 to look up the Lenovo part numbers for
replacement LCD panels.

Remove the hinges
Make sure the following FRUs (or CRUs) have been removed.
“Remove the LCD strip cover” on page 38
“Remove the LCD panel” on page 39
Step 1.

Remove the screws.
b

a
b

a
a a

Table 14. Screw specifications — removing the hinges and the WLAN antennas

Number

Screw location

Quantity

Specifications

hinges to LCD base cover

M2 × 3 mm

hinges to LCD base cover

M2 × 2.5 mm

Hardware Maintenance Manual

Step 2.

Lift up the hinges 1 ; pry out of the rubbers 2 , then take out all cables.
a

Refer to Appendix B “Lenovo part numbers for replacement FRUs” on page 45 to look up the Lenovo part
numbers for the following replacement parts.
Hinges
Hinge rubbers
eDP cable
LCD back cover
Note: Replacement hinges come in left and right pairs; hinge rubbers come in a pack of 20; the eDP cable
includes the LCD cable and the front-camera cable; the LCD back cover includes the antennas, aluminum
foils, sponges, and accessory parts.

Chapter 5. Removing a FRU or CRU

Hardware Maintenance Manual

Appendix A. Features, controls, and connectors

16 17

10
11
12
13
14
15
14

Figure 7. 500e Chromebook features and connectors
Table 15. 500e Chromebook features and connectors
No.

Feature or connector

Camera light

Camera (front)

Microphone hole

Wireless antennas (invisible from the outside)

Display (with touch function)

Secondary camera (WorldFacing)

Camera light

Microphone hole

Touch pad

Kensington Mini Security slot

USB (Type-C) connector

USB (Type-A) connector

Power button

Table 15. 500e Chromebook features and connectors (continued)
14

Volume buttons

Stylus

dc-in light

dc-in / USB (Type-C) connector

USB (Type-A) connector

microSD card slot

Combo audio connector

Hardware Maintenance Manual

Appendix B. Lenovo part numbers for replacement FRUs
When servicing a customer’s computer, Lenovo service technicians may use part numbers listed in the
following tables to order replacement parts through Lenovo CRM (customer relationship management)
system.
Table 16. Part numbers for FRUs (CRUs)
No. FRU (CRU) category
2

Parts description

Lenovo part number

Upper Case B 81ES W/KB US

5CB0Q79737

Upper Case B 81ES W/KB UK

5CB0Q79763

Upper Case B 81ES W/KB ITA

5CB0Q79721

Upper Case B 81ES W/KB SPA

5CB0Q79764

Upper Case B 81ES W/KB LSP

5CB0Q79722

Upper Case B 81ES W/KB CFEn

5CB0Q79766

Upper Case B 81ES W/KB FR

5CB0Q79754

Upper Case B 81ES W/KB GE

5CB0Q79718

Upper Case B 81ES W/KB ARA

5CB0Q79746

Upper Case B 81ES W/KB HEB

5CB0Q79731

Upper Case B 81ES W/KB NOD

5CB0Q79758

Upper Case B 81ES W/KB BEL

5CB0Q79741

Upper Case B 81ES W/KB SW

5CB0Q79720

Upper Case B 81ES W/KB USI

5CB0Q79743

Upper Case B 81ES W/KB ROM

5CB0Q79723

Upper Case B 81ES W/KB CZE

5CB0Q79757

Upper Case B 81ES W/KB POL

5CB0Q79726

Upper Case B 81ES W/KB POR

5CB0Q79728

WCM CP90307B2 D6.0 EMR Pen

5T70Q39587

2nd Camera 5M B 81ES

5C20Q79738

MBB 81ES N3450 4G32GEMMC UMANOK

5B20Q79762

MBB 81ES N3450 8G64GEMMC UMANOK

5B20Q79751

USB bracket(L+R) B 81ES

5B40Q79725

Upper case (with keyboard)

Stylus

Secondary camera

System board

USB brackets

Table 16. Part numbers for FRUs (CRUs) (continued)
7

WLAN & Bluetooth combo
module
Intel 7265 2x2AC+BT PCIE M.2 WLAN

SW10H24548

USB Board W/Cable B 81ES

5C50Q79756

SP/A L17M3PB0 11.25V42Wh3cellbty

5B10Q13163

LG L17L3PB0 11.4V42Wh3cellbty

5B10Q13162

Speaker(L+R) B 81ES

5SB0Q79732

D Cover B 81ES

5CB0Q79740

USB board

Battery pack

10 Speakers

11 Back cover

Note: Refer to Appendix C “Lenovo part numbers for CRUs and miscellaneous parts” on page 47 to look up
the Lenovo part numbers of ac power adapters and power cords.
Table 17. Part numbers for LCD FRUs
No. FRU (CRU) category
1

Spare parts description

Lenovo part number

LCDModuleW/sensor/EMR Film B81ES

5D10Q79736

Panel Rubber B 81ES

5R60Q79749

Strip Cover B 81ES

5CB0Q79752

Main Camera 720P B 81ES

5C20Q79760

Hinge(L+R)B 81ES

5H50Q79755

Hinge Rubber B 81ES

5R60Q79724

LCD Cable B 81ES

5C10Q79748

LCD Cover B 81ES

5CB0Q79742

Display module

Rubber

LCD strip cover

Camera

Hinges

Hinge rubbers

EDP cable

LCD base cover

Hardware Maintenance Manual

Appendix C. Lenovo part numbers for CRUs and
miscellaneous parts
Part numbers for power cords, ac adapters, screw pack and rubber pack are listed in the following table.
Note: The power cords and ac adapters are CRUs.
Table 18. Part numbers for FRUs (CRUs)
CRU category

Parts description

Lenovo part number

Screw Pack B 81ES

5S10Q79729

Panel Rubber B 81ES

5R60Q79749

Chicony PD 3.0 45W 3pin

SA10E75843

Liteon PD 3.0 45W 3pin

SA10E75841

Chicony PD 3.0 45W 2pin

SA10E75844

Liteon PD 3.0 45W 2pin

SA10E75842

Delta PD 3.0 45W 2pin

SA10E75840

LINETEK PC323+RVV300/300+LS15 1米电源线

145000600

LINETEK LS15+H03VV-F+LP39 1米电源线

145000599

LINETEK LS15+H03VV-F+LP-37 1米电源线

145000597

LINETEK LS15 H03VV-F LP26A 1米电源线

145000596

LINETEK LS15+H03VV-F+LP-41 1米电源线

145000595

LINETEK LP-30B + SPT-2 + LS15 1米电源线

145000594

LINETEK LP-61L+ H03VV-F+ LS15 1米电源线

145000593

LINETEK PE-361+ H05VV-F+ LS15 1米电源线

145000592

LINETEK LS15+H03VV-F+PE-336 1米电源线

145000591

LINETEK LS15+H05VV-F+LP-E04A 1米电源线

145000590

LINETEK LS15+H03VV-F+LP-23A 1米电源线

145000589

LINETEK LS15+VCTF+LP-53 1米电源线

145000588

LINETEK LS15+VCTF+LP-54 1米电源线

145000587

LINETEK LS15+H03VV-F+PE-364 1米电源线

145000586

LINETEK LP-34+H03VV-F + LS15 1米电源线

145000585

Longwell LSG-31+RVV300/300+LS-18 1米电源线

145000568

Longwell LP-24+H03VV-F+LS-18 1米电源线

145000567

Longwell LP-40+H03VV-F+LS-18 1米电源线

145000566

Screw pack

Rubber pack

ac power adapter

Power cord

Table 18. Part numbers for FRUs (CRUs) (continued)

Longwell LP-37+H03VV-F+LS-18 1米电源线

145000565

Longwell LP-46+H03VV-F+LS-18 1米电源线

145000564

Longwell LP-41+H03VV-F+LS-18 1米电源线

145000563

Longwell LP-30B+SPT-2 18AWG+LS-18 1米电源线

145000562

Longwell LP-61L+H03VV-F+LS-18 1米电源线

145000561

Longwell LP-67+BIS+LS-18 1米电源线

145000560

Longwell LP-22+H03VV-F+LS-18 1米电源线

145000559

Longwell LP-486+KTLH03VV-F+LS-5 1米电源线

145000558

Longwell LP-23A+LFC-3R+LS-18 1米电源线

145000557

Longwell LP-71+VCTF+LS-33 1米电源线

145000556

Longwell LP-54+VCTF+LS-18 1米电源线

145000555

Longwell LP-39+H03VV-F+LS-18 1米电源线

145000554

Longwell LP-34A+H03VV-F+LS-18 1米电源线

145000553

VOLEX GB10S3+RVV 300/500+VAC5S 1米电源线

145000538

Volex US15S3+SPT-2 ＋VAC5S 1米电源线

145000537

VOLEX MP5004+H03VV-F+VAC5S 1米电源线

145000605

VOLEX MP232+H03VV-F+VAC5S 1米电源线

145000524

VOLEX IT10S3+HO3VV-F+VAC5S 1米电源线

145000535

VOLEX MP233D+H03VV-F+VAC5S 1米电源线

145000534

VOLEX M2511+KETI IEC+VAC5S 1米电源线

145000533

VOLEX AU10S3+H03VV-F+VAC5S 1米电源线

145000532

VOLEX TW15CS3+VCTF+VAC5S 1米电源线

145000531

VOLEX VAC5S+VCTF+M755 1米电源线

145000530

VOLEX VA2073+H03VV-F+VAC5S 1米电源线

145000528

VOLEX CH10S3+H03VV-F+VAC5S 1米电源线

145000527

VOLEX SI16S3+H03VV-F+VAC5S 1米电源线

145000526

VOLEX M2511+HO3VV-F+VAC5S 1米电源线

145000525

lux 0036+RVV 300/300 0.75/3C+0002 1米电源线

145500003

lux 0040+H03VV-F 0.75/3C+0011 1米电源线

145500015

lux 0048+H03VV-F 0.75/3C+0011 1米电源线

145500014

lux 0027+H03VV-F 0.75/3C+0011 1米电源线

145500013

lux 0034+H03VV-F 0.75/3C+0011 1米电源线

145500011

lux 0041+H03VV-F 0.75/3C+0011 1米电源线

145500012

lux 0014+SPT-2 60℃ 18/3C+0016 1米电源线

145500002

lux 0014+H03VV-F 0.75/3C+0011 1米电源线

5L60J33143

lux 0031+H03VV-F 0.75/3C+0011 1米电源线

145500000

lux 0046+IS694 0.75/3C+0011 1米电源线

145500004

Hardware Maintenance Manual

Table 18. Part numbers for FRUs (CRUs) (continued)
lux 0029+H03VV-F 0.75/3C+0011 1米电源线

145500009

lux 0033+H03VV-F 0.75/3C+0011 1米电源线

145500008

lux 0038+H03VV-F 0.75/3C+0011 1米电源线

145500006

lux 0019+VCTF 0.75/3C+0021 1米电源线

145500007

lux 0018(E)+VCTF 0.75/3C+0021 1米电源线

145500005

lux 0044+H03VV-F 0.75/3C+0011 1米电源线

145500010

lux 0033+H03VV-F 0.75/3C+0011 1米电源线

145500001

LINETEK PC205+RVV 0.75/2C+LS7H 1米电源线

145500018

LINETEK LP40+H03VVH2-F+LS7H 1米电源线

145500030

LINETEK LP25+H03VVH2-F+LS7H 1米电源线

145500028

LINETEK LP45+H03VV-F+LS7H 1米电源线

145500029

LINETEK LP5+SPT-2 #18/2C+ LS7H 1米电源线

145500021

LINETEK LP61L+H03VVH2-F+ LS7H 1米电源线

145500019

LINETEK LP28+IS:694 0.75/2C+ LS7H 1米电源线

145500020

LINETEK LPE03A+H03VVH2-F+LS7H 1米电源线

145500025

LINETEK LP15A+H03VVH2-F+LS7H 1米电源线

145500023

LINETEK LP51A+VCTFK 0.75/2C+LS7H 1米电源线

145500027

LINETEK LP51A+HVCTFK 0.75/2C+LS7H 1米电源线

145500026

LINETEK PE364("O")+H03VVH2-F+LS7H 1米电源线

145500024

LINETEK LP21+H03VVH2-F+ LS7H 1米电源线

145500022

Longwell LSG-21+RVV300/300+LS-72 1米电源线

145500069

Longwell LP-16+H03VVH2-F+LS-7 1米电源线

145500070

Longwell LP-18A+H03VVH2-F+LS-18 1米电源线

145500071

Longwell LP-55+H03VVH2-F+LS-7 1米电源线

145500072

Longwell LP-11+SPT-2+LS-7C/7J 1米电源线

145500073

Longwell LP-61L+H03VVH2-F+ LS-7 1米电源线

145500074

Longwell LP-77+Longwell-p 2X+LS-7 1米电源线

145500075

Longwell LP-57+H03VVH2-F+LS-7KS 1米电源线

145500076

Longwell LP-15A+LFC-2F+LS-7 1米电源线

145500077

Longwell LP-70+VCTFK+LS-31 1米电源线

145500078

Longwell LP-51A+VCTFK+LS-7C/7J 1米电源线

145500079

Longwell LP-39+H03VVH2-F+LS-7 1米电源线

145500080

Longwell LP-21+ H03VVH2-F+LS-7 1米电源线

145500081

Lux 2pin 1M C7 cord Thailand type

5L60J39488

Appendix C. Lenovo part numbers for CRUs and miscellaneous parts

Hardware Maintenance Manual

Appendix D. Label locations

Figure 8. Label layout on the back side of the back cover

Labels attached to the base cover are country/region specific. If you need to replace the back cover of
customer's computer, apply the appropriate labels to the replacement back cover.
Table 19. All base cover labels
Label

Label description

Applied country/region

Label dimensions

Rating label

all

66 mm x 24 mm

Rating label (printed at factory)

all

43 mm x 24 mm

c�

Radio certification label
ICASA label

South Africa

20 mm x 10 mm

Israel label

Israel

32 mm x 10 mm

Anatel label

Brazil

35 mm x 5 mm

FCC/IC ID label

USA, Canada

32 mm x 10 mm

Malaysia label

Malaysia

8 mm x 8 mm

EU RED label

European Union

78 mm x 27 mm

Japan radio label

Japan

57 mm x 33 mm

Indonesia radio label

Indonesia

15 mm x 10 mm

Note: Radio certification labels are country/region specific. Only the certification label for the country/region
that the product is shipped is attached. Not all countries/regions include certification labels.

Hardware Maintenance Manual

Trademarks
Lenovo and the “lenovo” logo are trademarks of Lenovo in the United States, other countries or both:
Other company, product, or service names may be trademarks or service marks of others.

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