Table of Contents
- About this manual
- 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 or replacing a FRU
- General guidelines
- Disabling the built-in battery
- 1010 Base cover assembly
- 1020 Built-in battery
- 1030 Wireless LAN card
- 1040 Speaker assembly
- 1050 USB board brackets
- 1060 USB board assembly
- 1070 System board
- 1080 World-Facing camera (for selected models)
- 1090 Keyboard assembly
- Removing the LCD FRU (for Lenovo 100e Chromebook 2nd Gen AST)
- Removing the LCD FRU (for Lenovo 300e Chromebook 2nd Gen AST)
- Appendix A. Controls, connectors, and indicators
- Appendix B. Notices
Lenovo 300e User Manual
Displayed below is the user manual for 300e by Lenovo which is a product in the Notebooks category. This manual has pages.
Related Manuals
Lenovo 100e/300e Chromebook 2nd Gen AST
Hardware Maintenance Manual
Note: Before using this information and the product it supports, be sure to read the general information
under Appendix B “Notices” on page 61.
First Edition (March 2020)
© Copyright Lenovo 2020.
LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is delivered pursuant 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 manual . . . . . . . . . . . . iii
Chapter 1. Safety information . . . . . . 1
General safety . . . . . . . . . . . . . . . . 1
Electrical safety . . . . . . . . . . . . . . . . 1
Safety inspection guide . . . . . . . . . . . . . 3
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
Power system checkout . . . . . . . . . . . 22
Checking the ac power adapter . . . . . . . 22
Checking the built-in battery and operational
charging . . . . . . . . . . . . . . . . 22
Chapter 3. Create and use a USB
repair shim . . . . . . . . . . . . . . . 25
What is a USB repair shim? . . . . . . . . . . 25
Create a USB repair shim . . . . . . . . . . . 25
Use the USB repair shim . . . . . . . . . . . 26
Chapter 4. Identifying FRUs
(CRUs) . . . . . . . . . . . . . . . . . 27
Locating FRUs and CRUs . . . . . . . . . . . 27
Major FRUs and CRUs . . . . . . . . . . 28
LCD FRUs . . . . . . . . . . . . . . . 32
Miscellaneous parts . . . . . . . . . . . 35
Looking up FRU information . . . . . . . . . . 35
Chapter 5. Removing or replacing a
FRU. . . . . . . . . . . . . . . . . . . 37
General guidelines. . . . . . . . . . . . . . 37
Disabling the built-in battery . . . . . . . . . . 38
1010 Base cover assembly . . . . . . . . . . 38
1020 Built-in battery . . . . . . . . . . . . . 40
1030 Wireless LAN card . . . . . . . . . . . 41
1040 Speaker assembly . . . . . . . . . . . 43
1050 USB board brackets . . . . . . . . . . . 44
1060 USB board assembly . . . . . . . . . . 44
1070 System board . . . . . . . . . . . . . 45
1080 World-Facing camera (for selected
models) . . . . . . . . . . . . . . . . . . 47
1090 Keyboard assembly . . . . . . . . . . . 48
Removing the LCD FRU (for Lenovo 100e
Chromebook 2nd Gen AST) . . . . . . . . . . 50
2010 LCD bezel . . . . . . . . . . . . . 50
2020 LCD panel . . . . . . . . . . . . . 50
2030 Camera board . . . . . . . . . . . 51
2040 LCD hinges and LCD cable . . . . . . 52
Removing the LCD FRU (for Lenovo 300e
Chromebook 2nd Gen AST) . . . . . . . . . . 53
3010 Strip cover and rubber caps . . . . . . 53
3020 LCD panel . . . . . . . . . . . . . 54
3030 Front camera board . . . . . . . . . 54
3040 LCD cable . . . . . . . . . . . . . 55
3050 LCD hinges . . . . . . . . . . . . 56
Appendix A. Controls, connectors,
and indicators . . . . . . . . . . . . . 59
Appendix B. Notices. . . . . . . . . . 61
© Copyright Lenovo 2020 i
ii Lenovo 100e/300e Chromebook 2nd Gen AST Hardware Maintenance Manual
About this manual
This manual contains service and reference information for the following Lenovo products:
Lenovo 100e Chromebook 2nd Gen AST Machine type (MT) 82CD
Lenovo 300e Chromebook 2nd Gen AST Machine type (MT) 82CE
Use this manual along with the advanced diagnostic tests to troubleshoot problems.
Important:
• This manual is intended only for trained service technicians who are familiar with Lenovo products. Use
this manual along with the advanced diagnostic tests to troubleshoot problems effectively.
• Depending on the model, some hardware configuration and software programs might not be available on
the Chromebook™. Some statements in this manual might not be applicable to the Chromebook.
• Before servicing a Lenovo product, be sure to read all the information under Chapter 1 “Safety
information” on page 1.
© Copyright Lenovo 2020 iii
iv Lenovo 100e/300e Chromebook 2nd Gen AST 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
Chromebook.
• “General safety” on page 1
• “Electrical safety” on page 1
• “Safety inspection guide” on page 3
• “Handling devices that are sensitive to electrostatic discharge” on page 3
• “Grounding requirements” on page 4
• “Safety notices (multilingual translations)” on page 4
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. Ensure 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, ensure 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 toolcase 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. Ensure 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 nonconductive clip, about 8
centimeters (3 inches) from the end.
• Do not wear jewelry, chains, metal-frame eyeglasses, or metal fasteners for your clothing, because 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.
© Copyright Lenovo 2020 1
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 (ESD). 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. That 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.
CAUTION:
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,
nongrounded 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:
– Power supply units
– Pumps
– Blowers and fans
– Motor generators
– Units similar to those 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.
2Lenovo 100e/300e Chromebook 2nd Gen AST Hardware Maintenance Manual
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 CRT face or a bulging capacitor
• 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. Turn 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: https://
support.lenovo.com/partslookup.
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.
Chapter 1.Safety information 3
2. Ensure 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.
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
4Lenovo 100e/300e Chromebook 2nd Gen AST Hardware Maintenance Manual
DANGER
6Lenovo 100e/300e Chromebook 2nd Gen AST Hardware Maintenance Manual
PERIGO
PERIGO
PERIGO
PERIGO
8Lenovo 100e/300e Chromebook 2nd Gen AST Hardware Maintenance Manual
DANGER
DANGER
DANGER
DANGER
DANGER
10 Lenovo 100e/300e Chromebook 2nd Gen AST Hardware Maintenance Manual
VORSICHT
VORSICHT
VORSICHT
VORSICHT
12 Lenovo 100e/300e Chromebook 2nd Gen AST Hardware Maintenance Manual
14 Lenovo 100e/300e Chromebook 2nd Gen AST Hardware Maintenance Manual
16 Lenovo 100e/300e Chromebook 2nd Gen AST Hardware Maintenance Manual
18 Lenovo 100e/300e Chromebook 2nd Gen AST Hardware Maintenance Manual
20 Lenovo 100e/300e Chromebook 2nd Gen AST Hardware Maintenance Manual
Chapter 2. General checkout
This chapter presents the following information:
• “What to do first” on page 21
• “Power system checkout” on page 22
Some descriptions in this chapter might not apply to your particular computer.
Before you go to the checkout guide, be sure to 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, ensure that the model of
the machine and the FRU part number are correct.
• 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, ESD, 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 subject 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
© Copyright Lenovo 2020 21
• 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 PC Card or the installation of an incompatible card
• Diskette drive damage caused by pressure on the diskette drive cover, foreign material in the drive, or the
insertion of a diskette with multiple labels
• Damaged or bent diskette eject button
• Fuses blown by attachment of a nonsupported 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 nonwarranted 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.
Power system checkout
If you suspect a power problem, see the appropriate one of the following power supply checkouts:
• “Checking the ac power adapter” on page 22
• “Checking the built-in battery and operational charging” on page 22
Checking the ac power adapter
You are here because the computer fails only when the ac power adapter is used.
• If the system status indicator is not on when an ac power source is connected, check the power cord of
the ac power adapter for correct continuity and installation.
• If the computer does not charge during operation, go to “Checking the built-in battery and operational
charging” on page 22.
To check the ac power adapter, measure the output voltage across the plug of the ac power adapter cable to
see if the voltage is correct.
Notes:
• Noise from the ac power adapter does not always indicate a defect.
• Ensure that you use the ac power adapter that is shipped with the computer to provide enough power to
the computer. Otherwise, a message might be displayed, prompting you that the computer will not be
charged or will be charged slowly.
Checking the built-in battery and operational charging
This computer supports only batteries specially designed for this specific system and manufactured by
Lenovo or an authorized builder. The system does not support unauthorized batteries or batteries designed
for other systems. If an unauthorized battery or a battery designed for another systems is installed, the
system will not charge.
Attention: Lenovo has no responsibility for the performance or safety of unauthorized batteries, and
provides no warranties for failures or damage arising out of their use.
To check whether the battery charges properly during operation, do the following:
1. Discharge the battery until the remained battery power is less than 50%.
2. Connect the computer to ac power to charge the battery. If the battery status icon indicates that the
battery is not charging, remove the battery and let it return to room temperature.
3. Reinstall the battery. If the battery is still not charging, replace the battery.
22 Lenovo 100e/300e Chromebook 2nd Gen AST Hardware Maintenance Manual
24 Lenovo 100e/300e Chromebook 2nd Gen AST Hardware Maintenance Manual
Chapter 3. Create and use a USB repair shim
This chapter contains the following topics:
“What is a USB repair shim?” on page 25
“Create a USB repair shim” on page 25
“Use the USB repair shim” on page 26
What is a USB repair shim?
You can create a USB repair shim by writing a repair shim image to a USB storage drive. With the USB repair
shim, you can:
• Refresh the Chromebook system with the latest firmware.
• Diagnose problems and restore the system to factory settings.
Note: Before replacing any FRUs, use the USB repair shim to diagnose and identify problems.
When you use the USB repair shim to diagnose problems, the Chromebook enters the factory-test-image
environment and runs through the following factory test items.
Table 1. Factory test items
Test item Description
Final Functional Test (FFT)
The FFT is designed to test the function of individual component, such as the display,
audio, camera, and keyboard.
Some test items might require an HDMI™ monitor or SD card. If the devices are not
available, the tests can be bypassed. As a result, the overall test is marked as failed.
RunIn and FAT The RunIn and FAT are designed to test how the system functions under stress by
running the maximum workload. It takes about 10 minutes to finish.
Google Required Tests
(GRT)
The GRT is designed to check the system status and help reset the system back to
factory settings. If any test fails, the GRT has to be forced to end.
Create a USB repair shim
Step 1. Prepare a USB storage drive with at least 8 GB of storage capacity.
Attention: The creation process deletes anything stored on the USB storage drive. To avoid data
loss, backup all the data that you want to keep.
Step 2. Download the image file of the repair shim from https://support.lenovo.com. A Lenovo service
credential is required to download the image file.
Note: Make sure to download the latest version of the image file. A shim created with an earlier
version of the image file might cause the repair process to fail.
Step 3. Use a disk imaging tool to write the downloaded image to the USB storage drive. An open-source
tool Win32 Disk Imager is available at http://sourceforge.net/projects/win32diskimager.
© Copyright Lenovo 2020 25
Use the USB repair shim
Step 1. Remove the base cover assembly, disconnect the built-in battery from the system board, and then
attach the ac power adapter to the Chromebook.
Step 2. Press the power button together with esc and . The Chrome operating system recovery screen is
displayed. Then, Press Ctrl + D to enter to the developer mode after the operating system
verification screen is displayed.
Step 3. Press the power button together with esc and . Then, connect the prepared USB storage drive to
the Chromebook.
Step 4. Type I in the window prompted to install the shim image. The Chromebook will enter the factory-
test-image environment after the process is completed.
Step 5. Detach the ac power adapter, reconnect the built-in battery to the system board, and then reattach
the ac power adapter to the Chromebook.
Step 6. Remove the USB repair shim from the Chromebook and store it in a safe place.
Step 7. Follow the on-screen instructions to start the FFT.
Note: If the FFT detects a defective component, turn off the Chromebook, detach the ac power
adapter, and then replace the defective component.
Step 8. Start the RunIn and FAT (This is an optional operation.)
Step 9. Follow the on-screen instructions to start the GRT. If the tests finish successfully, all data stored on
the Chromebook is deleted and the Chromebook is turned off. If the GRT fails, it might result from
hardware identity (HWID) mismatch and write-protect malfunction. Use the following information to
identify problems.
Problem Description
HWID mismatch
A set of valid hardware identities (HWIDs) is provided by Google. Google logs
the exact hardware combination into a Chromebook and creates an HWID. The
HWID is used for the following purposes:
• Auto-update new patches and software for the lifetime of the Chromebook
• Reset the Chromebook to factory settings
HWID mismatch can be caused by using unauthorized or missing parts. If the
write-protect function is not turned off before recovering the Chromebook with
the USB repair shim, it can also cause HWID mismatch.
Write-protect
malfunction
The Chromebook system cannot be finalized until the write-protect function is
turned on.
Note: You can terminate the GRT when the tests have to be bypassed because they cannot be
performed. To end the process, press f.
26 Lenovo 100e/300e Chromebook 2nd Gen AST 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 28
“LCD FRUs” on page 32
“Miscellaneous parts” on page 35
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.
Chromebook contains 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 2020 27
Major FRUs and CRUs
Lenovo 100e Chromebook 2nd Gen AST
a
b
c
3
8
9
4
5
6
7
1
2
28 Lenovo 100e/300e Chromebook 2nd Gen AST Hardware Maintenance Manual
Note: Depending on the Chromebook model, your Chromebook might look different from the illustration
above.
Table 2. Major FRUs and CRUs
No. FRU description Self-service CRU Optional-service CRU
1LCD unit No No
2Keyboard assembly No No
3System board No No
4USB brackets No No
5Speaker assembly No No
6Built-in battery No No
7Base cover assembly No No
8Wireless LAN card No No
9USB board assembly No No
aMiscellaneous parts kits (See
“Miscellaneous parts” on page 35)
No No
bac power adapter Yes No
cPower cord Yes No
* for selected models
Chapter 4.Identifying FRUs (CRUs) 29
Lenovo 300e Chromebook 2nd Gen AST
a
b
c
3
9
10
4
5
6
7
1
2
8
30 Lenovo 100e/300e Chromebook 2nd Gen AST Hardware Maintenance Manual
Note: Depending on the Chromebook model, your Chromebook might look different from the illustration
above.
Table 3. Major FRUs and CRUs
No. FRU description Self-service CRU Optional-service CRU
1LCD unit No No
2Keyboard assembly No No
3System board No No
4USB brackets No No
5Speaker assembly No No
6Built-in battery No No
7Base cover assembly No No
8World-Facing camera with cable* No No
9Wireless LAN card No No
10 USB board assembly No No
aMiscellaneous parts kits (See
“Miscellaneous parts” on page 35)
No No
bac power adapter Yes No
cPower cord Yes No
Chapter 4.Identifying FRUs (CRUs) 31
LCD FRUs
Lenovo 100e Chromebook 2nd Gen AST
1
2
5
4
6
3
32 Lenovo 100e/300e Chromebook 2nd Gen AST Hardware Maintenance Manual
Lenovo 300e Chromebook 2nd Gen AST
1
2
3
4
5
6
7
8
34 Lenovo 100e/300e Chromebook 2nd Gen AST Hardware Maintenance Manual
Table 5. LCD FRUs and CRUs
No. FRU description Self-service CRU Optional-service CRU
1Screw rubbers No No
2Strip cover No No
3LCD panel No No
4Front camera board No No
5LCD cable No No
6LCD hinges No No
7Hinge caps No No
8LCD cover assembly No No
Miscellaneous parts
Table 6. Miscellaneous parts
FRU descriptions Self-service CRU Optional-service CRU
Screw pack:
Lenovo 100e Chromebook 2nd Gen AST
• Screw M2 x L3, black (17)
• Screw M2 x L4, black (16)
• Screw M2 x L2.5, black (2)
• Screw M2.5 x L5, black (6)
• Screw M1.6 x L1.5, silver (3)
• Screw M2.5 x L6, black (9)
• Spec
Lenovo 300e Chromebook 2nd Gen AST
• Screw M2 x L2.5, black (8)
• Screw M2 x L3, black (10)
• Screw M2 x L4, black (17)
• Screw M2.5 x L5, black (6)
• Screw M1.6 x L1.5, silver (3)
• Screw M2.5 x L6, black (9)
• Spec
No No
Looking up 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) 35
36 Lenovo 100e/300e Chromebook 2nd Gen AST Hardware Maintenance Manual
Chapter 5. Removing or replacing a FRU
This chapter provides instructions on how to remove or replace a FRU.
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.
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. If screws are missing, look up details in “Miscellaneous parts” on page 35 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.
© Copyright Lenovo 2020 37
• 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).
Disabling the built-in battery
Before replacing any FRU, ensure that you disable the built-in battery.
To disable the built-in battery, press together with the power button for about five seconds, and at the
same time detach the ac power adapter from the Chromebook.
Note: Power supply from the built-in battery will resume after you reconnect the Chromebook to the ac
power adapter.
1010 Base cover assembly
Removal steps of the base cover assembly
Loosen 9 screws that secure the base cover assembly.
Screw (quantity) Color
M2.5 × 6 mm, flat-head, nylon-coated (9) Black
38 Lenovo 100e/300e Chromebook 2nd Gen AST Hardware Maintenance Manual
Pry up latches and remove the base cover assembly.
Applying labels to the base cover assembly
Note: Depending on the country or region of delivery, the labels might be slightly different from the ones in
the following illustration.
The new base cover assembly FRU is shipped with a kit containing labels of several kinds. Apply those labels
when you replace the base cover assembly. For the labels that are not shipped with the new base cover
assembly, peel them from the old base cover assembly, and adhere them to the new one.
k
aa
b
c
d
e
fg
h
i
j
l
Table 7. All base cover labels
Label Label description Applied country/region Label dimensions
aSN label all 109 mm x 24 mm
bW/L label Argentina 68 mm x 6 mm
Chapter 5.Removing or replacing a FRU 39
Table 7. All base cover labels (continued)
cAdapter Label Argentina 65 mm x 20 mm
dTW vision warning label Taiwan 70 mm x 10 mm
eUS/CA/TW W/L label Taiwan 32 mm x 10 mm
fIndon rating label Indonesia 26 mm x 10 mm
gIndon SDPPI label Indonesia 15 mm x 10 mm
hW/L label Israel 32 mm x 10 mm
iIndia BIS label India 22 mm x 30 mm
jUS/CA/TW W/L label US/CA 32 mm x 10 mm
kMCMC label Malaysia 8 mm x 8 mm
lW/L label South Africa 20 mm x 10 mm
1020 Built-in battery
Important notice for replacing a battery
Attention: Lenovo has no responsibility for the performance or safety of unauthorized batteries, and provides no
warranties for failures or damage arising out of their use.
For access, remove this FRU in order:
• “1010 Base cover assembly” on page 38
Removal steps of the built-in battery
DANGER
Use only the authorized battery specified for your computer. Any other battery could ignite or
explode.
40 Lenovo 100e/300e Chromebook 2nd Gen AST Hardware Maintenance Manual
Screw (quantity) Color
M2 × 4 mm, flat-head, nylon-coated (4) Black
When installing:
• Ensure that the connectors are attached firmly.
• Ensure that the base cover assembly is attached firmly; otherwise, battery connection might fail.
1030 Wireless LAN card
For access, remove these FRUs in order:
• “1010 Base cover assembly” on page 38
Chapter 5.Removing or replacing a FRU 41
Removal steps of the wireless LAN card
Unplug the connectors by using the antenna RF connector removal tool or pick the connectors with your
fingers and gently unplug them as shown.
Screw (quantity) Color
M2 × 3 mm, flat-head, nylon-coated (1) Black
When installing: Plug the black cable into the main connector, and the white cable into the auxiliary
connector on the card.
42 Lenovo 100e/300e Chromebook 2nd Gen AST Hardware Maintenance Manual
1040 Speaker assembly
For access, remove these FRUs in order:
• “1010 Base cover assembly” on page 38
Removal steps of the speaker assembly
Screw (quantity) Color
M2 × 2.5 mm, flat-head, nylon-coated (2) Black
When installing: Ensure that the connector is attached firmly.
Chapter 5.Removing or replacing a FRU 43
1050 USB board brackets
For access, remove these FRUs in order:
• “1010 Base cover assembly” on page 38
Removal steps of the USB board brackets
Screw (quantity) Color
M2 × 4 mm, flat-head, nylon-coated (6) Black
When installing: Ensure that the connector is attached firmly.
1060 USB board assembly
For access, remove these FRUs in order:
• “1010 Base cover assembly” on page 38
• “1050 USB board brackets” on page 44
Removal steps of the USB board assembly
44 Lenovo 100e/300e Chromebook 2nd Gen AST Hardware Maintenance Manual
Screw (quantity) Color
M2 × 4 mm, flat-head, nylon-coated (1) Black
When installing: Ensure that the connector is attached firmly.
1070 System board
For access, remove these FRUs in order:
• “1010 Base cover assembly” on page 38
• “1020 Built-in battery” on page 40
• “1030 Wireless LAN card” on page 41
• “1040 Speaker assembly” on page 43
• “1050 USB board brackets” on page 44
• “1060 USB board assembly” on page 44
Chapter 5.Removing or replacing a FRU 45
Lenovo 100e Chromebook 2nd Gen AST
Screw (quantity) Color
M2 × 4 mm, flat-head, nylon-coated (5) Black
When installing: Ensure that the connectors are attached firmly.
46 Lenovo 100e/300e Chromebook 2nd Gen AST Hardware Maintenance Manual
Lenovo 300e Chromebook 2nd Gen AST
Screw (quantity) Color
M2 × 4 mm, flat-head, nylon-coated (6) Black
1080 World-Facing camera (for selected models)
For access, remove these FRUs in order:
• “1010 Base cover assembly” on page 38
• “1020 Built-in battery” on page 40
• “1030 Wireless LAN card” on page 41
• “1040 Speaker assembly” on page 43
• “1050 USB board brackets” on page 44
Chapter 5.Removing or replacing a FRU 47
• “1060 USB board assembly” on page 44
• “1070 System board” on page 45
Removal steps of the World-Facing camera
1090 Keyboard assembly
For access, remove these FRUs in order:
• “1010 Base cover assembly” on page 38
• “1020 Built-in battery” on page 40
• “1030 Wireless LAN card” on page 41
• “1040 Speaker assembly” on page 43
• “1050 USB board brackets” on page 44
• “1060 USB board assembly” on page 44
• “1070 System board” on page 45
• “1080 World-Facing camera (for selected models)” on page 47
48 Lenovo 100e/300e Chromebook 2nd Gen AST Hardware Maintenance Manual
Removing the LCD FRU (for Lenovo 100e Chromebook 2nd Gen AST)
2010 LCD bezel
Removal step of the LCD bezel
When installing: Ensure that all the latches are attached firmly.
2020 LCD panel
For access, remove this FRU:
• “2010 LCD bezel” on page 50
Removal steps of the LCD panel
50 Lenovo 100e/300e Chromebook 2nd Gen AST Hardware Maintenance Manual
Screw (quantity) Color
M2 × 3 mm, flat-head, nylon-coated (4) Black
When installing: Ensure that the LCD connector is attached firmly.
2030 Camera board
For access, remove these FRUs in order:
• “2010 LCD bezel” on page 50
• “2020 LCD panel” on page 50
Removal steps of the camera board
When installing: Ensure that the connector is attached firmly.
Chapter 5.Removing or replacing a FRU 51
2040 LCD hinges and LCD cable
For access, remove these FRUs in order:
• “2010 LCD bezel” on page 50
• “2020 LCD panel” on page 50
• “2030 Camera board” on page 51
Removal steps of the LCD hinges and LCD cable
Screw (quantity) Color
M2 × 3mm, flat-head, nylon-coated (10) Black
52 Lenovo 100e/300e Chromebook 2nd Gen AST Hardware Maintenance Manual
Removing the LCD FRU (for Lenovo 300e Chromebook 2nd Gen AST)
3010 Strip cover and rubber caps
Removal step of the strip cover and rubber caps
Screw (quantity) Color
M2 × 3 mm, flat-head, nylon-coated (2) Black
When installing: Ensure that all the latches are attached firmly.
Chapter 5.Removing or replacing a FRU 53
3020 LCD panel
For access, remove this FRU:
• “3010 Strip cover and rubber caps” on page 53
Removal steps of the LCD panel
Screw (quantity) Color
M2 × 3 mm, flat-head, nylon-coated (3) Black
When installing: Ensure that the LCD connector is attached firmly.
3030 Front camera board
For access, remove these FRUs in order:
• “3010 Strip cover and rubber caps” on page 53
54 Lenovo 100e/300e Chromebook 2nd Gen AST Hardware Maintenance Manual
• “3020 LCD panel” on page 54
Removal steps of the front camera board
When installing: Ensure that the connector is attached firmly.
3040 LCD cable
For access, remove these FRUs in order:
• “3010 Strip cover and rubber caps” on page 53
• “3020 LCD panel” on page 54
• “3030 Front camera board” on page 54
Chapter 5.Removing or replacing a FRU 55
Removal steps of the LCD cable
3050 LCD hinges
For access, remove these FRUs:
• “3010 Strip cover and rubber caps” on page 53
• “3020 LCD panel” on page 54
• “3030 Front camera board” on page 54
• “3040 LCD cable” on page 55
Removal steps of the LCD hinges
a
a
b
b
56 Lenovo 100e/300e Chromebook 2nd Gen AST Hardware Maintenance Manual
58 Lenovo 100e/300e Chromebook 2nd Gen AST Hardware Maintenance Manual
Appendix A. Controls, connectors, and indicators
Lenovo 100e Chromebook 2nd Gen AST
2 31
8
9
10
11
12
13
6
7
5
4
Table 8. Controls, connectors, and indicators
No. Control, connector, or indicator
1Front camera light
2Front camera
3Microphone
4Power button
5Mini security-lock slot
6USB-C™ connector
7USB 3.2 connector Gen 1
8Touchpad
9Audio connector
10 microSD card slot
11 USB 3.2 connector Gen 1
12 Power connector / USB-C connector
13 Power status indicator
© Copyright Lenovo 2020 59
Lenovo 300e Chromebook 2nd Gen AST
2 31
12
13
14
15
16
17
9
10
11
8
7
5 6
4
Table 9. Controls, connectors, and indicators
No. Control, connector, or indicator
1Front camera light
2Front camera
3Microphone
4World-Facing camera*
5World-Facing camera light*
6Microphone*
7Mini security-lock slot
8USB-C™ connector
9USB 3.2 connector Gen 1
10 Power button
11 Volume button
12 Touchpad
13 Audio connector
14 microSD card slot
15 USB 3.2 connector Gen 1
16 Power connector / USB-C connector
17 Power status indicator
* for selected models
60 Lenovo 100e/300e Chromebook 2nd Gen AST Hardware Maintenance Manual
Appendix B. Notices
Lenovo may not offer the products, services, or features discussed in this document in all countries. Consult
your local Lenovo representative for information on the products and services currently available in your
area. Any reference to a Lenovo product, program, or service is not intended to state or imply that only that
Lenovo product, program, or service may be used. Any functionally equivalent product, program, or service
that does not infringe any Lenovo intellectual property right may be used instead. However, it is the user’s
responsibility to evaluate and verify the operation of any other product, program, or service.
Lenovo may have patents or pending patent applications covering subject matter described in this
document. The furnishing of this document does not give you any license to these patents. You can send
license inquiries, in writing, to:
Lenovo (United States), Inc.
8001 Development Drive
Morrisville, NC 27560
U.S.A.
Attention: Lenovo Director of Licensing
LENOVO PROVIDES THIS PUBLICATION “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF NON-INFRINGEMENT,
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Some jurisdictions do not allow
disclaimer of express or implied warranties in certain transactions, therefore, this statement may not apply to
you.
This information could include technical inaccuracies or typographical errors. Changes are periodically made
to the information herein; these changes will be incorporated in new editions of the publication. Lenovo may
make improvements and/or changes in the product(s) and/or the program(s) described in this publication at
any time without notice.
The products described in this document are not intended for use in implantation or other life support
applications where malfunction may result in injury or death to persons. The information contained in this
document does not affect or change Lenovo product specifications or warranties. Nothing in this document
shall operate as an express or implied license or indemnity under the intellectual property rights of Lenovo or
third parties. All information contained in this document was obtained in specific environments and is
presented as an illustration. The result obtained in other operating environments may vary.
Lenovo may use or distribute any of the information you supply in any way it believes appropriate without
incurring any obligation to you.
Any references in this publication to non-Lenovo Web sites are provided for convenience only and do not in
any manner serve as an endorsement of those Web sites. The materials at those Web sites are not part of the
materials for this Lenovo product, and use of those Web sites is at your own risk.
Any performance data contained herein was determined in a controlled environment. Therefore, the result
obtained in other operating environments may vary significantly. Some measurements may have been made
on development-level systems and there is no guarantee that these measurements will be the same on
generally available systems. Furthermore, some measurements may have been estimated through
extrapolation. Actual results may vary. Users of this document should verify the applicable data for their
specific environment.
© Copyright Lenovo 2020 61
Electromagnetic emission notices
For electromagnetic emission information on Class B digital devices, refer to the corresponding information
in the User Guide.
EU Contact: Lenovo (Slovakia), Landererova 12, 811 09 Bratislava, Slovakia
Trademarks
LENOVO and the LENOVO logo are trademarks of Lenovo. The terms HDMI and HDMI High-Definition
Multimedia Interface are trademarks or registered trademarks of HDMI Licensing LLC in the United States
and other countries. USB-C is a trademark of USB Implementers Forum. All other trademarks are the
property of their respective owners. © 2020 Lenovo.
62 Lenovo 100e/300e Chromebook 2nd Gen AST Hardware Maintenance Manual
Part Number: SP40W87578
Printed in China
(1P) P/N: SP40W87578
*1PSP40W87578*