Lenovo 300e Chromebook 2nd Gen Owner's manual

Lenovo 300e/500e Chromebook 2nd Gen
Hardware Maintenance Manual

Note: Before usin this information and the product it supports, be sure to read the eneral information
under Appendix B “Notices” on pa e 51.
First Edition (January 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 anual . . . . . . . . . . . . iii
Chapter 1. Safety infor ation . . . . . . 1
General safety . . . . . . . . . . . . . . . . 1
Electrical safety . . . . . . . . . . . . . . . . 1
Safety inspection uide . . . . . . . . . . . . . 3
Handlin devices that are sensitive to electrostatic
dischar e . . . . . . . . . . . . . . . . . . 3
Groundin requirements . . . . . . . . . . . . 4
Safety notices (multilin ual translations) . . . . . . 4
Chapter 2. General checkout . . . . . 21
What to do first . . . . . . . . . . . . . . . 21
Power system checkout . . . . . . . . . . . 22
Checkin the ac power adapter . . . . . . . 22
Checkin the built-in battery and operational
char in . . . . . . . . . . . . . . . . 22
Chapter 3. Create and use a USB
repair shi . . . . . . . . . . . . . . . 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
Locatin FRUs and CRUs . . . . . . . . . . . 27
Major FRUs and CRUs . . . . . . . . . . 28
LCD FRUs . . . . . . . . . . . . . . . 30
Miscellaneous parts . . . . . . . . . . . 31
Lookin up FRU information . . . . . . . . . . 31
Chapter 5. Re oving or replacing a
FRU. . . . . . . . . . . . . . . . . . . 33
General uidelines . . . . . . . . . . . . . . 33
Disablin the built-in battery . . . . . . . . . . 34
1010 Electronic pen (for Lenovo 500e
Chromebook 2nd Gen only) . . . . . . . . . . 34
1020 Base cover assembly . . . . . . . . . . 34
1030 Built-in battery . . . . . . . . . . . . . 36
1040 Wireless LAN card . . . . . . . . . . . 37
1050 Speaker assembly . . . . . . . . . . . 38
1060 USB board with cable . . . . . . . . . . 39
1070 System board . . . . . . . . . . . . . 40
1080 World-Facin camera (for selected
models) . . . . . . . . . . . . . . . . . . 41
1090 Keyboard assembly . . . . . . . . . . . 42
Disassemble the LCD module . . . . . . . . . 44
2010 Strip cover and rubber caps . . . . . . 44
2020 LCD panel . . . . . . . . . . . . . 44
2030 Front camera . . . . . . . . . . . . 45
2040 LCD cable . . . . . . . . . . . . . 46
2050 LCD hin es . . . . . . . . . . . . 47
Appendix A. Controls, connectors,
and indicators . . . . . . . . . . . . . 49
Appendix B. Notices. . . . . . . . . . 51
© Copyri ht Lenovo 2020 i

ii Lenovo 300e/500e Chromebook 2nd Gen Hardware Maintenance Manual

About this anual
This manual contains service and reference information for the followin Lenovo products:
Lenovo 300e Chromebook 2nd Gen Machine type (MT) 81MB
Lenovo 500e Chromebook 2nd Gen Machine type (MT) 81MC
Use this manual alon with the advanced dia nostic tests to troubleshoot problems.
I portant:
This manual is intended only for trained service technicians who are familiar with Lenovo products. Use
this manual alon with the advanced dia nostic tests to troubleshoot problems effectively.
Before servicin a Lenovo product, be sure to read all the information under Chapter 1 “Safety
information” on pa e 1.
© Copyri ht Lenovo 2020 iii

iv Lenovo 300e/500e Chromebook 2nd Gen Hardware Maintenance Manual

Chapter 1. Safety infor ation
This chapter presents the followin safety information that you need to be familiar with before you service a
Chromebook.
• “General safety” on pa e 1
• “Electrical safety” on pa e 1
• “Safety inspection uide” on pa e 3
• “Handlin devices that are sensitive to electrostatic dischar e” on pa e 3
• “Groundin requirements” on pa e 4
• “Safety notices (multilin ual translations)” on pa e 4
General safety
Follow these rules to ensure eneral safety:
• Observe ood housekeepin in the area of the machines durin and after maintenance.
• When liftin any heavy object:
1. Ensure that you can stand safely without slippin .
2. Distribute the wei ht of the object equally between your feet.
3. Use a slow liftin force. Never move suddenly or twist when you attempt to lift.
4. Lift by standin or by pushin up with your le muscles; this action removes the strain from the
muscles in your back. Do not attempt to lift any object that wei hs more than 16 k (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 servicin the
machine.
• Keep your toolcase away from walk areas so that other people will not trip over it.
• Do not wear loose clothin that can be trapped in the movin parts of a machine. Ensure that your sleeves
are fastened or rolled up above your elbows. If your hair is lon , fasten it.
• Insert the ends of your necktie or scarf inside clothin or fasten it with a nonconductive clip, about 8
centimeters (3 inches) from the end.
• Do not wear jewelry, chains, metal-frame eye lasses, or metal fasteners for your clothin , because metal
objects are ood electrical conductors.
• Wear safety lasses when you are hammerin , drillin , solderin , cuttin wire, attachin sprin s, usin
solvents, or workin in any other conditions that mi ht be hazardous to your eyes.
• After service, reinstall all safety shields, uards, labels, and round wires. Replace any safety device that
is worn or defective.
• Reinstall all covers correctly before returnin the machine to the customer.
• Fan louvers on the machine help to prevent overheatin of internal components. Do not obstruct fan
louvers or cover them with labels or stickers.
Electrical safety
Observe the followin rules when workin on electrical equipment.
© Copyri ht Lenovo 2020 1

I portant:
• Use only approved tools and test equipment. Some hand tools have handles covered with a soft material
that does not insulate you when workin with live electrical currents.
• Many customers have, near their equipment, rubber floor mats that contain small conductive fibers to
decrease electrostatic dischar es (ESD). Do not use this type of mat to protect yourself from electrical
shock.
• Find the room emer ency power-off (EPO) switch, disconnectin switch, or electrical outlet. If an electrical
accident occurs, you can then operate the switch or unplu the power cord quickly.
• Do not work alone under hazardous conditions or near equipment that has hazardous volta es.
• Disconnect all power before:
– Performin a mechanical inspection
– Workin near power supplies
– Removin or installin main units
• Before you start to work on the machine, unplu the power cord. If you cannot unplu 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 followin 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 workin 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 co plete circuit. By observing the above rule,
you ay prevent a current fro passing through your body.
– When usin 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 rounds such as
metal floor strips and machine frames.
Observe the special safety precautions when you work with very hi h volta es. Instructions for these
precautions are in the safety sections of maintenance information. Use extreme care when measurin hi h
volta es.
• Re ularly 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 rounded power extension cables, power sur es, and missin safety rounds.
• Do not touch live electrical circuits with the reflective surface of a plastic dental mirror. The surface is
conductive; such touchin can cause personal injury and machine dama e.
• Do not service the followin parts with the power on:
– Power supply units
– Pumps
– Blowers and fans
– Motor enerators
– Units similar to those listed above
This practice ensures correct roundin of the units.
• If an electrical accident occurs:
– Use caution; do not become a victim yourself.
– Switch off power.
– Send another person to et medical aid.
2Lenovo 300e/500e Chromebook 2nd Gen Hardware Maintenance Manual

Safety inspection guide
The purpose of this inspection uide is to assist you in identifyin potentially unsafe conditions. As each
machine was desi ned and built, required safety items were installed to protect users and service
technicians from injury. This uide addresses only those items. You should use ood jud ment to identify
potential safety hazards due to attachment of non-Lenovo features or options not covered by this inspection
uide.
If any unsafe conditions are present, you must determine how serious the apparent hazard could be and
whether you can continue without first correctin the problem.
Consider these conditions and the safety hazards they present:
• Electrical hazards, especially primary power (primary volta e on the frame can cause serious or fatal
electrical shock)
• Explosive hazards, such as a dama ed CRT face or a bul in capacitor
• Mechanical hazards, such as loose or missin hardware
To determine whether there are any potentially unsafe conditions, use the followin checklist at the
be innin of every service task. Be in the checks with the power off, and the power cord disconnected.
Checklist:
1. Check exterior covers for dama e (loose, broken, or sharp ed es).
2. Turn off the computer. Disconnect the power cord.
3. Check the power cord for:
a. A third-wire round connector in ood condition. Use a meter to measure third-wire round
continuity for 0.1 ohm or less between the external round pin and the frame round.
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 bul in batteries.
5. Remove the cover.
6. Check for any obvious non-Lenovo alterations. Use ood jud ment as to the safety of any non-Lenovo
alterations.
7. Check inside the unit for any obvious unsafe conditions, such as metal filin s, contamination, water or
other liquids, or si ns of fire or smoke dama e.
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 containin transistors or inte rated circuits (ICs) should be considered sensitive to
electrostatic dischar e (ESD). ESD dama e can occur when there is a difference in char e between objects.
Protect a ainst ESD dama e by equalizin the char e so that the machine, the part, the work mat, and the
person handlin the part are all at the same char e.
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 handlin ESD-sensitive parts:
• Keep the parts in protective packa es until they are inserted into the product.
• Avoid contact with other people.
• Wear a rounded wrist strap a ainst your skin to eliminate static on your body.
• Prevent the part from touchin your clothin . Most clothin is insulative and retains a char e even when
you are wearin a wrist strap.
• Use a rounded work mat to provide a static-free work surface. The mat is especially useful when
handlin ESD-sensitive devices.
• Select a roundin system, such as those listed below, to provide protection that meets the specific
service requirement.
Note: The use of a roundin system to uard a ainst ESD dama e is desirable but not necessary.
– Attach the ESD round clip to any frame round, round braid, or reen-wire round.
– When workin on a double-insulated or battery-operated system, use an ESD common round or
reference point. You can use coax or connector-outside shells on these systems.
– Use the round round pron of the ac plu on ac-operated computers.
Grounding require ents
Electrical roundin of the computer is required for operator safety and correct system function. Proper
roundin of the electrical outlet can be verified by a certified electrician.
Safety notices ( ultilingual translations)
The safety notices in this section are provided in the followin lan ua es:
• En lish
• Arabic
• Brazilian Portu uese
• French
• German
• Hebrew
• Japanese
• Korean
• Spanish
• Traditional Chinese
DANGER
4Lenovo 300e/500e Chromebook 2nd Gen Hardware Maintenance Manual

DANGER
DANGER
DANGER
DANGER
DANGER
DANGER
Chapter 1.Safety information 5

DANGER
6Lenovo 300e/500e Chromebook 2nd Gen Hardware Maintenance Manual

PERIGO
Chapter 1.Safety information 7

PERIGO
PERIGO
PERIGO
PERIGO
8Lenovo 300e/500e Chromebook 2nd Gen Hardware Maintenance Manual

PERIGO
PERIGO
PERIGO
DANGER
DANGER
Chapter 1.Safety information 9

DANGER
DANGER
DANGER
DANGER
DANGER
10 Lenovo 300e/500e Chromebook 2nd Gen Hardware Maintenance Manual

DANGER
VORSICHT
VORSICHT
VORSICHT
VORSICHT
Chapter 1.Safety information 11

VORSICHT
VORSICHT
VORSICHT
VORSICHT
12 Lenovo 300e/500e Chromebook 2nd Gen Hardware Maintenance Manual

Chapter 1.Safety information 13

14 Lenovo 300e/500e Chromebook 2nd Gen Hardware Maintenance Manual