Lenovo 20L3000LIX Owner's manual

Lenovo Tablet 10
Hardware Maintenance Manual

Note: Before using this information and the product it supports, be sure to read the general information
under Appendix A Notices” on page 69.
First Edition (February 2018)
© Copyright Lenovo 2018.
LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is delivered pursuant to a General Services
Administration GSA” contract, use, reproduction, or disclosure is subject to restrictions set forth in Contract No. GS-
35F-05925.

Contents
bout 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. Important service
information . . . . . . . . . . . . . . . 21
Strategy for replacing FRUs . . . . . . . . . . 21
Important notice for replacing a system
board . . . . . . . . . . . . . . . . . 21
How to use error message . . . . . . . . . 22
Strategy for replacing FRUs for CTO, special bid
model, and standard models. . . . . . . . . . 22
Product definition . . . . . . . . . . . . 22
FRU identification . . . . . . . . . . . . 22
Chapter 3. General checkout . . . . . 25
What to do first . . . . . . . . . . . . . . . 25
Checkout guide . . . . . . . . . . . . . . . 26
Lenovo Companion or Lenovo Vantage. . . . 26
Quick test programs . . . . . . . . . . . 26
UEFI diagnostic program . . . . . . . . . 27
Bootable diagnostic programs . . . . . . . 27
Power system checkout . . . . . . . . . . . 28
Checking the built-in battery . . . . . . . . 28
Checking the operational charging . . . . . 29
Checking the ac power adapter . . . . . . . 29
Chapter 4. Related service
information . . . . . . . . . . . . . . . 31
Windows recovery apps . . . . . . . . . . . 31
Resetting your computer . . . . . . . . . 31
Recovering your operating system if Windows
10 fails to start . . . . . . . . . . . . . 31
Creating and using a recovery USB drive . . . 31
Lenovo factory recovery USB key . . . . . . . . 32
Using passwords . . . . . . . . . . . . . . 33
Symptom-to-FRU index . . . . . . . . . . . 33
Error codes. . . . . . . . . . . . . . . 34
Beep errors. . . . . . . . . . . . . . . 35
Intermittent problems . . . . . . . . . . . 36
Undetermined problems . . . . . . . . . 36
Chapter 5. Locations . . . . . . . . . 39
Connectors and indicators . . . . . . . . . . 39
Locating FRUs and CRUs . . . . . . . . . . . 41
Major FRUs . . . . . . . . . . . . . . 42
Other parts . . . . . . . . . . . . . . . 43
Connector and cable guide . . . . . . . . 43
Looking up FRU information . . . . . . . . . . 45
Chapter 6. FRU replacement
notices . . . . . . . . . . . . . . . . . 47
Screw notices . . . . . . . . . . . . . . . 47
Retaining serial numbers . . . . . . . . . . . 48
Chapter 7. Removing or replacing a
FRU. . . . . . . . . . . . . . . . . . . 49
General guidelines. . . . . . . . . . . . . . 49
Before servicing the computer . . . . . . . . . 50
Disabling the built-in battery . . . . . . . . 50
Removing the Integrated Active Pen . . . . . 50
Removing the Nano-SIM-card and microSD
card tray, nano-SIM-card, and microSD
card . . . . . . . . . . . . . . . . . 50
1010 Back cover assembly . . . . . . . . . . 51
1020 Built-in battery . . . . . . . . . . . . . 52
1030 Wireless-LAN module . . . . . . . . . . 53
1040 Wireless-WAN card . . . . . . . . . . . 54
1050 Speaker assembly . . . . . . . . . . . 55
1060 POGO cable . . . . . . . . . . . . . . 56
1070 LCD FPC . . . . . . . . . . . . . . . 57
1080 NFC board, NFC-board cable, and NFC
antenna assembly . . . . . . . . . . . . . . 57
1090 Camera module and camera cable . . . . . 59
1100 Thermal module . . . . . . . . . . . . 60
1110 System board . . . . . . . . . . . . . 61
1120 Fingerprint reader and cable . . . . . . . 63
1130 USB-C connector bracket . . . . . . . . 65
1140 Pen board and cable . . . . . . . . . . 66
1150 LCD panel with antenna kit . . . . . . . . 67
1160 Magnets . . . . . . . . . . . . . . . 68
ppendix . Notices . . . . . . . . . . 69
Electronic emission notices . . . . . . . . . . 70
Trademarks . . . . . . . . . . . . . . . . 70
ppendix B. bbreviation and
acronym table . . . . . . . . . . . . . 71
© Copyright Lenovo 2018 i

ii Lenovo Tablet 10 Hardware Maintenance Manual

bout this manual
This manual contains service and reference information for the following products.
Machine Machine type (MT)
Lenovo Tablet 10 20L3 and 20L4
Important:
• This manual is intended only for trained service technicians who are familiar with the products. Use this
manual along with the advanced diagnostic tests to troubleshoot problems effectively.
• Before servicing a product, be sure to read all the information under Chapter 1 Safety information” on
page 1 and Chapter 2 Important service information” on page 21.
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iv Lenovo Tablet 10 Hardware Maintenance Manual

Chapter 1. Safety information
This chapter presents following safety information that you should be familiar with before you service a
computer.
• 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. 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 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. 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 nonconductive clip, about 8
centimeters (3 inches) from the end.
• Do not wear jewelry, chains, metal-frame eyeglasses, or metal fasteners for your clothing.
ttention: Metal objects are good electrical conductors.
• Wear safety glasses when you are working in conditions that might be hazardous to your eyes. The
conditions include hammering, drilling, soldering, cutting wire, attaching springs, using solvents, and so
on.
• After service, reinstall all safety shields, guards, labels, and ground wires. Replace any safety device that
is worn or defective.
• Reinstall other parts that you have removed.
Electrical safety
Observe the following rules when working on electrical equipment.
© Copyright Lenovo 2018 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. 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 disconnect 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, disconnect the power cord. If you cannot unplug it, power off the
wall box that supplies power to the machine, and lock the wall box in the off position.
• If you work on a machine that has e posed electrical circuits, observe the following precautions:
– Ensure that another person, familiar with the power-off controls, is near you.
ttention: 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.
ttention: 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 when they are removed from their normal operating
places in a machine:
– Power supply units
– Pumps
– Motor generators
– Similar units to 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 Tablet 10 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.
3. Disable the built-in battery. For the instruction on how to disable the built-in battery, see Disabling the
built-in battery” on page 50.
4. Disconnect the power cord.
5. Check the power cord for the following:
a. Make sure that a third-wire ground connector is in good condition. Use a meter to measure the third-
wire ground continuity. Ensure that the continuity between the external ground pin and the frame
ground is 0.1 ohm or less.
b. The power cord is the type specified in the parts list.
c. Insulation is not frayed or worn.
6. Remove the LCD module assembly.
7. Check for cracked or bulging built-in batteries.
8. Check for any obvious non-Lenovo alterations. Use good judgment as to the safety of any non-Lenovo
alterations.
9. 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.
10. Check for worn, frayed, or pinched cables.
11. Check that the built-in battery 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.
Chapter 1.Safety information 3

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.
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
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