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T480s Hardware Maintenance Manual

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T480s Hardware Maintenance Manual - Lenovo

About this manual. This manual contains service and reference information for the following ThinkPad products. ThinkPad T480s. Machine Types (MT) 20L7, ...

2. Follow the instructions on the screen to select a product. 3. Click the Product & Parts tab. 4. Select System Service Parts to view a general FRU list View

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T480s 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 101.
Second Edition (September 2020) � Copyright Lenovo 2018, 2020. 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. GS35F-05925.

Contents

About this manual . . . . . . . . . . . .iii
Chapter 1. Safety information . . . . . . 1
General safety . . . . . . . . . . . . . . . . 1 Electrical safety . . . . . . . . . . . . . . . . 1 Safety inspection guide . . . . . . . . . . . . . 2 Handling devices that are sensitive to electrostatic discharge . . . . . . . . . . . . . . . . . . 3 Grounding requirements . . . . . . . . . . . . 4 Safety notices (multilingual translations) . . . . . . 4
Chapter 2. Important service information . . . . . . . . . . . . . . . 21
Strategy for replacing FRUs . . . . . . . . . . 21 Strategy for replacing a solid-state drive . . . 21 Important notice for replacing a system board . . . . . . . . . . . . . . . . . 22 How to use error message . . . . . . . . . 22
Strategy for replacing FRUs for CTO, special-bid, and standard models. . . . . . . . . . . . . 22
Product definition . . . . . . . . . . . . 22 FRU identification . . . . . . . . . . . . 22
Chapter 3. General checkout . . . . . 25
What to do first . . . . . . . . . . . . . . . 25 Checkout guide . . . . . . . . . . . . . . . 26
Diagnosing problems . . . . . . . . . . . 26 Quick test programs . . . . . . . . . . . 27 UEFI diagnostic program . . . . . . . . . 27 Bootable diagnostic programs . . . . . . . 27 Power system checkout . . . . . . . . . . . 28 Checking the ac power adapter . . . . . . . 28 Checking the built-in battery and operational charging . . . . . . . . . . . . . . . . 29 Checking the coin-cell battery . . . . . . . 29
Chapter 4. Related service information . . . . . . . . . . . . . . . 31
Recovery information for the Windows 10 operating system . . . . . . . . . . . . . . 31
Resetting your computer . . . . . . . . . 31 Using advanced startup options . . . . . . 31 Recovering your operating system if Windows 10 fails to start . . . . . . . . . . . . . 31 Creating and using a recovery USB drive . . . 32 Passwords. . . . . . . . . . . . . . . . . 32 Power-on password . . . . . . . . . . . 33 Hard disk password . . . . . . . . . . . 33 Supervisor password . . . . . . . . . . . 33
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How to remove the power-on password . . . 33 How to remove the hard disk password. . . . 34 Power management . . . . . . . . . . . . . 34 Sleep mode . . . . . . . . . . . . . . 35 Hibernation mode . . . . . . . . . . . . 35 Symptom-to-FRU index . . . . . . . . . . . 35 Numeric error codes . . . . . . . . . . . 36 Error messages . . . . . . . . . . . . . 37 Beep symptoms . . . . . . . . . . . . . 38 No-beep symptoms . . . . . . . . . . . 39 LCD-related symptoms . . . . . . . . . . 39 Intermittent problems . . . . . . . . . . . 40 Undetermined problems . . . . . . . . . 40
Chapter 5. Function keys . . . . . . . 41
Chapter 6. Locations . . . . . . . . . 43
Locating computer controls, connectors, and indicators . . . . . . . . . . . . . . . . . 43
Front view . . . . . . . . . . . . . . . 43 Right-side view . . . . . . . . . . . . . 44 Left-side view . . . . . . . . . . . . . . 44 Bottom view . . . . . . . . . . . . . . 44 Rear view . . . . . . . . . . . . . . . 45 Status indicators . . . . . . . . . . . . 45 Locating FRUs and CRUs . . . . . . . . . . . 46 Major FRUs . . . . . . . . . . . . . . 48 LCD FRUs . . . . . . . . . . . . . . . 51 Miscellaneous parts . . . . . . . . . . . 52 Connector and cable guide . . . . . . . . 52 Looking up FRU information . . . . . . . . . . 56
Chapter 7. FRU replacement notices . . . . . . . . . . . . . . . . . 57
Screw notices . . . . . . . . . . . . . . . 57 Retaining serial numbers . . . . . . . . . . . 58
Restoring the serial number of the system unit . . . . . . . . . . . . . . . . . . 58 Retaining the UUID. . . . . . . . . . . . 59 Reading or writing the ECA information . . . . 59
Chapter 8. Removing or replacing a FRU. . . . . . . . . . . . . . . . . . . 61
General guidelines. . . . . . . . . . . . . . 61 Before servicing the computer . . . . . . . . . 62
Disabling the built-in battery . . . . . . . . 62 Removing the nano-SIM card and nano-SIMcard tray . . . . . . . . . . . . . . . . 62
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Removing a major FRU . . . . . . . . . . . . 62 1010 Keyboard . . . . . . . . . . . . . 63 1020 Base cover assembly . . . . . . . . 67 1030 Wireless LAN card . . . . . . . . . . 69 1040 Wireless WAN card . . . . . . . . . 69 1050 M.2 solid-state drive . . . . . . . . . 70 1060 Memory module . . . . . . . . . . 71 1070 Ethernet connector drop-down door. . . 72 1080 Thermal fan assembly . . . . . . . . 72 1090 USB subcard assembly. . . . . . . . 73 1100 Built-in battery . . . . . . . . . . . 74 1110 Coin-cell battery . . . . . . . . . . 76 1120 Speaker assembly . . . . . . . . . . 76 1130 Smart card reader assembly or dummy smart card reader . . . . . . . . . . . . 77 1140 SD card reader and audio subcard assembly . . . . . . . . . . . . . . . 79 1150 Fingerprint reader and smart card reader cable . . . . . . . . . . . . . . . . . 80 1160 Hall sensor and hall sensor cable . . . . 81 1170 Trackpad cable and trackpad . . . . . 82

1180 NFC cable and NFC module . . . . . . 84 1190 System board . . . . . . . . . . . 85 1200 dc-in cable and power button card . . . 88 1210 LCD unit . . . . . . . . . . . . . 89 1220 Keyboard bezel assembly . . . . . . . 92 Removing an LCD FRU . . . . . . . . . . . . 93 2010 LCD bezel sheet and LCD bezel . . . . 93 2020 LCD panel and LCD cable assembly. . . 93 2030 Hinge kit . . . . . . . . . . . . . 94 2040 ThinkShutter, camera card, and LED/ camera cable (for models with only conventional camera) . . . . . . . . . . . 95 2050 Camera card and LED/camera cable (for models with infrared camera) . . . . . . . . 97 2060 Antenna kit . . . . . . . . . . . . 98 2070 LCD rear cover assembly . . . . . . . 100
Appendix A. Notices . . . . . . . . . .101
Appendix B. Abbreviation table . . . .103

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About this manual

This manual contains service and reference information for the following ThinkPad� products.

ThinkPad T480s

Machine Types (MT) 20L7, 20L8

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 ThinkPad products. Use this manual along with the advanced diagnostic tests to troubleshoot problems effectively. Before servicing a ThinkPad 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.

� Copyright Lenovo 2018, 2020

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Chapter 1. Safety information
This chapter presents following safety information that you need to be familiar with before you service a ThinkPad notebook computer. � "General safety" on page 1 � "Electrical safety" on page 1 � "Safety inspection guide" on page 2 � "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.
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.

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� 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, 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 � 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-ThinkPad 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.
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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. 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: 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-ThinkPad alterations. Use good judgment as to the safety of any nonThinkPad 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.
Chapter 1. Safety information 3

� 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
DANGER
DANGER
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DANGER DANGER DANGER DANGER DANGER

Chapter 1. Safety information 5

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PERIGO PERIGO

Chapter 1. Safety information 7

PERIGO PERIGO
PERIGO PERIGO PERIGO 8 T480s Hardware Maintenance Manual

PERIGO DANGER DANGER DANGER DANGER

Chapter 1. Safety information 9

DANGER DANGER DANGER DANGER
VORSICHT 10 T480s Hardware Maintenance Manual

VORSICHT VORSICHT VORSICHT VORSICHT

Chapter 1. Safety information 11

VORSICHT VORSICHT VORSICHT
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Chapter 1. Safety information 13

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Chapter 1. Safety information 15

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Chapter 1. Safety information 17

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Chapter 1. Safety information 19

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Chapter 2. Important service information
This chapter introduces following important service information that applies to all machine types supported by this manual: � "Strategy for replacing FRUs" on page 21
� "Strategy for replacing a solid-state drive" on page 21 � "Important notice for replacing a system board" on page 22 � "How to use error message" on page 22 � "Strategy for replacing FRUs for CTO, special-bid, and standard models" on page 22 � "Product definition" on page 22 � "FRU identification" on page 22
Important: � Advise customers to contact the Lenovo� Customer Support Center if they need any assistance in
obtaining or installing any software fixes, drivers, and UEFI BIOS downloads. Telephone numbers for Lenovo Support are available at: https://pcsupport.lenovo.com/supportphonelist � System Disassembly/Reassembly videos that show the FRU removals or replacements for the Lenovo authorized service technicians are available in the following support site: https://www.lenovoservicetraining.com/ion/
Strategy for replacing FRUs
Before replacing parts:
Ensure that all software fixes, drivers, and UEFI BIOS downloads are installed before replacing any FRUs listed in this manual.
After a system board is replaced, ensure that the latest UEFI BIOS is loaded to the system board before completing the service action.
To download software fixes, drivers, and UEFI BIOS, go to https://support.lenovo.com and follow the instructions on the screen.
Use the following strategy to prevent unnecessary expense for replacing and servicing FRUs: � If you are instructed to replace a FRU but the replacement does not correct the problem, reinstall the
original FRU before you continue. � Some computers have both a processor board and a system board. If you are instructed to replace either
the processor board or the system board, and replacing one of them does not correct the problem, reinstall that board, and then replace the other one. � If an adapter or a device consists of more than one FRU, any of the FRUs may be the cause of the error. Before replacing the adapter or device, remove the FRUs, one by one, to see if the symptoms change. Replace only the FRU that changed the symptoms.
Strategy for replacing a solid-state drive
Always try to run a low-level format before replacing a solid-state drive. This will cause all customer data on the drive to be lost. Be sure that the customer has a current backup of the data before doing this task.
Attention: The drive startup sequence in the computer you are servicing may have been changed. Be extremely careful during write operations such as copying, saving, or formatting. If you select an incorrect drive, data or programs can be overwritten.

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Important notice for replacing a system board
Some components mounted on a system board are very sensitive. Improper handling of a system board can cause damage to those components, and may cause a system malfunction.
Attention: When handling a system board: � Do not drop a system board or apply any excessive force to it. � Avoid rough handling of any kind. � Avoid bending a system board and hard pushing to prevent cracking at each BGA (Ball Grid Array)
chipset.
How to use error message
Use the error codes displayed on the screen to diagnose failures. If more than one error code is displayed, begin the diagnosis with the first error code. Whatever causes the first error code may also cause false error codes. If no error code is displayed, see whether the error symptom is listed in the Symptom-to-FRU Index for the computer you are servicing.
Strategy for replacing FRUs for CTO, special-bid, and standard models
This topic provides information about the model types and FRU identification.
Product definition
This topic introduces different model types and how to identify each type.
Dynamic Configure To Order (CTO) model This model provides the ability for a customer to configure a Lenovo solution from a Web Site, and have this configuration sent to fulfillment, where it is built and shipped directly to the customer. The machine label and eSupport will load these products as the 4-character MT, 4-character model, and 2-character country code. The model is "CTO1" and the default country code is "WW" (example: 20AACTO1WW).
Special-bid model This is a unique configuration that has been negotiated between Lenovo and the customer. A unique MTM consists of a 4-character MT, a 4-character model, and a numeric 2-character country code is provided to the customer to place orders (example: 20AA000955). The country code assigned is numeric and does not designate a specific country or region. The custom model factsheet for the MTM indicates which country the special bid MTM is set up for. Special-bid offering is not generally announced.
Standard model Standard models (fixed configuration) are announced and offered to all customers. The MTM portion of the machine label consists of a 4-character MT, a 4-character model, and an alphabetic 2-character country code. The country code assigned is alphabetic and represents a designated country or region (example: 20AA0009UK).
FRU identification
Use Lenovo eSupport to identify major FRUs, FRU part numbers, and FRU descriptions for a product at an MT - serial number level. Examples of major FRUs are solid-state drive, system board, and liquid crystal display (LCD).
To identify the major FRUs for a product, do the following: 1. Go to https://support.lenovo.com/partslookup. 2. Type the Machine Type and Serial Number in the corresponding fields.
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3. Click Submit. eSupport also can be used to view the general FRU list for a product. The FRU list is a general list of components and does not contain specific model information. To get the general FRU list for a product, do the following:
1. Go to https://support.lenovo.com. 2. Follow the instructions on the screen to select a product. 3. Click the Product & Parts tab. 4. Select System Service Parts to view a general FRU list.
Chapter 2. Important service information 23

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Chapter 3. General checkout
This chapter introduces following information: � "What to do first" on page 25 � "Checkout guide" on page 26
� "Diagnosing problems" on page 26 � "Quick test programs" on page 27 � "UEFI diagnostic program" on page 27 � "Bootable diagnostic programs" on page 27 � "Power system checkout" on page 28
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 use new nylon-coated screws. � Be extremely careful during such write operations as copying, saving, or formatting. The sequence
of the drives in the computer that you are servicing 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 by referring to the web site: https:// support.lenovo.com/partslookup � A FRU should not be replaced because of a single, unreproducible failure. Single failures can occur for a variety of reasons that have nothing to do with a hardware defect, such as cosmic radiation, electrostatic discharge, or software errors. Consider replacing a FRU only when a problem recurs. If you suspect that a FRU is defective, clear the error log and run the test again. If the error does not recur, do not replace the FRU. � Be careful not to replace a nondefective FRU.
What to do first
When you return a FRU, you must include the following information in the parts exchange form or parts return form that you attach to it:
1. Name and phone number of service technician 2. Date of service 3. Date on which the machine failed 4. Date of purchase 5. Failure symptoms, error codes appearing on the display, and beep symptoms 6. Procedure index and page number in which the failing FRU was detected 7. Failing FRU name and part number 8. Machine type, model number, and serial number 9. Customer's name and address
Note: During the warranty period, the customer may be responsible for repair costs if the computer damage was caused by misuse, accident, modification, unsuitable physical or operating environment, or improper maintenance by the customer. Following is a list of some common items that are not covered under warranty and some symptoms that might indicate that the system was subjected to stress beyond normal use.

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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 PC card or the installation of an incompatible card � Improper disc insertion or use of an optical drive � 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 solid-state drive. If the spindle of a solid-state drive becomes noisy, the
solid-state drive might have been dropped or subject to excessive force.
Checkout guide
Use the following procedures as a guide in identifying and correcting problems with the ThinkPad notebook computers.
Note: The diagnostic tests are intended to test only ThinkPad products. The use of non-ThinkPad products, prototype cards, or modified options can lead to false indications of errors and invalid system responses.
1. Identify the failing symptoms in as much detail as possible. 2. Verify the symptoms. Try to re-create the failure by running the diagnostic test or by repeating the
operation.
Diagnosing problems
Many computer problems can be solved without outside assistance. If you experience a problem with your computer, the first place to start is the troubleshooting information in your computer documentation. If you suspect a software problem, see the documentation, including readme files and help information systems, that come with the operating system or program.
Lenovo Companion or Lenovo Vantage is preinstalled on your computer. It supports the hardware scan function. It combines diagnostic tests, system information collection, security status, and support information, along with hints and tips for optimal system performance.
Note: If you are unable to isolate and repair the problem yourself after running the program, save and print the log files created by the program. You need the log files when you speak to a Lenovo technical support representative.
The troubleshooting information or the diagnostic programs might tell you that you need additional or updated device drivers or other software. You can get the latest technical information and download device drivers and updates from the Lenovo Support Web site at:
https://support.lenovo.com
For additional information, see the help system of the program.
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Quick test programs
Run quick test programs to troubleshoot and resolve computer problems, especially when the computer does not have the Lenovo Solution center installed.
To download and install a quick test program, go to https://www.lenovo.com/diags, and follow the instructions on the Web site.
To run a test using quick test program, do the following: 1. Go to the C:\SWTOOLS\ldiag directory. 2. Double-click the lsc_lite.exe file. 3. When the User Account Control window opens, click Yes. 4. Select the device class to be tested. 5. Select the devices to be tested. 6. Select the test to be performed. 7. Follow the instructions on the screen to start the test. When a problem is detected, information messages are displayed. Refer to the messages to troubleshoot the problem.
UEFI diagnostic program
A UEFI diagnostic program is preinstalled on the computer. It enables you to test memory modules and internal storage devices, view system information, and check and recover bad sectors on internal storage devices.
To run the UEFI diagnostic program, do the following: 1. Turn on the computer. If the computer cannot be turned on, go to "Power system checkout" on page 28, and check the power sources. If an error code is displayed, go to "Symptom-to-FRU index" on page 35 for error code descriptions and troubleshooting hints. 2. When the Lenovo logo is displayed, repeatedly press and release the F10 key. The main screen of the UEFI diagnostic program is displayed. 3. Follow the instructions on the screen to use the diagnostic program.
Bootable diagnostic programs
If the computer you are servicing is not installed with the UEFI diagnostic program, you can download a bootable diagnostic program from the Lenovo Support Web site. The bootable diagnostic programs enable you to test computer memory and internal storage devices, view system information, and check and recover the internal storage devices. To use the bootable diagnostic programs, you can create a bootable diagnostic medium on a USB device or CD.
To create a bootable diagnostic medium, do the following: 1. Go to https://www.lenovo.com/diags. 2. Click Lenovo Bootable Diagnostics. 3. Follow the instructions on the Web site to create a bootable diagnostic medium.
To use the diagnostic medium you have created, do one of the following: � If you have created the bootable diagnostic medium on a USB device, do the following:
1. Attach the USB device to the computer.
Chapter 3. General checkout 27

2. Turn on the computer. If the computer cannot be turned on, go to "Power system checkout" on page 28, and check the power sources. If an error code is displayed, go to "Symptom-to-FRU index" on page 35 for error code descriptions and troubleshooting hints.
3. When the Lenovo logo is displayed, repeatedly press and release the F12 key. When the Boot Menu window opens, release the F12 key.
4. Use the arrow keys to select USB HDD and then press Enter. The diagnostic program will be launched automatically.
5. Follow the instructions on the screen to use the diagnostic program. � If you have created the bootable diagnostic medium on a CD, do the following:
1. Turn on the computer. If the computer cannot be turned on, go to "Power system checkout" on page 28, and check the power sources. If an error code is displayed, go to "Symptom-to-FRU index" on page 35 for error code descriptions and troubleshooting hints.
2. Insert the CD into the optical drive. 3. Restart the computer. 4. When the Lenovo logo is displayed, repeatedly press and release the F12 key. When the Boot Menu
window opens, release the F12 key. 5. Use the arrow keys to select ATAPI CDx (x: 0, 1, ...) and then press Enter. The diagnostic program will
be launched automatically. 6. Follow the instructions on the screen to use the diagnostic program.
Power system checkout
To verify if a battery pack or an ac power adapter is functional, do the following: 1. Turn off the computer. 2. Connect the ac power adapter. 3. Turn on the computer. If the computer can be turned on, it means that either the battery pack or the ac power adapter is functional. 4. Insert a straightened paper clip into the emergency reset hole to reset the computer. If the computer is still powered on, it means that the ac power adapter is functional. 5. Turn off the computer. 6. Disconnect the ac power adapter and turn on the computer. If the computer can be turned on, it means that the battery pack is functional.
If you suspect a power problem, see the appropriate one of the following power supply checkouts: � "Checking the ac power adapter" on page 28 � "Checking the built-in battery and operational charging" on page 29 � "Checking the coin-cell battery" on page 29
Checking the ac power adapter
You are here because the computer fails only when the ac power adapter is used. � If the power problem occurs only when the docking station or the port replicator is used, replace the
docking station or the port replicator. � If the system status indicator does not blink three times 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 29.
Note: Noise from the ac power adapter does not always indicate a defect.
Checking the USB-C type ac power adapter
To check the USB-C type ac power adapter, do the following:
28 T480s Hardware Maintenance Manual

1. Connect the computer to a power outlet and turn on the computer. 2. Start Lenovo Companion program, and then click Hardware Settings Power. The ac power adapter
information is displayed.
Ensure that you use the USB-C type ac power adapter that is shipped with the computer to provide enough power to the computer. Otherwise, a message will 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.
Move your pointer to the battery-status icon in the Windows notification area to check the battery status. The battery-status icon displays the percentage of battery power remaining and how long you can use your computer before you must charge the battery.
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 in the Windows notification area indicates that the battery is not charging, remove the battery and let it return to room temperature.
Note: The built-in battery is NOT customer replaceable. Contact a qualified Lenovo technician to replace the built-in battery. 3. Reinstall the battery. If the battery is still not charging, replace the battery pack. 4. Check the battery status icon again. If the same error still exists, replace the system board.
Checking the coin-cell battery
To check the coin-cell battery, do the following: 1. Disable the built-in battery. See "Disabling the built-in battery" on page 62. 2. Remove the coin-cell battery. See "1110 Coin-cell battery" on page 76. 3. Measure the voltage of the coin-cell battery. See the following illustration.

Wire Red Black

Voltage (V dc) +2.5 to +3.2 Ground

� If the voltage is correct, replace the system board. � If the voltage is not correct, replace the coin-cell battery. � If the coin-cell battery discharges quickly after replacement, replace the system board.

Chapter 3. General checkout 29

30 T480s Hardware Maintenance Manual

Chapter 4. Related service information
This chapter presents following information: � "Recovery information for the Windows 10 operating system" on page 31 � "Passwords" on page 32 � "Power management" on page 34 � "Symptom-to-FRU index" on page 35
Service Web site: When the latest maintenance diskette and the system program service diskette become available, they will be posted on https://support.lenovo.com
Recovery information for the Windows 10 operating system
This chapter provides information about the Windows recovery solutions on the Windows 10 operating system.
Resetting your computer
If your computer does not perform well, you might consider resetting your computer. In the resetting process, you can choose to keep your files or remove them, and then reinstall the Windows operating system.
To reset your computer, do the following:
Note: The items in the graphical user interface (GUI) might change without notice. 1. Open the Start menu, and then click Settings Update & Security Recovery. 2. In the Reset this PC section, click Get started. 3. Follow the instructions on the screen to reset your computer.
Using advanced startup options
The advanced startup options enable you to do the following: � Change the firmware settings of the computer � Change the startup settings of the Windows operating system � Start the computer from an external device � Restore the Windows operating system from a system image
To use advanced startup options, do the following:
Note: The items in the graphical user interface (GUI) might change without notice. 1. Open the Start menu, and then click Settings Update & security Recovery. 2. In the Advanced startup section, click Restart now Troubleshoot Advanced options. 3. Select a startup option you want, and then follow the instructions on the screen.
Recovering your operating system if Windows 10 fails to start
The Windows recovery environment on your computer operates independently from the Windows 10 operating system. It enables you to recover or repair the operating system even if the Windows 10 operating system fails to start.

� Copyright Lenovo 2018, 2020

After two consecutive failed boot attempts, the Windows recovery environment starts automatically. Then you can choose repair and recovery options by following the on-screen instructions.
Note: Ensure that your computer is connected to ac power during the recovery process.
Creating and using a recovery USB drive
You can create a recovery USB drive as a backup for the Windows recovery programs. With the recovery USB drive, you can troubleshoot and fix the problems even if the preinstalled Windows recovery programs are damaged.
It is recommended that you create a recovery USB drive as early as possible. If you did not create a recovery USB drive as a precautionary measure, you can contact Lenovo Customer Support Center and purchase one from Lenovo. For a list of the Lenovo Support phone numbers for your country or region, go to:
https://pcsupport.lenovo.com/supportphonelist
Creating a recovery USB drive To create a recovery USB drive, you need a USB drive with at least 16 GB of storage capacity. The actual USB capacity that is required depends on the size of the recovery image.
Attention: The creation process will delete anything stored on the USB drive. To avoid data loss, make a backup copy of all the data that you want to keep.
To create a recovery USB drive, do the following:
Note: Ensure that your computer is connected to ac power during the following process. 1. Connect a proper USB drive (at least 16 GB of storage) to the computer. 2. Type recovery in the search box on the taskbar. Then click Create a recovery drive. 3. Click Yes in the User Account Control window to allow the Recovery Media Creator program to start. 4. In the Recovery Drive window, follow the instructions on the screen to create a recovery USB drive.
Using the recovery USB drive If you cannot start your computer, use the recovery USB drive to recover your computer.
To use a recovery USB drive, do the following:
Note: Ensure that your computer is connected to ac power during the following process. 1. Connect the recovery USB drive to the computer. 2. Turn on or restart the computer. Before the Windows operating system starts, repeatedly press F12. The Boot Menu window opens. 3. Select the recovery USB drive as the boot device. 4. Select a preferred keyboard layout. 5. Click Troubleshoot to display optional recovery solutions. 6. Select a corresponding recovery solution according to your situation. Then follow the instructions on the screen to complete the process.
Passwords
As many as three passwords may be needed for any ThinkPad notebook computer: the power-on password, the hard disk password, and the supervisor password.
32 T480s Hardware Maintenance Manual

If any of these passwords has been set, a prompt for it will be displayed on the screen whenever the computer is turned on. The computer does not start until the password is entered.
Note: If only a supervisor password is set, the password prompt will not be displayed when the operating system is started.
Power-on password
A power-on password protects the system from being powered on by an unauthorized person. The password must be entered before an operating system can be started. For instructions on how to remove the power-on password, see "How to remove the power-on password" on page 33.
Hard disk password
There are two kinds of hard disk passwords: � User hard disk password - for the user � Master hard disk password - for the system administrator, who can use it to get access to the hard disk
even if the user has changed the user hard disk password
Note: There are two modes for the hard disk password: User only and Master + User. The Master + User mode requires two hard disk passwords; the system administrator enters both in the same operation. The system administrator then provides the user hard disk password to the system user.
Attention: If the user hard disk password has been forgotten, check whether a master hard disk password has been set. If it has, it can be used for access to the solid-state drive. If no master hard disk password is available, neither Lenovo nor Lenovo authorized service technicians provide any services to reset either the user or the master hard disk password, or to recover data from the solid-state drive. The solid-state drive can be replaced for a scheduled fee.
For how to remove the hard disk password, see "How to remove the hard disk password" on page 34.
Supervisor password
The supervisor password protects the system information stored in the ThinkPad Setup program. It provides the following security features:
� If only a supervisor password is set, a password prompt is displayed when you try to start the ThinkPad Setup program. Unauthorized users cannot change most of the system configuration options in the ThinkPad Setup program without the password.
� The system administrator can use the supervisor password to access a computer even if the user of that computer has set a power-on password. The supervisor password overrides the power-on password.
� The system administrator can set the same supervisor password on many ThinkPad notebook computers to make administration easier.
Attention: If the supervisor password has been forgotten and cannot be made available to the service technician, there is no service procedure to reset the password. The system board must be replaced for a scheduled fee.
How to remove the power-on password
To remove a power-on password, do the following:
If no supervisor password has been set, do the following to remove the power-on password: 1. Turn off the computer. 2. Remove the built-in battery. For instructions on how to remove the built-in battery, see "1100 Built-in battery" on page 74.
Chapter 4. Related service information 33

3. Remove the coin-cell battery. For instructions on how to remove the coin-cell battery, see "1110 Coincell battery" on page 76. Wait for a few seconds.
4. Reinstall the coin-cell battery. For instructions on how to install the coin-cell battery, see "1110 Coin-cell battery" on page 76.
5. Reinstall the built-in battery. For instructions on how to reinstall the built-in battery, see "1100 Built-in battery" on page 74.
6. Turn on the computer and wait until the POST ends. After the POST ends, the password prompt does not appear. The power-on password has been removed.
If a supervisor password has been set and is known to the service technician, do the following to remove the power-on password:
1. Turn on the computer. 2. When the Lenovo logo is displayed, immediately press F1. 3. Type the supervisor password to enter the ThinkPad Setup program. 4. Select Security. 5. Select Password. 6. Select Power-On Password. 7. Type the current supervisor password in the Enter Current Password field. then leave the Enter New
Password field blank, and press Enter twice. 8. In the Changes have been saved window, press Enter. 9. Press F10 to save changes and exit the ThinkPad Setup program.
How to remove the hard disk password
Attention: If User only mode is selected and the user hard disk password has been forgotten and cannot be made available to the service technician, neither Lenovo nor Lenovo authorized service technicians provide any services to reset the user hard disk password or to recover data from the solid-state drive. To put the system back to operational status, the only Lenovo and Lenovo-authorized service solution would be to replace the solid-state drive with a scheduled fee.
To remove a user hard disk password that has been forgotten, when the supervisor password and master hard disk password are known, do the following:
1. Turn on the computer. 2. When the Lenovo logo is displayed, immediately press F1 to enter the ThinkPad Setup program. 3. Select Security. 4. Select Password. 5. Select Hard-disk x password, where x is the letter of the hard disk drive. A pop-up window opens. 6. Select Master hard disk password. 7. Type the current master hard disk password in the Enter Current Password field. Then leave the Enter
New Password field blank, and press Enter twice. 8. Press F10. 9. Press F10 to save changes and exit the ThinkPad Setup program. The user hard disk password and the
master hard disk password have been removed.
Power management
To reduce power consumption, the computer has two power management modes: sleep and hibernation.
34 T480s Hardware Maintenance Manual

Sleep mode
When the computer enters sleep mode, the following events occur: � The LCD is powered off. � The solid-state drive is powered off. � The microprocessor stops.
To put your computer into sleep mode, press Fn+4.
To return to normal operation, press the Fn key only.
In certain circumstances, the computer goes into sleep mode automatically: � After a period of inactivity specified in power plan settings � When the battery power is low
Hibernation mode
In hibernation mode, the following occurs: � The system status, RAM, VRAM, and setup data are stored on the solid-state drive. � The system is powered off.
Note: If the computer enters the hibernation mode while it is docked to the docking station or the port replicator, do not undock it before resuming normal operation. If you do undock it and then try to resume normal operation, you will get an error message, and you will have to restart the system.
If you have defined one of the following actions as the event that causes the system to go into hibernation mode, perform that action. � Closing the lid. � Pressing the power button.
Also, the computer goes into hibernation mode automatically after a period of inactivity specified in power plan settings.
When the power is turned on, the computer returns from hibernation mode and resumes operation. The hibernation file in the boot record on the solid-state drive is read, and system status is restored from the solid-state drive.
Symptom-to-FRU index
This section contains following information: � "Numeric error codes" on page 36 � "Error messages" on page 37 � "Beep symptoms" on page 38 � "No-beep symptoms" on page 39 � "LCD-related symptoms" on page 39 � "Intermittent problems" on page 40 � "Undetermined problems" on page 40
The symptom-to-FRU index in this section lists symptoms and errors and their possible causes. The most likely cause is listed first, in boldface type.
Note: Do the FRU replacement or other actions in the sequence shown in the column headed "FRU or action, in sequence." If replacing a FRU does not solve the problem, put the original part back in the computer. Do not replace a nondefective FRU.
Chapter 4. Related service information 35

This index can also help you determine, during regular servicing, what FRUs are likely to need to be replaced next.

A numeric error is displayed for each error detected in POST or system operation. In the displays, n can be any number.

If no numeric code is displayed, check the narrative descriptions of symptoms. If the symptom is not described there, go to "Intermittent problems" on page 40.
Note: For a device not supported by diagnostic codes in the ThinkPad notebook computers, see the manual for that device.

Numeric error codes

Table 1. Numeric error codes

Symptom or error

FRU or action, in sequence

0177 Bad SVP data, stop POST task--The checksum of the supervisor password in the EEPROM is not correct.

Replace the system board.

0183 Bad CRC of Security Settings in EFI Variable. Enter the ThinkPad Setup program. � The checksum of the Security settings in the EFI Variable is not correct.

1. Run the ThinkPad Setup program. The settings will be corrected automatically. Then save the current settings by pressing F10.
2. Replace the system board.

0187

Replace the system board.

EAIA data access error--The access to EEPROM is failed.

0188 Invalid RFID Serialization Information Area.

Replace the system board.

0189 Invalid RFID configuration information area--The EEPROM checksum is not correct.

Replace the system board.

0190 Critical low-battery error

1. Charge the battery pack. 2. Replace the battery pack.

0191 System Security--Invalid Remote Change requested.

1. Run the ThinkPad Setup program, and then save current setting by pressing F10.
2. Replace the system board.

0199 System Security-- Security password retry count exceeded.

1. Run the ThinkPad Setup program. The retry count will be reset. Then save the current settings by pressing F10.
2. Replace the system board.

0270 Real Time Clock Error-- System Real Time Clock is not functional.

Have the computer serviced.

0271 Check Date and Time settings-- Neither the date nor the time is set in the computer.

Set the date and time, using ThinkPad Setup.

1802 Unauthorized network card is plugged in--Turn off and remove the network card.

1. Remove network card. 2. Replace the system board.

1820 More than one external fingerprint reader is attached. Power off and remove all but the reader that you set up within your main operating system.

Remove all but the reader that you set up for the authentication.

36 T480s Hardware Maintenance Manual

Table 1. Numeric error codes (continued) Symptom or error 2100 Detection error on HDD0 (Main HDD) 2101 Detection error on SSD1 (M.2)
2102 Detection error on SSD2 (M.2)
2110 Read error on HDD0 (Main HDD)
2111 Read error on SSD1 (M.2)
2112 Read error on SSD2 (M.2)
2200 Machine Type and Serial Number are invalid. 2201 Machine UUID is invalid

FRU or action, in sequence
Have the hard disk drive serviced.
1. Reseat the M.2 solid-state drive. 2. Replace the M.2 solid-state drive. 3. Replace the system board.
1. Reseat the M.2 solid-state drive. 2. Replace the M.2 solid-state drive. 3. Replace the system board.
1. Reseat the hard disk drive. 2. Replace the main hard disk drive. 3. Replace the system board.
1. Reseat the M.2 solid-state drive. 2. Replace the M.2 solid-state drive. 3. Replace the system board.
1. Reseat the M.2 solid-state drive. 2. Replace the M.2 solid-state drive. 3. Replace the system board.
Have the computer serviced.
Replace the system board.

Error messages

Table 2. Error messages

Symptom or error

FRU or action, in sequence

Fan error.

1. Replace the fan. 2. Apply thermal grease. 3. Replace the system board.

Thermal sensing error.

Replace the system board.

The battery installed is not supported by this system and will not charge. Please replace the battery with the correct Lenovo battery for this system. Press the ESC key to continue.

Replace the battery.

This system does not support batteries that are not genuine Lenovo made or authorized. The system will continue to boot, but may not charge unauthorized batteries. Press the ESC key to continue. 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.

Replace the battery.

Chapter 4. Related service information 37

Beep symptoms
Lenovo SmartBeep technology enables you to decode beep errors with your smartphone when a black screen occurs with beeps from your computer. To decode the beep error with Lenovo SmartBeep technology, do the following:
1. Go to https://support.lenovo.com/smartbeep or scan the following QR Code.

2. Download the proper diagnostic app and install it on your smartphone. 3. Run the diagnostic app and place the smartphone near the computer. 4. Press the Fn key on your computer to emit the beep again. The diagnostic app decodes the beep error
and shows possible solutions on the smartphone.
The following section describes some beep errors and the corresponding solutions.
Note: Do not attempt to service a product yourself unless instructed to do so by the Customer Support Center or product documentation. Only use a Lenovo-authorized service provider to repair your product.

Error codes 0001: Reset error (platform reset not de-asserted)
0002: Internal bus error 0281: General embedded controller error 0282: Memory module error
0283: PCI resource error
0284: TCG-compliant functionality-related error (might be the BIOS code validation failure) 0285: TCG-compliant functionality-related error (might be the TPM initialization failure) 0286: Integrated graphics error

Solutions
1. Remove all power resources (the ac power adapter, removable battery, and coin-cell battery). If your computer has a built-in battery, reset the computer by inserting a straightened paper clip into the emergency-reset hole. Wait for one minute. Then reconnect all power resources.
2. Replace the system board (service provider only).
Replace the system board (service provider only).
Replace the system board (service provider only).
1. Reinstall or replace the memory module. 2. Replace the system board (service provider only).
1. Remove PCIe devices (the M.2 card, PCIe card, and so on) (service provider only).
2. Replace the system board (service provider only).
Replace the system board (service provider only).
Replace the system board (service provider only).
Replace the system board (service provider only).

38 T480s Hardware Maintenance Manual

Error codes 0287: Discrete graphics error
0288: Computer display error

Solutions
1. Reinstall or replace the discrete graphics card (service provider only).
2. Replace the system board (service provider only).
1. Reconnect the display cable on both the system board side and the computer display side (service provider only).
2. Replace the system board (service provider only).

No-beep symptoms
Table 3. No-beep symptoms Symptom or error No beep, power-on indicator on, LCD blank, and no POST.
No beep, power-on indicator on, and LCD blank during POST.
The power-on password prompt appears.
The hard-disk password prompt appears.

FRU or action, in sequence
1. Ensure that every connector is connected tightly and correctly.
2. Reseat memory module. 3. Replace the system board.
1. Reseat memory module. 2. Replace the system board.
A power-on password or a supervisor password is set. Type the password and press Enter.
A hard disk password is set. Type the password and press Enter.

LCD-related symptoms
Important: The TFT LCD for the notebook computer contains many thin-film transistors (TFTs). The presence of a small number of dots that are missing, discolored, or always lighted is characteristic of TFT LCD technology, but excessive pixel problems can cause viewing concerns.If the LCD you are servicing has two or less visible defective pixels, it should not be considered faulty. However, if the LCD has three or more visible defective pixels, it will be deemed as defective by Lenovo and it should be replaced.
Notes:
� This policy applies to all ThinkPad notebooks purchased on 1 January, 2008 or later.
� Lenovo will not provide warranty replacement if the LCD is within specifications because we cannot guarantee that any replacement LCD will have zero pixel defects.
� One pixel consists of R, G, B sub-pixels.

Table 4. LCD-related symptoms
Symptom or error
No beep, power-on indicator on, and a blank LCD during POST.
� LCD backlight not working. � LCD too dark. � LCD brightness cannot be adjusted. � LCD contrast cannot be adjusted.

FRU or action, in sequence Replace the system board.
1. Reseat the LCD connectors. 2. Replace the LCD assembly. 3. Replace the system board.

Chapter 4. Related service information 39

Table 4. LCD-related symptoms (continued)
Symptom or error
� LCD screen unreadable. � Characters missing pixels. � Screen abnormal. � Wrong color displayed.
Horizontal or vertical lines displayed on LCD.

FRU or action, in sequence
1. See important note for "LCD-related symptoms." 2. Reseat all LCD connectors. 3. Replace the LCD assembly. 4. Replace the system board.
Replace the LCD assembly.

Intermittent problems
Intermittent system hang problems can be due to a variety of causes that have nothing to do with a hardware defect, such as cosmic radiation, electrostatic discharge, or software errors. FRU replacement should be considered only when a problem recurs.
When analyzing an intermittent problem, do the following:
1. Run the diagnostic test for the system board in loop mode at least 10 times.
2. If no error is detected, do not replace any FRUs.
3. If any error is detected, replace the FRU shown by the FRU code. Rerun the test to verify that no more errors exist.
Undetermined problems
If the diagnostic tests did not identify the adapter or device that has failed, if wrong devices are installed, or if the system simply is not operating, follow these procedures to isolate the failing FRU (do not isolate FRUs that have no defects).
Verify that all attached devices are supported by the computer.
Verify that the power supply being used at the time of the failure is operating correctly. See "Power system checkout" on page 28.
1. Turn off the computer. 2. Visually check each FRU for damage. Replace any damaged FRU. 3. Remove or disconnect all of the following devices:
a. Non-ThinkPad devices b. Devices attached to the docking station or the port replicator c. Printer, mouse, and other external devices d. Battery pack e. Solid-state drive f. External diskette drive or optical drive g. Memory module h. PC cards 4. Turn on the computer. 5. Determine whether the problem has been solved. 6. If the problem does not recur, reconnect the removed devices one at a time until you find the failing FRU. 7. If the problem remains, replace the following FRUs one at a time (do not replace a nondefective FRU): a. System board b. LCD assembly

40 T480s Hardware Maintenance Manual

Chapter 5. Function keys

The following table describes the functions of function keys and key combinations.

Table 5. Function keys Function key and key combination
+

Description
You can configure the Fn key and function keys in the Keyboard Properties window by doing the following:
1. Go to Control Panel, and then change the view of Control Panel from Category to Large icons or Small icons.
2. Click Lenovo - Keyboard Manager and the Keyboard Manager window is displayed.
3. Select the options of your preference.
Press Fn+Esc to switch the key function between the standard F1�F12 function and the special function printed as an icon on each key. When the Fn Lock indicator is off, you can use the default function. You can change the default function in the Keyboard Properties window.
Mute or unmute the speakers.

If you mute the sound and turn off your computer, the sound will remain muted when you turn on your computer. To turn on the sound, press

Decrease the speaker volume.

Increase the speaker volume. Mute or unmute the microphones.

Darken the computer display. Brighten the computer display.

Manage external displays. Enable or disable the built-in wireless features.

Open the Settings window.

Enable or disable the built-in Bluetooth features.

� Copyright Lenovo 2018, 2020

Table 5. Function keys (continued) Function key and key combination
+ Fn+Spacebar Fn+B Fn+P Fn+S Fn+K Fn+4 Fn+Left arrow key Fn+Right arrow key

Description Open a keyboard setting page.
Invoke the function defined by yourself. To define or change the action for the F12 key, do the following:
1. Open Lenovo Companion.
2. Click Hardware Settings and then click the input icon . 3. Locate the Keyboard: User-defined Key section and follow the
instructions on the screen to complete the setting.
On the Input page, you can also define different functions for the key combinations with F12, such as Shift+F12, Alt+F12, or Ctrl+F12. Open the Snipping Tool program.
If your computer supports keyboard backlight, press Fn+Spacebar to switch between the different keyboard backlight status. This key combination has the same function as the Break key on a conventional external keyboard. This key combination has the same function as the Pause key on a conventional external keyboard.
This key combination has the same function as the SysRq key on a conventional external keyboard.
This key combination has the same function as the ScrLK or Scroll Lock key on a conventional external keyboard. Press Fn+4 to put the computer to sleep mode. To wake up the computer, press the Fn key or the power button. This key combination has the same function as the Home key. This key combination has the same function as the End key.

42 T480s Hardware Maintenance Manual

Chapter 6. Locations
This chapter introduces the locations of the hardware components on your computer.
Locating computer controls, connectors, and indicators
This topic introduces the locations of the computer controls, connectors, and indicators.
Front view

1 Infrared camera (available on some models) 3 Microphones
� Copyright Lenovo 2018, 2020

2 Conventional camera (available on models with the infrared camera) 4 Conventional camera with ThinkShutter (lens cover) (available on some models)
43

5 Power button 7 NFC label for silver model (available on some models) 9 Trackpad 11 TrackPoint pointing stick

6 Fingerprint reader (available on some models) 8 TrackPoint� buttons 10 NFC mark for black model (available on some models) 12 Screen (multi-touch screen on some models)

Right-side view

1 Smart-card slot (available on some models) 3 Fan louvers
Left-side view

2 USB 3.1 connector Gen 1 4 Security-lock slot

1 USB-CTM connector 3 Docking-station connector 5 Always On USB 3.1 connector Gen 1 7 Audio connector
Bottom view

2 USB-CTM connector (ThunderboltTM 3 compatible) 4 Ethernet connector 6 HDMITM connector 8 SD-card slot

44 T480s Hardware Maintenance Manual

1 Fan louvers 3 Docking-station hook holes
Rear view

2 Emergency-reset hole 4 Speakers

1 Nano-SIM-card tray
Status indicators
This topic provides information about locating and identifying the various status indicators on your computer. Note: Depending on the model, your computer might look different from the following illustrations.

Chapter 6. Locations 45

Table 6. Status indicators Indicator 1 Caps Lock indicator 2 Fn Lock indicator 3 Speaker-mute indicator 4 Microphone-mute indicator 5 Camera status indicator 6 8 System status indicators
7 Fingerprint reader indicator 9 ac power status indicator

Meaning
On: You can type uppercase letters by directly pressing the letter keys.
This indicator shows the status of Fn Lock function. For more information, see Chapter 5 "Function keys" on page 41.
On: The speakers are muted.
On: The microphones are muted.
On: The camera is in use. The indicator in the ThinkPad logo on the computer lid and the indicator in the power button show the system status of your computer. � Blinks for three times: The computer is initially connected to power. � On: The computer is on (in normal mode). � Off: The computer is off or in hibernation mode. � Blinks rapidly: The computer is entering sleep or hibernation mode. � Blinks slowly: The computer is in sleep mode.
This indicator shows the status of fingerprint reader.
This indicator shows the battery power status of the computer when ac power is connected. � White: connected to ac power (battery power 90%�100%) � Amber: connected to ac power (battery power 0%�90%) � Off: not connected to ac power

Locating FRUs and CRUs
This topic introduces the following service parts: � "Major FRUs" on page 48 � "LCD FRUs" on page 51

46 T480s Hardware Maintenance Manual

Notes: � 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. � 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. You might be required to return the defective part that is replaced by the 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. ThinkPad computers contain the following types of CRUs: � 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.
Chapter 6. Locations 47

Major FRUs
48 T480s Hardware Maintenance Manual

Table 7. Major FRUs

No. 1

FRU descriptions LCD unit (see "LCD FRUs" on page 51)

Self-service CRU
No

Keyboard

dc-in cable

Power button card

Keyboard bezel assembly

M.2 solid-state drive

Yes

Memory module *

Yes

Wireless LAN card

Yes

Wireless WAN card *

Yes

Nano-SIM-card tray

Yes

SD card reader and audio subcard cable

SD card reader and audio subcard

Battery

Coin-cell battery

Thermal fan assembly

USB subcard cable

USB subcard

Speaker assembly

Base cover assembly

Yes

Smart card reader and fingerprint reader cable *

Smart card reader *

Hall sensor

Hall sensor cable

NFC module

NFC cable

System board

Ethernet connector drop-down door

Trackpad

Trackpad cable

Lenovo factory recovery USB key *

Yes

Miscellaneous parts kits (see "Miscellaneous parts" on page 52) No

Power cord

Yes

ac power adapter

Yes

* Available on some models

Optional-service CRU No Yes No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No

Chapter 6. Locations 49

Note: The Lenovo factory recovery USB key a is used to restore the Microsoft Windows operating system. It might not come with the computer, and a user might order it from https://pcsupport.lenovo.com/ lenovorecovery, though additional shipping and handling fees might apply.
50 T480s Hardware Maintenance Manual

LCD FRUs

Table 8. LCD FRUs No. FRU descriptions
1 LCD bezel sheet 2 LCD bezel 3 Infrared camera card (available on some models) 4 LCD panel 5 Hinge kit 6 LED/camera cable assembly 7 LCD rear cover assembly

Self-service CRU No No No No No No No

Optional-service CRU No No No No No No No

Chapter 6. Locations 51

Table 8. LCD FRUs (continued) No. FRU descriptions
8 Antenna kit 9 LCD cable 10 Conventional camera card (available on some models) 11 ThinkShutter (for models with only conventional camera)

Self-service CRU No No No
No

Optional-service CRU No No No
No

Miscellaneous parts
Table 9. Miscellaneous part
FRU descriptions
Screw kit: � Screw M2 x L2.2, black(9) � Screw M2 x L4, silver (7) � Screw M2 x L2.7, black (11) � Screw M2 x L2.2 + 2.3, black (4) � Screw M2.5 x L4.5, silver (6) � Screw M2.5 x L2.2, black (4) � Screw M2 x L2, black (4) � Spec Mechanical miscellaneous kit: � Microphone rubber � Docking-station connector bracket � Trackpad mylar � Smart card reader mylar � Ethernet extension connector Gen 2 cover � Spec Keyboard removal tool (product part number: 01LX856) Label kit: � GEO label � Spec

Self-service CRU
No

Optional-service CRU
No

Connector and cable guide
This section provides information for Lenovo authorized service technicians to help identify connectors and cables for replacement purpose. To view each FRU and the exploded illustration of the computer, see "Major FRUs" on page 48 and "LCD FRUs" on page 51.
Note: Depending on your model, some connectors or cables might not be available.

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System board connectors and cables

Table 10. System board No. Connector/feature 1 Camera connector (internal)
2 dc-in connector (internal)

Internal cable required LED/camera cable
dc-in cable

3 Thermal fan connector (internal)

Thermal fan assembly cable

4 Memory module slot (internal) 5 Wireless-LAN card slot (internal) 6 LCD connector (internal)

No No LCD cable

7 Wireless-WAN card slot (internal) No

8 USB-C connector (external)

Cable connection
Connect the cable to this connector.
Connect one end to the power button card and the other end to this connector.
The thermal fan assembly comes with the cable. Connect the cable to this connector.
Insert the memory module into this slot.
Insert the wireless-LAN card into this slot.
Connect one end to the LCD panel, and the other end to this connector.
Insert the wireless-WAN card into this slot.
Connect USB-C compatible devices to this connector.

Chapter 6. Locations 53

Table 10. System board (continued)
No. Connector/feature 9 USB-C connector (Thunderbolt 3
compatible) (external)

Internal cable required No

10 Ethernet extension connector Gen No 2 (external)

11 Ethernet connector (external)

12 Speaker assembly connector (internal)

Speaker assembly cable

13 Always On USB 3.1 connector Gen No 1 (external)

14 HDMI connector (external)

15 Coin-cell battery connector (internal)
16 SD card reader/audio subcard connector (internal)
17 NFC connector (internal)

Coin-cell battery cable
SD card reader/audio subcard cable NFC cable

18 Built-in battery connector (internal) No

19 Solid-state drive slot (internal)

20 Trackpad connector (internal)

Trackpad cable

21 Hall sensor connector (internal)

Hall sensor cable

22 Smart card reader and fingerprint Smart card reader/fingerprint

reader connector (internal)

reader cable

23 USB subcard connector (internal) USB subcard cable

24 Nano-SIM-card slot (external)

Cable connection
Connect USB-C compatible or Thunderbolt 3 compatible devices to this connector.
This connector does not work individually. The connectors 8 , 9 and 10 work together as the docking-station connector.
Connect the computer to a LAN through this connector.
The speaker assembly comes with the cable. Connect the cable to this connector.
Connect USB-A compatible devices to this connector.
Connect a compatible digital audio device or video monitor to this connector.
The coin-cell battery comes with cable. Connect the cable to this connector.
Connect one end to the SD card reader/audio subcard, and the other end to this connector.
Connect one end to the NFC module and the other end to this connector.
Connect the built-in battery directly to this connector.
Insert the solid state drive directly into this slot.
Connect one end to the trackpad and the other end to this connector.
Connect one end to the Hall sensor, and the other end to this connector.
Connect one end of the cable to the smart card reader, one end to the fingerprint reader module, and another end to this connector.
Connect one end to the USB subcard, and the other end to this connector.
If the computer supports wireless WAN, insert a nano-SIM card into this slot to establish wireless-WAN connection.

54 T480s Hardware Maintenance Manual

Table 10. System board (continued) No. Connector/feature 25 TrackPoint pointing stick connector (internal)
26 Keyboard connector (internal)

Internal cable required TrackPoint pointing stick cable
Keyboard assembly cable

SD card reader/audio subcard connectors

Cable connection
The TrackPoint pointing stick comes with the cable. Connect the cable to this connector.
The keyboard assembly comes with the cable. Connect the cable to this connector.

Table 11. SD card reader/audio subcard No. Connector/feature 1 Audio connector (external)

Internal cable required No

2 SD card reader connector (external)
3 SD card reader/audio subcard connector (internal)

No
SD card reader/audio subcard cable

Smart card reader connector and cable

Cable connection
Connect headphones or a headset with 3.5-mm (0.14-inch) 4-pole plug to this connector.
Insert an SD card into this slot to read the data on the card.
Connect one end of the SD card reader/audio subcard cable to the connector on the system board, and the other end to this connector.

Chapter 6. Locations 55

Table 12. Smart card reader
No. Connector/feature
1 Smart-card reader connector (internal)

Internal cable required
Smart-card reader/fingerprint reader cable

Cable connection
Connect the end a of the cable to the smart-card reader/fingerprint reader connector on the system board, end b to the fingerprint reader module, and end c to this connector.

Looking up FRU information
For detailed FRU information, including part numbers, descriptions, and substitution part numbers, go to: https://support.lenovo.com/partslookup

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Chapter 7. FRU replacement notices
This chapter presents notices related to removing and replacing parts. Read this chapter carefully before replacing any 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 optionalservice 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. You might be required to return the defective part that is replaced by the 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.
Screw notices
Loose screws can cause a reliability problem. In the ThinkPad notebook computer, this problem is addressed with special nylon-coated screws that have the following characteristics:
� They maintain tight connections. � They do not easily come loose, even with shock or vibration. � They are harder to tighten.
Do the following when you service this machine:
� Keep the screw kit in your tool bag. For the part number of the screw kit, go to https://support.lenovo.com/ partslookup.
� It is recommended to use new screws. � It is recommended to use each screw only once.
Tighten screws as follows:
� Plastic to plastic Turn an additional 90 degrees after the screw head touches the surface of the plastic part.

� Logic card to plastic Turn an additional 180 degrees after the screw head touches the surface of the logic card.

� Copyright Lenovo 2018, 2020

Notes: � Ensure that you use the correct screw. It is recommended to use new screws for replacements. If you
have a torque screwdriver, tighten all screws firmly to the torque specified in the screw information table for each step. � Ensure that torque screwdrivers are calibrated correctly following country specifications.
Retaining serial numbers
This topic provides instructions on the following: � "Restoring the serial number of the system unit" on page 58 � "Retaining the UUID" on page 59
Restoring the serial number of the system unit
When the computer was manufactured, the EEPROM on the system board was loaded with the serial numbers of the system and all major components. These numbers need to remain the same throughout the life of the computer.
If you replace the system board, you must restore the serial number of the system unit to its original value.
The serial number of the system unit is written on the label attached to the bottom of the computer.
If you can not find the serial number of the system unit on the bottom of the computer, try the following method to get the number:
Note: Before you perform the operation, ensure that the UEFI/Legacy setting within the Startup menu in the ThinkPad Setup program is set to UEFI Only.
1. Connect a USB memory key to the computer. 2. Go to https://www.lenovo.com/maintenanceutilities and follow the instructions on the screen to create a
Maintenance Key.
Note: Only an authorized Lenovo service technician can access the above Web site. 3. Restart the computer. 4. When the logo is displayed, press Esc. The ThinkPad Config Information Update Utility interface is
displayed. 5. Type 1 under Enter the action desired, then press Enter. The ThinkPad Serial Number Update Utility for
Asset ID screen is displayed. 6. Type 2 under Enter the action desired, then press Enter. The serial number of each device in your
computer is displayed; the serial number of the system unit is listed as follow: 20- Serial number 7. Record the serial number of the system unit.
After you replace the system board, do the following to restore the serial number of the system unit: 1. Connect the Maintenance Key to the computer.
58 T480s Hardware Maintenance Manual

2. When the logo is displayed, press Esc. The ThinkPad Config Information Update Utility interface is displayed.
3. Type 1 under Enter the action desired, then press Enter. The ThinkPad Serial Number Update Utility for Asset ID screen is displayed.
4. Type 1 under Enter the action desired, then press Enter. Then follow the instructions on the screen to restore the serial number of the system unit.
Retaining the UUID
The Universally Unique Identifier (UUID) is a 128-bit number uniquely assigned to your computer at production and stored in the EEPROM of your system board.
The algorithm that generates the number is designed to provide unique IDs until the year A.D. 3400. No two computers in the world have the same number.
When you replace the system board, perform the following steps to create a new UUID for the system board if the system board does not have a UUID:
Note: Before you perform the operation, ensure that the UEFI/Legacy setting within the Startup menu in the ThinkPad Setup program is set to UEFI Only.
1. Connect a USB memory key to the computer. 2. Go to https://www.lenovo.com/maintenanceutilities and follow the instructions on the screen to create a
Maintenance Key.
Note: Only an authorized Lenovo service technician can access the above Web site. 3. Restart the computer. 4. When the logo screen is displayed, press Esc. The ThinkPad Config Information Update Utility interface
is displayed. 5. Type 2 under Enter the action desired, then press Enter. The Auto UUID generation utility interface is
displayed. 6. Type y under Change UUID. OK? [Y/N], then press Enter. A new UUID is created and written. If a valid
UUID already exists, it is not overwritten.
Reading or writing the ECA information
Information on Engineering Change Announcements (ECA) is stored in the EEPROM of the system board. The electronic storage of this information simplifies the procedure to check if the ECA has been previously applied to a machine. The machine does not need to be disassembled to check for the ECA application.
To check what ECAs have been previously applied to the machine, use the ECA Information Read/Write function on the LENOVO ThinkPad Hardware Maintenance Diskette or Maintenance Key.
1. Insert the latest version of LENOVO ThinkPad Hardware Maintenance Diskette or Maintenance Key, and then restart the computer.
2. From the main menu, select 6. Set ECA Information. 3. To read the ECA information, select 2. Read ECA/rework number from EEPROM and follow the
instructions on the screen. To read the box build date, select 5. Read box build date from EEPROM, and follow the instruction on the screen.
After an ECA has been applied to the machine, the EEPROM must be updated to reflect the ECA's application. Use the latest version of LENOVO ThinkPad Hardware Maintenance Diskette or Maintenance Key to update the EEPROM.
Note: Only the ECA number is stored in the EEPROM. The machine type of the ECA is assumed to be the same as the machine type of the machine that had the ECA applied to it.
Chapter 7. FRU replacement notices 59

1. Insert the latest version of LENOVO ThinkPad Hardware Maintenance Diskette or Maintenance Key, and then restart the computer.
2. From the main menu, select 6. Set ECA Information. 3. To write the ECA information, select 1. Write ECA/rework number from EEPROM, and follow the
instructions on the screen. To write the box build date, select 4. Write box build date from EEPROM, and follow the instruction on the screen. If the system board is being replaced, try to read the ECA information from the old system board and transfer the information to the new system. If the system board is inoperable, this will not be possible.
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Chapter 8. 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 optionalservice 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 is available for downloading at https:// support.lenovo.com. 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 part 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, be sure to 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. Before replacing any FRU, review Chapter 7 "FRU replacement notices" on page 57. 3. 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 section. Remove them in the order in which they are listed. 4. Follow the correct sequence in the steps for removing a FRU, as given in the illustrations by the numbers in square callouts. 5. When turning a screw, turn it in the direction as given by the arrow in the illustration. 6. When removing a FRU, move it in the direction as given by the arrow in the illustration. 7. To put the new FRU in place, reverse the removal procedure and follow any notes that pertain to replacement. 8. When replacing a FRU, use the correct screws as shown in the replacement procedures.
DANGER
Before removing any FRU, turn off the computer, unplug all power cords from electrical outlets, disable the built-in battery, and then disconnect any interconnecting cables.
Attention:
� After replacing a FRU, do not turn on the computer until you have made sure 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 2018, 2020

� The system board is sensitive to, and can be damaged by, electrostatic discharge (ESD). Before touching it, establish personal grounding by touching a ground point with one hand or by using an electrostatic discharge strap.
Before servicing the computer
Carefully read this topic before servicing the computer.
Disabling the built-in battery
Before replacing any FRU, ensure that you disable Fast Startup first and then disable the built-in battery. To disable Fast Startup, do the following:
1. Go to Control Panel, and then change the view of Control Panel from Category to Large icons or Small icons.
2. Click Power Options, and then click Choose what the power buttons do on the left pane. 3. Click Change settings that are currently unavailable at the top. 4. If prompted by User Account Control (UAC), click Yes. 5. Clear the Turn on fast startup check box, and then click Save changes. To disable the built-in battery, do the following: 1. Restart your computer. When the logo screen is displayed, immediately press F1 to enter ThinkPad
Setup. 2. Select Config Power. The Power submenu is displayed. 3. Select Disable built-in battery and press Enter. 4. Select Yes in the Setup Confirmation window. The built-in battery is disabled and the computer turns off
automatically. Wait three to five minutes to let the computer cool.
Removing the nano-SIM card and nano-SIM-card tray
Some models you are servicing might have a nano-SIM card installed. If the computer you are servicing has a nano-SIM card installed, remove the nano-SIM card and the nano-SIM-card tray before you start the servicing.
After you finish the servicing, ensure that you install the card and the tray back into the slot firmly.
Removing a major FRU
This section provides instructions on how to remove a major FRU.
62 T480s Hardware Maintenance Manual

1010 Keyboard
Note: You might be instructed to slide the keyboard frame forward or backward in some of the following steps. In this case, ensure that you do not press or hold the keys while sliding the keyboard frame. Otherwise, the keyboard frame cannot be moved.
Removal steps of the keyboard
1. Take the tool out of the new keyboard package. Insert the tabs a and b into the slot between the TrackPoint buttons and the trackpad 1 . Slightly pivot the tool downward 2 to release the left and right TrackPoint buttons. Then remove the two TrackPoint buttons 3 .
Note: If the keyboard must be removed to access other FRUs, you need the keyboard removal tool (product part number: 01LX856) to remove the keyboard. You can purchase the tool as a separate FRU at: https://support.lenovo.com/partslookup.

2. Loosen the screws that secure the keyboard 4 .

Step 4

Screw (quantity) M2 � 1.65 mm, flat-head, nylon-coated (2)

Color Silver

Torque
0.143 Nm (1.4 kgf-cm)

Chapter 8. Removing or replacing a FRU 63

3. Insert the tabs c and d into the two dents near the two screw heads as shown 5 .

4. Pivot the tool in the direction as shown to release the keyboard 6 . Push the keyboard in the direction as shown by arrows 7 to release the latches from the keyboard bezel.

5. Pivot the keyboard slightly upward as shown by arrow 8 . Then turn the keyboard over as shown by arrow 9 .

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6. Put the keyboard on the palm rest as shown and detach the connectors. Then remove the keyboard. When installing:
1. Attach the connectors and turn the keyboard over as shown.
Chapter 8. Removing or replacing a FRU 65

2. Insert the keyboard into the keyboard bezel as shown. Ensure that the front edge of the keyboard (the edge that is close to the display) is under the keyboard bezel.
3. Slide the keyboard in the direction as shown by the arrows. Ensure that the latches are secured under the keyboard frame.
66 T480s Hardware Maintenance Manual

4. Tighten the screws to secure the keyboard.
5. Take the new TrackPoint buttons out of the new keyboard package. Install the TrackPoint buttons as shown.
6. Connect the ac power adapter and all cables to the computer.
1020 Base cover assembly
Removal steps of the base cover assembly Loosen the screws 1 and then remove the base cover assembly 2 .
Chapter 8. Removing or replacing a FRU 67

Applying labels to the base cover assembly: The following illustration shows the location of each label.

1 Asset tag
3 GEO label (for models manufactured in Yonezawa or assembled in Mexico) 5 IMEI label 7 Genuine Microsoft label (Windows 10)

2 GEO label (for models made in China) or Brazil ANATEL (WLAN/Bluetooth) label 4 Country label
6 S/N label

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1030 Wireless LAN card
Note: This information is only for the user-replaceable modules.
For access, remove this FRU: � "1020 Base cover assembly" on page 67
Removal steps of the wireless LAN card

Step 2

Screw (quantity) M2 � 2.2 mm, flat-head, nylon-coated (1)

Color Black

Torque
0.181 Nm (1.85 kgf-cm)

When installing: Plug the gray cable into the connector labeled MAIN or 2 on the card, and plug the black cable into the connector labeled AUX or 1 on the card.
1040 Wireless WAN card
For access, remove this FRU: � "1020 Base cover assembly" on page 67

Chapter 8. Removing or replacing a FRU 69

Removal steps of the wireless WAN card

Step 3

Screw (quantity) M2 � 2.2 mm, flat-head, nylon-coated (1)

Color Black

Torque
0.181 Nm (1.85 kgf-cm)

When installing: Plug the orange cable into the connector labeled MAIN on the card; and plug the blue cable into the connector labeled AUX on the card.
1050 M.2 solid-state drive
For access, remove this FRU: � "1020 Base cover assembly" on page 67

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Removal steps of the M.2 solid-state drive

Step 1

Screw (quantity) M2 � 2.2 mm, flat-head, nylon-coated (1)

1060 Memory module
For access, remove this FRU: � "1020 Base cover assembly" on page 67
Removal steps of the memory module

Color Black

Torque
0.181 Nm (1.85 kgf-cm)

When installing:

Chapter 8. Removing or replacing a FRU 71

Insert the notched end of the memory module into the contact edge side of the memory slot. Press the memory module in firmly, and pivot it downward until it snaps into place. Ensure that the memory module is firmly installed in the slot and does not move easily.
1070 Ethernet connector drop-down door
For access, remove this FRU: � "1020 Base cover assembly" on page 67
Removal steps of the Ethernet connector drop-down door

Step 1

Screw (quantity) M2 � 4 mm, flat-head, nylon-coated (2)

Color Black

Torque
0.181 Nm (1.85 kgf-cm)

When installing: Ensure that the bracket removed in step 2 is mounted above the Ethernet connector drop-down door.
1080 Thermal fan assembly
For access, remove this FRU: � "1020 Base cover assembly" on page 67
Removal steps of the thermal fan assembly Note: Depending on the model, the thermal fan on your computer might look slightly different from the illustration in this topic.
Loosen the screws 2 in ascending alphabetical order (a to d) as illustrated.

72 T480s Hardware Maintenance Manual

2a 2c

2b 2d

When installing: � Ensure that the fan connector is attached firmly. � Do not touch the areas marked a and b in the following illustrations.

1090 USB subcard assembly
For access, remove these FRUs in order: � "1020 Base cover assembly" on page 67 � "1080 Thermal fan assembly" on page 72

Chapter 8. Removing or replacing a FRU 73

Removal steps of the USB subcard assembly

Step 6

Screw (quantity) M2 � 2.7 mm, flat-head, nylon-coated (2)

When installing: Ensure that the connector is attached firmly.
1100 Built-in battery
For access, remove this FRU: � "1020 Base cover assembly" on page 67

74 T480s Hardware Maintenance Manual

Color Black

Torque
0.181 Nm (1.85 kgf-cm)

Important notices for replacing the 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.
Lenovo provides a diagnostic program to do an automatic battery diagnostic test, which can determine if the removable battery is defective. A removable battery FRU should not be replaced unless this diagnostic test shows that the battery is defective. The only exception to this is if the battery is physically damaged or a customer is reporting a possible safety issue.
If no diagnostic program is installed on the computer, the customer should download and install the program to diagnose the battery, before getting a non-physically damaged battery replaced. Note that the replacement of a physically damaged battery is not covered by the warranty.
Removal steps of the built-in battery
DANGER
Use only the authorized battery specified for your computer. Any other battery could ignite or explode.

Step 1

Screw (quantity) M2 � 4 mm, flat-head, nylon-coated (4)

Color Black

Torque
0.181 Nm (1.85 kgf-cm)

Chapter 8. Removing or replacing a FRU 75

1110 Coin-cell battery
For access, remove these FRUs in order: � "1020 Base cover assembly" on page 67 � "1100 Built-in battery" on page 74
DANGER Use only the authorized battery specified for your computer. Any other battery could ignite or explode. Removal steps of the coin-cell battery
When installing: Ensure that the coin-cell battery connector is attached firmly.
1120 Speaker assembly
For access, remove these FRUs: � "1020 Base cover assembly" on page 67 � "1100 Built-in battery" on page 74
76 T480s Hardware Maintenance Manual

Removal steps of the speaker assembly

Step 2

Screw (quantity) M2 � 2.3 mm, flat-head, nylon-coated (4)

Color Black

Torque
0.181 Nm (1.85 kgf-cm)

When installing: � Ensure that the connector is attached firmly. � Ensure that the cables are routed as shown.
1130 Smart card reader assembly or dummy smart card reader
For access, remove these FRUs in order: � "1020 Base cover assembly" on page 67 � "1100 Built-in battery" on page 74 � "1120 Speaker assembly" on page 76
Chapter 8. Removing or replacing a FRU 77

Removal steps of the smart card reader assembly

Step 4

Screw (quantity) M2 � 2.2 mm, flat-head, nylon-coated (2)

Color Black

Torque
0.181 Nm (1.85 kgf-cm)

When installing: Ensure that the connector is attached firmly.
78 T480s Hardware Maintenance Manual

Removal steps of the dummy smart card reader

Step 1

Screw (quantity) M2 � 2.2 mm, flat-head, nylon-coated (2)

Color Black

Torque
0.181 Nm (1.85 kgf-cm)

1140 SD card reader and audio subcard assembly
For access, remove these FRUs in order: � "1020 Base cover assembly" on page 67 � "1100 Built-in battery" on page 74 � "1120 Speaker assembly" on page 76

Chapter 8. Removing or replacing a FRU 79

Removal steps of the SD card reader and audio subcard assembly

Step 3

Screw (quantity) M2 � 2.7 mm, flat-head, nylon-coated (2)

Color Black

Torque
0.181 Nm (1.85 kgf-cm)

When installing: Ensure that the connector is attached firmly.
1150 Fingerprint reader and smart card reader cable
For access, remove these FRUs: � "1020 Base cover assembly" on page 67 � "1100 Built-in battery" on page 74
80 T480s Hardware Maintenance Manual

Removal steps of the fingerprint reader and smart card reader cable
1160 Hall sensor and hall sensor cable
For access, remove these FRUs: � "1020 Base cover assembly" on page 67 � "1100 Built-in battery" on page 74
Chapter 8. Removing or replacing a FRU 81

Removal steps of the hall sensor and hall sensor cable

Step 6

Screw (quantity) M2 � 2.7 mm, flat-head, nylon-coated (1)

When installing: Ensure that the connectors are attached firmly.
1170 Trackpad cable and trackpad
For access, remove these FRUs: � "1020 Base cover assembly" on page 67 � "1100 Built-in battery" on page 74

Color Silver

Torque
0.181 Nm (1.85 kgf-cm)

82 T480s Hardware Maintenance Manual

Removal steps of the trackpad cable Chapter 8. Removing or replacing a FRU 83

Removal steps of the trackpad

Step 3

Screw (quantity) M2 � 2 mm, flat-head, nylon-coated (4)

Color Bronze

Torque
0.181 Nm (1.85 kgf-cm)

1180 NFC cable and NFC module
For access, remove these FRUs: � "1020 Base cover assembly" on page 67 � "1100 Built-in battery" on page 74
84 T480s Hardware Maintenance Manual

Removal steps of the NFC cable
Removal steps of the NFC module
When installing: Ensure that the connectors are attached firmly.
1190 System board
Important notices for handling the system board When handling the system board, read the following: � The system board has an accelerometer, which can be broken when several thousands of G-forces are
applied. Note: Dropping a system board from a height of as little as 6 inches so that it falls flat on a hard bench can subject the accelerometer to as much as 6,000 G's of shock.
Chapter 8. Removing or replacing a FRU 85

� Be careful not to drop the system board on a bench top that has a hard surface, such as metal, wood, or composite.
� Avoid rough handling of any kind. � At every point in the process, be sure not to drop or stack the system board. � If you put a system board down, be sure to put it only on a padded surface such as an ESD mat or a
corrugated conductive material. For access, remove these FRUs in order: � "Removing the nano-SIM card and nano-SIM-card tray" on page 62 � "1010 Keyboard" on page 63
Note: The keyboard removal tool (product part number: 01LX856) is needed for removing the keyboard. You can purchase it as a separate FRU at: https://support.lenovo.com/partslookup. � "1020 Base cover assembly" on page 67 � "1030 Wireless LAN card" on page 69 � "1040 Wireless WAN card " on page 69 � "1050 M.2 solid-state drive" on page 70 � "1060 Memory module" on page 71 � "1100 Built-in battery" on page 74 � "1080 Thermal fan assembly" on page 72 � "1070 Ethernet connector drop-down door" on page 72 The following component a CPU soldered on the top side of the system board is extremely sensitive. When you service the system board, avoid any kind of rough handling.
86 T480s Hardware Maintenance Manual

Removal steps of the system board

Step 20

Screw (quantity) M2 � 4 mm, flat head, nylon-coated (1)

Color Black

Torque
0.181 Nm (1.85 kgf-cm)

Chapter 8. Removing or replacing a FRU 87

Step 22

Screw (quantity) M2 � 2.5 mm, flat head, nylon-coated (4)

Color Silver

Torque
0.181 Nm (1.85 kgf-cm)

When installing: Ensure that the connectors are attached firmly.
1200 dc-in cable and power button card
For access, remove these FRUs: � "Removing the nano-SIM card and nano-SIM-card tray" on page 62 � "1010 Keyboard" on page 63
Note: The keyboard removal tool (product part number: 01LX856) is needed for removing the keyboard. You can purchase it as a separate FRU at: https://support.lenovo.com/partslookup. � "1020 Base cover assembly" on page 67 � "1030 Wireless LAN card" on page 69 � "1040 Wireless WAN card " on page 69 � "1050 M.2 solid-state drive" on page 70 � "1060 Memory module" on page 71 � "1070 Ethernet connector drop-down door" on page 72 � "1080 Thermal fan assembly" on page 72 � "1100 Built-in battery" on page 74 � "1190 System board" on page 85

88 T480s Hardware Maintenance Manual

Removal steps of the dc-in cable and power button card

Step 4

Screw (quantity) M2 � 2.7 mm, flat-head, nylon-coated (1)

When installing: Ensure that the connectors are attached firmly.
1210 LCD unit
For access, remove this FRU: � "1020 Base cover assembly" on page 67

Color Black

Torque
0.181 Nm (1.85 kgf-cm)

Chapter 8. Removing or replacing a FRU 89

Removal steps of the LCD unit
When installing: Ensure that the connectors are attached firmly. 90 T480s Hardware Maintenance Manual

Step 9

Screw (quantity) M 2.5 � 4.5 mm, flat-head, nylon-coated (6)

Color Silver

Torque
0.294 Nm (3.0 kgf-cm)

Chapter 8. Removing or replacing a FRU 91

When installing: Ensure that you route the cables correctly and firmly.
Attention: When you route the cables, ensure that they are not subject to any tension. Tension could cause the cables to be damaged by the cable guides, or a wire to be broken.
1220 Keyboard bezel assembly
For access, remove these FRUs in order: � "Removing the nano-SIM card and nano-SIM-card tray" on page 62 � "1010 Keyboard" on page 63
Note: The keyboard removal tool (product part number: 01LX856) is needed for removing the keyboard. You can purchase it as a separate FRU at: https://support.lenovo.com/partslookup. � "1020 Base cover assembly" on page 67 � "1030 Wireless LAN card" on page 69 � "1040 Wireless WAN card " on page 69 � "1050 M.2 solid-state drive" on page 70 � "1060 Memory module" on page 71 � "1070 Ethernet connector drop-down door" on page 72 � "1080 Thermal fan assembly" on page 72 � "1090 USB subcard assembly" on page 73 � "1100 Built-in battery" on page 74 � "1110 Coin-cell battery" on page 76 � "1120 Speaker assembly" on page 76 � "1130 Smart card reader assembly or dummy smart card reader" on page 77 � "1140 SD card reader and audio subcard assembly" on page 79 � "1150 Fingerprint reader and smart card reader cable" on page 80 � "1160 Hall sensor and hall sensor cable" on page 81 � "1170 Trackpad cable and trackpad" on page 82 � "1180 NFC cable and NFC module" on page 84 � "1190 System board" on page 85 � "1200 dc-in cable and power button card" on page 88 � "1210 LCD unit" on page 89
92 T480s Hardware Maintenance Manual

Removing an LCD FRU
This section provides instructions on how to remove an LCD FRU.
2010 LCD bezel sheet and LCD bezel
For access, remove these FRUs in order: � "1020 Base cover assembly" on page 67 � "1210 LCD unit" on page 89 Removal steps of the LCD bezel sheet and LCD bezel
When installing: � Ensure that all the latches are attached firmly. � Ensure that a new LCD bezel sheet is used. Install a new LCD bezel sheet whenever the old one is
removed. � Due to degradation of adhesive on the LCD bezel sheet, it is recommended that the LCD bezel also be
ordered for machines that are three years or older.
2020 LCD panel and LCD cable assembly
For access, remove these FRUs in order: � "1020 Base cover assembly" on page 67 � "1210 LCD unit" on page 89 � "2010 LCD bezel sheet and LCD bezel" on page 93
Chapter 8. Removing or replacing a FRU 93

Removal steps of the LCD panel and LCD cable assembly

Step 1

Screw (quantity) M2 � 2.2 mm, flat-head, nylon-coated (4)

Color Black

Torque
0.181 Nm (1.85 kgf-cm)

5 4

When installing: Ensure that the LCD connector is attached firmly.
2030 Hinge kit
For access, remove these FRUs in order: � "1020 Base cover assembly" on page 67
94 T480s Hardware Maintenance Manual

� "1210 LCD unit" on page 89 � "2010 LCD bezel sheet and LCD bezel" on page 93
Removal steps of the hinge kit

Step 1

Screw (quantity) M2.5 � 2.2 mm, flat-head, nylon-coated (4)

Color Bronze

Torque
0.294 Nm (3.0 kgf-cm)

2040 ThinkShutter, camera card, and LED/camera cable (for models with only conventional camera)
For access, remove these FRUs: � "1020 Base cover assembly" on page 67 � "1210 LCD unit" on page 89 � "2010 LCD bezel sheet and LCD bezel" on page 93 � "2020 LCD panel and LCD cable assembly" on page 93 � "2030 Hinge kit" on page 94
Removal step of the ThinkShutter

Chapter 8. Removing or replacing a FRU 95

Removal step of the camera card 96 T480s Hardware Maintenance Manual

Removal step of the LED/camera cable
2050 Camera card and LED/camera cable (for models with infrared camera)
For access, remove these FRUs: � "1020 Base cover assembly" on page 67 � "1210 LCD unit" on page 89 � "2010 LCD bezel sheet and LCD bezel" on page 93 � "2020 LCD panel and LCD cable assembly" on page 93 � "2030 Hinge kit" on page 94 Removal step of the camera card
Chapter 8. Removing or replacing a FRU 97

Removal step of the camera cable
2060 Antenna kit
For access, remove these FRUs in order: � "1020 Base cover assembly" on page 67 � "1210 LCD unit" on page 89 � "2010 LCD bezel sheet and LCD bezel" on page 93 � "2020 LCD panel and LCD cable assembly" on page 93 � "2030 Hinge kit" on page 94
98 T480s Hardware Maintenance Manual

Removal steps of the antenna kit
Attention: As you route the cables, ensure that they are not subject to any tension. Tension could cause the cables to be damaged by the cable guides, or a wire to be broken. Antenna locations
d
Chapter 8. Removing or replacing a FRU 99

a Wireless LAN main antenna (gray) b Wireless WAN main antenna (orange, available on some models) c Wireless WAN auxiliary antenna (blue, available on some models) d Wireless LAN auxiliary antenna (black)
2070 LCD rear cover assembly
For access, remove these FRUs in order: � "1020 Base cover assembly" on page 67 � "1210 LCD unit" on page 89 � "2010 LCD bezel sheet and LCD bezel" on page 93 � "2020 LCD panel and LCD cable assembly" on page 93 � "2030 Hinge kit" on page 94 � "2040 ThinkShutter, camera card, and LED/camera cable (for models with only conventional camera)" on
page 95 � "2050 Camera card and LED/camera cable (for models with infrared camera)" on page 97 � "2060 Antenna kit" on page 98
100 T480s Hardware Maintenance Manual

Appendix A. 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. 1009 Think Place - Building One 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.

101

Electronic emissions notices
For electronic emission information on Class B digital devices, refer to the corresponding information in the User Guide.
EU contact: Lenovo, Einsteinova 21, 851 01 Bratislava, Slovakia
Trademarks
The following terms are trademarks of Lenovo in the United States, other countries or both: Lenovo Lenovo logo ThinkPad ThinkPad logo TrackPoint
Thunderbolt is a trademark of Intel Corporation or its subsidiaries in the U.S. and/or other countries. Microsoft, Windows and Windows Server are trademarks of the Microsoft group of companies. 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. Other company, product, or service names may be the trademarks or service marks of others.
102 T480s Hardware Maintenance Manual

Appendix B. Abbreviation table

The following table lists all abbreviations used in this manual.

Abbreviation BGA CMOS CMV CRC CRT CRU CTO EAIA EEPROM EFI ESD FRU GAV IC LCD MTM POST RFID SVP UUID

Term Ball Grid Array Complementary Metal Oxide Semiconductor Custom Model Variant Cyclic redundancy check Cathode ray tube Customer Replaceable Unit Configure To Order Enhanced Asset Information Area Electrically Erasable Programmable Read-Only Memory Extensible Firmware Interface Electrostatic discharge Field Replaceable Unit General Announce Variant Integrated circuits Liquid Crystal Display Machine type and model Power-on self-test Radio-frequency identification Supervisor password Universally unique identifier

103

104 T480s Hardware Maintenance Manual

Part Number: SP40Q51782_01 Printed in
(1P) P/N: SP40Q51782_01

*1PSP40Q51782_01*