Lenovo ThinkCentre M720t Owner's manual

ThinkCentre M720t User Guide and Hardware
Maintenance Manual
Energy Star Machine Types: 10SQ, 10SR, 10SS, 10TQ, 10U4, and
10U5

Note: efore using this information and the product it supports, be sure to read and understand the
Important Product Information Guide and Appendix A “Notices” on page 77.
First Edition (June 2018)
© opyright Lenovo 2018.
LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is delivered pursuant to a General Services
Administration “GSA” contract, use, reproduction, or disclosure is subject to restrictions set forth in Contract No. GS-
35F-05925.

Contents
hapter 1. Overview . . . . . . . . . . . 1
Front view . . . . . . . . . . . . . . . . . . 1
Rear view . . . . . . . . . . . . . . . . . . 3
System board . . . . . . . . . . . . . . . . 5
Machine type and model label . . . . . . . . . . 6
hapter 2. Specifications . . . . . . . . 7
hapter 3. omputer locks . . . . . . . 9
Locking the computer cover . . . . . . . . . . . 9
Enabling or disabling the E-lock . . . . . . . . . 9
Attaching a Kensington-style cable lock . . . . . 10
Attaching a smart cable clip . . . . . . . . . . 10
hapter 4. Replacing hardware . . . . 13
efore replacing hardware . . . . . . . . . . 13
Knowing FRUs (including CRUs) . . . . . . . . 13
Locating FRUs (including CRUs) . . . . . . . . 14
Replacing the keyboard or wireless keyboard . . . 16
Replacing the mouse or wireless mouse . . . . . 17
Replacing the power cord . . . . . . . . . . . 21
Replacing the dust shield . . . . . . . . . . . 22
Removing the computer cover . . . . . . . . . 23
Replacing the front bezel . . . . . . . . . . . 23
Replacing the optical drive . . . . . . . . . . 24
Replacing the optical drive bracket . . . . . . . 25
Replacing the storage drive . . . . . . . . . . 26
Replacing a memory module. . . . . . . . . . 31
Replacing a PCI Express card . . . . . . . . . 34
Replacing the Wi-Fi card . . . . . . . . . . . 36
Replacing the M.2 solid-state drive . . . . . . . 38
Replacing the M.2 solid-state drive bracket . . . . 45
Replacing the power supply assembly . . . . . . 46
Replacing the Wi-Fi antennas . . . . . . . . . 48
Replacing the internal speaker . . . . . . . . . 51
Replacing the front fan . . . . . . . . . . . . 53
Replacing the illuminated red dot cable . . . . . 55
Replacing the thermal sensor . . . . . . . . . 57
Replacing the front I/O bracket . . . . . . . . . 58
Replacing the power button . . . . . . . . . . 60
Replacing the card reader board . . . . . . . . 61
Replacing the heat sink and fan assembly . . . . 62
Replacing the microprocessor . . . . . . . . . 64
Replacing the coin-cell battery . . . . . . . . . 67
Replacing the E-lock . . . . . . . . . . . . . 69
Replacing the cover presence switch . . . . . . 70
Replacing the rear fan . . . . . . . . . . . . 72
Replacing the system board . . . . . . . . . . 73
Completing the parts replacement . . . . . . . 74
Appendix A. Notices . . . . . . . . . . 77
Appendix B. Trademarks . . . . . . . 79
© Copyright Lenovo 2018 i

ii ThinkCentre M720t User Guide and Hardware Maintenance Manual

hapter 1. Overview
This chapter provides basic information to help you get familiar with your computer.
Front view
Note: Your computer model might look slightly different from the illustration.
Figure 1. Front view
1 Optical drive eject/close button (optional) 2 Optical drive activity indicator (optional)
3 Internal speaker 4 Storage drive status indicator
5 Card reader slot (optional) 6 Power button
7 Power indicator 8 Microphone connector
9 Headset connector 10 Type-C US 3.1 Gen 1 connector
11 US 3.1 Gen 1 connectors (2) 12 US 3.1 Gen 2 connectors (2)
13 Illuminated red dot
1 Optical drive eject/close button (optional)
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Used to eject the tray of the optical drive. After you insert a disc into the tray, press the eject/close button to
close the tray.
2 Optical drive activity indicator (optional)
This indicator is on when the optical drive is in use.
3 Internal speaker
Used to listen to the sounds from your computer without using a headset or headphones.
4 Storage drive activity indicator
This indicator is on when the storage drive is in use.
5 ard reader slot (optional)
Used to read data from a supported memory card.
6 Power button
Used to turn on your computer. When you cannot shut down the computer from the operating system, press
and hold the power button for four or more seconds to turn off the computer.
7 Power indicator
This indicator is on when the computer is on.
8 Microphone connector
Used to connect a microphone to your computer. You can use the microphone to record sounds or interact
with the computer using speech-recognition software.
9 Headset connector
Used to connect a headset or headphones to your computer.
10 Type- USB 3.1 Gen 1 connector
Used to connect a Type-C US 3.1 compatible device.
11 USB 3.1 Gen 1 connectors
Used to connect a US -compatible device. For optimal data transfer, connect a US 3.1 Gen 1 device to a
US 3.1 Gen 2 or US 3.1 Gen 1 connector instead of a US 2.0 connector.
12 USB 3.1 Gen 2 connectors
Used to connect a US -compatible device. For optimal data transfer, connect a US 3.1 Gen 2 device to a
US 3.1 Gen 2 connector instead of a US 3.1 Gen 1 or US 2.0 connector.
13 Illuminated red dot
This indicator is on when the computer is on.
2ThinkCentre M720t User Guide and Hardware Maintenance Manual

Rear view
Note: Your computer model might look slightly different from the illustration.
Figure 2. Rear view
1 Audio line-out connector 2 VGA-out connector
3 DisplayPort® 1.2 out connectors (2) 4 US 2.0 connector
5 US 2.0 connectors (3) 6 Serial connector
7 PS/2 keyboard and mouse connectors (optional) 8 Ethernet connector
9 Smart cable clip slots (2) (optional) 10 Serial connector (optional)
11 PCI Express card area 12 Padlock loop
13 Security-lock slot 14 Power cord connector
1 Audio line-out connector
Used to send audio signals from the computer to external devices, such as powered stereo speakers,
headphones, or multimedia keyboards. To connect a stereo system or other external recording device,
connect a cable between the audio line-in connector of the device and the audio line-out connector of the
computer.
Chapter 1.Overview 3

Note: If your computer has both an audio line-out connector and a headset or headphone connector, always
use the headset or headphone connector for earphones, headphones, or a headset. The headphone
connector does not support headset microphones.
2 VGA-out connector
Used to send video signals from the computer to another video device, such as a monitor.
3 DisplayPort 1.2 out connectors
Used to send audio and video signals from the computer to another audio or video device, such as a high-
performance monitor.
4 USB 2.0 connector
Used to connect a device that requires a US 2.0 connection.
Note: The US 2.0 connector supports the smart power on feature. If you connect a Lenovo-recommended
US 1.1 keyboard to this connector, you can power on the computer or wake it up from S4 hibernation mode
by pressing Alt+P on the keyboard. Ensure that you use a Lenovo-recommended keyboard that supports the
smart power on feature.
5 USB 2.0 connectors
Used to connect a device that requires a US 2.0 connection.
6 Serial connector
Used to connect an external modem, a serial printer, or other devices that use a serial connector.
7 PS/2 keyboard and mouse connectors (optional)
Used to connect a keyboard, a mouse, or trackball, or other pointing devices that uses a Personal System/2
(PS/2) connector.
8 Ethernet connector
Used to connect an Ethernet cable for network access.
9 Smart cable clip slots (optional)
Used to secure a smart cable clip.
10 Serial connector (optional)
Used to connect an external modem, a serial printer, or other devices that use a serial connector.
11 P I Express card area
To improve the operating performance of the computer, you can connect PCI Express cards into this area.
Depending on the computer model, the connectors in this area vary.
12 Padlock loop
Used to secure a padlock.
13 Security-lock slot
4ThinkCentre M720t User Guide and Hardware Maintenance Manual

Used to secure a Kensington-style cable lock.
14 Power cord connector
Used to connect the power cord to your computer for power supply.
System board
Note: See “Front view” and “Rear view” for additional component descriptions.
Figure 3. System board
1 4-pin power connector 2 Microprocessor fan connector
3 Power button connector 4 Internal speaker connector
5 Auxiliary fan connector 2 6 10-pin power connector
7 Auxiliary fan connector 1 8 SATA power connectors (2)
9 Clear CMOS (Complementary Metal Oxide
Semiconductor) / Recovery jumper
10 SATA 3.0 connectors (3)
11 M.2 solid-state drive slot 12 M.2 Wi-Fi card slot
13 Thermal sensor connector 14 Illuminated red dot connector
Chapter 1.Overview 5

15 Front US 2.0 connector 16 Parallel connector
17 Serial (COM2) connector 18 PCI Express x1 card slots (2)
19 PCI Express x16 graphics card slot 20 System fan connector
21 E-lock connector 22 Microprocessor socket
23 Cover presence switch connector (Intrusion switch
connector)
24 Coin-cell battery
25 Memory slot (DIMM1) 26 Memory slot (DIMM2)
27 Memory slot (DIMM3) 28 Memory slot (DIMM4)
29 Keyboard and mouse connector
Machine type and model label
The machine type and model label identifies the computer. When you contact Lenovo for help, the machine
type and model information helps support technicians to identify the computer and provide faster service.
The machine type and model label is attached on the computer as shown.
Figure 4. achine type and model label
6ThinkCentre M720t User Guide and Hardware Maintenance Manual

hapter 2. Specifications
Power supply
• 180-watt automatic voltage-sensing power supply
• 210-watt automatic voltage-sensing power supply
• 260-watt automatic voltage-sensing power supply
Storage drives
• 3.5–inch storage drive (optional)
• 2.5–inch storage drive (optional)
• M.2 solid-state drive (optional)
Video features
The integrated graphics card supports the following:
• DisplayPort 1.2 out connector
• VGA-out connector
Audio features
• The integrated audio card supports the following:
– Audio line-out connector
– Headset connector
– Internal speaker
– Microphone connector (optional)
• The optional discrete audio card provides an enhanced audio experience and extended capabilities.
Input/Output (I/O) features
• Audio connectors (audio line-out, headset, and microphone)
• Card reader slot (optional)
• DisplayPort 1.2 out connector
• Ethernet connector
• PS/2 keyboard connector (optional)
• PS/2 mouse connector (optional)
• Serial connectors
• US connectors (US 2.0, US 3.1, and Type-C US 3.1)
• VGA-out connector
Expansion
• Card reader (optional)
• Memory slots
• M.2 solid-state drive slot
• Optical drive (optional)
• PCI Express x1 card slots
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• PCI Express x16 graphics card slot
• Storage drive bay
Network features
• Ethernet LAN
• Wireless LAN (optional)
• luetooth (optional)
Physical dimensions
• Width: 150 mm (5.9 inches)
• Height: 360 mm (14.2 inches)
• Depth: 270.5 mm (10.6 inches)
Weight (without the package)
Maximum configuration as shipped: 6.9 kg (15.2 lb)
8ThinkCentre M720t User Guide and Hardware Maintenance Manual

hapter 3. omputer locks
This chapter provides instructions on how to lock your computer with the locking devices to keep your
computer safe.
Locking the computer cover
Locking the computer cover helps prevent unauthorized access to the inside of your computer. Your
computer features a padlock loop so that the computer cover cannot be removed when a padlock is
installed.
Figure 5. Locking the computer cover
Enabling or disabling the E-lock
Your computer may have a security lock solution installed to protect the computer from unauthorized
tampering of the internal components. Using the E-Lock, you can mechanically lock or unlock the computer
cover.
To enable or disable the E-Lock, do the following:
1. Turn on or restart the computer.
2. efore Windows starts up, repeatedly press and release the F1 or Fn+F1 key until the Setup Utility
program opens.
3. Click Security ➙ Electronic Lock to enable or disable the E-lock.
4. Press F10 or Fn+F10 to save the changes and reboot the computer.
Note: Changes do not take effect until the setting is saved and the system is rebooted.
© Copyright Lenovo 2018 9

Figure 6. Enabling or disabling the E-lock
Attaching a Kensington-style cable lock
You can use a Kensington-style cable lock to secure your computer to a desk, table, or other nonpermanent
fixture. The cable lock connects to the security-lock slot at the rear of your computer. Depending on the type
selected, the cable lock can be operated with a key or combination. The cable lock also locks the buttons
used to open the computer cover. This is the same type of lock used with many notebook computers. You
can order such a cable lock directly from Lenovo by searching for Kensington at:
http://www.lenovo.com/support
Figure 7. Attaching a Kensington-style cable lock
Attaching a smart cable clip
A smart cable clip can be used to secure devices, such as the keyboard and the mouse, by locking the
device cables to the computer. The smart cable clip connects to the cable-lock slots on the rear of the
computer. To install a smart cable clip, do the following:
1. Insert the clip 1 into the cable-lock slot 4.
2. Pull the cables you want to lock through the dents in the smart cable clip.
3. Press the clip 2 into the cable-lock slot 3 until it snaps into position.
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Figure 8. Attaching a smart cable clip
Chapter 3.Computer locks 11

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hapter 4. Replacing hardware
This chapter provides instructions on how to replace hardware for your computer.
Before replacing hardware
Attention: Do not open your computer or attempt any repairs before reading this section and the Important
Product Information Guide.
Notes before replacing hardware
• Use computer components provided only by Lenovo.
• When installing or replacing an option, use the appropriate instructions explained in this manual along with
the instructions that come with the option.
• In most areas of the world, Lenovo requires the return of defective CRUs. Information about this will come
with the CRU or will come a few days after the CRU arrives.
Handling static-sensitive devices
Do not open the static-protective package containing the new part until the defective part has been removed
and you are ready to install the new part. Static electricity, although harmless to you, can seriously damage
computer components and options.
When you handle options and other computer components, take these precautions to avoid static-electricity
damage:
• Limit your movement. Movement can cause static electricity to build up around you.
• Always handle options and other computer components carefully. Handle PCI/PCIe cards, memory
modules, system boards, and microprocessors by the edges. Never touch any exposed circuitry.
• Prevent others from touching the options and other computer components.
• Touch the static-protective package containing the part to a metal expansion-slot cover or other
unpainted metal surface on the computer for at least two seconds. This reduces static electricity from the
package and your body before you install or replace a new part.
• When possible, remove the new part from the static-protective package, and install it directly in the
computer without setting the part down. When this is not possible, place the static-protective package on
a smooth, level surface and place the part on the package.
• Do not place the part on the computer cover or other metal surface.
Knowing FRUs (including RUs)
• Field Replaceable Units (FRUs) are computer parts that a trained technician can upgrade or replace. FRUs
include all CRUs. For detailed FRU information, such as the FRU part numbers and supported computer
models, go to:
http://www.lenovo.com/serviceparts-lookup
• Customer Replaceable Units (CRUs) are computer parts that a user can upgrade or replace.
– Self-service CRUs: You can install self-service CRUs easily. These CRUs might be stand-alone,
latched, or secured by up to two screws. Examples of self-service CRUs include the keyboard, mouse,
and any US device. You are responsible for replacing all self-service CRUs.
– Optional-service CRUs: Handling optional-service CRUs requires some technical skills and simple tools
(such as a screwdriver). These CRUs are isolated parts within the computer. They are usually
© Copyright Lenovo 2018 13

concealed by an access panel that is secured by more than two screws. You must remove the screws
and panel to access the specific CRU. Optional-service CRUs can be removed and installed by users
or, during the warranty period, by a Lenovo service technician.
Before replacing FRUs
efore replacing any FRU, read the following:
• Only certified and trained personnel can service the computer.
• efore replacing an FRU, read the entire section about replacing the part.
• e extremely careful during writing operations such 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 an FRU only with another FRU of the correct model.
When you replace an FRU, ensure that the model of the machine and the FRU part number are correct.
• An 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 an FRU only when a
problem recurs. If you suspect that an FRU is defective, clear the error log and run the test again. If the
error does not recur, do not replace the FRU.
• Only replace a defective FRU.
Locating FRUs (including RUs)
Notes:
• Some of the components are optional.
• To replace a component that is not in the list below, contact a Lenovo service technician. For a list of
Lenovo Support phone numbers, go to:
http://www.lenovo.com/support/phone
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Figure 9. Locating FRUs
Self-service RUs Optional-service RUs Non- RUs
1 Computer cover 4 Wi-Fi card 2 Heat sink and fan assembly
6 Coin-cell battery 5 Wi-Fi card shield 3 Rear fan
8 Memory module 32 Power supply assembly 7 Microprocessor
10 M.2 solid-state drive heat sink 36 E-lock 9 System board
11 M.2 solid-state drive 13 Power button
12 M.2 solid-state drive bracket 14 Optical drive cable
16 Optical drive bracket 15 Card reader
22 Optical drive 17 Front I/O bracket
Chapter 4.Replacing hardware 15

Self-service RUs Optional-service RUs Non- RUs
23 Front bezel 18 Internal speaker
24 Dust shield 19 Wi-Fi antennas
25 Keyboard 20 Illuminated red dot cable
26 Mouse 21 Thermal sensor
27 Power cord 30 Storage drive cable
28 Storage converter 31 Front fan
29 Primary or secondary storage
drive (a 2.5-inch or 3.5-inch storage
drive)
33 Chassis
34 PCI Express card 35 Cover presence switch (Intrusion
switch)
37 Wi-Fi antenna cover
Replacing the keyboard or wireless keyboard
Note: The wireless keyboard is available only on some models.
Replacing the keyboard
1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Disconnect the old keyboard cable from the computer.
3. Connect a new keyboard to the appropriate connector on the computer.
Figure 10. Replacing the keyboard
Replacing the wireless keyboard
1. Remove your old wireless keyboard.
2. Take out the new wireless keyboard from the package.
3. Open the battery compartment cover, and install two AAA batteries according to the polarity indicators.
16 ThinkCentre M720t User Guide and Hardware Maintenance Manual