Table of Contents
- Chapter 1. Overview
- Chapter 2. Specifications
- Chapter 3. Computer locks
- Chapter 4. Replacing hardware
- Before replacing hardware
- Knowing FRUs (including CRUs)
- Locating FRUs (including CRUs)
- Replacing external options
- Removing the computer cover
- Replacing the front bezel
- Replacing the optical drive
- Pivoting the drive bay assembly upward and downward
- Replacing the storage drive
- Replacing the power button board and the card reader
- Replacing the illuminated red dot
- Replacing the internal speaker
- Replacing the thermal sensor
- Replacing the Wi-Fi card
- Replacing the Wi-Fi antennas
- Replacing the M.2 solid-state drive
- Replacing the M.2 solid-state drive bracket
- Replacing the coin-cell battery
- Replacing a memory module
- Replacing the heat sink and fan assembly
- Replacing the microprocessor
- Replacing a PCI Express card
- Replacing the cover presence switch
- Replacing the power supply assembly
- Replacing the system board
- Completing the parts replacement
- Appendix A. Notices
- Appendix B. Trademarks
Lenovo M725s User Manual
Displayed below is the user manual for M725s by Lenovo which is a product in the PCs/Workstations category. This manual has pages.
Related Manuals
M725s User Guide and Hardware
Maintenance Manual
Energy Star Machine Types: 10VT, 10VU, 10VV, and 10VX
Note: Before 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 63.
First Edition (July 2018)
© Copyright Lenovo 2018.
LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is delivered pursuant to a General Services
Administration “GSA” contract, use, reproduction, or disclosure is subject to restrictions set forth in Contract No. GS-
35F-05925.
Contents
Chapter 1. Overview . . . . . . . . . . . 1
Front view . . . . . . . . . . . . . . . . . . 1
Rear view . . . . . . . . . . . . . . . . . . 3
System board . . . . . . . . . . . . . . . . 5
Machine type and model label . . . . . . . . . . 6
Chapter 2. Specifications . . . . . . . . 7
Chapter 3. Computer locks . . . . . . . 9
Chapter 4. Replacing hardware . . . . 11
Before replacing hardware . . . . . . . . . . 11
Knowing FRUs (including CRUs) . . . . . . . . 11
Locating FRUs (including CRUs) . . . . . . . . 12
Replacing external options . . . . . . . . . . 14
Removing the computer cover . . . . . . . . . 16
Replacing the front bezel . . . . . . . . . . . 17
Replacing the optical drive . . . . . . . . . . 18
Pivoting the drive bay assembly upward and
downward . . . . . . . . . . . . . . . . . 20
Replacing the storage drive . . . . . . . . . . 22
Replacing the power button board and the card
reader . . . . . . . . . . . . . . . . . . 27
Replacing the illuminated red dot . . . . . . . . 31
Replacing the internal speaker . . . . . . . . . 33
Replacing the thermal sensor . . . . . . . . . 35
Replacing the Wi-Fi card . . . . . . . . . . . 38
Replacing the Wi-Fi antennas . . . . . . . . . 40
Replacing the M.2 solid-state drive . . . . . . . 42
Replacing the M.2 solid-state drive bracket . . . . 45
Replacing the coin-cell battery . . . . . . . . . 46
Replacing a memory module. . . . . . . . . . 48
Replacing the heat sink and fan assembly . . . . 50
Replacing the microprocessor . . . . . . . . . 52
Replacing a PCI Express card . . . . . . . . . 54
Replacing the cover presence switch . . . . . . 56
Replacing the power supply assembly . . . . . . 57
Replacing the system board . . . . . . . . . . 59
Completing the parts replacement . . . . . . . 60
Appendix A. Notices . . . . . . . . . . 63
Appendix B. Trademarks . . . . . . . 65
© Copyright Lenovo 2018 i
ii M725s User Guide and Hardware Maintenance Manual
Chapter 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 button 2 Optical drive activity indicator
3 Storage drive activity indicator 4 Card reader slot (optional)
5 Power button 6 Power indicator
7 Microphone connector 8 Headphone connector
9 USB 3.1 Gen 2 connectors (2) 10 USB 3.1 Gen 1 connectors (2)
11 Illuminated red dot 12 Internal speaker (optional)
1 Optical drive eject button
Used to eject the tray of the optical drive.
© Copyright Lenovo 2018 1
2 Optical drive activity indicator
This indicator is on when the optical drive is in use.
3 Storage drive activity indicator
This indicator is on when the storage drive is in use.
4 Card reader slot
Used to read data from a supported memory card.
5 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.
6 Power indicator
This indicator is on when the computer is on.
7 Microphone connector
Used to connect a microphone to your computer when you want to record sound or interact with the
computer using speech recognition software.
8 Headphone connector
Used to connect headphones to your computer.
9 USB 3.1 Gen 2 connector
Used to connect a USB-compatible device. For optimal data transfer, connect a USB 3.1 Gen 2 device to a
USB 3.1 Gen 2 connector instead of a USB 3.1 Gen 1 or USB 2.0 connector.
10 USB 3.1 Gen 1 connector
Used to connect a USB-compatible device. For optimal data transfer, connect a USB 3.1 Gen 1 device to a
USB 3.1 Gen 2 or USB 3.1 Gen 1 connector instead of a USB 2.0 connector.
11 Illuminated red dot
This indicator is on when the computer is on.
12 Internal speaker
Used to listen to the sounds from your computer without using a headset or headphones.
2M725s User Guide and Hardware Maintenance Manual
Rear view
Note: Your computer model might look slightly different from the illustration.
Figure 2. Rear view
1 Microphone connector 2 VGA-out connector
3 DisplayPort® 1.2 out connectors (2) 4 USB 3.1 Gen 1 connectors (2)
5 USB 2.0 connectors (2) 6 PS/2 keyboard connector
7 Audio line-out connector 8 Audio line-in connector
9 Serial connector 10 Ethernet connector
11 PS/2 mouse connector 12 Security-lock slot
13 Padlock loop 14 PCI-Express card area
15 Smart cable clip slots (2) (optional) 16 Power cord connector
1 Microphone connector
Used to connect a microphone to your computer when you want to record sound or interact with the
computer using speech recognition software.
2 VGA-out connector
Chapter 1.Overview 3
Used to send video signals from the computer to another video device, such as a monitor.
3 DisplayPort 1.2 out connector
Used to send audio and video signals from the computer to another audio or video device, such as a high-
performance monitor.
4 USB 3.1 Gen 1 connector
Used to connect a USB-compatible device. For optimal data transfer, connect a USB 3.1 Gen 1 device to a
USB 3.1 Gen 2 or USB 3.1 Gen 1 connector instead of a USB 2.0 connector.
5 USB 2.0 connector
Used to connect a device that requires a USB 2.0 connection.
6 PS/2 keyboard connector
Used to connect a keyboard that uses a Personal System/2 (PS/2) keyboard connector.
7 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.
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.
8 Audio line-in connector
Used to receive audio signals from an external audio device, such as a stereo system. To connect an external
audio device, connect a cable between the audio line-out connector of the device and the audio line-in
connector of the computer.
9 Serial connector
Used to connect an external modem, a serial printer, or other devices that use a serial connector.
10 Ethernet connector
Used to connect an Ethernet cable for network access.
11 PS/2 mouse connector
Used to connect a mouse, a trackball, or other pointing devices that use a PS/2 mouse connector.
12 Security-lock slot
Used to secure a Kensington-style cable lock.
13 Padlock loop
Used to secure a padlock.
4M725s User Guide and Hardware Maintenance Manual
14 PCI-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.
15 Smart cable clip slots
Used to secure a smart cable clip.
16 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 Internal speaker connector 4 Storage drive activity indicator
5 Power button board connector 6 SATA power connectors (2)
7 10-pin power connector 8 Clear CMOS /Recovery jumper
9 SATA 3.0 connectors (3) 10 Auxiliary fan connector 1
11 Illuminated red dot connector 12 Thermal sensor connector
13 M.2 solid-state drive slot 14 Front USB 2.0 connector (card reader connector)
15 Front USB 2.0 connector 16 Parallel connector
Chapter 1.Overview 5
17 Serial (COM2) connector 18 Buzzer
19 PCI Express x1 card slots (2) 20 PCI Express x16 graphics card slot
21 System fan connector 22 Microprocessor socket
23 Memory slot (DIMM1) 24 Memory slot (DIMM2)
25 Memory slot (DIMM3) 26 Memory slot (DIMM4)
27 Coin-cell battery 28 PCH
29 M.2 Wi-Fi card slot 30 Cover presence switch connector (intrusion switch
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 to the computer as shown.
Figure 4. Machine type and model label
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Chapter 2. Specifications
Power supply
• 180-watt automatic voltage-sensing power supply
• 210-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
• The optional discrete graphics card provides an enhanced video experience and extended capabilities.
Audio features
• The integrated audio card supports the following:
– Audio line-in connector
– Audio line-out connector
– Headphone connector
– Internal speaker (optional)
– Microphone connector
• The optional discrete audio card provides an enhanced audio experience and extended capabilities.
Input/Output (I/O) features
• Audio connectors (audio line-in, audio line-out, headphone, and microphone)
• Card reader slot (optional)
• Display connectors (DisplayPort 1.2 out and VGA-out)
• Ethernet connector
• PS/2 keyboard connector
• PS/2 mouse connector
• Serial connector
• USB connectors
Expansion
• Card reader (optional)
• Memory slots
• Optical drive
• PCI Express x1 card slot
• PCI Express x16 graphics card slot
© Copyright Lenovo 2018 7
• Storage drive bay
Network features
• Ethernet LAN
• Wireless LAN (optional)
• Bluetooth (optional)
Physical dimensions
• Width: 92.5 mm (3.6 inches)
• Height: 343.5 mm (13.5 inches)
• Depth: 290.5 mm (11.4 inches)
Weight (without the package)
Maximum configuration as shipped: 6.0 kg (13.2 lb)
8M725s User Guide and Hardware Maintenance Manual
Chapter 3. Computer locks
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
Attaching a Kensington-style cable lock
You can use a Kensington-style cable lock to secure your computer to a desk, table, or another
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 a 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 6. Attaching a Kensington-style cable lock
© Copyright Lenovo 2018 9
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.
Figure 7. Attaching a smart cable clip
10 M725s User Guide and Hardware Maintenance Manual
Chapter 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.
Notes when 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 CRUs)
• 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 USB 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 11
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
Before replacing any FRU, read the following:
• Only certified and trained personnel can service the computer.
• Before replacing an FRU, read the entire section about replacing the part.
• Be 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 CRUs)
Notes:
• Some of the following 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
12 M725s User Guide and Hardware Maintenance Manual
Figure 8. Locating FRUs (including CRUs)
Self-service CRUs Optional-service CRUs Non-CRUs
1 Computer cover 4 Wi-Fi card 2 Heat sink fan duct
6 Coin-cell battery 5 Wi-Fi card shield 3 Heat sink and fan assembly
8 Memory module 34 Power supply assembly 7 Microprocessor
10 M.2 solid-state drive 9 System board
11 M.2 solid-state drive bracket 14 Card reader
12 Secondary storage drive bracket 15 Power button board
13 Secondary storage drive (a 2.5-
inch storage drive)
16 Front I/O bracket
Chapter 4.Replacing hardware 13
Self-service CRUs Optional-service CRUs Non-CRUs
18 Optical drive bracket 17 Optical drive cable
19 Optical drive 28 Storage drive cable
20 Front bezel 29 Illuminated red dot
21 Dust shield 30 Thermal sensor
22 Keyboard 31 Internal speaker
23 Mouse 33 Chassis
24 Power cord 35 Wi-Fi antennas (2)
25 Primary storage drive (a 2.5-inch
or 3.5-inch storage drive)
36 Cover presence switch (intrusion
switch)
26 Primary storage drive bracket
27 Storage converter
32 Vertical stand
37 PCI Express card
Replacing external options
Attention: Do not open your computer or attempt any repairs before reading the Important Product
Information Guide.
1. Remove any media from the drives and turn off all connected devices and the computer.
2. Disconnect all power cords from electrical outlets and disconnect all cables from the computer.
3. Replace external options.
• Vertical stand
Figure 9. Removing the vertical stand
14 M725s User Guide and Hardware Maintenance Manual
Figure 12. Removing the dust shield
Figure 13. Installing the dust shield
4. Reconnect the external cables and power cords to the corresponding connectors on the computer.
Removing the computer cover
Attention: Do not open your computer or attempt any repairs before reading the Important Product
Information Guide.
CAUTION:
16 M725s User Guide and Hardware Maintenance Manual
Before you open the computer cover, turn off the computer and wait several minutes until the
computer is cool.
1. Remove any media from the drives and turn off all connected devices and the computer.
2. Disconnect all power cords from electrical outlets and disconnect all cables from the computer.
3. Unlock any locking device that secures the computer cover.
4. Remove external options. See “Replacing external options” on page 14.
5. Remove the computer cover.
Figure 14. Removing the computer cover
6. Complete the replacement. See “Completing the parts replacement” on page 60.
Replacing the front bezel
Attention: Do not open your computer or attempt any repairs before reading the Important Product
Information Guide.
1. Remove external options. See “Replacing external options” on page 14.
2. Remove the computer cover. See “Removing the computer cover” on page 16.
3. Replace the front bezel.
Chapter 4.Replacing hardware 17
Figure 15. Removing the front bezel
Figure 16. Installing the front bezel
4. Complete the replacement. See “Completing the parts replacement” on page 60.
Replacing the optical drive
Attention: Do not open your computer or attempt any repairs before reading the Important Product
Information Guide.
18 M725s User Guide and Hardware Maintenance Manual
1. Remove external options. See “Replacing external options” on page 14.
2. Remove the computer cover. See “Removing the computer cover” on page 16.
3. Remove the front bezel. See “Replacing the front bezel” on page 17.
4. Disconnect the signal cable and the power cable from the optical drive.
5. Replace the optical drive.
Figure 17. Removing the optical drive
Figure 18. Removing the optical drive bracket
Chapter 4.Replacing hardware 19
Figure 19. Installing the optical drive bracket
Figure 20. Installing the optical drive
6. Connect the signal cable and the power cable to the new optical drive.
7. Reinstall the removed parts. To complete the replacement, see “Completing the parts replacement” on
page 60.
Pivoting the drive bay assembly upward and downward
Attention: Do not open your computer or attempt any repairs before reading the Important Product
Information Guide.
1. Remove external options. See “Replacing external options” on page 14.
2. Remove the computer cover. See “Removing the computer cover” on page 16.
3. Remove the front bezel. See “Replacing the front bezel” on page 17.
4. Pivot the drive bay assembly upward and downward.
20 M725s User Guide and Hardware Maintenance Manual
Replacing the storage drive
Attention: Do not open your computer or attempt any repairs before reading the Important Product
Information Guide.
1. Remove external options. See “Replacing external options” on page 14.
2. Remove the computer cover. See “Removing the computer cover” on page 16.
3. Remove the front bezel. See “Replacing the front bezel” on page 17.
4. Pivot the drive bay assembly upward. See “Pivoting the drive bay assembly upward and downward” on
page 20.
5. Disconnect the signal cable and the power cable from the storage drive.
6. Replace the storage drive.
• 2.5-inch or 3.5-inch primary storage drive
Figure 23. Removing the primary storage drive bracket
Figure 24. Removing the 3.5-inch primary storage drive or storage converter
22 M725s User Guide and Hardware Maintenance Manual
Note: If you replace the 3.5-inch primary storage drive, skip this step.
Figure 25. Removing the 2.5-inch primary storage drive from the storage converter
Note: If you replace the 3.5-inch primary storage drive, skip this step.
Figure 26. Installing the 2.5-inch primary storage drive into the storage converter
Chapter 4.Replacing hardware 23
Figure 27. Installing the 3.5-inch primary storage drive or storage converter
Figure 28. Installing the primary storage drive bracket
• 2.5-inch secondary storage drive
24 M725s User Guide and Hardware Maintenance Manual
Figure 32. Installing the 2.5-inch secondary storage drive
Figure 33. Installing the inner 2.5-inch secondary storage drive bracket
26 M725s User Guide and Hardware Maintenance Manual
Figure 34. Installing the outer 2.5-inch secondary storage drive bracket
7. Connect the signal cable and the power cable to the new storage drive.
8. Pivot the drive bay assembly downward and reinstall the removed parts. To complete the replacement,
see “Completing the parts replacement” on page 60.
Replacing the power button board and the card reader
Attention: Do not open your computer or attempt any repairs before reading the Important Product
Information Guide.
1. Remove external options. See “Replacing external options” on page 14.
2. Remove the computer cover. See “Removing the computer cover” on page 16.
3. Remove the front bezel. See “Replacing the front bezel” on page 17.
4. Disconnect the power button board cable and the card reader cable from the system board.
5. Replace the power button board and the card reader.
Chapter 4.Replacing hardware 27
Figure 35. Removing the front I/O bracket
Figure 36. Removing the power button board
Figure 37. Removing the card reader bracket
28 M725s User Guide and Hardware Maintenance Manual
Figure 40. Installing the card reader bracket
Figure 41. Installing the power button board
30 M725s User Guide and Hardware Maintenance Manual
Figure 42. Installing the front I/O bracket
6. Connect the new power button board cable and the new card reader cable to the system board.
7. Reinstall the removed parts. To complete the replacement, see “Completing the parts replacement” on
page 60.
Replacing the illuminated red dot
Attention: Do not open your computer or attempt any repairs before reading the Important Product
Information Guide.
1. Remove external options. See “Replacing external options” on page 14.
2. Remove the computer cover. See “Removing the computer cover” on page 16.
3. Remove the front bezel. See “Replacing the front bezel” on page 17.
4. Pivot the drive bay assembly upward. See “Pivoting the drive bay assembly upward and downward” on
page 20.
5. Disconnect the illuminated red dot cable from the system board.
6. Replace the illuminated red dot.
Chapter 4.Replacing hardware 31
Figure 43. Removing the illuminated red dot cover
Figure 44. Removing the illuminated red dot
Figure 45. Installing the illuminated red dot
32 M725s User Guide and Hardware Maintenance Manual
Figure 46. Installing the illuminated red dot cover
7. Connect the new illuminated red dot cable to the system board.
8. Pivot the drive bay assembly downward and reinstall the removed parts. To complete the replacement,
see “Completing the parts replacement” on page 60.
Replacing the internal speaker
Attention: Do not open your computer or attempt any repairs before reading the Important Product
Information Guide.
1. Remove external options. See “Replacing external options” on page 14.
2. Remove the computer cover. See “Removing the computer cover” on page 16.
3. Remove the front bezel. See “Replacing the front bezel” on page 17.
4. Disconnect the internal speaker cable from the system board.
5. Replace the internal speaker.
Figure 47. Pressing the tab
Chapter 4.Replacing hardware 33
Figure 48. Pivoting the drive bay assembly upward
Figure 49. Removing the internal speaker
34 M725s User Guide and Hardware Maintenance Manual
Figure 50. Installing the internal speaker
Figure 51. Pivoting the drive bay assembly downward
6. Connect the new internal speaker cable to the system board.
7. Reinstall the removed parts. To complete the replacement, see “Completing the parts replacement” on
page 60.
Replacing the thermal sensor
Attention: Do not open your computer or attempt any repairs before reading the Important Product
Information Guide.
1. Remove external options. See “Replacing external options” on page 14.
2. Remove the computer cover. See “Removing the computer cover” on page 16.
3. Remove the front bezel. See “Replacing the front bezel” on page 17.
4. Disconnect the thermal sensor cable from the system board.
Chapter 4.Replacing hardware 35
5. Replace the thermal sensor.
Figure 52. Pressing the tab
Figure 53. Pivoting the drive bay assembly upward
36 M725s User Guide and Hardware Maintenance Manual
Figure 56. Pivoting the drive bay assembly downward
6. Connect the new thermal sensor cable to the system board.
7. Reinstall the removed parts. To complete the replacement, see “Completing the parts replacement” on
page 60.
Replacing the Wi-Fi card
Attention: Do not open your computer or attempt any repairs before reading the Important Product
Information Guide.
1. Remove external options. See “Replacing external options” on page 14.
2. Remove the computer cover. See “Removing the computer cover” on page 16.
3. Remove the front bezel. See “Replacing the front bezel” on page 17.
4. Pivot the drive bay assembly upward. See “Pivoting the drive bay assembly upward and downward” on
page 20.
5. Replace the Wi-Fi card.
Figure 57. Removing the Wi-Fi card shield
38 M725s User Guide and Hardware Maintenance Manual
Figure 62. Installing the Wi-Fi card shield
6. Pivot the drive bay assembly downward and reinstall the removed parts. To complete the replacement,
see “Completing the parts replacement” on page 60.
Replacing the Wi-Fi antennas
Attention: Do not open your computer or attempt any repairs before reading the Important Product
Information Guide.
1. Remove external options. See “Replacing external options” on page 14.
2. Remove the computer cover. See “Removing the computer cover” on page 16.
3. Remove the front bezel. See “Replacing the front bezel” on page 17.
4. Disconnect the Wi-Fi antenna cables from the Wi-Fi card. See “Replacing the Wi-Fi card” on page 38.
5. Replace the Wi-Fi antennas.
• Front Wi-Fi antenna
Figure 63. Removing the front Wi-Fi antenna
40 M725s User Guide and Hardware Maintenance Manual
Figure 66. Installing the rear Wi-Fi antenna
6. Connect the new Wi-Fi antenna cables to the Wi-Fi card.
7. Reinstall the removed parts. To complete the replacement, see “Completing the parts replacement” on
page 60.
Replacing the M.2 solid-state drive
Attention: Do not open your computer or attempt any repairs before reading the Important Product
Information Guide.
1. Remove external options. See “Replacing external options” on page 14.
2. Remove the computer cover. See “Removing the computer cover” on page 16.
3. Remove the front bezel. See “Replacing the front bezel” on page 17.
4. Pivot the drive bay assembly upward. See “Pivoting the drive bay assembly upward and downward” on
page 20.
5. Depending on your computer model, refer to one of the following to replace the M.2 solid-state drive.
• Type 1
Figure 67. Pulling out the stopper
42 M725s User Guide and Hardware Maintenance Manual
Figure 71. Pulling out the stopper
Figure 72. Removing the M.2 solid-state drive
Figure 73. Installing the M.2 solid-state drive
44 M725s User Guide and Hardware Maintenance Manual
Figure 74. Inserting the stopper
6. Pivot the drive bay assembly downward and reinstall the removed parts. To complete the replacement,
see “Completing the parts replacement” on page 60.
Replacing the M.2 solid-state drive bracket
Attention: Do not open your computer or attempt any repairs before reading the Important Product
Information Guide.
1. Remove external options. See “Replacing external options” on page 14.
2. Remove the computer cover. See “Removing the computer cover” on page 16.
3. Remove the front bezel. See “Replacing the front bezel” on page 17.
4. Pivot the drive bay assembly upward. See “Pivoting the drive bay assembly upward and downward” on
page 20.
5. Remove the M.2 solid-state drive. See “Replacing the M.2 solid-state drive” on page 42.
6. Replace the M.2 solid-state drive bracket.
Figure 75. Removing the M.2 solid-state drive bracket
Chapter 4.Replacing hardware 45
Figure 76. Installing the M.2 solid-state drive bracket
7. Pivot the drive bay assembly downward and reinstall the removed parts. To complete the replacement,
see “Completing the parts replacement” on page 60.
Replacing the coin-cell battery
Attention: Do not open your computer or attempt any repairs before reading the Important Product
Information Guide.
Note: To dispose of the coin-cell battery, refer to “Lithium coin-cell battery notice” in the Safety and
Warranty Guide.
Your computer has a special type of memory that maintains the date, time, and settings for built-in features,
such as parallel connector assignments (configurations). A coin-cell battery keeps this information active
when you turn off the computer.
The coin-cell battery normally requires no charging or maintenance throughout its life; however, no coin-cell
battery lasts forever. If the coin-cell battery fails, the date, time, and configuration information (including
passwords) are lost. An error message is displayed when you turn on the computer.
1. Remove external options. See “Replacing external options” on page 14.
2. Remove the computer cover. See “Removing the computer cover” on page 16.
3. Remove the front bezel. See “Replacing the front bezel” on page 17.
4. Pivot the drive bay assembly upward. See “Pivoting the drive bay assembly upward and downward” on
page 20.
5. Replace the coin-cell battery.
46 M725s User Guide and Hardware Maintenance Manual
Figure 79. Installing the coin-cell battery
Figure 80. Securing the coin-cell battery with the latch
6. Pivot the drive bay assembly downward and reinstall the removed parts. To complete the replacement,
see “Completing the parts replacement” on page 60.
Replacing a memory module
Attention: Do not open your computer or attempt any repairs before reading the Important Product
Information Guide.
Ensure that you follow the installation order for memory modules shown in the following figure.
48 M725s User Guide and Hardware Maintenance Manual
1. Remove external options. See “Replacing external options” on page 14.
2. Remove the computer cover. See “Removing the computer cover” on page 16.
3. Remove the front bezel. See “Replacing the front bezel” on page 17.
4. Pivot the drive bay assembly upward. See “Pivoting the drive bay assembly upward and downward” on
page 20.
5. Replace a memory module.
Figure 81. Removing a memory module
Chapter 4.Replacing hardware 49
Figure 82. Installing a memory module
6. Pivot the drive bay assembly downward and reinstall the removed parts. To complete the replacement,
see “Completing the parts replacement” on page 60.
Replacing the heat sink and fan assembly
Attention: Do not open your computer or attempt any repairs before reading the Important Product
Information Guide.
CAUTION:
The heat sink and microprocessor might be very hot. Before you open the computer cover, turn off the
computer and wait several minutes until the computer is cool.
1. Remove external options. See “Replacing external options” on page 14.
2. Remove the computer cover. See “Removing the computer cover” on page 16.
3. Remove the front bezel. See “Replacing the front bezel” on page 17.
4. Pivot the drive bay assembly upward. See “Pivoting the drive bay assembly upward and downward” on
page 20.
5. Disconnect the microprocessor fan cable from the system board.
6. Replace the heat sink and fan assembly.
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Figure 85. Installing the heat sink and fan assembly
Figure 86. Installing the heat sink fan duct
7. Connect the new microprocessor fan cable to the system board.
8. Pivot the drive bay assembly downward and reinstall the removed parts. To complete the replacement,
see “Completing the parts replacement” on page 60.
Replacing the microprocessor
Attention: Do not open your computer or attempt any repairs before reading the Important Product
Information Guide.
52 M725s User Guide and Hardware Maintenance Manual
CAUTION:
The heat sink and microprocessor might be very hot. Before you open the computer cover, turn off the
computer and wait several minutes until the computer is cool.
1. Remove external options. See “Replacing external options” on page 14.
2. Remove the computer cover. See “Removing the computer cover” on page 16.
3. Remove the front bezel. See “Replacing the front bezel” on page 17.
4. Pivot the drive bay assembly upward. See “Pivoting the drive bay assembly upward and downward” on
page 20.
5. Remove the heat sink and fan assembly. See “Replacing the heat sink and fan assembly” on page 50.
6. Record the cable routing and cable connections, and then disconnect all cables from the system board.
See “System board” on page 5.
7. Replace the microprocessor.
Notes:
• Your microprocessor and socket might look different from the one illustrated.
• Touch only the edges of the microprocessor. Do not touch the gold contacts on the bottom.
• Do not drop anything onto the microprocessor socket while it is exposed. The socket pins must be
kept as clean as possible.
Figure 87. Releasing the handle
Figure 88. Removing the microprocessor
Chapter 4.Replacing hardware 53
Figure 89. Installing the microprocessor
Figure 90. Securing the retainer with the handle
8. Route all the cables that you disconnected from the system board, and then reconnect the cables to the
system board.
9. Pivot the drive bay assembly downward and reinstall the removed parts. To complete the replacement,
see “Completing the parts replacement” on page 60.
Replacing a PCI Express card
Attention: Do not open your computer or attempt any repairs before reading the Important Product
Information Guide.
1. Remove external options. See “Replacing external options” on page 14.
2. Remove the computer cover. See “Removing the computer cover” on page 16.
54 M725s User Guide and Hardware Maintenance Manual
3. Remove the front bezel. See “Replacing the front bezel” on page 17.
4. Pivot the drive bay assembly upward. See “Pivoting the drive bay assembly upward and downward” on
page 20.
5. Replace a PCI Express card.
Note: If the card is held in place by a retaining latch, press the latch as shown to disengage the latch.
Then, gently remove the card from the slot.
Figure 91. Removing a PCI Express card
Figure 92. Installing a PCI Express card
Chapter 4.Replacing hardware 55
6. Pivot the drive bay assembly downward and reinstall the removed parts. To complete the replacement,
see “Completing the parts replacement” on page 60.
Replacing the cover presence switch
Attention: Do not open your computer or attempt any repairs before reading the Important Product
Information Guide.
1. Remove external options. See “Replacing external options” on page 14.
2. Remove the computer cover. See “Removing the computer cover” on page 16.
3. Disconnect the cover presence switch cable from the system board.
4. Replace the cover presence switch.
Figure 93. Removing the cover presence switch
56 M725s User Guide and Hardware Maintenance Manual
Figure 94. Installing the cover presence switch
5. Connect the new cover presence switch cable to the system board.
6. Reinstall the removed parts. To complete the replacement, see “Completing the parts replacement” on
page 60.
Replacing the power supply assembly
Attention: Do not open your computer or attempt any repairs before reading the Important Product
Information Guide.
Although there are no moving parts in the computer after the power cord has been disconnected, the
following warnings are required for your safety and proper Underwriters Laboratories (UL) certification.
CAUTION:
Hazardous moving parts. Keep fingers and other body parts away.
CAUTION:
Never remove the cover on a power supply or any part that has the following label attached.
Chapter 4.Replacing hardware 57
Hazardous voltage, current, and energy levels are present inside any component that has this label
attached. There are no serviceable parts inside these components. If you suspect a problem with one
of these parts, contact a service technician.
1. Remove external options. See “Replacing external options” on page 14.
2. Remove the computer cover. See “Removing the computer cover” on page 16.
3. Remove the front bezel. See “Replacing the front bezel” on page 17.
4. Pivot the drive bay assembly upward. See “Pivoting the drive bay assembly upward and downward” on
page 20.
5. Disconnect the power supply assembly cables from the system board.
6. Replace the power supply assembly.
Figure 95. Removing the power supply assembly
58 M725s User Guide and Hardware Maintenance Manual
Figure 96. Installing the power supply assembly
7. Connect the new power supply assembly cables to the system board.
8. Pivot the drive bay assembly downward and reinstall the removed parts. To complete the replacement,
see “Completing the parts replacement” on page 60.
Replacing the system board
Attention: Do not open your computer or attempt any repairs before reading the Important Product
Information Guide.
1. Remove external options. See “Replacing external options” on page 14.
2. Remove the computer cover. See “Removing the computer cover” on page 16.
3. Remove the front bezel. See “Replacing the front bezel” on page 17.
4. Remove the front I/O bracket. See “Replacing the power button board and the card reader” on page 27.
5. Pivot the drive bay assembly upward. See “Pivoting the drive bay assembly upward and downward” on
page 20.
6. Remove all memory modules. See “Replacing a memory module” on page 48.
7. Remove the heat sink and fan assembly. See “Replacing the heat sink and fan assembly” on page 50.
8. Remove the microprocessor. See “Replacing the microprocessor” on page 52.
9. Remove all PCI Express cards. See “Replacing a PCI Express card” on page 54.
10. Remove the Wi-Fi card. See “Replacing the Wi-Fi card” on page 38.
11. Remove the M.2 solid-state drive. See “Replacing the M.2 solid-state drive” on page 42.
12. Record the cable routing and cable connections, and then disconnect all cables from the system board.
See “System board” on page 5.
13. Replace the system board.
Notes:
• The numbers in the following figure show the locations of the screws instead of a specific order for
removing and reinstalling the screws.
• Handle the system board carefully by its edges.
• The failing system board must be returned with a microprocessor socket cover to protect the pins
during shipping and handling.
Chapter 4.Replacing hardware 59
14. Route and connect all the cables to the new system board.
15. Pivot the drive bay assembly downward and reinstall the removed parts. To complete the replacement,
see “Completing the parts replacement” on page 60.
Completing the parts replacement
After completing the installation or replacement for all parts, reinstall the computer cover and reconnect the
cables.
1. Ensure that all components have been reassembled correctly and that no tools or loose screws are left
inside your computer.
2. Ensure that the cables are routed correctly before reinstalling the computer cover. Keep cables clear of
the hinges and sides of the computer chassis to avoid interference when reinstalling the computer
cover.
3. Reinstall the computer cover.
60 M725s User Guide and Hardware Maintenance Manual
Figure 97. Reinstalling the computer cover
4. Reinstall external options. See “Replacing external options” on page 14.
5. Place the computer in an upright position.
6. If a locking device is available, use it to lock the computer.
7. Reconnect the external cables and power cords to the corresponding connectors on the computer.
Chapter 4.Replacing hardware 61
62 M725s User Guide and 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 products and/or the programs described in this publication at any
time without notice.
The products described in this document are not intended for use in implantation or other life support
applications where malfunction may result in injury or death to persons. The information contained in this
document does not affect or change Lenovo product specifications or warranties. Nothing in this document
shall operate as an express or implied license or indemnity under the intellectual property rights of Lenovo or
third parties. All information contained in this document was obtained in specific environments and is
presented as an illustration. The result obtained in other operating environments may vary.
Lenovo may use or distribute any of the information you supply in any way it believes appropriate without
incurring any obligation to you.
Any references in this publication to non-Lenovo Web sites are provided for convenience only and do not in
any manner serve as an endorsement of those Web sites. The materials at those Web sites are not part of the
materials for this Lenovo product, and use of those Web sites is at your own risk.
Any performance data contained herein was determined in a controlled environment. Therefore, the result
obtained in other operating environments may vary significantly. Some measurements may have been made
on development-level systems and there is no guarantee that these measurements will be the same on
generally available systems. Furthermore, some measurements may have been estimated through
extrapolation. Actual results may vary. Users of this document should verify the applicable data for their
specific environment.
© Copyright Lenovo 2018 63
64 M725s User Guide and Hardware Maintenance Manual
Appendix B. Trademarks
The following terms are trademarks of Lenovo in the United States, other countries, or both:
Lenovo
The Lenovo logo
ThinkCentre
The ThinkCentre logo
DisplayPort and Mini DisplayPort are trademarks of the Video Electronics Standards Association.
Other company, product, or service names may be trademarks or service marks of others.
© Copyright Lenovo 2018 65
66 M725s User Guide and Hardware Maintenance Manual
