® This manual contains service and reference information for the following ThinkPad products: ThinkPad X390 Yoga Machine types (MT): 20NN and 20NQ 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.
• 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. •...
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.
– 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.
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/...
Dynamic Configure To Order (CTO) 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.
Page 29
2. Type the Machine Type in the corresponding field to get a general FRU list. Or type the Serial Number for more detailed FRU information. Chapter 2 Important service information...
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.
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 program enables you to view system information and test some hardware devices in your computer, such as memory, storage devices, the LCD, and system board buses.
To check the ac power adapter, do the following: 1. Connect the computer to a power outlet and turn on the computer. 2. Start Lenovo Companion program or Lenovo Vantage, and then click Hardware Settings ➙ Power. The ac power adapter information is displayed.
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.
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.
If it has, it can be used for access to the hard disk 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 hard disk drive. The hard disk drive can be replaced for a scheduled fee.
To put the system back to operational status, the only Lenovo and Lenovo-authorized service solution would be to replace the storage drive with a scheduled fee.
Power management Sleep mode When the computer enters sleep mode, the following events occur in addition to what occurs in screen blank mode: • The LCD is powered off. • The storage drive is powered off. • The microprocessor stops. To put your computer into sleep mode, do the following: •...
When the power is turned on, the computer returns from hibernation mode and resumes operation. The hibernation file in the boot record on the storage drive is read, and system status is restored from the storage drive. Symptom-to-FRU index This section contains following information: •...
The battery installed is not supported by this system and Replace the battery. will not charge. Please replace the battery with the correct Lenovo battery for this system. Press the ESC key to continue. This system does not support batteries that are not Replace the battery.
Beep errors 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.
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.
1. Ensure that the computer is connected to ac power. Then, press the power button for about seven seconds to turn off the computer. 2. Press Fn, left Ctrl, and the power button at the same time. If the computer displays five solid colors in sequence across the entire screen, it indicates that the LCD functions normally.
Page 47
g. 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.
3. F1–F12 function keys 1. Go to Control Panel and view by Large icons or Small icons. 2. Click Keyboard or Lenovo - Keyboard Manager and select the option of your preference. Switch the function of the F1–F12 keys between the standard function and special function printed as an icon on each key.
Page 51
Enable or disable the built-in Bluetooth features. Open a keyboard setting page. Invoke the function defined by yourself: 1. Open the Start menu and click Lenovo Vantage. 2. Click Hardware Settings and then click Input. 3. Locate the Keyboard: User-defined Key section and follow the on-screen instructions to complete the setting.
Right 1. ThinkPad Pen Pro 5. USB 3.1 connector Gen 1 2. Power button 6. HDMI™ connector 3. microSD card slot 7. Security-lock slot 4. Nano-SIM card slot* * for selected models Locating FRUs and CRUs This topic introduces the following service parts: •...
Page 56
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:// .
Page 58
I/O bracket system board NFC card NFC cable Trackpad Trackpad cable TrackPoint pointing–stick nonslip cap Lenovo factory recovery USB key Miscellaneous parts (See “Miscellaneous parts” on page 55.) Power cord ac power adapter For selected models X390 Yoga Hardware Maintenance Manual...
Page 59
Note: The Lenovo factory recovery USB key is used to restore the Microsoft Windows operating system. They might not come with the computer, and a user might order them from https://pcsupport.lenovo.com/ , though additional shipping and handling fees might apply.
• Rubber sheet for smart card 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”...
Page 63
System board Item Connector (location) Internal cable required Cable connection Sensor board connector Sensor board cable Connect one end of the sensor board cable (internal) to the LCD panel assembly and the other end to this connector. Thermal fan connector Thermal fan assembly The thermal fan assembly comes with cable.
(external) Insert a microSD card into this slot Looking up FRU information For detailed FRU information, including part numbers, descriptions, and substitution part numbers, go to: https://support.lenovo.com/partslookup X390 Yoga Hardware Maintenance Manual...
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 .
• 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.
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.
Page 68
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.
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...
Attention: 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.
1020 Nano-SIM card tray (for selected models) Removal steps of the nano-SIM card tray 1030 Base cover assembly For access, remove these FRUs in order: • “1010 ThinkPad Pen Pro” on page 64 • “1020 Nano-SIM card tray (for selected models)” on page 65 Removal steps of the base cover assembly Chapter 8 Removing or replacing a FRU...
Applying labels to the base cover assembly The following illustration and table show the label areas and what labels are applied in each area. Genuine Microsoft label TAA GEO label Serial number label China CECP label IMEI label Korea/Mexico GEO label Asset tag China GEO label Asset tag...
Page 73
Important notices for replacing a 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. A 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.
Step Screw (quantity) Color Torque M2 × L2 mm, large flat (1) Silver 0.181 Nm (1.85 kgf-cm) When installing: Plug the red cable into the main connector on the card, and plug the blue cable into the auxiliary connector on the card. 1070 M.2 solid-state drive For access, remove these FRUs in order: •...
Page 76
Removal steps of the short M.2 solid-state drive Step Screw (quantity) Color Torque M2 × L2 mm, large flat (1) Silver 0.181 Nm (1.85 kgf-cm) Step Screw (quantity) Color Torque 0.181 Nm M2 × L2 mm, large flat (1) Silver (1.85 kgf-cm) Removal steps of the long M.2 solid-state drive Step...
1080 Coin-cell battery For access, remove these FRUs in order: • “1010 ThinkPad Pen Pro” on page 64 • “1020 Nano-SIM card tray (for selected models)” on page 65 • “1030 Base cover assembly” on page 65 • Disconnect the battery cable. See “1040 Battery” on page 66. Removal steps of the coin-cell battery When installing: Ensure that the coin-cell battery connector is attached firmly.
1100 Pen charger cable For access, remove these FRUs in order: • “1010 ThinkPad Pen Pro” on page 64 • “1020 Nano-SIM card tray (for selected models)” on page 65 • “1030 Base cover assembly” on page 65 • Disconnect the battery cable. See “1040 Battery” on page 66. •...
Step Screw (quantity) Color Torque M2 × L4 mm, large flat (1) Silver 0.181 Nm (1.85 kgf-cm) 1110 Thermal fan assembly For access, remove these FRUs in order: • “1010 ThinkPad Pen Pro” on page 64 • “1020 Nano-SIM card tray (for selected models)” on page 65 •...
Page 80
Note: Loosen the screws in ascending alphabetical order ( ) as shown. When installing: • Always wear fingerstalls when handling the thermal fan assembly. Do not touch or hold any part of the thermal fan assembly with bare fingers. • Before you attach the thermal fan assembly to the computer, apply thermal grease, at an amount of 0.2 grams, on the part marked as shown in the following illustrations.
• Do not apply pressure on the top and base covers of the thermal fan assembly. • Do not press the heat pipe. Hold both sides of the heat pipe when you take the thermal fan assembly. • Do not shake or drop the thermal fan assembly. •...
Page 82
• “1020 Nano-SIM card tray (for selected models)” on page 65 • “1030 Base cover assembly” on page 65 • “1040 Battery” on page 66 • “1090 Speaker assembly” on page 71 Removal steps of the smart-card reader and the smart-card-reader cable Step Screw (quantity) Color...
When installing: When installing a new smart card reader, paste the rubber sheet to the new smart card reader as shown. Removal steps of the dummy smart-card Step Screw (quantity) Color Torque M2 × L3 mm, thin head (2) Black 0.181 Nm (1.85 kgf-cm) 1140 Fingerprint reader bracket, fingerprint reader cable, and fingerprint...
Removal steps of the fingerprint reader bracket, fingerprint reader cable, and fingerprint reader Step Screw (quantity) Color Torque Black 0.181 Nm M2 × L3 mm, thin head (1) (1.85 kgf-cm) 1150 Trackpad and trackpad cable For access, remove these FRUs in order: •...
Removal steps of the trackpad and trackpad cable Step Screw (quantity) Color Torque M2 × L2 mm, flat-head, nylon-coated (4) Silver 0.181 Nm (1.85 kgf-cm) 1160 System board Important notices for handling the system board When handling the system board, read the following: •...
Page 86
Note: Dropping a system board from a height of as little as 0.15 m (6 inches) so that it falls flat on a hard bench can subject the accelerometer to as much as 6000 G's of shock. • Be careful not to drop the system board on a bench top that has a hard surface, such as metal, wood, or composite.
Page 87
Step Screw (quantity) Color Torque Black 0.181 Nm M2 × L5 mm, flat-head, nylon-coated (4) (1.85 kgf-cm) Chapter 8 Removing or replacing a FRU...
Note: Service account and password are required for downloading the sensor calibration tool and the instruction. 1. Go to and follow the instructions on the screen. https://support.lenovo.com/us/en/documents/HT103119 2. Locate the sensor calibration tool and select the corresponding file name to download the sensor calibration tool or the instruction. 1170 Keyboard assembly For access, remove these FRUs in order: •...
1200 LCD unit For access, remove these FRUs in order: • “1010 ThinkPad Pen Pro” on page 64 • “1020 Nano-SIM card tray (for selected models)” on page 65 • “1030 Base cover assembly” on page 65 • “1040 Battery” on page 66 •...
Page 90
Step Screw (quantity) Color Torque Black 0.181 Nm M2 × L5 mm, flat-head (2) (1.85 kgf-cm) When installing: Ensure that you attach the connectors 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.
2010 Strip bezel Removal steps of the strip bezel Step Screw (quantity) Color Torque M2 x L3 mm, thin head (2) Black 0.181 Nm (1.85 kgf-cm) 2020 LCD panel assembly For access, remove these FRUs: • “1010 ThinkPad Pen Pro” on page 64 •...
Removal steps of the LCD panel assembly Step Screw (quantity) Color Torque M2 × L3 mm, thin head (1) Black 0.181 Nm (1.85 kgf-cm) 2030 Camera cable, ThinkShutter, and camera board For access, remove these FRUs: • “1010 ThinkPad Pen Pro” on page 64 •...
Removal steps of the camera cable, ThinkShutter, and camera board When installing: Ensure that the connectors are attached firmly. 2040 Sensor board For access, remove these FRUs: • “1010 ThinkPad Pen Pro” on page 64 • “1020 Nano-SIM card tray (for selected models)” on page 65 •...
Removal steps of the sensor board 2050 LED cable (for models with wireless-LAN only) For access, remove these FRUs in order: • “1010 ThinkPad Pen Pro” on page 64 • “1020 Nano-SIM card tray (for selected models)” on page 65 •...
Removal steps of the LED cable 2060 Hinges For access, remove these FRUs in order: • “1010 ThinkPad Pen Pro” on page 64 • “1020 Nano-SIM card tray (for selected models)” on page 65 • “1030 Base cover assembly” on page 65 •...
• “1030 Base cover assembly” on page 65 • Disconnect the battery cable. See “1040 Battery” on page 66. • “1200 LCD unit” on page 83 • “2010 Strip bezel” on page 85 • “2020 LCD panel assembly” on page 85 Removal steps of the sensor board cable and LED cable assembly 2090 Wireless antenna kit For access, remove these FRUs in order:...
Page 98
Removal steps of the wireless antenna kit (for models with both wireless-WAN and wireless-LAN) X390 Yoga Hardware Maintenance Manual...
Page 99
Wireless-WAN auxiliary antenna (blue) Wireless-LAN main antenna (gray) Wireless-WAN main antenna (red) Wireless-LAN auxiliary antenna (black) Removal steps of the wireless antenna kit (for models with wireless-LAN only) Chapter 8 Removing or replacing a FRU...
Wireless-LAN main antenna (gray) Wireless-LAN auxiliary antenna (black) When installing: 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. 2100 LCD rear cover assembly For access, remove these FRUs in order: •...
Page 101
• “2090 Wireless antenna kit” on page 91 Chapter 8 Removing or replacing a FRU...
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.
Page 104
EU contact: Lenovo, Einsteinova 21, 851 01 Bratislava, Slovakia Trademarks LENOVO, LENOVO logo, THINKPAD, THINKPAD logo and TRACKPOINT are trademarks of Lenovo. Microsoft and Windows are trademarks of the Microsoft group of companies. Intel and Optane are trademarks of Intel Corporation or its subsidiaries in the U.S. and/or other countries. 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.
Page 106
Abbreviation Term POST power-on self-test random-access memory radio frequency RFID radio-frequency identification ring indicator registered jack SATA Serial Advanced Technology Attachment subscriber identity module supervisor password TFTs thin-film transistors UEFI Unified Extensible Firmware Interface Universal Serial Bus UUID universally unique identifier video graphics array VRAM video random-access memory...
Page 108
Part Number: SP40K05260 Printed in (1P) P/N: SP40K05260 *1PSP40K05260*...