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Lenovo U31-70 Hardware Maintenance Manual
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Lenovo U31-70 Hardware Maintenance Manual

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  • Page 1 Lenovo U31-70 Hardware Maintenance Manual...
  • Page 2 Note: • Before using this information and the product it supports, be sure to read the general information under “Notices” on page 75. First Edition (April 2015) © Copyright Lenovo 2015. All rights reserved. LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is delivered pursuant a General Services Administration “GSA” contract, use, reproduction, or disclosure is subject to restrictions set forth in Contract No. GS-35F-05925. © 2015 Lenovo...

  • Page 3: Table Of Contents

    Power-on password ..........24 Hard-disk password ..........24 Administrator password ........24 Power management ........25 Screen blank state ..........25 Putting the computer to sleep or shutting it down ..............25 Putting your computer to sleep ......25 Shutting down the computer ......25 Lenovo U31-70 ..........26 Specifications ..........26 Status indicators ........... 28 Hotkeys............29 FRU replacement notices ......30 Screw notices ..........30 Removing and replacing an FRU ....31 1010 Base cover ..........32 1020 Battery pack ..........34 1030 PCI Express Mini Card for wireless LAN .

  • Page 4: About This Manual

    • The product-specific section includes service, reference, and product-specific parts information. Important: This manual is intended only for trained servicers who are familiar with Lenovo products. Use this manual to troubleshoot problems effectively. Before servicing a Lenovo product, make sure to read all the information under “Safety information” on page 1 and “Important service information” on page 16.

  • Page 5: Safety Information

    Safety information Safety information This chapter presents the following safety information that you need to get familiar with before you service a Lenovo U31-70 computer: • “General safety” on page 2 • “Electrical safety” on page 3 • “Safety inspection guide” on page 5 • “Handling devices that are sensitive to electrostatic discharge” on page 6 • “Grounding requirements” on page 6 • “Safety notices: multilingual translations” on page 7 • “Laser compliance statement” on page 14...

  • Page 6: General Safety

    U31-70 Hardware Maintenance Manual General safety Follow these rules below to ensure general safety: • Observe a good housekeeping in the area where the machines are put during and after the 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 it. 4. Lift it by standing or pushing up with your leg muscles; this action could avoid 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 machine unsafe.

  • Page 7: Electrical Safety

    Safety information Electrical safety Observe the following rules when working on electrical equipments. Important: Use only approved tools and test equipments. Some hand tools have handles covered with a soft material that does not insulate you when working with live electrical currents. Many customers have rubber floor mats near their machines that contain small conductive fibers to decrease electrostatic discharges.
  • Page 8 U31-70 Hardware Maintenance Manual • 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 and similar units. (This practice ensures correct grounding of the units.) • If an electrical accident occurs: – Caution: do not become a victim yourself.

  • Page 9: Safety Inspection Guide

    The power cord should be the type specified in the parts list. 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-Lenovo alterations. Use good judgment as to the safety of any non-Lenovo 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.

  • Page 10: Handling Devices That Are Sensitive To Electrostatic Discharge

    U31-70 Hardware Maintenance Manual 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.

  • Page 11: Safety Notices: Multilingual Translations

    Safety information Safety notices: multilingual translations The safety notices in this section are provided in English, French, German, Hebrew, Italian, Japanese, and Spanish. Safety notice 1 Before the computer is powered on after FRU replacement, make sure all screws, springs, and other small parts are in place and are not left loose inside the computer.
  • Page 12 U31-70 Hardware Maintenance Manual Safety notice 2 DANGER Some standby batteries contain a small amount of nickel and cadmium. Do not disassemble a standby battery, recharge it, throw it into fire or water, or short- circuit it. Dispose of the battery as required by local ordinances or regulations.
  • Page 13 Safety information Safety notice 3 DANGER The battery pack contains small amounts of nickel. Do not disassemble it, throw it into fire or water, or short-circuit it. Dispose of the battery pack as required by local ordinances or regulations. Use only the battery in the appropriate parts listing when replacing the battery pack.
  • Page 14 U31-70 Hardware Maintenance Manual Safety notice 4 DANGER The lithium battery can cause a fire, an explosion, or a severe burn. Do not recharge it, remove its polarized connector, disassemble it, heat it above 100°C (212°F), incinerate it, or expose its cell contents to water. Dispose of the battery as required by local ordinances or regulations.
  • Page 15 Safety information Safety notice 5 If the LCD breaks and the fluid from inside the LCD gets into your eyes or on your hands, immediately wash the affected areas with water at least for 15 minutes. Seek medical care if any symptoms caused by the fluid are present after washing. Si le panneau d’affichage à...
  • Page 16 U31-70 Hardware Maintenance Manual Safety notice 6 DANGER To avoid shock, do not remove the plastic cover that protects the lower part of the inverter card. Afin d’éviter tout risque de choc électrique, ne retirez pas le cache en plastique protégeant la partie inférieure de la carte d’alimentation.
  • Page 17 Safety information Safety notice 8 DANGER Before removing any FRU, turn off the computer, unplug all power cords from electrical outlets, remove the battery pack, and then disconnect any interconnecting cables. Avant de retirer une unité remplaçable en clientèle, mettez le système hors tension, débranchez tous les cordons d’alimentation des socles de prise de courant, retirez la batterie et déconnectez tous les cordons d’interface.

  • Page 18: Laser Compliance Statement

    U31-70 Hardware Maintenance Manual Laser compliance statement Some models of Lenovo computer are equipped from the factory with an optical storage device such as a CD-ROM drive or a DVD-ROM drive. Such devices are also sold separately as options. If one of these drives is installed, it is certified in the U.S. to conform to the requirements of the Department of Health and Human Services 21 Code of Federal Regulations (DHHS 21 CFR) Subchapter J for Class 1 laser products. Elsewhere, the drive is certified to conform to the requirements of the International Electrotechnical Commission (IEC) 825 and CENELEC EN 60 825 for Class 1 laser products.
  • Page 19 Safety information A CD-ROM drive, a DVD-ROM drive, or any other storage device installed may contain an embedded Class 3A or Class 3B laser diode. Note the following: DANGER Emits visible and invisible laser radiation when open. Do not stare into the beam, do not view directly with optical instruments, and avoid direct exposure to the beam. Radiação por raio laser ao abrir. Não olhe fixo no feixe de luz, não olhe diretamente por meio de instrumentos óticos e evite exposição direta com o feixe de luz.

  • Page 20: Important Service Information

    Strategy for replacing FRUs Before replacing parts: Make sure that all software fixes, drivers, and BIOS downloads are installed before replacing any FRUs listed in this manual. After a system board is replaced, ensure that the latest BIOS is loaded to the system board before completing the service action. To download software fixes, drivers, and BIOS, follow the steps below: 1. Go to http://support.lenovo.com. 2. Enter the serial number or select a product or use Lenovo smart downloading. 3. Select the BIOS/Driver/Applications and download. 4. Follow the directions on the screen and install the necessary software.

  • Page 21: Strategy For Replacing A Hard Disk Drive

    Important service information Use the following strategy to prevent unnecessary expense for replacing and servicing FRUs: • If you are instructed to replace an FRU, but the replacement does not solve 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 of them, and replacing one of them does not solve 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. Attention: The setup configuration on the computer you are servicing may have been customized. Running Automatic Configuration may alter the settings. Note the current configuration settings (using the View Configuration option); then, when service has been completed, verify that those settings remain in effect.

  • Page 22: Important Information About Replacing Rohs Compliant Frus

    Electronic Equipment Directive (2002/95/EC) is a European Union legal requirement affecting the global electronics industry. RoHS requirements must be implemented on Lenovo products placed on the market after June 2006. Products on the market before June 2006 are not required to have RoHS compliant parts.

  • Page 23: General Checkout

    General checkout General checkout This chapter presents the following information: • “What to do first” on page 20 • “Power system checkout” on page 21 Before you go to the checkout, make sure to read the following important notes: Important notes: • Only certified trained personnel can service the computer. • Before replacing any FRU, read the entire page on removing and replacing FRUs. • Carefully remove screws for reuse when replacing FRUs. • Be extremely careful during such write operations as copying, saving, or formatting. Drives in the computer that you are servicing sequence might have been altered.

  • Page 24: What To Do First

    U31-70 Hardware Maintenance Manual What to do first When you do return an 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 servicer 2. Date of service 3. Date on which the machine failed 4. Date of purchase 5. Procedure index and page number in which the failing FRU was detected 6. Failing FRU name and part number 7. Machine type, model number, and serial number 8. Customer’s name and address Note for warranty: 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.

  • Page 25: Power System Checkout

    • If the computer does not charge during operation, go to “Checking operational charging”. To check the AC adapter, follow the steps below: 1. Unplug the AC adapter cable from the computer. 2. Measure the output voltage at the plug of the AC adapter cable. See the following figure: Voltage (V DC) Note: Output voltage for the AC adapter pin No. 2 may differ from the one you are servicing. 3. If the voltage is not correct, replace the AC adapter. 4. If the voltage is acceptable, do the following: • Replace the system board. • If the problem persists, go to “Lenovo U31-70” on page 26. Note: Noise from the AC adapter does not always indicate a defect. Checking operational charging To check whether the battery charges properly during operation, use a discharged battery pack or a battery pack that has less than 50% of the total power remaining when installed in the computer.

  • Page 26: Checking The Battery Pack

    U31-70 Hardware Maintenance Manual Perform operational charging. If the battery status indicator or icon does not light on, remove the battery pack and let it return to room temperature. Reinstall the battery pack. If the charge indicator or icon is still off, replace the battery pack. If the charge indicator still does not light on, replace the system board. Then reinstall the battery pack. If it is still not charged, go to the next section. Checking the battery pack Battery charging does not start until the Power Meter shows that less than 95% of the total power remains; under this condition the battery pack can charge to 100% of its capacity. This protects the battery pack from being overcharged or from having a shortened life. To check your battery, move your cursor to the Power Meter icon in the icon ® tray of the Windows taskbar and wait for a moment (but do not click it), and the percentage of battery power remaining is displayed. To get detailed information about the battery, double-click the Power Meter icon. Note: If the battery pack becomes hot, it may not be able to be charged.

  • Page 27: Related Service Information

    System. In order to save application files and the initial backed up files of the system, the hard disk in a Lenovo computer includes a hidden partition when it is shipped. If you need to restore the system to the point of your first boot up, just enter Lenovo OneKey Recovery System and run System Recovery. For details of OneKey Recovery System,...

  • Page 28: Passwords

    U31-70 Hardware Maintenance Manual Passwords As many as three passwords may be needed for any Lenovo computer: the power-on password (POP), the hard disk password (HDP), and the administrator password. If any of these passwords has been set, a prompt for it appears on the screen whenever the computer is turned on. The computer does not start until the password is entered.

  • Page 29: Power Management

    Related service information Power management Note: Power management modes are not supported for APM operating system. To reduce power consumption, the computer has three power management modes: screen blank, sleep (standby), and hibernation. Screen blank state If the time set on the “Turn off monitor” timer in the operating system expires, the LCD backlight turns off. You can also turn off the LCD backlight by pressing To end screen blank state and resume normal operation, press any key on the keyboard Putting the computer to sleep or shutting it down When you have finished working with your computer, you can put it to sleep or shut it down.

  • Page 30: Lenovo U31-70

    U31-70 Hardware Maintenance Manual Lenovo U31-70 This chapter presents the following product-specific service references and product-specific parts information: • “Specifications” on page 26 • “Status indicators” on page 28 • “Hotkeys” on page 29 • “FRU replacement notices” on page 30 • “Removing and replacing an FRU” on page 31 • “Locations” on page 60 • “Parts list” on page 62 Specifications The following table lists the specifications of the Lenovo U31-70: Table 1. Specifications Feature Description Processor • See the system properties of your computer, you can do this as...
  • Page 31 Lenovo U31-70 Table 1. Specifications (continued) Feature Description Ethernet (on the • 1,000 Mbps system board) Bluetooth • Combined in combo card wireless Keyboard • 6-row Lenovo Keyboard Touchpad • Multi-touch type Integrated • HD camera Battery • 2 cells, 35 Wh AC adapter • 20 V, Discrete Graphics 65 W, Integrated Graphics 45 W Pre-installed • DOS operating • Windows 8.1/10 (or similar update in 12 months) system...

  • Page 32: Status Indicators

    U31-70 Hardware Maintenance Manual Status indicators The system status indicators below show the computer status: Table 2. Status indicators Indicator Indicator Meaning status On (solid white) The battery has more than 20% charge. The battery has between 5% and 20% On (solid amber) charge. Blinking quickly (amber) The battery has less than 5% charge. The battery is being charged. When Battery status Blinking slowly (amber) the battery charge reaches 20%, the indicator blinking color will change to white. The battery has between 20% and 80% charge and is still charging. When the Blinking slowly (white) battery reaches 80% charge the light will stop blinking, but charging will continue until the battery is fully charged. On (solid white) The computer is powered on. Power status Blinking The computer is in sleep mode. indicator...

  • Page 33: Hotkeys

    Lenovo U31-70 Hotkeys You can access certain system settings quickly by pressing the appropriate hotkeys. Table 3. Hotkeys Mutes/unmutes the sound. Decreases the volume level. Increases the volume level. Closes the currently active window. Refreshes the desktop or the currently active window. Enables/disables the touchpad. Enables/disables Airplane mode. Displays all currently active apps. Turns on/off the backlight of the LCD screen. Toggles the display between the computer and an external device. Decreases the display brightness. Increases the display brightness.

  • Page 34: Fru Replacement Notices

    U31-70 Hardware Maintenance Manual FRU replacement notices This section presents notices related to removing and replacing parts. Read this section carefully before replacing any FRU. Screw notices Loose screws can cause a reliability problem. In the Lenovo 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.

  • Page 35: Removing And Replacing An Fru

    Lenovo U31-70 Removing and replacing an FRU This section presents exploded figures with the instructions to indicate how to remove and replace the FRU. Make sure to observe the following general rules: 1. Do not attempt 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 “FRU replacement notices” on page 30. 3. Begin by removing any FRUs that have to be removed before the failing FRU. Any of such FRUs are listed at the top of the page. Remove them in the order in which they are listed. 4. Follow the correct sequence in the steps to remove the FRU, as given in the figures by the numbers in square callouts. 5. When turning a screw to replace an FRU, turn it in the direction as given by the arrow in the figure. 6. When removing the FRU, move it in the direction as given by the arrow in the figure. 7. To put the new FRU in place, reverse the removal procedures and follow any of the notes that pertain to replacement. For information about...

  • Page 36: 1010 Base Cover

    U31-70 Hardware Maintenance Manual 1010 Base cover Figure 1. Removal steps of base cover Remove the screws 1. Step Screw (quantity) Color Torque M2 × 6 mm, Phillips-head, nylok-coated (10) Black/ 1.0~1.5 kgf*cm log low---log up & log low---io board---log up Silver & log low---mb---log up & log low---right side hinge---log up & log low---left side hinge--- klock bracket---log up Remove the base cover in the directions shown by arrows 2 and 3.
  • Page 37 Lenovo U31-70 Note: Applying labels to the base cover The new base cover FRU is shipped with a kit containing labels of several kinds. When you replace the base cover, you need to apply the following labels: The following labels need to be peeled off from the old base cover and put on the new base cover. Rating label Wlan/BT label for Malaysia/Indonesia Rating label Wlan/BT label for South Africa Rating label Wlan/BT label for Israel/US/CA/TW GML label Wlan/BT label for Brazil KCC label Indonesia D side label BIS label For some models, you also need to apply one or two FCC labels. Check the old base cover; if it has one or two FCC labels, find duplicates of them in the label kit and apply them to the new base cover.

  • Page 38: 1020 Battery Pack

    U31-70 Hardware Maintenance Manual 1020 Battery pack DANGER Only use the battery specified in the parts list for your computer. Any other battery could ignite or explode. For access, remove this FRU: • “1010 Base cover” on page 32 Figure 2. Removal steps of battery pack Release the speakers cables from the cable guides in the direction shown by arrows 1. Detach the battery pack connector in the direction shown by arrow 2, remove the screws 3.
  • Page 39 Lenovo U31-70 Figure 2. Removal steps of battery pack (continued) Remove the battery pack in the direction shown by arrow 4.

  • Page 40: 1030 Pci Express Mini Card For Wireless Lan

    U31-70 Hardware Maintenance Manual 1030 PCI Express Mini Card for wireless LAN For access, remove these FRUs in order: • “1010 Base cover” on page 32 • “1020 Battery pack” on page 34 Figure 3. Removal steps of PCI Express Mini Card for wireless LAN Disconnect the two wireless LAN cables (black, white) 1, and then remove the screw 2. In step 1, unplug the jacks by using the removal tool antenna RF connector (P/N: 08K7159), or pick up the connectors with your fingers and gently unplug them in the direction shown by the arrows. Notes: The wireless LAN card has 2 cables in step 1. The wireless LAN card in some models might have 3 cables in step 1. Step Screw (quantity) Color Torque M2 × 2.5 mm, Phillips-head, nylok-coated (1)
  • Page 41 Lenovo U31-70 Figure 3. Removal steps of PCI Express Mini Card for wireless LAN (continued) Remove the card in the direction shown by arrow 3. When installing: • In models with a wireless LAN card that has two antenna connectors, plug the black cable (1st) (MAIN) into the jack labeled MAIN, and the grey cable (2nd) (AUX) into the jack labeled AUX on the card. • In models with a wireless LAN card that has three antenna connectors, plug the black cable (1st) (MAIN) into the jack labeled 1, the grey cable (3rd) into the jack labeled 3, and the white cable (2nd) (AUX) into the jack labeled 2 on the card.

  • Page 42: 1040 Dimm

    U31-70 Hardware Maintenance Manual 1040 DIMM For access, remove these FRUs in order: • “1010 Base cover” on page 32 • “1020 Battery pack” on page 34 Figure 4. Removal steps of DIMM Release the two latches on both edges of the socket at the same time in the directions shown by arrows 1, and then unplug the DIMM in the direction shown by arrow 2. When installing: Insert the notched end of the DIMM into the socket. Push the DIMM firmly, and pivot it until it snaps into place. Make sure that it is firmly fixed in the slot and is difficult to move.

  • Page 43: 1050 Speakers

    Lenovo U31-70 1050 Speakers For access, remove these FRUs in order: • “1010 Base cover” on page 32 • “1020 Battery pack” on page 34 Figure 5. Removal steps of speakers Detach the speakers connector in the direction shown by arrow 1. Remove the screws 2. Then remove the speakers 3. Step Screw (quantity) Color Torque M2 × 2 mm, Phillips-head, nylok-coated (4) Black 1.0~1.5 kgf*cm speaker_l---log up & speaker_r---log up...

  • Page 44: 1060 Hard Disk Drive

    U31-70 Hardware Maintenance Manual 1060 Hard disk drive For access, remove these FRUs in order: • “1010 Base cover” on page 32 • “1020 Battery pack” on page 34 • “1050 Speakers” on page 39 Attention: • Do not drop the hard disk drive or apply any physical shock to it. The hard disk drive is sensitive to physical shock. Improper handling can cause damage and permanent loss of data. • Before removing the drive, suggest the customer to backup all the information on it if possible.
  • Page 45 Lenovo U31-70 Figure 6. Removal steps of hard disk drive (continued) Detach the HDD connector in the direction shown by arrow 2. Remove the hard disk drive from the slot in the direction shown by arrow 3. When installing: Make sure that the HDD connector is attached firmly. Remove the screws 4 and detach the metal frame from the hard disk drive. Step Screw (quantity) Color Torque M3 × 3 mm, Phillips-head, nylok-coated (4) Silver 1.5~2.0 kgf*cm hdd bracket---hdd module...

  • Page 46: 1070 Fan Assembly And Heat Sink Assembly

    U31-70 Hardware Maintenance Manual 1070 Fan assembly and Heat Sink assembly For access, remove these FRUs in order: • “1010 Base cover” on page 32 • “1020 Battery pack” on page 34 Figure 7. Removal steps of fan assembly and Heat Sink assembly Release the cables from the cable guides in the direction shown by arrows 1. When installing: Route the antenna cables along the cable guides. As you route the cables, make sure that they are not subjected to any tension. Tension could cause the cables to be damaged by the cable guides, or a wire to be broken.
  • Page 47 Lenovo U31-70 Figure 7. Removal steps of fan assembly and Heat Sink assembly (continued) Unplug the fan connector in the direction shown by arrow 2. Remove the screws 3. Step Screw (quantity) Color Torque M2 × 4 mm, Phillips head, nylok-coated (3) Black 1.0~1.5 kgf*cm fan---mb---log up & fan---log up When installing: Make sure that the connector is attached firmly. Remove the fan in the direction shown by arrow 4. Be careful not to damage...
  • Page 48 U31-70 Hardware Maintenance Manual Figure 7. Removal steps of fan assembly and Heat Sink assembly (continued) Remove the screws 5. Step Screw (quantity) Color Torque M2 × 4 mm, Phillips head, nylok-coated (5) Black 1.0~1.5 kgf*cm cpu thermal module---cpu plate & vga thermal module---MB Lift the heat sink in the direction shown by arrows 6.
  • Page 49 Lenovo U31-70 Figure 7. Removal steps of fan assembly and Heat Sink assembly (continued) When installing: Before you attach the fan assembly to the computer, apply thermal grease, at an amount of 0.2 grams, to the part shown in the figure above.

  • Page 50: 1080 Io Board, Dc-In Cable

    U31-70 Hardware Maintenance Manual 1080 IO board, DC-in cable For access, remove these FRUs in order: • “1010 Base cover” on page 32 • “1020 Battery pack” on page 34 • “1070 Fan assembly and Heat Sink assembly” on page 42 Figure 8. Removal steps of IO board, DC-in cable Detach the IO board connector in the directions shown by arrows 1 and 2. Remove the screw 3. Step Screw (quantity) Color Torque M2 × 2.5 mm, Phillips-head, nylok-coated (1) Silver 1.0~1.5 kgf*cm io board---log up When installing: Make sure that the connector is attached firmly.
  • Page 51 Lenovo U31-70 Figure 8. Removal steps of IO board, DC-in cable (continued) Remove the IO board in the direction shown by arrow 4. Unplug the DC-in cable connector in the directions shown by arrow 5. Then remove the DC-in cable in the direction shown by arrow 6. When installing: Make sure that the connector is attached firmly.

  • Page 52: 1090 System Board

    U31-70 Hardware Maintenance Manual 1090 System board Important notices for handling the system board: When handling the system board, bear the following in mind. • Be careful not to drop the system board on a bench top that has a hard surface, such as metal, wood, or composite.
  • Page 53 Lenovo U31-70 Figure 9. Removal steps of system board (continued) Remove the system board in the direction shown by arrow 6. Remove the screws 7. Step Screw (quantity) Color Torque M2 × 2.5 mm, Phillips-head, nylok-coated (2) Silver 1.0~1.5 kgf*cm RJ45 cover---M/B...
  • Page 54 U31-70 Hardware Maintenance Manual Figure 9. Removal steps of system board (continued) Remove the RJ-45 door in the direction shown by arrow 8. Note: • A new system board FRU is shipped with two absorbers. When you replace the system board, you need to stick these absorbers on it.

  • Page 55: 1100 Upper Case

    Lenovo U31-70 1100 Upper case For access, remove these FRUs in order: • “1010 Base cover” on page 32 • “1020 Battery pack” on page 34 • “1030 PCI Express Mini Card for wireless LAN” on page 36 • “1050 Speakers” on page 39 • “1060 Hard disk drive” on page 40 • “1070 Fan assembly and Heat Sink assembly” on page 42 • “1080 IO board, DC-in cable” on page 46 • “1090 System board” on page 48 Figure 10. Removal steps of upper case Remove the screws 1. Step Screw (quantity) Color Torque M2.5 × 5 mm, Phillips-head, nylok-coated (4) Black 1.5 ~ 2.0 kgf*cm left side hinge---log up & right side hinge---log up...
  • Page 56 U31-70 Hardware Maintenance Manual Figure 10. Removal steps of upper case (continued) Open the hinge in the direction shown by arrows 2. Remove the upper case from the LCD module in the directions shown by arrow 3.
  • Page 57 Lenovo U31-70 Figure 10. Removal steps of upper case (continued) Remove the screws 4. Then remove the touchpad module 5. Step Screw (quantity) Color Torque M2 × 2 mm, Phillips-head, nylok-coated (4) Black 1.0~1.5 kgf*cm tp bracket---log up...

  • Page 58: 1110 Lcd Unit

    U31-70 Hardware Maintenance Manual 1110 LCD unit For access, remove these FRUs in order: • “1010 Base cover” on page 32 • “1020 Battery pack” on page 34 • “1030 PCI Express Mini Card for wireless LAN” on page 36 • “1050 Speakers” on page 39 • “1060 Hard disk drive” on page 40 • “1070 Fan assembly and Heat Sink assembly” on page 42 • “1080 IO board, DC-in cable” on page 46 • “1090 System board” on page 48 • “1100 Upper case” on page 51 Figure 11. Removal steps of LCD unit Remove the screw pads 1, then remove the screws 2. Step Screw (quantity) Color Torque M2 × 3 mm, Phillips-head, nylok-coated (2) Silver 1.0~1.5 kgf*cm...
  • Page 59 Lenovo U31-70 Figure 11. Removal steps of LCD unit (continued) Remove the LCD front bezel in the direction shown by arrows 3. Remove the screws 4. Lift the LCD module slightly 5. Disconnect the connector in the direction shown by arrow 6. Then remove the LCD module. Step Screw (quantity) Color Torque M2 × 2.5 mm, Phillips-head, nylok-coated (4) Silver 1.0~1.5 kgf*cm lcd panel---lcd cover...
  • Page 60 U31-70 Hardware Maintenance Manual Figure 11. Removal steps of LCD unit (continued) Detach the camera connector in the direction shown by arrow 7. Remove the LCD cable in the direction shown by arrows 8. When installing: Make sure that the connector is attached firmly and that you do not pinch the antenna cables when you attach the LCD assembly. Route the LCD cable along the cable guides.

  • Page 61: 1120 Integrated Camera, Antenna Assembly And Lcd Hinges

    Lenovo U31-70 1120 Integrated camera, antenna assembly and LCD hinges For access, remove these FRUs in order: • “1010 Base cover” on page 32 • “1020 Battery pack” on page 34 • “1030 PCI Express Mini Card for wireless LAN” on page 36 • “1050 Speakers” on page 39 • “1060 Hard disk drive” on page 40 • “1070 Fan assembly and Heat Sink assembly” on page 42 • “1080 IO board, DC-in cable” on page 46 • “1090 System board” on page 48 • “1100 Upper case” on page 51 • “1110 LCD unit” on page 54 Figure 12. Removal steps of integrated camera, antenna assembly and LCD hinges Note: The integrated camera is stuck on the top center of the LCD cover.
  • Page 62 U31-70 Hardware Maintenance Manual Figure 12. Removal steps of integrated camera, antenna assembly and LCD hinges (continued) Peel off the adhesive tape securing the antenna boards, release the cables from the cable guide, and then remove the antenna assembly in the direction shown by arrows 2. Remove the screws 3. Step Screw (quantity) Color Torque M2 × 6 mm, Phillips-head, nylok-coated (6) Black 1.0~1.5 kgf*cm...
  • Page 63 Lenovo U31-70 Figure 12. Removal steps of integrated camera, antenna assembly and LCD hinges (continued) Remove the LCD hinges in the direction shown by arrows 4.

  • Page 64: Locations

    U31-70 Hardware Maintenance Manual Locations Front view and right-side view 1 Integrated camera 2 Built-in microphone 3 Computer display 4 Wireless LAN antennas 5 Ventilation slots 6 Touchpad 7 Novo button 8 USB 3.0 port 9 RJ-45 port J HDMI port K Power button...

  • Page 65: Bottom And Left-Side View

    Lenovo U31-70 Bottom and Left-side view 1 Speakers 2 System status indicators Note: For the description of each indicator, see “Status indicators” on page 28. 3 Combo audio jack 4 Memory card slot 5 USB 2.0 port 6 AC power adapter jack...

  • Page 66: Parts List

    U31-70 Hardware Maintenance Manual Parts list This section presents the following service parts: • “Overall” on page 63 • “LCD FRUs” on page 69 • “Miscellaneous parts” on page 71 • “AC adapters” on page 71 • “Screws” on page 71 • “Power cords” on page 72 Note: Each FRU is available for all types or models, unless specific types or models are specified. Attention: Do not attempt to replace an FRU on your own. If an FRU is damaged, contact a Lenovo authorized servicer or a marketing representative for replacement or repair. Only qualified technicians can inspect or repair this product.

  • Page 67: Overall

    Lenovo U31-70 Overall...
  • Page 68 U31-70 Hardware Maintenance Manual Table 4. Parts list—Overall U31-70 U31-70 No. FRU FRU no. a-c See “Miscellaneous parts” on page 71. LCD unit (see “LCD FRUs” on page 69). Upper Case C U31-70 BKL White US 5CB0J30905 ● ● Upper Case C U31-70 BKL White GK 5CB0J30982 ● ● Upper Case C U31-70BKL White INT'E 5CB0J30906 ● ● Upper Case C U31-70 BKL White KR 5CB0J30983 ● ● Upper Case C U31-70 BKL White CH 5CB0J30928 ● ● Upper Case C U31-70 BKL White RU 5CB0J31001 ●...
  • Page 69 Lenovo U31-70 Table 4. Parts list—Overall (continued) U31-70 U31-70 No. FRU FRU no. Upper Case C U31-70 BKL Red LA 5CB0J30970 ● ● Upper Case C U31-70 BKL Red CF-E 5CB0J30891 ● ● Upper Case C U31-70 BKL Red ND 5CB0J30966 ● ● Upper Case C U31-70 BKL Red FR 5CB0J30887 ● ● Upper Case C U31-70 BKL Red GR 5CB0J30959 ● ● Upper Case C U31-70 BKL Red BZ 5CB0J30882 ● ● Upper Case C U31-70BKL Red DUTCH 5CB0J30960 ●...
  • Page 70 U31-70 Hardware Maintenance Manual Table 4. Parts list—Overall (continued) U31-70 U31-70 No. FRU FRU no. Upper Case C U31-70 NBKL Red KR 5CB0J30885 ● ● Upper Case C U31-70 NBKL Red CH 5CB0J30961 ● ● Upper Case C U31-70 NBKL Red RU 5CB0J30888 ● ● Upper Case C U31-70 NBKL Red AR 5CB0J30965 ● ● Upper Case C U31-70 NBKL Red HE 5CB0J30926 ● ● Upper Case C U31-70 NBKL Red TH 5CB0J31010 ● ● Upper Case C U31-70NBKL Red INDIA 5CB0J30937 ●...
  • Page 71 Lenovo U31-70 Table 4. Parts list—Overall (continued) U31-70 U31-70 No. FRU FRU no. MB C U31-70 WIN I3-5010 UMA BKL 5B20J33164 ● MB C U31-70 NOK I3-5010UMA NBKL 5B20J33186 ● MB C U31-70 WIN I3-5010UMA NBKL 5B20J33181 ● MB C U31-70 NOK I3-5005 DIS BKL 5B20J33177 ● MB C U31-70 WIN I3-5005 DIS BKL 5B20J33172 ● MB C U31-70 NOK 5005UMA BKL NGC 5B20J33168 ● MB C U31-70 WIN 5005UMA BKL NGC 5B20J33162 ● MB C U31-70 NOK I3-5005UMA NBKL 5B20J33183 ● MB C U31-70 WIN I3-5005UMA NBKL 5B20J33165 ●...
  • Page 72 U31-70 Hardware Maintenance Manual Table 4. Parts list—Overall (continued) U31-70 U31-70 No. FRU FRU no. Hard disk drive, WD5000LPCX-24C6HT0 6G 7mm 5.4K 16200395 ● ● 500G HDD Hard disk drive, MQ01ABF050 6G 7mm 5.4K 500G HDD 16200433 ● ● Hard disk drive, ST500LM000 6G 7mm 500G+8G SSHD 16200391 ● ● Hard disk drive, ST500LM000 7mm 500G+8G ( for SIT) 5H20H24608 ● ● Hard disk drive, WDMN500Mh-2(6G) 7mm 1TB+(H)8G 16200681 ● ● 5400rpm Lower Case C U31-70 White 5CB0J30951 ●...

  • Page 73: Lcd Frus

    Lenovo U31-70 LCD FRUs In Lenovo U31-70, there is following type of LCD. • “13.3-in. HD LED”...
  • Page 74 U31-70 Hardware Maintenance Manual Table 5. Parts list—LCD FRUs U31-70 U31-70 No. FRU FRU no. LCD Bezel C U31-70 Black 5B30J30986 ● ● LCD Bezel C U31-70 White 5B30J30920 ● ● Panel, AUO B133XTN01.6 0A HD AG S NB 5D10H11004 ● ● Panel, IVO M133NWN1 R4 HD AG S NB 5D10H33278 ● ● Panel, BOE HB133WX1-402 HD AG S LED1 NB LCD 18201050 ● ● Panel, LGD LP133WF2-SPL1 FHD AG S NB 5D10H11579 ● ● Panel, SDC LTN133HL05-401 FHD AG S NB 5D10H30488 ●...

  • Page 75: Miscellaneous Parts

    Lenovo U31-70 Miscellaneous parts Table 6. Parts list—Miscellaneous parts U31-70 U31-70 FRU no. System miscellaneous parts: • ( a ) RJ45 Door C U31-70 White 5D30J30998 ● ● • ( a ) RJ45 Door C U31-70 Red 5D30J30924 ● ● • ( b ) HDD Bracket C U31-70 5B40J30985 ● ● Cable miscellaneous parts: • ( c ) DC-IN Cable C U31-70 5C10J30918 ●...

  • Page 76: Power Cords

    U31-70 Hardware Maintenance Manual Power cords A Lenovo power cord for a specific country or region is usually available only in that country or region: Table 9. Parts list—power cords U31-70 U31-70 Region UK 3PIN 145500000 • lux 0031+H03VV-F 0.75/3C+0011 1m Europe 3PIN 145500001 • lux 0033+H03VV-F 0.75/3C+0011 1m US 3PIN lux 145500002 • 0014+SPT-2 60°C 18/3C+0016 1m China 3PIN 145500003 • lux 0036+RVV 300/300 0.75/3C+0002 1m Indian 3PIN 145500004 • lux 0046+IS694 0.75/3C+0011 1m Japan 3PIN 145500005 • lux 0018(E)+VCTF 0.75/3C+0021 1m Australia 3PIN 145500006 • lux 0038+H03VV-F 0.75/3C+0011 1m...
  • Page 77 Lenovo U31-70 Table 9. Parts list—power cords (continued) U31-70 U31-70 Region Israel 3PIN 145000563 • Longwell LP-41+H03VV-F+LS-18 1m UL 3PIN 145000562 • Longwell LP-30B+SPT-2 18AWG+LS-18 1m UK 3PIN 145000561 • Longwell LP-61L+H03VV-F+LS-18 1m Indian 3PIN 145000560 • Longwell LP-67+BIS+LS-18 1m Italy 3PIN 145000559 • Longwell LP-22+H03VV-F+LS-18 1m Korea 3PIN 145000558 • Longwell LP-486+KTLH03VV-F+LS-5 1m Australia 3PIN 145000557 • Longwell LP-23A+LFC-3R+LS-18 1m Taiwan3PIN 145000556 • Longwell LP-71+VCTF+LS-33 1m...
  • Page 78 U31-70 Hardware Maintenance Manual Table 9. Parts list—power cords (continued) U31-70 U31-70 Region Brazil 3PIN 145000527 • VOLEX CH10S3+H03VV-F+VAC5S 1m Israel 3PIN 145000526 • VOLEX SI16S3+H03VV-F+VAC5S 1m CE 3PIN 145000525 • VOLEX M2511+HO3VV-F+VAC5S 1m CCC 3PIN 145000600 • LINETEK PC323+RVV300/300+LS15 1m Argentina 3PIN 145000599 • LINETEK LS15+H03VV-F+LP39 1m Danmark 3PIN 145000598 • LINETEK LS15+H03VV-F+LP-38 1m Switzerland 3PIN 145000597 • LINETEK LS15+H03VV-F+LP-37 1m...

  • Page 79: Notices

    Notices 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...

  • Page 80: Trademarks

    U31-70 Hardware Maintenance Manual 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...

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