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Lenovo Yoga C940-14IIL Hardware Maintenance Manual
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Lenovo Yoga C940-14IIL Hardware Maintenance Manual

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Lenovo Yoga C940–14IIL
Hardware Maintenance Manual

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Summary of Contents for Lenovo Yoga C940-14IIL

  • Page 1 Lenovo Yoga C940–14IIL Hardware Maintenance Manual...
  • Page 2 First Edition (July 2019) © Copyright Lenovo 2019.

  • Page 3: Table Of Contents

    Trademarks ....lxi Service tools ....© Copyright Lenovo 2019...
  • Page 4 Lenovo Yoga C940–14IIL Hardware Maintenance Manual...

  • Page 5: About This Manual

    Important: • This manual is intended only for trained service technicians who are familiar with Lenovo products. • Before servicing a Lenovo product, be sure to read all the information under Chapter 1 “Safety information” on page 1. © Copyright Lenovo 2019...
  • Page 6 Lenovo Yoga C940–14IIL Hardware Maintenance Manual...

  • Page 7: Chapter 1. Safety Information

    • Do not work alone under hazardous conditions or near equipment that has hazardous voltages. • Disconnect all power before: – Performing a mechanical inspection – Working near power supplies © Copyright Lenovo 2019...

  • Page 8: Safety Inspection Guide

    This guide addresses only those items. You should use good judgment to identify potential safety hazards due to attachment of non-Lenovo features or options not covered by this inspection guide.

  • Page 9: Handling Devices That Are Sensitive To Electrostatic Discharge

    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.

  • Page 10: Grounding Requirements

    The safety notices in this section are provided in the following languages: • English • Arabic • Brazilian Portuguese • French • German • Hebrew • Japanese • Korean • Spanish • Traditional Chinese DANGER DANGER DANGER Lenovo Yoga C940–14IIL Hardware Maintenance Manual...
  • Page 11 DANGER DANGER DANGER DANGER DANGER Chapter 1 Safety information...
  • Page 12 Lenovo Yoga C940–14IIL Hardware Maintenance Manual...
  • Page 13 PERIGO PERIGO PERIGO Chapter 1 Safety information...
  • Page 14 PERIGO PERIGO PERIGO PERIGO PERIGO Lenovo Yoga C940–14IIL Hardware Maintenance Manual...
  • Page 15 DANGER DANGER DANGER DANGER Chapter 1 Safety information...
  • Page 16 DANGER DANGER DANGER DANGER VORSICHT Lenovo Yoga C940–14IIL Hardware Maintenance Manual...
  • Page 17 VORSICHT VORSICHT VORSICHT VORSICHT Chapter 1 Safety information...
  • Page 18 VORSICHT VORSICHT VORSICHT Lenovo Yoga C940–14IIL Hardware Maintenance Manual...
  • Page 19 Chapter 1 Safety information...
  • Page 20 Lenovo Yoga C940–14IIL Hardware Maintenance Manual...
  • Page 21 Chapter 1 Safety information...
  • Page 22 Lenovo Yoga C940–14IIL Hardware Maintenance Manual...
  • Page 23 Chapter 1 Safety information...
  • Page 24 Lenovo Yoga C940–14IIL Hardware Maintenance Manual...
  • Page 25 Chapter 1 Safety information...
  • Page 26 Lenovo Yoga C940–14IIL Hardware Maintenance Manual...

  • Page 27: Chapter 2. General Checkout

    • Plastic parts, latches, pins, or connectors that have been cracked or broken by excessive force • Damage caused by liquid spilled into the system • Damage caused by the improper insertion of a personal-computer card (PC card) or the installation of an incompatible card © Copyright Lenovo 2019...

  • Page 28: Cru List

    • Check for obvious damage to a hard disk drive. If the spindle of a hard disk drive becomes noisy, the hard disk drive might have been dropped or subject to excessive force. CRU list Table 1. Model: Lenovo Yoga C940-14IIL (Machine type: 81Q9) Type ac power adapter...

  • Page 29: Chapter 3. Identifying Fru (Cru)

    Chapter 3. Identifying FRU (CRU) Locate FRU and CRU The exploded illustrations help Lenovo service technicians identify FRU or CRU that they may need to replace when servicing a customer’s computer. © Copyright Lenovo 2019...
  • Page 30 Major FRU Figure 1. Lenovo Yoga C940-14IIL system exploded view Table 2. FRU (CRU) categories FRU (CRU) category Upper case (with keyboard) Lenovo Yoga C940–14IIL Hardware Maintenance Manual...
  • Page 31 Table 2. FRU (CRU) categories (continued) System board M.2 solid-state drive (SSD) Thermal module Speakers Antenna module Battery pack Lower case Rubber foot Pen holder Bottom button board Power button board Chapter 3 Identifying FRU (CRU)
  • Page 32 LCD FRU Figure 2. Lenovo Yoga C940-14IIL LCD exploded view Table 3. FRU (CRU) categories FRU (CRU) category LCD panel Hinge cover Lenovo Yoga C940–14IIL Hardware Maintenance Manual...
  • Page 33 Table 3. FRU (CRU) categories (continued) Bezel deco back Soundbar/hinge/EDP cable assembly MIC FPC with camera cable Transfer FPC LCD cover Chapter 3 Identifying FRU (CRU)
  • Page 34 Lenovo Yoga C940–14IIL Hardware Maintenance Manual...

  • Page 35: Chapter 4. Removing A Fru Or Cru

    Chapter 4. Removing a FRU or CRU Service tools The following table lists tools for servicing Lenovo computers. Tools with a cross mark are needed for serving the product models as described by this publication. Prepare them before you service the product.

  • Page 36: Remove The Active Pen

    Step 1. Pull the active pen out of the slot. Figure 3. Pull the active pen out of the slot Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: Active pen Lenovo Yoga C940–14IIL Hardware Maintenance Manual...

  • Page 37: Remove The Lower Case

    Remove the lower case Make sure the following FRU (or CRU) has been removed. “Remove the active pen” on page 30 Step 1. Disconnect all power cords, cables and USB devices from the computer. Step 2. Place the computer upside down on a flat surface. Step 3.

  • Page 38: Remove The Battery Pack

    Screw specifications Number of screws M2 x 7.9 M2 x 3 Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: Lower case Remove the battery pack Make sure the following FRU (or CRU) have been removed.

  • Page 39: Remove The Speakers

    M2 x 3 Step 3. Remove the battery pack. Figure 8. Remove the battery pack Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: Battery pack Remove the speakers Make sure the following FRU (CRU) have been removed.
  • Page 40 Disconnect the speakers cables from the system board. Then, remove four screws. Figure 10. Disconnect the speakers cables and remove four screws Screw specifications Number of screws M2 x 2 Step 3. Remove the speakers carefully. Lenovo Yoga C940–14IIL Hardware Maintenance Manual...

  • Page 41: Remove The M.2 Solid-State Drive

    Figure 11. Remove the speakers Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: Speakers Remove the M.2 solid-state drive Make sure the following FRU (or CRU) have been removed. “Remove the active pen” on page 30 “Remove the lower case”...

  • Page 42: Remove The Shield Cover

    Screw specifications Number of screw M2 x 2 Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part: M.2 solid-state drive Remove the shield cover Make sure the following FRU (CRU) have been removed. “Remove the active pen” on page 30 “Remove the lower case”...

  • Page 43: Remove The Thermal Module

    Remove the shield cover. Figure 14. Remove the shield cover Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part: Shield cover Remove the thermal module Make sure the following FRU (or CRU) have been removed.
  • Page 44 Attention: Do not pull the cable. Use your fingernail to disconnect the cable. Figure 15. Disconnect the battery connector Step 2. Disconnect the fan connectors. Figure 16. Disconnect the fan connectors Step 3. Remove five screws. Lenovo Yoga C940–14IIL Hardware Maintenance Manual...

  • Page 45: Remove The System Board

    Remove the thermal module. Figure 18. Remove the thermal module Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part: Thermal module Remove the system board Make sure the following FRU (or CRU) have been removed.
  • Page 46 “Remove the M.2 solid-state drive” on page 35 “Remove the thermal module” on page 37 Step 1. Disconnect all cables connected to the system board. Figure 19. Disconnect all cables Step 2. Remove eight screws. Figure 20. Remove eight screws Lenovo Yoga C940–14IIL Hardware Maintenance Manual...

  • Page 47: Remove The Bottom Button Board

    Remove the system board. Figure 21. Remove the system board Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part: System board Remove the bottom button board Make sure the following FRU (or CRU) have been removed.
  • Page 48 Figure 22. Disconnect the battery cable Step 2. Disconnect the cable from the bottom button board. Figure 23. Disconnect the cable Step 3. Remove one screw. Lenovo Yoga C940–14IIL Hardware Maintenance Manual...

  • Page 49: Remove The Pen Holder And Power Button Board

    Remove the bottom button board. Figure 25. Remove the bottom button board Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part: Bottom button board Remove the pen holder and power button board Make sure the following FRU (or CRU) have been removed.
  • Page 50 Disconnect the battery cable from the system board. Attention: Do not pull the cable. Use your fingernail to disconnect the cable. Figure 26. Disconnect the battery cable Step 2. Remove two screws. Figure 27. Remove two screws Lenovo Yoga C940–14IIL Hardware Maintenance Manual...
  • Page 51 Screw specifications Number of screws M2 x 3 Step 3. Remove the pen holder with the power button board. Figure 28. Remove the pen holder with the power button board Step 4. Disconnect the cable from the power button board. Chapter 4 Removing a FRU or CRU...
  • Page 52 Figure 29. Disconnect the cable Step 5. Remove one screw. Figure 30. Remove one screw Screw specifications Number of screw M2 x 2 Lenovo Yoga C940–14IIL Hardware Maintenance Manual...

  • Page 53: Remove The Antenna Module And Upper Case

    Step 6. Remove the power button board form the pen holder. Figure 31. Remove the power button board Go to to look up the Lenovo part numbers of the following https://support.lenovo.com/partslookup replacement parts: Pen holder Power button board Remove the antenna module and upper case Make sure the following FRU (CRU) have been removed.
  • Page 54 Figure 32. Disconnect the battery cable Step 2. Disconnect the EDP cable, camera cable and transfer board cable from the system board.. Figure 33. Disconnect the cables Step 3. Disconnect the antenna cables. Lenovo Yoga C940–14IIL Hardware Maintenance Manual...
  • Page 55 Figure 34. Disconnect the antenna cables Step 4. Remove nine screws. Figure 35. Remove nine screws Screw specifications Number of screws M1.6 x 2.9 Step 5. Remove the antenna module. Chapter 4 Removing a FRU or CRU...
  • Page 56 Remove six screws. Figure 37. Remove six screws Screw specifications Number of screws M2 x 4.4 Step 7. Rotate the LCD module to an angle of 270 degrees and then remove the upper case. Lenovo Yoga C940–14IIL Hardware Maintenance Manual...

  • Page 57: Remove The Hinge Cover And Bezel Deco Back

    Figure 38. Remove the upper case Go to https://support.lenovo.com/partslookup to look up the Lenovo part numbers of the following replacement parts: Antenna module Upper case Remove the hinge cover and bezel deco back Make sure the following FRU (or CRU) have been removed.
  • Page 58 Figure 39. Remove the hinge cover Step 2. Remove seven screws. Figure 40. Remove seven screws Screw specifications Number of screws M1.6 x 2.9 Step 3. Remove the bezel deco back. Lenovo Yoga C940–14IIL Hardware Maintenance Manual...

  • Page 59: Remove The Lcd Panel

    Figure 41. Remove the bezel deco back Go to to look up the Lenovo part numbers of the following https://support.lenovo.com/partslookup replacement parts: Hinge cover Bezel deco back Remove the LCD panel Make sure the following FRU (CRU) have been removed.

  • Page 60: Remove The Hinge Module

    Step 2. Turn the LCD panel and disconnect the cables. Figure 43. Turn the LCD panel and disconnect the cables Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: LCD panel Remove the hinge module Make sure the following FRU (or CRU) have been removed.
  • Page 61 Number of screws M2 x 3 Step 2. Remove the hinge module. Figure 45. Remove the hinge module Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: Chapter 4 Removing a FRU or CRU...

  • Page 62: Remove The Camera

    Step 1. Disconnect the camera cables and remove the camera. Figure 46. Disconnect the camera cables and remove the camera Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: Camera Lenovo Yoga C940–14IIL Hardware Maintenance Manual...

  • Page 63: Appendix A. Laser Etched Labels

    Appendix A. Laser etched labels Figure 47. Engraved (laser etched) text for Lenovo Yoga C940–14IIL © Copyright Lenovo 2019...
  • Page 64 Figure 48. Engraved (laser etched) text for Lenovo Yoga C940–14IIL Lenovo Yoga C940–14IIL Hardware Maintenance Manual...
  • Page 65 Figure 49. Engraved (laser etched) text for Lenovo Yoga C940–14IIL Appendix A. Laser etched labels...
  • Page 66 Lenovo Yoga C940–14IIL Hardware Maintenance Manual...

  • Page 67: Trademarks

    Trademarks LENOVO and the LENOVO logo are trademarks of Lenovo. All other trademarks are the property of their respective owners. © 2019 Lenovo.

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