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Lenovo Yoga C740 Series Hardware Maintenance Manual

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Lenovo Yoga C740 series
Hardware Maintenance Manual

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  Summary of Contents for Lenovo Yoga C740 Series

  • Page 1 Lenovo Yoga C740 series Hardware Maintenance Manual...
  • Page 2 First Edition (August 2019) © Copyright Lenovo 2019.
  • Page 3: Table Of Contents

    Trademarks ....li CRU ....25 © Copyright Lenovo 2019...
  • Page 4 Lenovo Yoga C740 series 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. Note: The actual product might be slightly different from the illustrations provided in this manual. The product used for illustrations is Lenovo Yoga C740-15IML.
  • Page 6 Lenovo Yoga C740 series 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 C740 series Hardware Maintenance Manual...
  • Page 11 DANGER DANGER DANGER DANGER DANGER Chapter 1 Safety information...
  • Page 12 Lenovo Yoga C740 series Hardware Maintenance Manual...
  • Page 13 PERIGO PERIGO PERIGO Chapter 1 Safety information...
  • Page 14 PERIGO PERIGO PERIGO PERIGO PERIGO Lenovo Yoga C740 series Hardware Maintenance Manual...
  • Page 15 DANGER DANGER DANGER DANGER Chapter 1 Safety information...
  • Page 16 DANGER DANGER DANGER DANGER VORSICHT Lenovo Yoga C740 series Hardware Maintenance Manual...
  • Page 17 VORSICHT VORSICHT VORSICHT VORSICHT Chapter 1 Safety information...
  • Page 18 VORSICHT VORSICHT VORSICHT Lenovo Yoga C740 series Hardware Maintenance Manual...
  • Page 19 Chapter 1 Safety information...
  • Page 20 Lenovo Yoga C740 series Hardware Maintenance Manual...
  • Page 21 Chapter 1 Safety information...
  • Page 22 Lenovo Yoga C740 series Hardware Maintenance Manual...
  • Page 23 Chapter 1 Safety information...
  • Page 24 Lenovo Yoga C740 series Hardware Maintenance Manual...
  • Page 25 Chapter 1 Safety information...
  • Page 26 Lenovo Yoga C740 series 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 C740-14IML (Machine type: 81TC) 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. Figure 1. Lenovo Yoga C740-15IML exploded view © Copyright Lenovo 2019...
  • Page 30 RTC battery I/O board with cable Thermal module Speakers Battery pack Lower case SSD AL foil mylar Audio board with cable (for Lenovo Yoga C740-15IML only) WLAN card Hinge cap rubber L Removable tape L MIC FFC MIC board L Camera...
  • Page 31: 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 32: Remove The Lower Case

    Make sure the computer has been shut down before servicing the computer. Step 1. Place the computer upside down on a flat surface. Step 2. Remove nine screws. Figure 2. Remove nine screws Lenovo Yoga C740 series Hardware Maintenance Manual...
  • Page 33: Remove The Battery Pack

    Pry up the latches and then remove the lower case. Figure 3. Pry up the latches and remove the lower case Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part: Lower case Remove the battery pack Make sure the following FRU (or CRU) has been removed.
  • Page 34: Remove The Rtc Battery

    M2.0 x L3.5 x D4.5 x T0.5 Step 2. Remove the battery pack. Figure 5. 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 RTC battery Make sure the following FRU (or CRU) have been removed.
  • Page 35: Remove The Thermal Module

    Step 1. Disconnect the cable from the I/O board and remove the RTC battery. Figure 6. Disconnect the cable and remove the RTC battery Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: RTC battery Remove the thermal module Make sure the following FRU (or CRU) have been removed.
  • Page 36 Figure 7. Disconnect the fan connectors Step 2. Remove six screws. Figure 8. Remove six screws Screw specifications Number of screws M2.0 x L3.5 x D4.5 x T0.5 Step 3. Remove the conductive tape. Lenovo Yoga C740 series Hardware Maintenance Manual...
  • Page 37: Remove The I/O Board With Cable

    Figure 9. Remove the conductive tape Step 4. Remove the thermal module. Figure 10. Remove the thermal module Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: Thermal module Remove the I/O board with cable Make sure the following FRU (or CRU) have been removed.
  • Page 38 Figure 11. Disconnect the cables from the I/O board Step 2. Remove two screws. Figure 12. Remove two screws Screw specifications Number of screws M2.0 x L3.5 x D4.5 x T0.5 Step 3. Remove the I/O board with cable. Lenovo Yoga C740 series Hardware Maintenance Manual...
  • Page 39: Remove The Wlan Card

    Figure 13. Remove the I/O board with cable Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: I/O board with cable Remove the WLAN card Make sure the following FRU (or CRU) have been removed.
  • Page 40 Pull the WLAN card out of the slot. Figure 16. Pull the WLAN card out of the slot Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part: WLAN card Lenovo Yoga C740 series Hardware Maintenance Manual...
  • Page 41: Remove The Solid-State Drive

    Remove the solid-state drive Make sure the following FRU (or CRU) have been removed. “Remove the lower case” on page 26 “Remove the battery pack” on page 27 Step 1. Remove one screw. Figure 17. Remove one screw Screw specifications Number of screw M2 x L2 x D4.5 x T0.8 Step 2.
  • Page 42: Remove The System Board

    Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: Solid-state drive Remove the system board Make sure the following FRU (or CRU) have been removed. “Remove the lower case” on page 26 “Remove the battery pack” on page 27 “Remove the RTC battery”...
  • Page 43 M2 x L2 x D4.5 x T0.8 Step 3. 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 Chapter 4 Removing a FRU or CRU...
  • Page 44: Remove The Speakers

    Disconnect the speaker cable from the system board. Figure 22. Disconnect the speaker cable Step 2. Remove four screws. Figure 23. Remove four screws Screw specifications Number of screws M2 x L2.2 x D8 x T0.5 Lenovo Yoga C740 series Hardware Maintenance Manual...
  • Page 45: Remove The Audio Board

    Step 3. Carefully remove the speakers. Figure 24. Remove the speakers Go to to look up the Lenovo part numbers of the following https://support.lenovo.com/partslookup replacement parts: Speakers Remove the audio board Make sure the following FRU (CRU) have been removed.
  • Page 46: Remove The Upper Case (With Keyboard)

    Remove the audio board. Figure 26. Remove the audio board Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part: Audio board Remove the upper case (with keyboard) Make sure the following FRU (CRU) have been removed.
  • Page 47 “Remove the lower case” on page 26 “Remove the battery pack” on page 27 “Remove the RTC battery” on page 28 “Remove the thermal module” on page 29 “Remove the I/O board with cable” on page 31 “Remove the WLAN card” on page 33 “Remove the solid-state drive”...
  • Page 48: Remove The Lcd Panel

    Figure 28. Remove the upper case Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: Upper case (with keyboard) Remove the LCD panel Make sure the following FRU (CRU) have been removed. “Remove the lower case” on page 26 “Remove the battery pack”...
  • Page 49 Figure 29. Remove the strip cover Step 2. Pull out the adhesive tapes. Figure 30. Pull out the adhesive tapes Step 3. Remove four screws. Chapter 4 Removing a FRU or CRU...
  • Page 50 M1.6 x L2.5 x D2.5 x T0.5 Step 4. Turn the LCD panel so that the rear side of LCD panel is facing up. Figure 32. Turn the LCD panel Step 5. Disconnect the cables from the LCD panel. Lenovo Yoga C740 series Hardware Maintenance Manual...
  • Page 51: Remove The Camera And Mic Board

    Figure 33. Disconnect the cables from the LCD panel Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: LCD panel Remove the camera and MIC board Make sure the following FRU (CRU) have been removed.
  • Page 52: Remove The Hinges

    Step 2. Remove the camera and the MIC board. Figure 35. Remove the camera and the MIC board Go to to look up the Lenovo part numbers of the following https://support.lenovo.com/partslookup replacement parts: Camera and MIC board Remove the hinges Make sure the following FRU (CRU) have been removed.
  • Page 53 “Remove the thermal module” on page 29 “Remove the I/O board with cable” on page 31 “Remove the WLAN card” on page 33 “Remove the solid-state drive” on page 35 “Remove the system board” on page 36 “Remove the speakers” on page 38 “Remove the audio board”...
  • Page 54: Remove The Edp Cable And Ffc

    Figure 37. Remove the hinges Go to to look up the Lenovo part numbers of the following https://support.lenovo.com/partslookup replacement parts: Hinges Remove the EDP cable and FFC Make sure the following FRU (CRU) have been removed. “Remove the lower case” on page 26 “Remove the battery pack”...
  • Page 55 Figure 38. Remove the EDP cable and FFC Go to to look up the Lenovo part numbers of the following https://support.lenovo.com/partslookup replacement parts: EDP cable and FFC Chapter 4 Removing a FRU or CRU...
  • Page 56 Lenovo Yoga C740 series Hardware Maintenance Manual...
  • Page 57: Trademarks

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