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Lenovo Legion Y740 Series Hardware Maintenance Manual
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Lenovo Legion Y740 Series Hardware Maintenance Manual

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Lenovo Legion Y740 Series

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Summary of Contents for Lenovo Legion Y740 Series

  • Page 1 Hardware Maintenance Manual Lenovo Legion Y740 Series...
  • Page 3 Hardware Maintenance Manual Lenovo Legion Y740 Series...
  • Page 4 First Edition (December 2018) © Copyright Lenovo 2018.

  • Page 5: Table Of Contents

    ..Remove the system board... Lenovo Legion Y740 Series CRU list..Disassemble the LCD module ..
  • Page 6 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 2018...

  • 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

    Grounding requirements Electrical grounding of the computer is required for operator safety and correct system function. Proper grounding of the electrical outlet can be verified by a certified electrician. Safety notices (multilingual translations) The safety notices in this section are provided in the following languages: •...
  • Page 11 DANGER DANGER DANGER DANGER DANGER Chapter 1 Safety information...
  • Page 12 Hardware Maintenance Manual...
  • Page 13 PERIGO PERIGO PERIGO Chapter 1 Safety information...
  • Page 14 PERIGO PERIGO PERIGO PERIGO PERIGO Hardware Maintenance Manual...
  • Page 15 DANGER DANGER DANGER DANGER Chapter 1 Safety information...
  • Page 16 DANGER DANGER DANGER DANGER VORSICHT Hardware Maintenance Manual...
  • Page 17 VORSICHT VORSICHT VORSICHT VORSICHT Chapter 1 Safety information...
  • Page 18 VORSICHT VORSICHT VORSICHT Hardware Maintenance Manual...
  • Page 19 Chapter 1 Safety information...
  • Page 20 Hardware Maintenance Manual...
  • Page 21 Chapter 1 Safety information...
  • Page 22 Hardware Maintenance Manual...
  • Page 23 Chapter 1 Safety information...
  • Page 24 Hardware Maintenance Manual...
  • Page 25 Chapter 1 Safety information...
  • Page 26 Hardware Maintenance Manual...

  • Page 27: Chapter 2. General Checkout

    • LCD panel cracked from the application of excessive force or from being dropped • Scratched (cosmetic) parts • Distortion, deformation, or discoloration of the cosmetic parts • Plastic parts, latches, pins, or connectors that have been cracked or broken by excessive force © Copyright Lenovo 2018...

  • Page 28: Checking The Ac Power Adapter

    If the problem persists, call the Customer Support Center. Note: Noise from the ac power adapter does not always indicate a defect. Lenovo Legion Y740 Series CRU list Model: Lenovo Legion Y740-15ICH, Lenovo Legion Y740-15ICHg, Lenovo Legion Y740-17ICH, Lenovo Legion Y740- 17ICHg MT: 81QV, 81HE, 81QW, 81HH...
  • Page 29 ac power adapter self-service power cord self-service Chapter 2 General checkout...
  • Page 30 Hardware Maintenance Manual...

  • Page 31: Chapter 3. Identifying Frus (Crus)

    Chapter 3. Identifying FRUs (CRUs) All FRUs (CRUs) for Lenovo Legion Y740 Series The exploded illustrations help Lenovo service technicians identify FRUs or CRUs that they may need to replace when servicing a customer’s computer. Lenovo Legion Y740–15 Figure 1. Lenovo Legion Y740–15 exploded view...
  • Page 32 Table 1. FRU (CRU) categories – Lenovo Legion Y740–15 FRU (CRU) category Self-service CRU Optional-service CRU LCD module Hinge cover kit Strip cover Upper case (with keyboard) K lock bracket System board I/O board Speakers heat sink and fan assembly...
  • Page 33 Figure 2. Lenovo Legion Y740–15 LCD module exploded view Table 2. FRU categories for the LCD module – Lenovo Legion Y740–15 FRU (CRU) category Self-service CRU Optional-service CRU LCD bezel LCD panel Hinges Camera and microphone board LCD base cover...
  • Page 34 Lenovo Legion Y740–17 Figure 3. Lenovo Legion Y740–17 exploded view Table 3. FRU (CRU) categories – Lenovo Legion Y740–17 FRU (CRU) category Self-service CRU Optional-service CRU LCD module Hinge cover kit Strip cover Upper case (with keyboard) K lock bracket...
  • Page 35 Table 3. FRU (CRU) categories – Lenovo Legion Y740–17 (continued) System board I/O board Speakers Heat sink Memory module Memory module shield Subwoofer Coin-cell battery Wi-Fi card Sponge M.2 solid-state drive M.2 solid-state-drive bracket Storage drive cable Storage drive Storage drive bracket...
  • Page 36 Figure 4. Lenovo Legion Y740–17 LCD module exploded view Table 4. FRU categories for the LCD module – Lenovo Legion Y740–17 FRU (CRU) category Self-service CRU Optional-service CRU LCD bezel LCD panel Hinges Camera and microphone board LCD base cover...

  • Page 37: Miscellaneous Parts

    Miscellaneous parts Table 5. Miscellaneous parts FRU descriptions Self-service CRU Optional-service CRU Screw pack Tape Rubber Thermalpad Chapter 3 Identifying FRUs (CRUs)
  • Page 38 Hardware Maintenance Manual...

  • Page 39: Chapter 4. Removing A Fru Or Cru

    5. To install a new FRU in place, perform the removal procedure in reverse and follow any notes that pertain to replacement. 6. When replacing a FRU, carefully retain and reuse all screws. If screws are missing, look up the Lenovo parts numbers in “” on page for replacement screws and order them through the Lenovo CRM system.

  • Page 40: Remove The Battery Pack

    Figure 5. Remove 11 screws Screw specifications Number of screws M2.0 x 11.5 M2.0 x 3 Step 3. remove the lower case. Figure 6. Remove the lower case Remove the battery pack Make sure the following FRUs (or CRUs) have been removed. “Remove the lower case”...
  • Page 41 Figure 7. Disconnect the cable – Lenovo Legion Y740–15 Figure 8. Disconnect the cable – Lenovo Legion Y740–17 Step 2. Remove screws as shown. Figure 9. Remove screws – Lenovo Legion Y740–15 Screw specifications Number of screws M2.0 x 4...

  • Page 42: Remove The M.2 Solid-State Drive

    M2.0 x 4 Step 3. Take out the battery pack. Figure 11. Take out the battery pack – Lenovo Legion Y740–15 Figure 12. Take out the battery pack – Lenovo Legion Y740–17 Remove the M.2 solid-state drive Make sure the following FRUs (or CRUs) have been removed.
  • Page 43 Screw specifications Number of screws M2.0 x 4 Step 2. Remove the solid-state drive by pulling it away from the slot. Figure 15. Remove by pulling the M.2 solid-state drive – Lenovo Legion Y740–15 Chapter 4 Removing a FRU or CRU...

  • Page 44: Remove The Coin-Cell Battery

    “Remove the lower case” on page 33 “Remove the battery pack” on page 34 “Remove the M.2 solid-state drive” on page 36 Note: For Lenovo Legion Y740–17, you have to remove the solid-state drive before removing the RTC battery. Step 1.

  • Page 45: Remove The Storage Drive (For Selected Models)

    Figure 18. Disconnect the cable – Lenovo Legion Y740–17 Step 2. Remove the coin-cell battery as shown. Figure 19. Remove the coin-cell battery– Lenovo Legion Y740–15 Figure 20. Remove the coin-cell battery– Lenovo Legion Y740–17 Remove the storage drive (for selected models) Make sure the following FRUs (or CRUs) have been removed.
  • Page 46 Figure 21. Disconnect the cable – Lenovo Legion Y740–15 Figure 22. Disconnect the cable – Lenovo Legion Y740–17 Step 2. Remove 4 screws. Figure 23. Remove screws – Lenovo Legion Y740–15 Screw specifications Number of screws M2.0 x 4 Hardware Maintenance Manual...
  • Page 47 M2.0 x 4 Step 3. Remove the storage drive. Figure 25. Remove the storage drive – Lenovo Legion Y740–15 Figure 26. Remove the storage drive – Lenovo Legion Y740–17 Step 4. Remove 4 screws to release the metal frame and then remove the storage drive cable.

  • Page 48: Remove The Memory Module

    Figure 27. Remove the storage drive bracket – Lenovo Legion Y740–15 Screw specifications Number of screws M3.0 x 3 Figure 28. Remove the storage drive bracket – Lenovo Legion Y740–17 Screw specifications Number of screws M3.0 x 3 Remove the memory module Make sure the following FRUs (or CRUs) have been removed.
  • Page 49 Figure 30. Remove memory module shield – Lenovo Legion Y740–17 Step 2. Pull the retaining tags (on both sides of the slot) outwards to release the memory module. Remove the memory module by pulling it away from the slot. Figure 31. Remove the memory module – Lenovo Legion Y740–15...

  • Page 50: Remove The Wi-Fi Card

    Figure 32. Remove the memory module – Lenovo Legion Y740–17 Remove the Wi-Fi card Make sure the following FRUs (or CRUs) have been removed. “Remove the lower case” on page 33 “Remove the battery pack” on page 34 Step 1.
  • Page 51 Figure 34. Remove the sponge – Lenovo Legion Y740–17 Step 2. Disconnect the main and auxiliary antenna cables. Figure 35. Disconnect antenna cables – Lenovo Legion Y740–15 Figure 36. Disconnect antenna cables – Lenovo Legion Y740–17 Step 3. Remove 1 screw.
  • Page 52 Figure 38. Remove 1 screw – Lenovo Legion Y740–17 Number of screws Screw specifications M2.0 x 4 Step 4. Remove the Wi-Fi card by pulling it away from the slot. Figure 39. Remove the Wi-Fi card – Lenovo Legion Y740–15 Hardware Maintenance Manual...

  • Page 53: Remove The Subwoofer (For Lenovo Legion Y740-17)

    Figure 40. Remove the Wi-Fi card – Lenovo Legion Y740–17 Remove the subwoofer (for Lenovo Legion Y740–17) Make sure the following FRUs (CRUs) have been removed. Note: This part is available only on Lenovo Legion Y740–17. “Remove the lower case” on page 33 “Remove the battery pack”...

  • Page 54: Remove The Heat Sink And Fan Assembly

    “Remove the lower case” on page 33 “Remove the battery pack” on page 34 “Remove the Wi-Fi card” on page 44 “Remove the subwoofer (for Lenovo Legion Y740–17)” on page 47 Step 1. Disconnect the cable from the system board.

  • Page 55: Remove The Heat Sink And Fan Assembly

    Figure 46. Remove 6 screws – Lenovo Legion Y740–17 Number of screws Screw specifications M2.0 x 4 Step 3. Remove the heat sink and fan assembly. Figure 47. Remove the heat sink and fan assembly– Lenovo Legion Y740–15 Chapter 4 Removing a FRU or CRU...

  • Page 56: Remove The Speakers

    Figure 48. Remove the heat sink and fan assembly– Lenovo Legion Y740–17 Remove the speakers Make sure the following FRUs (CRUs) have been removed. “Remove the lower case” on page 33 “Remove the battery pack” on page 34 Step 1.

  • Page 57: Remove The I/O Board

    “Remove the battery pack” on page 34 “Remove the Wi-Fi card” on page 44 “Remove the subwoofer (for Lenovo Legion Y740–17)” on page 47 “Remove the heat sink and fan assembly” on page 48 “Remove the speakers” on page 50 Step 1.
  • Page 58 Figure 53. Disconnect the cable – Lenovo Legion Y740–15 Figure 54. Disconnect the cable – Lenovo Legion Y740–17 Step 2. Remove 1 screw. Figure 55. Remove 1 screw – Lenovo Legion Y740–15 Screw specifications Number of screws M2.0 x 4...
  • Page 59 Figure 56. Remove 1 screw – Lenovo Legion Y740–17 Screw specifications Number of screws M2.0 x 4 Step 3. Remove the I/O board. Figure 57. Remove I/O board – Lenovo Legion Y740–15 Figure 58. Remove I/O board – Lenovo Legion Y740–17...

  • Page 60: Remove The System Board

    “Remove the M.2 solid-state drive” on page 36 “Remove the Wi-Fi card” on page 44 “Remove the subwoofer (for Lenovo Legion Y740–17)” on page 47 “Remove the heat sink and fan assembly” on page 48 “Remove the speakers” on page 50 “Remove the I/O board”...
  • Page 61 Step 2. Remove the K lock bracket. Figure 61. Remove the K lock bracket – Lenovo Legion Y740–15 Figure 62. Remove the K lock bracket – Lenovo Legion Y740–17 Step 3. Disconnect the cables from the system board, including the touch pad cable and the display panel cable.

  • Page 62: Disassemble The Lcd Module

    Figure 64. Disconnect the cable – Lenovo Legion Y740–17 Step 4. Remove the system board. Figure 65. Remove the system board – Lenovo Legion Y740–15 Figure 66. Remove the system board – Lenovo Legion Y740–17 Disassemble the LCD module The LCD module as a whole is not a FRU. Instead, it contains FRUs as its components. Before disassembling the LCD module, make sure it has been detached from the base cover.

  • Page 63: Remove The Lcd Module

    “Remove the Wi-Fi card” on page 44 “Remove the speakers” on page 50 “Remove the subwoofer (for Lenovo Legion Y740–17)” on page 47 “Remove the heat sink and fan assembly” on page 48 “Remove the I/O board” on page 51 “Remove the system board”...

  • Page 64: Screw Specifications Number Of Screws

    Step 3. Remove the hinge cover. Figure 69. Remove the hinge cover Step 4. Remove 6 screws. Figure 70. Remove 6 screws Screw specifications Number of screws M2.5 x 5 M2.0 x 2 Step 5. Remove 6 screws. Figure 71. Remove the LCD module Hardware Maintenance Manual...

  • Page 65: Remove The Lcd Bezel

    Repeat this action along the inner edges of the LCD bezel until all hooks that secure the LCD bezel are detached. Figure 72. Pull the inner sides of the LCD bezel – Lenovo Legion Y740–15 Figure 73. Pull the inner sides of the LCD bezel – Lenovo Legion Y740–17...

  • Page 66: Remove The Hinges

    Make sure the following FRUs (or CRUs) have been removed. “Remove the LCD bezel” on page 59 Step 1. Remove 6 screws. Figure 74. Remove 6 screws – Lenovo Legion Y740–15 Screw specifications Number of screws M2.5 x 2.5 Figure 75. Remove 6 screws – Lenovo Legion Y740–17...

  • Page 67: Remove The Lcd Panel

    “Remove the hinges” on page 60 Step 1. For Lenovo Legion Y740–15, pull the two tapes (located on left and right edges under the LCD panel) downwards steadily. With the bottom edge as an axis, lift up the top edge of the LCD panel.
  • Page 68 Step 2. Check the back side of the LCD panel for the LCD connector and then unplug the LCD cable. Figure 80. Disconnect the LCD cable – Lenovo Legion Y740–15 Figure 81. Disconnect the LCD cable– Lenovo Legion Y740–17 Step 3.

  • Page 69: Remove The Camera And Microphone Board

    Figure 82. Remove the LCD panel – Lenovo Legion Y740–15 Figure 83. Remove the LCD panel – Lenovo Legion Y740–17 Remove the camera and microphone board Make sure the following FRUs (or CRUs) have been removed. “Remove the LCD bezel” on page 59 “Remove the hinges”...
  • Page 70 Figure 85. Disconnect the cable – Lenovo Legion Y740–17 Step 2. Remove the camera and microphone board. Figure 86. Remove the camera and microphone board – Lenovo Legion Y740–15 Figure 87. Remove the camera and microphone board – Lenovo Legion Y740–17 Hardware Maintenance Manual...

  • Page 71: Appendix A. Label Locations

    Appendix A. Label locations Figure 88. Label layout on the back side of the base cover– Lenovo Legion Y740–15 Figure 89. Label layout on the back side of the base cover– Lenovo Legion Y740–17 Labels attached to the base cover are country/region specific. Make sure to apply the appropriate labels to the replacement base cover.
  • Page 72 Table 6. All base cover labels Label Label description Label dimensions Applied country/region GML label 16.077 mm x 22.501 mm 15 mm x 10 mm Wlan/BT lable for Malaysia/ Malaysia/Indonesia Indonesia South Africa label South Africa 20 mm x 10 mm Adapter label 65 mm x 20 mm Israel/US/CA/TW label...

  • Page 73: Trademarks

    Trademarks Lenovo, the “lenovo” logo and Legion are trademarks of Lenovo in the United States, other countries or both: Other company, product, or service names may be trademarks or service marks of others.

This manual is also suitable for:

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