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Lenovo 21DK0047IX Hardware Maintenance Manual
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Lenovo 21DK0047IX Hardware Maintenance Manual

Lenovo 21DK0047IX Hardware Maintenance Manual

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Questo manuale d'istruzione è fornito da trovaprezzi.it. Scopri tutte le offerte per
Gen 4 21DK0047IX
Hardware Maintenance Manual
Lenovo ThinkBook 14 Gen 4 and Lenovo ThinkBook 15 Gen 4
o cerca il tuo prodotto tra le
migliori offerte di Notebook
Lenovo ThinkBook 14

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Summary of Contents for Lenovo 21DK0047IX

  • Page 1 Questo manuale d’istruzione è fornito da trovaprezzi.it. Scopri tutte le offerte per Lenovo ThinkBook 14 Gen 4 21DK0047IX o cerca il tuo prodotto tra le migliori offerte di Notebook Hardware Maintenance Manual Lenovo ThinkBook 14 Gen 4 and Lenovo ThinkBook 15 Gen 4...
  • Page 2 First Edition (March 2022) © Copyright Lenovo 2022.

  • Page 3: Table Of Contents

    Trademarks ....lxxxix Remove the memory module ..Remove the CMOS battery ..© Copyright Lenovo 2022...
  • Page 4 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 2022...
  • 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 2022...

  • 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

    • 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 • Damage caused by liquid spilled into the system © Copyright Lenovo 2022...

  • Page 28: Cru List

    • Damage caused by the improper insertion of a personal-computer card (PC card) or the installation of an incompatible card • Improper disc insertion or use of an external optical drive • Fuses blown by attachment of a non-supported device •...

  • Page 29: Chapter 3. Identifying Frus (Crus)

    Chapter 3. Identifying FRUs (CRUs) Locate FRUs and CRUs The exploded illustrations help Lenovo service technicians identify FRUs or CRUs that they may need to replace when servicing a customer’s computer. © Copyright Lenovo 2022...
  • Page 30 Figure 1. ThinkBook 14 G4 IAP and ThinkBook 14 G4 ABA exploded view Hardware Maintenance Manual...
  • Page 31 Table 5. FRU (CRU) categories FRU (CRU) category LCD module Note: The LCD module as a whole is not an FRU, it contains FRUs as its components. Upper case (with keyboard and touchpad) Lens light guide Power board with cable Power sponge Fingerprint board with cable I/O board with cable...
  • Page 32 Figure 2. ThinkBook 14 G4 IAP and ThinkBook 14 G4 ABA LCD unit - exploded view Table 6. FRU categories for the LCD unit FRU (CRU) category LCD bezel Hinge cover LCD panel Microphone rubbers Hardware Maintenance Manual...
  • Page 33 Table 6. FRU categories for the LCD unit (continued) Camera Hinges Removable tape LCD cover EDP cable Chapter 3 Identifying FRUs (CRUs)
  • Page 34 Figure 3. ThinkBook 15 G4 IAP and ThinkBook 15 G4 ABA exploded view Hardware Maintenance Manual...
  • Page 35 Table 7. FRU (CRU) categories FRU (CRU) category LCD module Note: The LCD module as a whole is not an FRU, it contains FRUs as its components. Upper case (with keyboard and touchpad) Lens light guide Fingerprint board with cable Power board with cable Power mylar CMOS battery...
  • Page 36 * for selected models Figure 4. ThinkBook 15 G4 IAP and ThinkBook 15 G4 ABA LCD unit — exploded view Table 8. FRU categories for the LCD unit FRU (CRU) category LCD bezel Hinge cover Hardware Maintenance Manual...
  • Page 37 Table 8. FRU categories for the LCD unit (continued) LCD panel Microphone rubbers Camera Hinges Removable tape LCD cover EDP cable Chapter 3 Identifying FRUs (CRUs)
  • Page 38 Hardware Maintenance Manual...

  • Page 39: 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 40: Removal Procedure For Thinkbook 14 G4 Iap And Thinkbook 14 G4 Aba

    3. Follow the correct sequence in the steps for removing an FRU, as shown in the illustrations by the numbers in square callouts. 4. When removing an FRU, move it in the direction as shown by the arrow in the illustration. 5.

  • Page 41: Remove The Battery Pack

    Pry up the latches and then remove the lower case. Figure 6. 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 42: Remove The 2242 Solid-State Drive (Ssd)

    Figure 8. Remove one screw and separate the 2242 SSD Screw specifications Number of screws M2.0 x L2.0 Go to to look up the Lenovo part numbers of the following https://support.lenovo.com/partslookup replacement parts: 2242 Solid-state drive (SSD) Solid-state drive (SSD) bracket Remove the 2280 solid-state drive (SSD) and thermalpad Make sure the following FRU (or CRU) has been removed.
  • Page 43 Remove the SSD by pulling it away from the slot. Figure 10. Remove the SSD Step 4. Remove the SSD thermalpad. Figure 11. Remove the SSD thermalpad Go to to look up the Lenovo part numbers of the following https://support.lenovo.com/partslookup replacement parts: 2280 Solid-state drive (SSD) Thermalpad Chapter 4...

  • Page 44: Remove The 2 Nd Solid-State Drive (Ssd)

    Step 3. Remove the 2 SSD by pulling it away from the slot. Figure 13. Remove the 2 Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: Solid-state drive (SSD) Remove the 2 solid-state drive (SSD) bracket Make sure the following FRUs (or CRUs) have been removed.

  • Page 45: Remove The Wi-Fi Card

    SSD bracket Screw specifications Number of screws M1.98 x L3.0 Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: SSD bracket Remove the Wi-Fi card Make sure the following FRU (or CRU) has been removed.

  • Page 46: Remove The Heat Sink (For Thinkbook 14 G4 Iap And Thinkbook 15 G4 Iap Only)

    Figure 16. Remove the Wi-Fi card Screw specifications Number of screws M1.98 x L3.0 Go to to look up the Lenovo part numbers of the following https://support.lenovo.com/partslookup replacement parts: Wi-Fi card Mylar Remove the heat sink (for ThinkBook 14 G4 IAP and ThinkBook 15 G4 IAP only) Make sure the following FRU (or CRU) has been removed.

  • Page 47: Remove The Fan (For Thinkbook 14 G4 Iap And Thinkbook 15 G4 Iap Only)

    Figure 17. Remove the heat sink Screw specifications Number of screws M2.0 x L2.0 Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: Heat sink Remove the fan (for ThinkBook 14 G4 IAP and ThinkBook 15 G4 IAP only) Make sure the following FRU (or CRU) has been removed.

  • Page 48: Remove The Thermal Module (For Thinkbook 14 G4 Aba And Thinkbook 15 G4 Aba Only)

    Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: Remove the thermal module (for ThinkBook 14 G4 ABA and ThinkBook 15 G4 ABA only) Make sure the following FRU (or CRU) has been removed.

  • Page 49: Remove The Memory Module

    Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: Thermal module Remove the memory module Make sure the following FRU (or CRU) has been removed. “Remove the lower case” on page 34 Step 1.

  • Page 50: Remove The Cmos Battery

    Disconnect the CMOS battery cable from the I/O board and then remove the CMOS battery. Figure 23. Disconnect the CMOS battery cable and remove the CMOS battery Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part:...

  • Page 51: Remove The I/O Bracket (Right)

    Figure 24. Remove the I/O bracket (left) Screw specifications Number of screws M2.0 x L4.0 Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: I/O bracket (left) Remove the I/O bracket (right) Make sure the following FRU (or CRU) has been removed.

  • Page 52: Remove The I/O Board With Cable

    I/O bracket (right) Remove the I/O board with cable Make sure the following FRUs (or CRUs) have been removed. “Remove the lower case” on page 34 “Remove the battery pack” on page 35 “Remove the fan” on page 41 “Remove the CMOS battery” on page 44 “Remove the I/O bracket (right)”...

  • Page 53: Remove The Power Board With Cable

    Figure 28. Remove the I/O board with cable Screw specifications Number of screws M2.0 x L4.0 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 power board with cable Make sure the following FRUs (or CRUs) have been removed.
  • Page 54 “Remove the I/O bracket (right)” on page 45 “Remove the I/O board with cable” on page 46 Step 1. Disconnect the power board cable from the power board. Figure 29. Disconnect the power board cable from the power board Step 2. Peel off the tape carefully.

  • Page 55: Remove The Fingerprint Board With Cable

    Figure 31. Remove the power board Screw specifications Number of screws M1.6 x L2.7 Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: Power board with cable Remove the fingerprint board with cable Make sure the following FRUs (or CRUs) have been removed.

  • Page 56: Remove The Lens Light Guide

    Figure 32. Remove the fingerprint board with cable Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: Fingerprint board with cable Remove the lens light guide Make sure the following FRUs (or CRUs) have been removed.

  • Page 57: Remove The Speakers

    Disconnect the speaker cable from the system board and release the speaker cable from the cable guide. Then, remove the speakers. Figure 34. 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 system board Make sure the following FRUs (or CRUs) have been removed.
  • Page 58 Number of screws M1.98 x L3.0 Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part: System board Use a Golden Key U1 tool to flash-write key id information After replacing the system board and re-assembling the computer, use a pre-made Golden Key U1 tool to start the computer and flash-write the serial number (SN), machine type (MT), product name (PN), and UUID to the new system board.

  • Page 59: Remove The Lcd Module

    Remove the LCD module Make sure the following FRUs (CRUs) have been removed. “Remove the lower case” on page 34 “Remove the heat sink” on page 40 “Remove the fan” on page 41 Step 1. Peel off the mylar carefully. Note: The mylar is not reusable.

  • Page 60: Remove The Upper Case (With Keyboard And Touchpad)

    Figure 39. Rotate the LCD module and remove the LCD module Screw specifications Number of screws M2.5 x L5.5 Remove the upper case (with keyboard and touchpad) Make sure the following FRUs (CRUs) have been removed. “Remove the lower case” on page 34 “Remove the battery pack”...

  • Page 61: Disassemble The Lcd Module

    Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: Upper case (with keyboard and touchpad) Disassemble the LCD module The LCD module as a whole is not an FRU. Instead, it contains FRUs as its components. Before disassembling the LCD module, make sure it has been detached from the upper case.
  • Page 62 Note: The LCD bezel is fragile and should be replaced if damaged. Figure 42. Remove the LCD bezel Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part: LCD bezel Remove the hinges Make sure the following FRUs (CRUs) have been removed.
  • Page 63 Number of screws M2.0 x L2.0 M2.0 x L4.0 Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part: Hinges Remove the LCD panel Make sure the following FRUs (CRUs) have been removed. “Remove the LCD module” on page 53 “Remove the hinge cover”...
  • Page 64 Figure 45. Disconnect the EDP cable and remove the LCD panel Go to to look up the Lenovo part numbers of the following https://support.lenovo.com/partslookup replacement parts: LCD panel Removable tape LCD Self Test When you turn on the computer and the LCD goes black, run LCD Self Test to help you determine whether the LCD functions normally.
  • Page 65 Figure 46. Remove the EDP cable Go to to look up the Lenovo part numbers of the following https://support.lenovo.com/partslookup replacement parts: EDP cable Removable tape Remove the microphone rubbers Make sure the following FRUs (CRUs) have been removed. “Remove the LCD module” on page 53 “Remove the hinge cover”...
  • Page 66 “Remove the microphone rubbers” on page 59 Step 1. Disconnect the EDP cable from the camera board and then remove the camera. Figure 48. Remove the camera Go to to look up the Lenovo part numbers of the following https://support.lenovo.com/partslookup replacement parts: Camera Removable tape Remove the LCD cover Make sure the following FRUs (CRUs) have been removed.
  • Page 67 Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: LCD cover Chapter 4 Removing a FRU or CRU...

  • Page 68: Removal Procedure For Thinkbook 15 G4 Iap And Thinkbook 15 G4 Aba

    Step 3. Pry up the latches and then remove the lower case. Figure 50. Pry up the latches and remove the lower case Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: Lower case...

  • Page 69: Remove The Battery Pack

    Screw specifications Number of screws M2.0 x L4.0 Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part: Battery pack Remove the 2242 solid-state drive (SSD) Make sure the following FRU (or CRU) has been removed.

  • Page 70: Remove The Solid-State Drive (Ssd)

    Figure 52. Remove one screw and separate the 2242 SSD Number of screws Screw specifications M2.0 x L2.0 Go to to look up the Lenovo part numbers of the following https://support.lenovo.com/partslookup replacement parts: 2242 Solid-state drive (SSD) Solid-state drive (SSD) bracket Remove the solid-state drive (SSD) Make sure the following FRU (or CRU) has been removed.

  • Page 71: Remove The 2 Nd Solid-State Drive (Ssd)

    Figure 54. Remove the SSD thermalpad Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: Solid-state drive (SSD) Thermalpad Remove the 2 solid-state drive (SSD) Make sure the following FRU (or CRU) has been removed.

  • Page 72: Remove The 2 Nd Solid-State Drive (Ssd) Bracket

    Figure 56. Remove the 2 Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: Solid-state drive (SSD) Remove the 2 solid-state drive (SSD) bracket Make sure the following FRUs (or CRUs) have been removed.
  • Page 73 “Remove the lower case” on page 62 Step 1. Disconnect the battery pack cable from the system board. Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable. Step 2. Peel off the tape. Figure 58.

  • Page 74: Remove The Memory Module

    Screw specifications Number of screws M2.0 x L3.0 Go to https://support.lenovo.com/partslookup to look up the Lenovo part numbers of the following replacement parts: Wi-Fi card Wi-Fi card Mylar Remove the memory module Make sure the following FRU (or CRU) has been removed.

  • Page 75: Remove The Cmos Battery

    Figure 62. Remove the memory module Go to to look up the Lenovo part numbers of the following https://support.lenovo.com/partslookup replacement parts: Memory module Memory module shielding Remove the CMOS battery Make sure the following FRU (or CRU) has been removed.

  • Page 76: Remove The I/O Bracket (Left)

    Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: CMOS battery Remove the I/O bracket (left) Make sure the following FRU (or CRU) has been removed. “Remove the lower case” on page 62 Step 1.

  • Page 77: Remove The I/O Board With Cable

    Figure 65. Remove the I/O bracket (right) Screw specifications Number of screws M2.0 x L4.0 Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: I/O bracket (right) Remove the I/O board with cable Make sure the following FRUs (or CRUs) have been removed.
  • Page 78 Remove one screw and then remove the I/O board with cable. Figure 68. Remove the I/O board with cable Screw specifications Number of screws M2.0 x L4.0 Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part: I/O board with cable Hardware Maintenance Manual...

  • Page 79: Remove The Power Board With Cable

    Remove the power board with cable Make sure the following FRUs (or CRUs) have been removed. “Remove the lower case” on page 62 “Remove the battery pack” on page 63 “Remove the CMOS battery” on page 69 “Remove the I/O bracket (right)” on page 70 “Remove the I/O board with cable”...

  • Page 80: Remove The Fingerprint Board With Cable

    Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: Power board with cable Remove the fingerprint board with cable Make sure the following FRUs (or CRUs) have been removed. “Remove the lower case” on page 62 “Remove the battery pack”...

  • Page 81: Remove The Speakers

    Figure 72. Remove the fingerprint board lens light guide Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: Lens light guide Remove the speakers Make sure the following FRU (CRU) has been removed. “Remove the lower case” on page 62 Step 1.
  • Page 82 Number of screws M2.0 x L3.0 Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part: System board Use a Golden Key U1 tool to flash-write key id information After replacing the system board and re-assembling the computer, use a pre-made Golden Key U1 tool to start the computer and flash-write the serial number (SN), machine type (MT), product name (PN), and UUID to the new system board.

  • Page 83: Remove The Lcd Module

    The Golden Key U1 tool is prepared by running the U1 Update software on a FAT32-formatted USB thumb drive. Go to http://support.lenovo.com/us/en/solutions/HT506954 for detailed instructions on how to create and use a Golden Key U1 tool. Remove the LCD module Make sure the following FRUs (CRUs) have been removed.

  • Page 84: Remove The Upper Case (With Keyboard And Touchpad)

    “Remove the speakers” on page 75 “Remove the system board” on page 75 “Remove the LCD module” on page 77 Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: Upper case (with keyboard and touchpad) Disassemble the LCD module The LCD module as a whole is not an FRU.

  • Page 85: Remove The Lcd Bezel

    Figure 78. Remove the hinge cover Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part: Hinge cover Remove the LCD bezel Make sure the following FRUs (CRUs) have been removed. “Remove the LCD module” on page 77 “Remove the hinge cover”...
  • Page 86 Figure 80. Remove the LCD bezel Go to to look up the Lenovo part number of the following replacement https://support.lenovo.com/partslookup part: LCD bezel Remove the hinges Make sure the following FRUs (CRUs) have been removed. “Remove the LCD module” on page 77 “Remove the hinge cover”...

  • Page 87: Remove The Lcd Panel

    Lift the LCD panel slightly. Peel off the tape. Disconnect the EDP cable from the LCD panel and then remove the LCD panel. Figure 83. Disconnect the EDP cable and remove the LCD panel Go to https://support.lenovo.com/partslookup to look up the Lenovo part numbers of the following replacement parts: LCD panel Removable tape Chapter 4...

  • Page 88: Remove The Lcd Panel

    Step 1. Disconnect the EDP cable from the camera board and then remove the EDP cable. Figure 84. Remove the EDP cable Go to to look up the Lenovo part numbers of the following https://support.lenovo.com/partslookup replacement parts: EDP cable Removable tape Remove the microphone rubbers Make sure the following FRUs (CRUs) have been removed.

  • Page 89: Remove The Camera

    Remove the microphone rubbers. Note: The microphone rubbers are not reusable. Replace them when replacing related FRUs. Figure 85. Remove the microphone rubbers Go to to look up the Lenovo part numbers of the following https://support.lenovo.com/partslookup replacement parts: Microphone rubbers...
  • Page 90 “Remove the EDP cable” on page 82 “Remove the microphone rubbers” on page 82 “Remove the camera” on page 83 Go to https://support.lenovo.com/partslookup to look up the Lenovo part number of the following replacement part: LCD cover Hardware Maintenance Manual...

  • Page 91: Appendix A. Label Locations

    70 mm x 10 mm Adapter label 65 mm x 20 mm Country label Indonesia rating label 26 mm x 10 mm 22 mm x 30 mm India BIS label KR KCC label 50 mm x 43 mm © Copyright Lenovo 2022...
  • Page 92 Table 10. All base cover labels (continued) WL/BT label Brazil 35 mm x 15 mm 32 mm x 10 mm Israel/US/CA/TW 20 mm x 10 mm South Africa Malaysia/Indonesia 15 mm x 10 mm Country label Japan 35 mm x 10 mm Belarus Label 40 mm x 8 mm Vietnam energy label...
  • Page 93 Table 11. All base cover labels (continued) VGA label 19.53 mm x 18 mm Country label Argentina 68 mm x 6 mm TW label 70 mm x 10 mm Adapter label 65 mm x 20 mm Country label Indonesia rating label 26 mm x 10 mm KR KCC label 50 mm x 43 mm...
  • Page 94 Hardware Maintenance Manual...

  • Page 95: Trademarks

    Trademarks LENOVO and the LENOVO logo are trademarks of Lenovo. All other trademarks are the property of their respective owners. © 2022 Lenovo.

This manual is also suitable for:

Thinkbook 15 gen 4Thinkbook 14 gen 4

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