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Lenovo N23 Chromebook Hardware Maintenance Manual
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Lenovo N23 Chromebook Hardware Maintenance Manual

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Hardware Maintenance Manual
Lenovo N23 Chromebook

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  • Page 1 Hardware Maintenance Manual Lenovo N23 Chromebook...
  • Page 3 Hardware Maintenance Manual Lenovo N23 Chromebook...
  • Page 4 First Edition (January 2017) © Copyright Lenovo 2017.

  • Page 5: Table Of Contents

    ... . . N23 Chromebook — CRU list ..Assemble camera parts ..
  • 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 2017...

  • 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. If any unsafe conditions are present, you must determine how serious the apparent hazard could be and whether you can continue without first correcting the problem.

  • 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 Chapter 1 Safety information...
  • Page 12 Hardware Maintenance Manual...
  • Page 13 PERIGO PERIGO PERIGO PERIGO Chapter 1 Safety information...
  • Page 14 PERIGO PERIGO PERIGO PERIGO DANGER DANGER Hardware Maintenance Manual...
  • Page 15 DANGER DANGER DANGER DANGER DANGER Chapter 1 Safety information...
  • Page 16 DANGER VORSICHT VORSICHT VORSICHT VORSICHT Hardware Maintenance Manual...
  • Page 17 VORSICHT VORSICHT VORSICHT VORSICHT Chapter 1 Safety information...
  • Page 18 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 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 2017...

  • Page 26: Checking The Ac Power Adapter

    Replace the system board. b. If the problem persists, call the Customer Support Center. Note: Noise from the ac power adapter does not always indicate a defect. N23 Chromebook — CRU list Model: Lenovo N23 Chromebook MT: 80YS Type...
  • Page 27 ac power adapter self-service power cord self-service Chapter 2 General checkout...
  • Page 28 Hardware Maintenance Manual...

  • Page 29: Chapter 3. Create And Use A Usb Repair Shim

    Before replacing any FRUs, use the repair shim to diagnose and identify problems. Note: You do not need to use the repair shim to diagnose problems before replacing CRUs. For the list of CRUs for your computer, refer to “N23 Chromebook — CRU list” on page 20. Create a repair shim Step 1.

  • Page 30: Factory Test Items

    Note: The VPD is a 20 — character string. Table 1. Combination of the 20 – character VPD Preceding Machine type Model number characters “1S”, 2 digits 7 digits 3 digits 8 digits The MTM and SN can be found on the label attaching to the bottom cover. Step 6.
  • Page 31 Common issues leading to GoogleRequiredTests fail Issue Description HWID mismatch Each Chromebook has a known hardware configuration. Each configuration is assigned an HWID. HWID mismatch can be caused by using unauthorized parts, or missing parts. If the write-protect function is not turned off before recovering the computer with the repair shim, it will also cause HWID mismatch.
  • Page 32 Hardware Maintenance Manual...

  • Page 33: Chapter 4. Idetifying Frus (Crus)

    The exploded illustrations help Lenovo service technicians identify FRUs or CRUs that they may need to replace when servicing a customer’s computer. Refer to Appendix B “Lenovo part numbers for replacement FRUs” on page 47 if you need to look up Lenovo part numbers for a particular FRU or CRU.
  • Page 34 Figure 1. N23 exploded view Table 3. FRU (CRU) categories FRU (CRU) category LCD module Upper case (with keyboard) Battery pack System board Speakers WLAN & Bluetooth combo module Hardware Maintenance Manual...
  • Page 35 Table 3. FRU (CRU) categories (continued) USB board DC-in cable Base cover Foot rubber pack Figure 2. LCD module — exploded view Table 4. FRU categories for the LCD module FRU (CRU) category LCD bezel Panel bracket Chapter 4 Idetifying FRUs (CRUs)
  • Page 36 Table 4. FRU categories for the LCD module (continued) LCD panel Hinges LCD & camera cable Camera assembly LCD base cover Hardware Maintenance Manual...

  • Page 37: Chapter 5. 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 Appendix C “Lenovo part numbers for CRUs and miscellaneous parts” on page 51 for replacement screws and order them through the Lenovo CRM system.

  • Page 38: Remove The Upper Case (With Keyboard)

    When prompted to log on to the local host, type chronos and press enter. Step 5. Type sudo bash and press enter. Step 6. Type ectool batterycutoff and press enter. Step 7. When the message SUCCESS. The battery has arranged a cut-off and the system should be shutdown Step 8.

  • Page 39: Remove The Battery Pack

    Open the keyboard and touch pad sockets, detach the cables, and pull up the upper case. Refer to Table 15 “Part numbers for FRUs (CRUs)” on page 47 to look up the Lenovo part numbers for the following replacement parts: Upper case The ROM write-protection screw can be removed after removing the upper case.

  • Page 40: Remove The Speakers

    Battery pack M2 × 3 mm, flat-head, nylon-coated Silver to base cover Refer to Table 15 “Part numbers for FRUs (CRUs)” on page 47 to look up the Lenovo part numbers of the following replacement parts: Battery pack Remove the speakers Make sure the following FRUs (CRUs) have been removed.

  • Page 41: Remove The Usb Board

    Figure 7. Unplug the speakers’ cable off the system board Step 2. Carefully remove the speakers off the piles. Refer to Table 15 “Part numbers for FRUs (CRUs)” on page 47 to look up the Lenovo part numbers of replacement speakers. Remove the USB board Make sure the following FRUs (CRUs) have been removed: “Remove the upper case (with keyboard)”...

  • Page 42: Remove The Wlan & Bluetooth Combo Module

    M2 × 3 mm, flat-head, nylon-coated Silver base cover Refer to Table 15 “Part numbers for FRUs (CRUs)” on page 47 to look up the Lenovo part numbers of replacement USB board. Remove the WLAN & Bluetooth combo module Make sure the following FRUs (CRUs) have been removed and the battery connector has been detached.

  • Page 43: Remove The Lcd Module

    Figure 11. Pull out the WLAN & Bluetooth combo module Refer to Table 15 “Part numbers for FRUs (CRUs)” on page 47 to look up the Lenovo part numbers of replacement WLAN & Bluetooth combo modules. Remove the LCD module Make sure the following FRUs (CRUs) have been removed and the battery connector has been detached.
  • Page 44 Figure 12. Unplug the DC-in cable Step 2. Remove the screws and take out the system board. Table 10. Screw specifications — removing the LCD module Screw Screw Specifications Color location used for system M2 ×3 mm, flat-head, nylon-coated Silver board to base cover...

  • Page 45: Disassemble The Lcd Module

    Figure 14. Remove the DC-in cable Refer to Table 15 “Part numbers for FRUs (CRUs)” on page 47 to look up the Lenovo part numbers of the following replacement parts: System board DC-in cable Base cover Disassemble the LCD module The LCD module as a whole is not a FRU.

  • Page 46: Remove The Lcd Panel

    Detach with care. Step 4. Remove the LCD bezel. Refer to Table 16 “Part numbers for LCD FRUs” on page 48 to look up the Lenovo part numbers for the replacement LCD bezel. Remove the LCD panel Make sure the following FRUs (or CRUs) have been removed.

  • Page 47: Remove The Camera Assembly Or The Lcd & Camera Cable

    Figure 18. Disconnect the LCD cable from the back of the LCD panel Step 3. Remove the LCD panel. Refer to Table 16 “Part numbers for LCD FRUs” on page 48 to look up the Lenovo part numbers for replacement LCD panels. Remove the camera assembly or the LCD & camera cable Make sure the following FRUs (or CRUs) have been removed.
  • Page 48 Figure 19. Tear off mylar Step 2. Remove the two screws. Figure 20. Remove two screws Step 3. Unplug the LCD & Camera cable from the camera board. Figure 21. Unplug LCD & camera cable Step 4. Remove the LCD & camera cable or the camera assembly. If you need to replace the LCD &...

  • Page 49: Assemble Camera Parts

    Figure 22. Remove the camera module Refer to Table 16 “Part numbers for LCD FRUs” on page 48 to look up the Lenovo part numbers for replacement parts for: Camera assembly LCD & camera cable Assemble camera parts The replacement camera assembly came in several parts. You need to connect the LCD cable to the connector on the camera board and assemble the various parts before install it on the LCD module.

  • Page 50: Remove The Hinges

    M2.5 × 3.5 mm, flat-head, nylon-coated Silver to LCD base cover Step 2. Remove the hinges. Refer to Appendix B “Lenovo part numbers for replacement FRUs” on page 47 to look up the Lenovo part numbers for the replacement hinges. Hardware Maintenance Manual...

  • Page 51: Appendix A. Features, Controls, And Connectors

    Feature or connector Swivel camera Microphone hole Handle bar Shortcut keys Touch pad DC-in jack DC-in indicator HDMI connector USB 3.0 connector Memory card (SD/MMC) slot Combo audio jack Speakers Kensington lock slot USB 2.0 connector Power button © Copyright Lenovo 2017...
  • Page 52 Hardware Maintenance Manual...

  • Page 53: Appendix B. Lenovo Part Numbers For Replacement Frus

    Appendix B. Lenovo part numbers for replacement FRUs When servicing a customer’s computer, Lenovo service technicians may use part numbers listed in the following tables to order replacement parts through Lenovo CRM (customer relationship management) system. Table 15. Part numbers for FRUs (CRUs) No.
  • Page 54 Foot Q 80YS UP+DOWN 5F40N00713 Note: Refer to Appendix C “Lenovo part numbers for CRUs and miscellaneous parts” on page 51 to look up the Lenovo part numbers of ac power adapters and power cords. Table 16. Part numbers for LCD FRUs No.
  • Page 55 EDP cable and LCD cable LCD Cable Q 80YS 5C10N00701 LCD Cable Q 80YS TOUCH 5C10N00695 Camera assembly Camera Q 80us 2 MIC 5C20L85359 LCD base cover LCD Cover Q 80YS BLK W/Antenna 5CB0N00707 Appendix B. Lenovo part numbers for replacement FRUs...
  • Page 56 Hardware Maintenance Manual...

  • Page 57: Appendix C. Lenovo Part Numbers For Crus And Miscellaneous Parts

    Appendix C. Lenovo part numbers for CRUs and miscellaneous parts The power cords and ac adapters are CRUs. Table 17. Part numbers for FRUs (CRUs) CRU category Parts description Lenovo part number Screw pack Screw Pack Q 80YS SCREW KIT...
  • Page 58 Table 17. Part numbers for FRUs (CRUs) (continued) 145000563 Longwell LP-41+H03VV-F+LS-18 1米电源线 145000562 Longwell LP-30B+SPT-2 18AWG+LS-18 1米电源线 145000561 Longwell LP-61L+H03VV-F+LS-18 1米电源线 145000560 Longwell LP-67+BIS+LS-18 1米电源线 145000559 Longwell LP-22+H03VV-F+LS-18 1米电源线 145000558 Longwell LP-486+KTLH03VV-F+LS-5 1米电源线 145000557 Longwell LP-23A+LFC-3R+LS-18 1米电源线 145000556 Longwell LP-71+VCTF+LS-33 1米电源线 145000555 Longwell LP-54+VCTF+LS-18 1米电源线...
  • Page 59 Table 17. Part numbers for FRUs (CRUs) (continued) 145500006 lux 0038+H03VV-F 0.75/3C+0011 1米电源线 145500007 lux 0019+VCTF 0.75/3C+0021 1米电源线 145500005 lux 0018(E)+VCTF 0.75/3C+0021 1米电源线 145500010 lux 0044+H03VV-F 0.75/3C+0011 1米电源线 145500001 lux 0033+H03VV-F 0.75/3C+0011 1米电源线 Appendix C. Lenovo part numbers for CRUs and miscellaneous parts...
  • Page 60 Hardware Maintenance Manual...

  • Page 61: Appendix D. Label Locations

    Malaysia 15 mm x 10 mm Malaysia SIRIM label Korea KCC label Korea 35 mm x 12 mm Indonesia WLAN label Indonesia 32 mm x 10 mm Indonesia rating label Indonesia 32 mm x 10 mm © Copyright Lenovo 2017...
  • Page 62 Hardware Maintenance Manual...

  • Page 63: Trademarks

    Trademarks Lenovo and the “lenovo” logo 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.

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