Lenovo N21 Chromebook Hardware Maintenance Manual
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Lenovo N21 Chromebook Hardware Maintenance Manual

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Hardware Maintenance Manual
Lenovo N21 Chromebook

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Summary of Contents for Lenovo N21 Chromebook

  • Page 1 Hardware Maintenance Manual Lenovo N21 Chromebook...
  • Page 3 Hardware Maintenance Manual Lenovo N21 Chromebook...
  • Page 4 First Edition (March 2015) © Copyright Lenovo 2015.

  • Page 5: Table Of Contents

    Appendix B. Specifications ..47 Chapter 3. Idetifying FRUs (CRUs) . . 21 All FRUs (CRUs) for Lenovo N21 Chromebook . . Appendix C. Lenovo part numbers of Lenovo part numbers of replacement FRUs or screws used on N21 Chromebook .
  • 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 2015...

  • 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 2015...

  • Page 26: Checking The Ac Power Adapter

    • 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 27: Chapter 3. 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 “Lenovo part numbers of replacement FRUs or CRUs” on page 25 if you need to look up Lenovo part numbers for a particular FRU or CRU.
  • Page 28 Figure 1. N21 exploded view Table 1. FRU (CRU) categories FRU (CRU) category CRU ID LCD module Foot rubber pack Upper case Battery pack Thermal module System board Hardware Maintenance Manual...
  • Page 29 Table 1. FRU (CRU) categories (continued) Speakers WLAN & Bluetooth combo module I/O board DC-in cable Lower case ac power adapter Power cord Note: A customer replaceable unit (CRU) is identified by a single asterisk (*) or two asterisks (**) in the CRU ID column.
  • Page 30 Figure 2. LCD module — exploded view Table 2. FRU categories for the LCD module FRU (CRU) category CRU ID LCD bezel LCD panel Hinges EDP cable and LCD cable Camera board Camera cover Hardware Maintenance Manual...

  • Page 31: Lenovo Part Numbers Of Replacement Frus Or Crus

    Lower Case Q N21 W/Root Rubber 5CB0H70354 Note: Refer to Appendix D “Lenovo part numbers of ac adapters and power cords” on page 51 to look up the Lenovo part numbers of ac power adapters and power cords. Chapter 3...
  • Page 32 Table 4. Part numbers for LCD FRUs No. FRU (CRU) category Lenovo part number Spare parts description LCD bezel 5B30H70349 LCD Bezel Q N21 W/Screw Pad LCD panel 5D10H11015 AUO B116XTN02.3 2B HD AG S NB CMI N116BGE EA2 HD AG S LED1 NB LCD...

  • Page 33: 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 Appendix C “Lenovo part numbers of screws used on N21 Chromebook” on page 49 for replacement screws and order them through the Lenovo CRM system.
  • Page 34 Figure 3. Pry rubbers out of recesses Note: Each recess is marked with a number, please make sure that all rubbers are put in the right recesses when installing. Step 2. Remove the ten screws Figure 4. Remove 10 screws Step 3.
  • Page 35 Figure 5. Lift the upper case Step 5. Unplug the battery cable Figure 6. Unplug the battery cable Note: The Chromebook will be powered on automatically when LCD cover is open. Therefore, please make sure that the battery cable is unplugged before doing the following operations. Step 6.
  • Page 36 1.85 +/- 0.15kgf-cm Black M2 × 3mm, flat-head, nylon-coated 1.85 +/- 0.15kgf-cm Refer to Table 3 “Part numbers for FRUs (CRUs)” on page 25 to look up the Lenovo part numbers of the following replacement parts: Upper case Foot rubber pack...

  • Page 37: Remove The Speakers

    Remove the speakers Make sure the following FRUs (CRUs) have been removed: “” on page “Remove the battery pack” on page Step 1. Unplug the speakers’ cable from the system board Figure 9. Remove the speakers Step 2. Remove the four screws and then remove the speaker modules Figure 10.

  • Page 38: Remove The I/O Board

    Refer to Table 3 “Part numbers for FRUs (CRUs)” on page 25 to look up the Lenovo part numbers of replacement speakers. Remove the I/O board Make sure the following FRUs (CRUs) have been removed: “” on page “Remove the battery pack” on page “Remove the speakers”...

  • Page 39: Remove The Wlan & Bluetooth Combo Module

    Refer to Table 3 “Part numbers for FRUs (CRUs)” on page 25 to look up the Lenovo part numbers of replacement I/O board. Remove the WLAN & Bluetooth combo module Make sure the following FRUs (CRUs) have been removed: “” on page Step 1.

  • Page 40: Remove The Lcd Module

    Black M2 × 3mm, flat-head, nylon-coated 1.85 +/- 0.15kgf-cm Refer to Table 3 “Part numbers for FRUs (CRUs)” on page 25 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: “”...

  • Page 41: Remove The Thermal Module, The System Board And The Dc-In Cable

    Figure 17. Remove 4 screws Step 3. Lift up the LCD module to detach it from the base cover Figure 18. Lift up the LCD module Table 8. Screw specifications — removing the LCD module Screw Specifications Color Torque label M2.5 ×54 mm, flat-head, nylon-coated Black 3.7 –...
  • Page 42 “Remove the I/O board” on page 32 “Remove the WLAN & Bluetooth combo module” on page 33 “Remove the LCD module” on page 34 Step 1. Unplug the DC-in cable Figure 19. Unplug the DC-in cable Step 2. Loosen the two screws and then remove the thermal module.

  • Page 43: Disassemble The Lcd Module

    M2 ×3 mm, flat-head, nylon-coated Black 1.85 +/- 0.15kgf-cm Refer to Table 3 “Part numbers for FRUs (CRUs)” on page 25 to look up the Lenovo part numbers of the following replacement parts: System board thermal module Base cover Disassemble the LCD module The LCD module as a whole is not a FRU.
  • Page 44 Figure 23. Pry the six rubber pads Step 2. Remove the six screws Figure 24. Remove 6 screws Step 3. Insert the screwdriver between one inner side of the LCD bezel and the LCD panel and then carefully pull the LCD bezel outwards. Repeat this action along the inner edges of the LCD bezel until all hooks that secure the LCD bezel are detached.

  • Page 45: Remove The Lcd Panel

    M2.5 × 3.5 mm, flat-head, nylon-coated Black 3.7 — 4.0 kgf * cm Refer to Table 4 “Part numbers for LCD FRUs” on page 26 to look up the Lenovo part numbers of the following replacement parts: Foot Rubber Pack...

  • Page 46: Remove The Camera Board, The Camera Cover And The Edp Cable

    M2 × 2.5 mm, flat-head, nylon-coated Silvery 1.7 — 2.0 kgf * cm Refer to Table 4 “Part numbers for LCD FRUs” on page 26 to look up the Lenovo part numbers of the following replacement parts: LCD panel Remove the camera board, the camera cover and the EDP cable “Remove the LCD bezel”...
  • Page 47 Figure 29. Tear off the mylar Step 3. Remove the two screws and then remove the camera cover. Figure 30. Remove the camera cover Step 4. Detach the LCD cable and EDP cable in the direction shown by arrow Figure 31. Remove the LCD cable and EDP cable Step 5.

  • Page 48: Remove The Hinges And The Wlan Antennas

    The camera cover is composed of several parts. For more details, please refer to “All FRUs (CRUs) for Lenovo N21 Chromebook” on page 21 Refer to Table 4 “Part numbers for LCD FRUs” on page 26 to look up the Lenovo part numbers of the following replacement parts:...
  • Page 49 M2.5 × 3.5 mm, flat-head, nylon-coated Silver 3.7 — 4.0 kgf * cm Refer to Table 4 “Part numbers for LCD FRUs” on page 26 to look up the Lenovo part numbers of the following replacement parts: Hinges (left and right)
  • Page 50 Hardware Maintenance Manual...

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

    Appendix A. Features, controls, and connectors Figure 35. N21 Chromebook features and connectors Table 13. N21 Chromebook features and connectors Feature or connector Swivel camera Microphone hole Handle bar Shortcut keys Touch pad AC power adapter DC-in indicator HDMI connector USB 3.0 connector...
  • Page 52 Hardware Maintenance Manual...

  • Page 53: Appendix B. Specifications

    Appendix B. Specifications Lenovo N21 Chromebook 80MG Dimensions 300.4 mm x 212 mm x 22.4 mm Weights 1.29 Kg Intel Baytrail-M 1280 x 720 pixels Swivel camera 11.6 inch Size Resolutions 1366 x 768 pixels Backlight type Memory DDR3L Type/speed...
  • Page 54 Hardware Maintenance Manual...

  • Page 55: Appendix C. Lenovo Part Numbers Of Screws Used On N21 Chromebook

    Appendix C. Lenovo part numbers of screws used on N21 Chromebook Table 14. Part numbers of N21 screws Screw description Part number Screw Pack Q N21 5S10H70356 © Copyright Lenovo 2015...
  • Page 56 Hardware Maintenance Manual...

  • Page 57: Appendix D. Lenovo Part Numbers Of Ac Adapters And Power Cords

    Appendix D. Lenovo part numbers of ac adapters and power cords Table 15. Part numbers for FRUs (CRUs) Parts description Lenovo part number CRU category ac power adapter Adapter Q N21 5A10H70353 Power cord LINETEK LP-61L+ H03VV-F+ LS15 145-000593 Longwell LP-61L+H03VV-F+LS-18...
  • Page 58 Table 15. Part numbers for FRUs (CRUs) (continued) lux 0019+VCTF 0.75/3C+0021 145-500007 LINETEK LS15+H05VV-F+LP-E04A 145-000590 Longwell LP-486+KTLH03VV-F+LS-5 145-000558 VOLEX M2511+KETI IEC+VAC5S 145-000533 lux 0033+H03VV-F 0.75/3C+0011 145-500008 145-000591 LINETEK LS15+H03VV-F+PE-336 Longwell LP-22+H03VV-F+LS-18 145-000559 145-000535 VOLEX IT10S3+HO3VV-F+VAC5S lux 0029+H03VV-F 0.75/3C+0011 145-500009 145-000586 LINETEK LS15+H03VV-F+PE-364 Longwell LP-39+H03VV-F+LS-18 145-000554...

  • Page 59: Appendix E. Label Locations

    Figure 36. Label layout on the back side of the base cover Table 16. All base cover labels Label Label description Rating label Rating label (print) SN label Indonesia label (rating label) Brazil label Korean label Wlan label SIRIM label Israel label Indonesia label (model label) © Copyright Lenovo 2015...
  • Page 60 Hardware Maintenance Manual...

  • Page 61: 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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