Lenovo N20 Chromebook Hardware Maintenance Manual
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Lenovo N20 Chromebook Hardware Maintenance Manual

Lenovo N20 Chromebook Hardware Maintenance Manual

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Hardware Maintenance Manual
Lenovo N20 Chromebook

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Summary of Contents for Lenovo N20 Chromebook

  • Page 1 Hardware Maintenance Manual Lenovo N20 Chromebook...
  • Page 3 Hardware Maintenance Manual Lenovo N20 Chromebook...
  • Page 4 First Edition (May 2014) © Copyright Lenovo 2014.

  • Page 5: Table Of Contents

    ....45 Chapter 3. Idetifying FRUs (CRUs) . . 21 All FRUs (CRUs) for Lenovo N20 Chromebook . . Appendix B. Lenovo part numbers of Lenovo part numbers of replacement FRUs or screws used on N20 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 2014...

  • 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 2014...

  • 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 24 if you need to look up Lenovo part numbers for a particular FRU or CRU.
  • Page 28 Figure 1. N20 exploded view Hardware Maintenance Manual...
  • Page 29 Table 1. FRU (CRU) categories FRU (CRU) category CRU ID LCD module Keyboard Upper case Touch pad cable dc-in connector bracket dc-in connector System board WLAN & Bluetooth combo module I/O board cable I/O board Battery pack Speakers Base cover ac power adapter Power cord Note: A customer replaceable unit (CRU) is identified by a single asterisk (*) or two asterisks (**) in the CRU...

  • Page 30: Lenovo Part Numbers Of Replacement Frus Or Crus

    Camera cable LCD base cover Lenovo part numbers of replacement FRUs or CRUs 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.
  • Page 31 Table 3. Part numbers for FRUs (CRUs) (continued) Iceland75KeyST1CCCYBlackKeySilverFrame 25216096 Slovenian75KeyST1CCCYBlackKeySilverFrame 25216097 Swiss75KeyST1CCCYBlackKeySilverFrame 25216098 USInter74KeyST1CCCYBlackKeySilverFrame 25216099 Czh-Slk75KeyST1CCCYBlackKeySilverFrame 25216100 25216101 Bulgarian75KeyST1CCCYBlackKeySilverFrame India74KeyST1CCCYBlackKeySilverFrame 25216102 25216045 US74KeyST1CJMEBlackKeySilverFrame UK75KeyST1CJMEBlackKeySilverFrame 25216046 25216047 Italian75KeyST1CJMEBlackKeySilverFrame Spanish75KeyST1CJMEBlackKeySilverFrame 25216048 25216049 Turkish75KeyST1CJMEBlackKeySilverFrame Thailand74KeyST1CJMEBlackKeySilverFrame 25216050 25216051 Portugue75KeyST1CJMEBlackKeySilverFrame LatinSpa75KeyST1CJMEBlackKeySilverFrame 25216052 CanadFrEn75KeyST1CJMEBlackKeySilverFrame 25216053 Korean74KeyST1CJMEBlackKeySilverFrame 25216054 TradChine74KeyST1CJMEBlackKeySilverFrame...
  • Page 32 5C20G15029 Base cover Note: Refer to Appendix C “Lenovo part numbers of ac adapters and power cords” on page 49 to look up the Lenovo part numbers of ac power adapters and power cords. Table 4. Part numbers for LCD FRUs No.
  • Page 33 Table 4. Part numbers for LCD FRUs (continued) LCD Cable C N20 5C10G15008 Hinges Hinge L+R C N20 5H50G15024 WLAN antennas Antenna C N20 WIFI 5A30G15046 Camera board Camera C N20 5C20G15029 Camera cable Camera Cable C N20 5C10G15031 LCD base cover LCD Cover C N20 5CB0G15042 Chapter 3...
  • Page 34 Hardware Maintenance Manual...

  • Page 35: 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 B “Lenovo part numbers of screws used on N20 Chromebook” on page 47 for replacement screws and order them through the Lenovo CRM system.
  • Page 36 M2 × 3.5 mm, flat-head, nylon-coated 3.7 – 4.0 kgf * cm Refer to Table 3 “Part numbers for FRUs (CRUs)” on page 24 to look up the Lenovo part numbers of replacement keyboards. Note: Replacement keyboards are available in different languages and colors. Check the color and language type of the keyboard to be replaced and order an equivalent one.

  • Page 37: Remove The Upper Case

    Remove the upper case Make sure the following FRUs (CRUs) have been removed: “Remove the keyboard” on page 29 Step 1. Pry the two rubbers out of their recesses. Figure 6. Pry rubbers out of recesses Note: The rubbers are connected to the Chromebook through rubber pins and cannot be completely detached.
  • Page 38 M2 × 3.5 mm, flat-head, nylon-coated Black 1.7 — 2.0 kgf * cm Refer to Table 3 “Part numbers for FRUs (CRUs)” on page 24 to look up the Lenovo part numbers of the following replacement parts: Upper case Touch pad cable...

  • Page 39: Remove The Wlan & Bluetooth Combo Module

    Remove the WLAN & Bluetooth combo module Make sure the following FRUs (CRUs) have been removed: “Remove the keyboard” on page 29 “Remove the upper case” on page 31 Step 1. Disconnect the white and black cables from the WLAN & Bluetooth combo module Figure 10.

  • Page 40: Remove The Lcd Module

    Refer to Table 3 “Part numbers for FRUs (CRUs)” on page 24 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: “Remove the keyboard” on page 29 “Remove the upper case”...

  • Page 41: Remove The Dc-In Connector

    Figure 15. Lift up the LCD module Table 8. Screw specifications — removing the LCD module Screw Specifications Color Torque label M2.5 × 4 mm, flat-head, nylon-coated Black 3.7 – 4.0 kgf * cm The LCD module is not a FRU. It contains FRUs as its components. Refer to “Disassemble the LCD module” on page 40 if you need to replace a FRU contained in the LCD module.
  • Page 42 Figure 16. Unplug the dc-in cable Step 2. Remove the two screws and then remove the metal bracket that fastens the dc-in connector. Figure 17. Remove 2 screws Step 3. Remove the dc-in connector Hardware Maintenance Manual...

  • Page 43: Remove The Battery Pack

    M2 × 3 mm, flat-head, nylon-coated 1.7 — 2.0 kgf * cm Silvery Refer to Table 3 “Part numbers for FRUs (CRUs)” on page 24 to look up the Lenovo part numbers of the following replacement parts: dc-in bracket dc-in connector Remove the battery pack “Remove the keyboard”...

  • Page 44: Remove The Speakers

    M2 × 3 mm, flat-head, nylon-coated silvery 1.7 — 2.0 kgf * cm Refer to Table 3 “Part numbers for FRUs (CRUs)” on page 24 to look up the Lenovo part numbers of the following replacement parts: Battery pack I/O board cable...

  • Page 45: Remove The System Board And The I/O Board

    I/O board Figure 23. Remove the system board and the I/O board Refer to Table 3 “Part numbers for FRUs (CRUs)” on page 24 to look up the Lenovo part numbers of the following replacement parts: System board...

  • Page 46: Disassemble The Lcd Module

    Disassemble the LCD module The LCD module as a whole is not a FRU. It contains FRUs as its components. Before disassembling the LCD module, make sure it has been detached from the base cover. Refer to “Remove the LCD module” on page 34 for instructions.

  • Page 47: Remove The Lcd Panel

    M2.5 × 5 mm, flat-head, nylon-coated Silvery 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: Hinge covers LCD bezel...

  • Page 48: Remove The Hinges, The Lcd Cable, And The Wlan Antennas

    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 LCD cable Remove the hinges, the LCD cable, and the WLAN antennas Make sure the following FRUs (CRUs) have been removed: “Remove the LCD bezel”...

  • Page 49: Remove The Camera Board And The Camera Cable

    Step 3. Release the camera cable out of cable guides and then remove it. Refer to Table 4 “Part numbers for LCD FRUs” on page 26 to look up the Lenovo part numbers of the following replacement parts: Camera board...
  • Page 50 Hardware Maintenance Manual...

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

    Appendix A. Features, controls, and connectors Figure 32. N20 Chromebook features and connectors Table 14. N20 Chromebook features and connectors Feature or connector Integrated camera Microphone hole Shortcut keys Touch pad dc-in connector USB 3.0 connector HDMI (Type D) connector...
  • Page 52 Hardware Maintenance Manual...

  • Page 53: Appendix B. Lenovo Part Numbers Of Screws Used On N20

    Appendix B. Lenovo part numbers of screws used on N20 Chromebook Table 15. Part numbers of N20 screws Part number Screw description SCREW N20 M M2 2.0D 2L K 7D 5S10G15012 SCREW N20 M M 1.98D 3.0L K 4.6D 5S10G15015 SCREW N20 M2D 3L K 4.5D ZK...
  • Page 54 Hardware Maintenance Manual...

  • Page 55: Appendix C. Lenovo Part Numbers Of Ac Adapters And Power Cords

    Appendix C. Lenovo part numbers of ac adapters and power cords Table 16. Part numbers for FRUs (CRUs) CRU category Parts description Lenovo part number ac power adapter 36200602 Delta ADLX45NDC3A 20V2.25A adap(CMN) Liteon ADLX45NLC3A 20V2.25A adap(CMN) 36200606 36200610 Chicony ADLX45NCC3A 20V2.25A adap(CMN)
  • Page 56 Table 16. Part numbers for FRUs (CRUs) (continued) Longwell LP-71+VCTF+LS-33 145000556 VOLEX TW15CS3+VCTF+VAC5S 145000531 lux 0019+VCTF 0.75/3C+0021 145500007 LINETEK LS15+H05VV-F+LP-E04A 145000590 Longwell LP-486+KTLH03VV-F+LS-5 145000558 145000533 VOLEX M2511+KETI IEC+VAC5S lux 0033+H03VV-F 0.75/3C+0011 145500008 145000591 LINETEK LS15+H03VV-F+PE-336 Longwell LP-22+H03VV-F+LS-18 145000559 145000535 VOLEX IT10S3+HO3VV-F+VAC5S lux 0029+H03VV-F 0.75/3C+0011 145500009 145000586...

  • Page 57: Appendix D. Label Locations

    Malaysia 15 x 15 mm 144502860 20 x 10 mm 144502967 South Africa South Africa Indonesia label Indonesia 26 x 10 mm 144503356 KR KCC label Korea 50 x 16 mm Note: “N/A” means not applicable. © Copyright Lenovo 2014...
  • Page 58 Hardware Maintenance Manual...

  • Page 59: 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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