Hardware Maintenance Manual Lenovo N22–20 Chromebook
Hardware Maintenance Manual Lenovo N22–20 Chromebook
First Edition (February 2016) © Copyright Lenovo 2016.
Contents Chapter 1. Safety information . . . . . . 1 General safety . . . . . . . . . . . . . . . Electrical safety . . . . . . . . . . . . . . Safety inspection guide . . . . . . . . . . . Handling devices that are sensitive to electrostatic discharge. . . . . . . . . . . . . . . . . Grounding requirements . . . . . . . . . . . Safety notices (multilingual translations) . . . . . . . . 1 1 2 . . . 3 4 4 Chapter 2. General checkout . . . . . 19 What to do first . . . . . . . . . . . . . .
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Chapter 1. Safety information This chapter presents the following safety information that you need to be familiar with before you service a Lenovo notebook computer. General safety Follow these rules to ensure general safety: • Observe good housekeeping in the area of the machines during and after maintenance. • When lifting any heavy object: 1. Make sure that you can stand safely without slipping. 2. Distribute the weight of the object equally between your feet. 3. Use a slow lifting force.
– Removing or installing main units • Before you start to work on the machine, unplug the power cord. If you cannot unplug it, ask the customer to power-off the wall box that supplies power to the machine, and to lock the wall box in the off position. • If you need to work on a machine that has exposed electrical circuits, observe the following precautions: – Ensure that another person, familiar with the power-off controls, is near you.
To determine whether there are any potentially unsafe conditions, use the following checklist at the beginning of every service task. Begin the checks with the power off, and the power cord disconnected. Checklist: 1. Check exterior covers for damage (loose, broken, or sharp edges). 2. Power off the computer. Disconnect the power cord. 3. Check the power cord for: a. A third-wire ground connector in good condition. Use a meter to measure third-wire ground continuity for 0.
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.
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Chapter 2. General checkout This chapter contains the following topics: Before you go to the checkout instructions, ensure that you read the following important notes. Important notes: • Only certified trained personnel should service the computer. • Before replacing any FRU, read the entire page on removing and replacing FRUs. • When you replace FRUs, it is recommended to use new nylon-coated screws. • Be extremely careful during such write operations as copying, saving, or formatting.
• 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 • Forgotten computer password (making the computer unusable) • Sticky keys caused by spilling a liquid onto the keyboard • Use of an incorrect ac power adapter on laptop products The following symptoms might indicate damage caused by non-warranted activities: • Missing pa
Chapter 3. Idetifying FRUs (CRUs) All FRUs (CRUs) for Lenovo N22–20 Chromebook 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 43 if you need to look up Lenovo part numbers for a particular FRU or CRU.
1 3 2 4 6 5 7 9 10 Figure 1. N22–20 exploded view Table 1. FRU (CRU) categories No.
Table 1. FRU (CRU) categories (continued) 7 WLAN & Bluetooth combo module 8 USB board 9 DC-in cable 10 Base cover 1 3 2 3 4 5 6 Figure 2. LCD module — exploded view Table 2. FRU categories for the LCD module No. FRU (CRU) category 1 LCD bezel 2 LCD panel Chapter 3.
Table 2.
Chapter 4. Removing a FRU or CRU General guidelines When removing or replacing a FRU, ensure that you observe the following general guidelines: 1. Do not try to service any computer unless you have been trained and certified. An untrained person runs the risk of damaging parts. 2. Begin by removing any FRUs that have to be removed before replacing the failing FRU. Any such FRUs are listed at the beginning of each FRU replacement procedure. Remove them in the order in which they are listed. 3.
Figure 3. Pry rubbers out of recesses Note: The recesses and rubbers are marked with capital letters A, B, C, and D. Make sure that all rubbers are put in the right recesses when installing new rubbers. Step 2. Remove the screws. Figure 4. Remove 10 screws Table 3. Screw specifications Screw location Number Specifications Color Torque on base cover 10 M2 × 4.5mm, flat-head, nylon-coated Black 1.85 +/0.15kgf-cm Step 3. Turn over the Chromebook and open the LCD cover to 180 degrees. Step 4.
Figure 5. Lift the upper case Step 5. Open the keyboard and touch pad sockets, detach the cables, and pull up the upper case. Refer to Table 12 “Part numbers for FRUs (CRUs)” on page 43 to look up the Lenovo part numbers for the following replacement parts: Upper case Foot rubber pack Remove the battery pack Make sure the following FRUs (or CRUs) have been removed. “Remove the upper case (with keyboard)” on page 25 Step 1.
Table 4. Screw specifications Screw location Number Specifications Color Torque Battery pack to base cover 3 M2 × 3mm, flat-head, nylon-coated Black 1.85 +/0.15kgf-cm Refer to Table 12 “Part numbers for FRUs (CRUs)” on page 43 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. “Remove the upper case (with keyboard)” on page 25 “Remove the battery pack” on page 27 Step 1.
a b Figure 8. Remove the cable Step 2. Remove the two screws and then remove the I/O board. Figure 9. Remove the USB board Refer to Table 12 “Part numbers for FRUs (CRUs)” on page 43 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. “Remove the upper case (with keyboard)” on page 25 Step 1.
a a Figure 10. Disconnect antenna cables Step 2. Remove the screw 2 . Table 5. Screw specifications — removing the WLAN & Bluetooth combo module Screw location Number WLAN&Bluetooth 1 combo card to base cover Specifications Color Torque M2 × 3mm, flat-head, nylon-coated Black 1.85 +/0.15kgf-cm b Figure 11. Remove one screw Step 3. Pull out the WLAN & Bluetooth combo module in the direction shown by the arrow 3 . c Figure 12.
Remove the LCD module Make sure the following FRUs (CRUs) have been removed and the battery connector has been detached. “Remove the upper case (with keyboard)” on page 25 “Remove the WLAN & Bluetooth combo module” on page 29 Step 1. Open the socket and detach the LCD cable 1 . a Figure 13. Unplug the LCD cable Step 2. Remove the screws. b b b b Figure 14. Remove 4 screws Table 6. Screw specifications — removing the LCD module Screw Number Specifications location LCD to base cover 4 M2.
Step 3. Lift up the LCD module to detach it from the base cover. The LCD module is not a FRU. Instead, it contains FRUs as its components. Refer to “Disassemble the LCD module” on page 33 if you need to replace a FRU contained in the LCD module.
c c c c c Figure 16. Remove the system board Step 3. Remove the DC-in cable. Figure 17. Remove the DC-in cable Refer to Table 12 “Part numbers for FRUs (CRUs)” on page 43 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. Instead, it contains FRUs as its components. Before disassembling the LCD module, make sure it has been detached from the base cover.
a a a a a a Figure 18. Pry the six rubbers Step 2. Remove the six screws 2 . b b b b b b Figure 19. Remove 6 screws Table 8. Screw specifications — removing the LCD bezel Step 3. 34 Screw location Number Specifications Color Torque LCD bezel to LCD base cover 6 M2.5 × 3.5 mm, flat-head, nylon-coated Black 3.7 — 4.0 kgf * cm Insert your fingernails under one inner side of the LCD bezel and the LCD panel and then carefully pull the LCD bezel outwards.
c c c c Figure 20. Remove the LCD bezel Attention: Do not pull the LCD bezel from the outer side of the LCD bezel, otherwise the hooks may be damaged. Step 4. Remove the LCD bezel. Refer to Table 13 “Part numbers for LCD FRUs” on page 44 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. “Remove the LCD bezel” on page 33 Step 1.
Table 9. Screw specifications — removing the LCD panel Screw Number location LCD panel to base cover Step 2. 4 Specifications Color Torque M2 × 2.5 mm, flat-head, nylon-coated Silvery 1.7 — 2.0 kgf * cm Check the back side of the LCD panel for the LCD connector and then unplug the LCD cable 3 . c Figure 22. Disconnect the LCD cable from the back of the LCD panel Step 3. Remove the LCD panel.
c c Figure 24. Remove two screws Step 3. Unplug the LCD & Camera cable from the camera board. d Figure 25. Unplug LCD & camera cable Step 4. Remove the LCD & camera cable or the camera assembly. If you need to replace the LCD & camera cable, tear if off the LCD base cover. If you need to replace the camera assembly, remove the two screws that secure the camera on the LCD base cover. Figure 26.
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. Step 1. Connect the LCD cable with the camera board. Figure 27. Connect with LCD cable Step 2. Install the camera assembly cover and secure it with screws. Figure 28. Install camera cover Step 3. Paste the camera assembly mylar. Figure 29.
“Remove the LCD panel” on page 35 Step 1. Remove the screws. a a b a a b Figure 30. Remove the hinges Table 10. Screw specifications — removing the hinges and the WLAN antennas Screw Number location hinges to LCD base cover Step 2. 4 Specifications Color Torque M2.5 × 3.5 mm, flat-head, nylon-coated Silver 3.7 — 4.0 kgf * cm Remove the hinges. Refer to Appendix B “Lenovo part numbers for replacement FRUs” on page 43 to look up the Lenovo part numbers for the replacement hinges. Chapter 4.
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Appendix A. Features, controls, and connectors Figure 31. N22–20 Chromebook features and connectors Table 11. N21 Chromebook features and connectors No. Feature or connector 1 Swivel camera 2 Microphone hole 3 Handle bar 4 Shortcut keys 5 Touch pad 6 DC-in jack 7 DC-in indicator 8 HDMI connector 9 USB 3.0 connector 10 Memory card (SD/MMC) slot 11 Combo audio jack 12 Speakers 13 Kensington lock slot 14 USB 2.
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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 12. Part numbers for FRUs (CRUs) No.
Table 12. Part numbers for FRUs (CRUs) (continued) I/O Board Q N21 W/Cable 5C50H70342 DC-IN Cable Q 80SF 5C10L16464 Lower Case Q 80SF 5CB0L13240 10 DC-in cable 11 Lower case Note: Refer to Appendix C “Lenovo part numbers for CRUs and miscellaneous parts” on page 45 to look up the Lenovo part numbers of ac power adapters and power cords. Table 13. Part numbers for LCD FRUs No.
Appendix C. Lenovo part numbers for CRUs and miscellaneous parts The power cords and ac adapters are CRUs. Table 14. Part numbers for FRUs (CRUs) CRU category Parts description Lenovo part number Screw Pack Q 80SF 5C20H70344 Foot Rubber Pack Q 80SF 5F40L13234 Chicony ADLX45NCC3A 20V2.25A adap R SA10L02297 Acbel ADLX45NAC3A 20V2.
Table 14.
Table 14. Part numbers for FRUs (CRUs) (continued) lux 0018(E)+VCTF 0.75/3C+0021 1米电源线 145500005 lux 0044+H03VV-F 0.75/3C+0011 1米电源线 145500010 lux 0033+H03VV-F 0.75/3C+0011 1米电源线 145500001 Appendix C.
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Appendix D. Label locations a b c d e Figure 32. Label layout on the back side of the base cover Labels attached to the base cover are country/region specific. Make sure to apply the appropriate labels to the replacement base cover. Table 15.
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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.
