Lenovo N21 Chromebook Hardware Maintenance Manual - Lenovo N21 Chromebook
Lenovo N21 Chromebook Manual
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Lenovo N21 Chromebook manual content summary:
- Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 1
Hardware Maintenance Manual Lenovo N21 Chromebook - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 2
- Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 3
Hardware Maintenance Manual Lenovo N21 Chromebook - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 4
First Edition (March 2015) © Copyright Lenovo 2015. - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 5
19 Checking the ac power adapter 20 Chapter 3. Idetifying FRUs (CRUs) . . 21 All FRUs (CRUs) for Lenovo N21 Chromebook . . 21 Lenovo part numbers of replacement FRUs or CRUs 25 Chapter 4. Removing a FRU or CRU . 27 General guidelines 27 Remove the upper case and the battery. . . . . 27 Remove the - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 6
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before you service a Lenovo notebook computer all personnel, while you are servicing the machine. • Keep your tool case away from walk areas so working in any other conditions that might be hazardous to your eyes. • After service, reinstall all safety shields, guards, labels, and ground wires. Replace - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 8
probe leads and accessories for that tester. - Stand on suitable rubber mats (obtained locally, if necessary) to insulate you from grounds such as metal floor strips and machine frames. Observe the special safety precautions when you work with very high voltages; Instructions for these precautions - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 9
wrist strap against your skin to eliminate static service requirement. Note: The use of a grounding system to guard against ESD damage is desirable but not necessary. - Attach the ESD ground clip to any frame ground, ground braid, or green-wire ground. - When working on a double-insulated or battery - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 10
section are provided in the following languages: • English • Arabic • Brazilian Portuguese • French • German • Hebrew • Japanese • Korean • Spanish • Traditional Chinese DANGER DANGER DANGER DANGER 4 Hardware Maintenance Manual - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 11
DANGER DANGER DANGER DANGER Chapter 1. Safety information 5 - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 12
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PERIGO PERIGO PERIGO PERIGO Chapter 1. Safety information 7 - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 14
PERIGO PERIGO PERIGO PERIGO DANGER DANGER 8 Hardware Maintenance Manual - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 15
DANGER DANGER DANGER DANGER DANGER Chapter 1. Safety information 9 - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 16
DANGER VORSICHT VORSICHT VORSICHT VORSICHT 10 Hardware Maintenance Manual - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 17
VORSICHT VORSICHT VORSICHT VORSICHT Chapter 1. Safety information 11 - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 18
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Chapter 1. Safety information 13 - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 20
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Chapter 1. Safety information 15 - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 22
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Chapter 1. Safety information 17 - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 24
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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 Before checking problems with the Lenovo 2015 19 - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 26
voltage is not correct, replace the ac power adapter. • If the voltage is acceptable, do the following: a. 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. 20 Hardware Maintenance Manual - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 27
3. Idetifying FRUs (CRUs) All FRUs (CRUs) for Lenovo N21 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 "Lenovo part numbers of replacement FRUs or CRUs" on page 25 if you need - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 28
3 7 10 11 Figure 1. N21 exploded view Table 1. FRU (CRU) categories No. FRU (CRU) category 1 LCD module 2 Foot rubber pack 3 Upper case 4 Battery pack 5 Thermal module 6 System board 22 Hardware Maintenance Manual 1 2 4 5 6 8 9 CRU ID N N N N N N - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 29
N 10 DC-in cable N 11 Lower case N 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. A single asterisk (*) means that the part is a Self-service CRU; two asterisks (**) means that the - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 30
1 3 2 3 4 6 5 7 8 Figure 2. LCD module - exploded view Table 2. FRU categories for the LCD module No. FRU (CRU) category 1 LCD bezel 2 LCD panel 3 Hinges 4 EDP cable and LCD cable 5 Camera board 6 Camera cover 24 Hardware Maintenance Manual CRU ID N N N N N N - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 31
replacement parts through Lenovo CRM (customer relationship management) system. Table 3. Part numbers for FRUs (CRUs) No. FRU (CRU) category 2 Foot rubber pack Parts description 3 Upper case Foot Rubber Pack Q N21 Upper Case Q N21 W/Touchpad US 4 Battery pack Upper Case Q N21 W/Touchpad - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 32
Camera Q N21 W/Pad 7 WLAN antennas Camera Cover Q N21 W/Bezel/Hinge 8 LCD base cover Antenna Q N21 Main+AUX LCD Cover Q N21 Lenovo part number 5B30H70349 5D10H11015 5D10H34460 18201680 5D10H34773 5H50H70346 5C10H71607 5C20H70344 5C20H72540 5A30H70347 5CB0H70357 26 Hardware Maintenance Manual - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 33
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. 7. When replacing Attention: After replacing a FRU, do not turn on the case and the battery Step 1. Pry the four rubbers out of their - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 34
e e e e e Figure 4. Remove 10 screws Step 3. Turn over the Chromebook and open the LCD cover. Step 4. Use a pry bar to slide through the grooves between the upper case and the base cover 6 , and then slowly lift the upper case until the keyboard socket appears 7 . 28 Hardware Maintenance Manual - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 35
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. Detach the touchpad cable 9 . Open the keyboard socket 10 , pull out the keyboard cable 11 , and then remove the upper case in - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 36
Color Black Black Torque 1.85 +/- 0.15kgf-cm 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 battery pack 30 Hardware Maintenance Manual - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 37
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 1 . a Figure 9. Remove the speakers Step 2. Remove the four screws 2 and then remove the - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 38
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" the I/O board. cc Figure 12. Remove the I/O board 32 Hardware Maintenance Manual - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 39
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. Disconnect the white and black cables - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 40
-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 screws 2 that fix the LCD module to the base cover. 34 Hardware Maintenance Manual - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 41
components. Refer to "Disassemble the LCD module" on page 37 if you need to replace a FRU contained in the LCD module. Remove the thermal module, the system board and the DC-in cable "" on page "Remove the battery pack" on page "Remove the speakers" on page 31 Chapter 4. Removing a FRU or CRU - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 42
20. Remove the thermal module Step 3. Remove the five screws 3 and then remove the system board. c c c c c Figure 21. Remove the system board 36 Hardware Maintenance Manual - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 43
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 to "Remove the LCD module" on page 34 for instructions. Remove the LCD bezel Step 1. Pry the six rubber pads 1 from the LCD - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 44
along the inner edges of the LCD bezel until all hooks that secure the LCD bezel are detached. Remove the LCD bezel 3 . 38 Hardware Maintenance Manual - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 45
-head, nylon-coated Color Black Torque 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 LCD bezel Remove the LCD panel "Remove the LCD bezel" on page 37 Step 1. Remove the four screws - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 46
* 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 2. Tear off the mylar on the camera module 2 . 40 Hardware Maintenance Manual - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 47
b Figure 29. Tear off the mylar Step 3. Remove the two screws 3 and then remove the camera cover. c c Figure 30. Remove the camera cover Step 4. Detach the LCD cable and EDP cable in the direction shown by arrow 4 . d Figure 31. Remove the LCD cable and EDP cable Step 5. Remove the one screw 5 and - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 48
guides guides, or a wire to be broken. 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 guides; - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 49
.5 × 3.5 mm, flat-head, nylon-coated Color Silver Torque 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) Antennas (left and right) Chapter 4. Removing a FRU or CRU 43 - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 50
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, controls, and connectors Figure 35. N21 Chromebook features and connectors Table 13. 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 AC power adapter 7 DC-in indicator 8 HDMI connector - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 52
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MTM Dimensions Weights CPU Swivel camera LCD Size Resolutions Backlight type Memory Type/speed Capacity Expandable Storage Type Form factor Capacity Battery pack Type Cells and capacity ac adapter Input Output Power I/O ports Video/audio Audio USB Memory card Lenovo N21 Chromebook 80MG 300 - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 54
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Appendix C. Lenovo part numbers of screws used on N21 Chromebook Table 14. Part numbers of N21 screws Screw description Screw Pack Q N21 Part number 5S10H70356 © Copyright Lenovo 2015 49 - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 56
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Appendix D. Lenovo part numbers of ac adapters and power cords Table 15. Part numbers for FRUs (CRUs) CRU category Parts description ac power adapter Adapter Q N21 Power cord LINETEK LP-61L+ H03VV-F+ LS15 Longwell LP-61L+H03VV-F+LS-18 VOLEX MP5004+H03VV-F+VAC5S lux 0031+H03VV-F 0.75/3C+ - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 58
145-000565 145-000524 145-500013 145-000598 145-000566 145-000534 145-500014 145-000599 145-000567 145-000528 145-500015 52 Hardware Maintenance Manual - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 59
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 53 - Lenovo N21 Chromebook | Hardware Maintenance Manual - Lenovo N21 Chromebook - Page 60
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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.
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