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Contents

About this manual . . . . . . . . . . . . iii

Chapter 1. Safety information . . . . . . 1

General safety .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  1
Electrical safety .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  1
Safety inspection guide .  .  .  .  .  .  .  .  .  .  .  .  .  2
Handling devices that are sensitive to electrostatic
discharge .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  3
Grounding requirements .  .  .  .  .  .  .  .  .  .  .  .  4
Safety notices (multilingual translations) .  .  .  .  .  .  4

Chapter 2. General checkout . . . . . 21

What to do first . . . . . . . . . . . . . . . 21
CRU list . . . . . . . . . . . . . . . . . . 22

Chapter 3. Create and use a USB
repair shim . . . . . . . . . . . . . . . 23

What is a USB repair shim? .  .  .  .  .  .  .  .  .  .  23
Create a repair shim .  .  .  .  .  .  .  .  .  .  .  .  .  23
Use a USB repair shim to diagnose and fix
problems .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  23

Factory test items . . . . . . . . . . . . 24

Chapter 4. Idetifying FRUs (CRUs) . . 27

Locate FRU and CRU . . . . . . . . . . . . 27

Chapter 5. Removing a FRU or
CRU . . . . . . . . . . . . . . . . . . 31

Содержание 81T9

Страница 1: ...Lenovo Chromebook C340 15 Hardware Maintenance Manual ...

Страница 2: ...First Edition June 2019 Copyright Lenovo 2019 ...

Страница 3: ...SB repair shim 23 Create a repair shim 23 Use a USB repair shim to diagnose and fix problems 23 Factory test items 24 Chapter 4 Idetifying FRUs CRUs 27 Locate FRU and CRU 27 Chapter 5 Removing a FRU or CRU 31 Service tools 31 General guidelines 31 Remove the lower case 32 Remove the battery pack 33 Remove the WLAN card 34 Remove the upper case 36 Remove the fan 37 Remove the I O board with cable 3...

Страница 4: ...ii Lenovo Chromebook C340 15 Hardware Maintenance Manual ...

Страница 5: ...s Machine Machine type MT Lenovo Chromebook C340 15 81T9 Important This manual is intended only for trained service technicians who are familiar with Lenovo products Before servicing a Lenovo product be sure to read all the information under Chapter 1 Safety information on page 1 Copyright Lenovo 2019 iii ...

Страница 6: ...iv Lenovo Chromebook C340 15 Hardware Maintenance Manual ...

Страница 7: ...e clothing or fasten it with a non conductive clip about 8 centimeters 3 inches from the end Do not wear jewelry chains metal frame eyeglasses or metal fasteners for your clothing Attention Metal objects are good electrical conductors Wear safety glasses when you are hammering drilling soldering cutting wire attaching springs using solvents or working in any other conditions that might be hazardou...

Страница 8: ...ssible hazards in your work area Examples of these hazards are moist floors non grounded power extension cables power surges and missing safety grounds Do not touch live electrical circuits with the reflective surface of a plastic dental mirror The surface is conductive such touching can cause personal injury and machine damage Do not service the following parts with the power on when they are rem...

Страница 9: ...d sensitive to electrostatic discharge ESD ESD damage can occur when there is a difference in charge between objects Protect against ESD damage by equalizing the charge so that the machine the part the work mat and the person handling the part are all at the same charge Notes 1 Use product specific ESD procedures when they exceed the requirements noted here 2 Make sure that the ESD protective devi...

Страница 10: ...trical outlet can be verified by a certified electrician Safety notices multilingual translations The safety notices in this section are provided in the following languages English Arabic Brazilian Portuguese French German Hebrew Japanese Korean Spanish Traditional Chinese DANGER DANGER DANGER 4 Lenovo Chromebook C340 15 Hardware Maintenance Manual ...

Страница 11: ...DANGER DANGER DANGER DANGER DANGER Chapter 1 Safety information 5 ...

Страница 12: ...6 Lenovo Chromebook C340 15 Hardware Maintenance Manual ...

Страница 13: ...PERIGO PERIGO PERIGO Chapter 1 Safety information 7 ...

Страница 14: ...PERIGO PERIGO PERIGO PERIGO PERIGO 8 Lenovo Chromebook C340 15 Hardware Maintenance Manual ...

Страница 15: ...DANGER DANGER DANGER DANGER Chapter 1 Safety information 9 ...

Страница 16: ...DANGER DANGER DANGER DANGER VORSICHT 10 Lenovo Chromebook C340 15 Hardware Maintenance Manual ...

Страница 17: ...VORSICHT VORSICHT VORSICHT VORSICHT Chapter 1 Safety information 11 ...

Страница 18: ...VORSICHT VORSICHT VORSICHT 12 Lenovo Chromebook C340 15 Hardware Maintenance Manual ...

Страница 19: ...Chapter 1 Safety information 13 ...

Страница 20: ...14 Lenovo Chromebook C340 15 Hardware Maintenance Manual ...

Страница 21: ...Chapter 1 Safety information 15 ...

Страница 22: ...16 Lenovo Chromebook C340 15 Hardware Maintenance Manual ...

Страница 23: ...Chapter 1 Safety information 17 ...

Страница 24: ...18 Lenovo Chromebook C340 15 Hardware Maintenance Manual ...

Страница 25: ...Chapter 1 Safety information 19 ...

Страница 26: ...20 Lenovo Chromebook C340 15 Hardware Maintenance Manual ...

Страница 27: ...hen you return a FRU you must include the following information in the parts exchange form or parts return form that you attach to it 1 Name and phone number of service technician 2 Date of service 3 Date on which the machine failed 4 Date of purchase 5 Failure symptoms error codes appearing on the display and beep symptoms 6 Procedure index and page number in which the failing FRU was detected 7 ...

Страница 28: ...n incorrect ac power adapter on laptop products The following symptoms might indicate damage caused by non warranted activities Missing parts might be a symptom of unauthorized service or modification Check for obvious damage to a hard disk drive If the spindle of a hard disk drive becomes noisy the hard disk drive might have been dropped or subject to excessive force CRU list Table 1 Model Lenovo...

Страница 29: ...rvice credential is needed to download the image file Attention Make sure to download the latest version of the image file A shim created with an earlier version of the image file may cause the repair process to fail Step 3 Use a disk image tool to write the downloaded image to the USB drive An open source tool Win32 Disk Imager is available for download at http sourceforge net projects win32diski...

Страница 30: ...f the GoogleRequiredTests fails refer to Common issues leading to GoogleRequiredTests fail on page 25 Note If any test is marked as failed the final process cannot be completed The final process can be forced to end by pressing the f key Do not force the final process to end when a component fails the test Force the final process to end only when the test has to be bypassed because it cannot be pe...

Страница 31: ...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 Write protect function is off System cannot be finalized until the write protect function is turned back on Hardware identify A set of valid hardware identities HWIDs are provided by Google Google logs the exact har...

Страница 32: ...26 Lenovo Chromebook C340 15 Hardware Maintenance Manual ...

Страница 33: ... Idetifying FRUs CRUs Locate FRU and CRU The exploded illustrations help Lenovo service technicians identify FRU or CRU that they may need to replace when servicing a customer s computer Copyright Lenovo 2019 27 ...

Страница 34: ...Figure 1 Lenovo Chromebook C340 15 exploded view Table 4 FRU CRU categories No FRU CRU category 1 LCD cover 2 Camera 28 Lenovo Chromebook C340 15 Hardware Maintenance Manual ...

Страница 35: ...ed 3 Hinge 2 4 Hinge rubber 2 5 Strip cover 3 6 System board 7 I O board 8 Heat sink 9 Fan 10 Lower case 11 Battery pack 12 Speakers 13 WLAN card 14 Upper case 15 LCD panel 16 EDP cable 17 Sensor board Chapter 4 Idetifying FRUs CRUs 29 ...

Страница 36: ...30 Lenovo Chromebook C340 15 Hardware Maintenance Manual ...

Страница 37: ...ctrical tape Double sided tape Conductive tape Eraser Heat gun Brown brush Notes T30 screw drivers are used to service the new Intel Xeon CPUs Hexagonal sockets are used to remove antenna connectors Silicone grease is applied to the CPU and heatsink surfaces to eliminate air gaps General guidelines When removing or replacing a FRU ensure that you observe the following general guidelines 1 Do not t...

Страница 38: ...ving any FRU or CRU shut down the computer and unplug all power cords from electrical outlets Attention After replacing a FRU do not turn on the computer until you have ensured that all screws springs and other small parts are in place and none are loose inside the computer Verify this by shaking the computer gently and listening for rattling sounds Metallic parts or metal flakes can cause electri...

Страница 39: ... partslookup to look up the Lenovo part numbers of the following replacement part Lower case Remove the battery pack Make sure the following FRU or CRU have been removed Remove the lower case on page 32 Step 1 Disconnect the cable from the system board and remove four screws Attention Use your fingernail to pull the connector to unplug it Do not pull the cable Chapter 5 Removing a FRU or CRU 33 ...

Страница 40: ...mm 4 Step 2 Remove the battery pack Figure 5 Remove the battery pack Go to https support lenovo com partslookup to look up the Lenovo part numbers of the following replacement part Battery pack Remove the WLAN card Make sure the following FRU or CRU have been removed 34 Lenovo Chromebook C340 15 Hardware Maintenance Manual ...

Страница 41: ...p 1 Disconnect the wireless antenna cables from the WLAN card Figure 6 Disconnect the wireless antenna cables Step 2 Remove one screw Figure 7 Remove one screw Screw specification Number of screw M2 0 x 3 0 mm 1 Step 3 Remove the WLAN card Chapter 5 Removing a FRU or CRU 35 ...

Страница 42: ...WLAN card Remove the upper case Make sure the following FRU CRU have been removed Remove the lower case on page 32 Remove the battery pack on page 33 Step 1 Disconnect the cable of LCD module from the system board and remove six screws Figure 9 Disconnect the cable and remove six screws 36 Lenovo Chromebook C340 15 Hardware Maintenance Manual ...

Страница 43: ... lenovo com partslookup to look up the Lenovo part numbers of the following replacement part Upper case Remove the fan Make sure the following FRUs or CRUs have been removed Remove the lower case on page 32 Remove the battery pack on page 33 Step 1 Disconnect the fan cable from the system board and remove two screws Chapter 5 Removing a FRU or CRU 37 ...

Страница 44: ...m 2 Step 2 Remove the fan Figure 12 Remove the fan Go to https support lenovo com partslookup to look up the Lenovo part numbers of the following replacement part Fan Remove the I O board with cable Make sure the following FRU or CRU have been removed 38 Lenovo Chromebook C340 15 Hardware Maintenance Manual ...

Страница 45: ...3 Step 1 Disconnect the cables from the I O board Figure 13 Disconnect the cables from the I O board Step 2 Remove two screws Figure 14 Remove two screws Screw specification Number of screws M2 0 x 3 0 mm 2 Step 3 Remove the I O board Chapter 5 Removing a FRU or CRU 39 ...

Страница 46: ...om the system board Go to https support lenovo com partslookup to look up the Lenovo part numbers of the following replacement part I O board with cable Remove the heat sink Make sure the following FRU or CRU have been removed Remove the lower case on page 32 Remove the battery pack on page 33 40 Lenovo Chromebook C340 15 Hardware Maintenance Manual ...

Страница 47: ...ure 18 Remove the heat sink Go to https support lenovo com partslookup to look up the Lenovo part numbers of the following replacement part Heat sink Remove the speakers Make sure the following FRU CRU have been removed Remove the lower case on page 32 Chapter 5 Removing a FRU or CRU 41 ...

Страница 48: ...he following replacement part Speakers Remove the system board Make sure the following FRU or CRU have been removed Remove the lower case on page 32 Remove the battery pack on page 33 Remove the WLAN card on page 34 Remove the upper case on page 36 Remove the fan on page 37 Remove the I O board with cable on page 38 Remove the heat sink on page 40 Step 1 Disconnect the cables connected to the syst...

Страница 49: ...igure 20 Disconnect cables Step 2 Remove three screws Figure 21 Remove three screws Screw specifications Number of screws M2 0 x 3 0 mm 3 Step 3 Remove the system board Chapter 5 Removing a FRU or CRU 43 ...

Страница 50: ...ng replacement part System board Remove the LCD module Make sure the following FRU CRU have been removed Remove the lower case on page 32 Remove the battery pack on page 33 Remove the upper case on page 36 Step 1 Remove the strip covers Figure 23 Remove the strip covers 44 Lenovo Chromebook C340 15 Hardware Maintenance Manual ...

Страница 51: ... two screws Screw specification Number of screws M2 0 x 3 0 mm 2 Step 3 Turn the LCD panel and disconnect cables form the LCD panel Figure 25 Turn the LCD panel and disconnect cables Step 4 Remove six screws Chapter 5 Removing a FRU or CRU 45 ...

Страница 52: ... hinges Figure 27 Remove the hinges Go to https support lenovo com partslookup to look up the Lenovo part numbers of the following replacement part LCD module Remove the camera and sensor board Make sure the following FRU CRU have been removed 46 Lenovo Chromebook C340 15 Hardware Maintenance Manual ...

Страница 53: ...move the LCD module on page 44 Step 1 Disconnect the camera connector and remove the camera Figure 28 Disconnect the camera connector and remove the camera Step 2 Remove the camera connector cable Figure 29 Remove the camera connector cable Step 3 Remove the sensor board Chapter 5 Removing a FRU or CRU 47 ...

Страница 54: ...emove the sensor board Go to https support lenovo com partslookup to look up the Lenovo part numbers of the following replacement parts Camera Sensor board 48 Lenovo Chromebook C340 15 Hardware Maintenance Manual ...

Страница 55: ...Trademarks LENOVO and the LENOVO logo are trademarks of Lenovo All other trademarks are the property of their respective owners 2019 Lenovo ...

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