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About this manual

This manual contains service and reference information for the following Lenovo products.

Machine

Machine type (MT)

Lenovo Yoga S740-14IIL

81RS

Lenovo IdeaPad S740-14IIL

81RT

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

Summary of Contents for Yoga S740

Page 1: ...Lenovo IdeaPad S740 and Lenovo Yoga S740 Hardware Maintenance Manual ...

Page 2: ...First Edition August 2019 Copyright Lenovo 2019 ...

Page 3: ... Chapter 3 Identifying FRUs CRUs 23 Locate FRUs and CRUs 23 Chapter 4 Removing a FRU or CRU 25 Service tools 25 General guidelines 25 Remove the lower case 26 Remove the battery pack 27 Remove the speakers 29 Remove the WLAN card 30 Remove the solid state drive 32 Remove the thermal module 34 Remove the system board 36 Remove the upper case 37 Remove the I O board 38 Remove the LCD panel 40 Remove...

Page 4: ...ii Lenovo IdeaPad S740 and Lenovo Yoga S740 Hardware Maintenance Manual ...

Page 5: ...ine type MT Lenovo Yoga S740 14IIL 81RS Lenovo IdeaPad S740 14IIL 81RT 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 ...

Page 6: ...iv Lenovo IdeaPad S740 and Lenovo Yoga S740 Hardware Maintenance Manual ...

Page 7: ...or scarf inside 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 mig...

Page 8: ...d off Always look carefully for possible hazards in your work area Examples of these hazards are wet 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 wit...

Page 9: ...its ICs should be considered 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 t...

Page 10: ...utlet 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 IdeaPad S740 and Lenovo Yoga S740 Hardware Maintenance Manual ...

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

Page 12: ...6 Lenovo IdeaPad S740 and Lenovo Yoga S740 Hardware Maintenance Manual ...

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

Page 14: ...PERIGO PERIGO PERIGO PERIGO PERIGO 8 Lenovo IdeaPad S740 and Lenovo Yoga S740 Hardware Maintenance Manual ...

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

Page 16: ...DANGER DANGER DANGER DANGER VORSICHT 10 Lenovo IdeaPad S740 and Lenovo Yoga S740 Hardware Maintenance Manual ...

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

Page 18: ...VORSICHT VORSICHT VORSICHT 12 Lenovo IdeaPad S740 and Lenovo Yoga S740 Hardware Maintenance Manual ...

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

Page 20: ...14 Lenovo IdeaPad S740 and Lenovo Yoga S740 Hardware Maintenance Manual ...

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

Page 22: ...16 Lenovo IdeaPad S740 and Lenovo Yoga S740 Hardware Maintenance Manual ...

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

Page 24: ...18 Lenovo IdeaPad S740 and Lenovo Yoga S740 Hardware Maintenance Manual ...

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

Page 26: ...20 Lenovo IdeaPad S740 and Lenovo Yoga S740 Hardware Maintenance Manual ...

Page 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 ...

Page 28: ...toms 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 Yoga S740 14IIL Machine type 81RS CRU Type ac power adapter self ...

Page 29: ...Us that they may need to replace when servicing a customer s computer Figure 1 Lenovo IdeaPad S740 14IIL Lenovo Yoga S740 14IIL exploded view Table 3 FRU CRU categories No FRU CRU category 1 Removable tape L 2 LCD cover 3 Removable tape R 4 TOF sensor cable 5 Hinge R 6 Strip cover R 7 Upper case 8 I O board Copyright Lenovo 2019 23 ...

Page 30: ...Lower case 14 Speaker module 15 Battery mylar 16 SSD 17 System board 18 System board mylar 19 Hinge cap 20 Strip cover L 21 Hinge L 22 LCD module 23 EDP cable 24 Mic FPC 25 Mic board L 26 Camera FPC 27 Mic board R 28 Camera 24 Lenovo IdeaPad S740 and Lenovo Yoga S740 Hardware Maintenance Manual ...

Page 31: ...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...

Page 32: ...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 electrical short...

Page 33: ...up to look up the Lenovo part number of the following replacement part Lower case Remove the battery pack Make sure the following FRU or CRU has been removed Remove the lower case on page 26 Step 1 Disconnect the cable from the system board Attention Do not pull the cable Use your fingernail to disconnect the cable Chapter 4 Removing a FRU or CRU 27 ...

Page 34: ...nect the cable Step 2 Remove six screws Figure 5 Remove six screws Screw specifications Number of screws M2 x 4 6 Step 3 Remove the battery pack 28 Lenovo IdeaPad S740 and Lenovo Yoga S740 Hardware Maintenance Manual ...

Page 35: ...the following replacement part Battery pack Remove the speakers Make sure the following FRUs CRUs have been removed Remove the lower case on page 26 Remove the battery pack on page 27 Step 1 Disconnect the speaker cable from the system board Figure 7 Disconnect the speaker cable Chapter 4 Removing a FRU or CRU 29 ...

Page 36: ...ovo com partslookup to look up the Lenovo part number of the following replacement part Speakers Remove the WLAN card Make sure the following FRUs CRUs have been removed Remove the lower case on page 26 Remove the battery pack on page 27 Step 1 Peel off the mylar tape covering the WLAN card 30 Lenovo IdeaPad S740 and Lenovo Yoga S740 Hardware Maintenance Manual ...

Page 37: ...Figure 9 Peel off the mylar tape Step 2 Disconnect the wireless antennas cable Figure 10 Disconnect the wireless cable Step 3 Remove one screw Chapter 4 Removing a FRU or CRU 31 ...

Page 38: ... slot Figure 12 Pull the WLAN card Go to https support lenovo com partslookup to look up the Lenovo part number of the following replacement part WLAN card Remove the solid state drive Make sure the following FRUs or CRUs have been removed 32 Lenovo IdeaPad S740 and Lenovo Yoga S740 Hardware Maintenance Manual ...

Page 39: ...e one screw Screw specifications Number of screws M2 x 3 1 Step 2 Pull the solid state drive out of the slot Figure 14 Pull the solid state drive Go to https support lenovo com partslookup to look up the Lenovo part number of the following replacement part Solid state drive Chapter 4 Removing a FRU or CRU 33 ...

Page 40: ... the lower case on page 26 Remove the battery pack on page 27 Step 1 Remove six screws Figure 15 Remove six screws Screw specifications Number of screws M2 x 4 6 Step 2 Loosen five screws Figure 16 Loosen five screws 34 Lenovo IdeaPad S740 and Lenovo Yoga S740 Hardware Maintenance Manual ...

Page 41: ... sensor cable and power board cable Figure 17 Disconnect the cables Step 5 Remove the thermal module carefully Figure 18 Remove the thermal module Go to https support lenovo com partslookup to look up the Lenovo part number of the following replacement part Thermal module Chapter 4 Removing a FRU or CRU 35 ...

Page 42: ...WLAN card on page 30 Remove the solid state drive on page 32 Remove the thermal module on page 34 Step 1 Remove five screws Figure 19 Remove five screws Screw specifications Number of screws M2 x 4 5 Step 2 Disconnect all cables connected to the system board Then remove the system board 36 Lenovo IdeaPad S740 and Lenovo Yoga S740 Hardware Maintenance Manual ...

Page 43: ...per case Make sure the following FRUs CRUs have been removed Remove the lower case on page 26 Remove the battery pack on page 27 Remove the WLAN card on page 30 Remove the solid state drive on page 32 Remove the system board on page 36 Step 1 Rotate the LCD module to an angle of 90 degrees and place the computer on a flat surface Then remove four screws Chapter 4 Removing a FRU or CRU 37 ...

Page 44: ...se Figure 22 Remove the upper case Go to https support lenovo com partslookup to look up the Lenovo part number of the following replacement part Upper case Remove the I O board Make sure the following FRUs or CRUs have been removed 38 Lenovo IdeaPad S740 and Lenovo Yoga S740 Hardware Maintenance Manual ...

Page 45: ...e 30 Remove the solid state drive on page 32 Remove the system board on page 36 Remove the upper case on page 37 Step 1 Disconnect the cable connected to the I O board Figure 23 Disconnect cable from I O board Step 2 Remove two screws Figure 24 Remove two screws Chapter 4 Removing a FRU or CRU 39 ...

Page 46: ...lacement part I O board Remove the LCD panel Make sure the following FRUs CRUs have been removed Remove the lower case on page 26 Remove the battery pack on page 27 Remove the WLAN card on page 30 Remove the solid state drive on page 32 Remove the system board on page 36 Remove the upper case on page 37 Step 1 Remove the hinge cap 40 Lenovo IdeaPad S740 and Lenovo Yoga S740 Hardware Maintenance Ma...

Page 47: ...p Step 2 Remove two screws Figure 27 Remove two screws Screw specifications Number of screws M2 x 3 2 Step 3 Release EDP cable from the hooks and pull the adhesive tapes Then remove the LCD panel Chapter 4 Removing a FRU or CRU 41 ...

Page 48: ... FRUs or CRUs have been removed Remove the lower case on page 26 Remove the battery pack on page 27 Remove the WLAN card on page 30 Remove the solid state drive on page 32 Remove the system board on page 36 Remove the upper case on page 37 Remove the I O board on page 38 Remove the LCD panel on page 40 Step 1 Peel off the adhesive tape 42 Lenovo IdeaPad S740 and Lenovo Yoga S740 Hardware Maintenan...

Page 49: ...Figure 29 Peel off the adhesive tape Step 2 Remove the MIC board and EDP cables Figure 30 Remove the MIC board and EDP cables Step 3 Remove the camera Chapter 4 Removing a FRU or CRU 43 ...

Page 50: ...en removed Remove the lower case on page 26 Remove the battery pack on page 27 Remove the WLAN card on page 30 Remove the solid state drive on page 32 Remove the system board on page 36 Remove the upper case on page 37 Remove the I O board on page 38 Remove the LCD panel on page 40 Remove the camera and mic board on page 42 Step 1 Remove six screws 44 Lenovo IdeaPad S740 and Lenovo Yoga S740 Hardw...

Page 51: ...ovo com partslookup to look up the Lenovo part number of the following replacement part Hinges Remove the TOF sensor cable Make sure the following FRUs or CRUs have been removed Remove the lower case on page 26 Remove the battery pack on page 27 Remove the WLAN card on page 30 Remove the solid state drive on page 32 Chapter 4 Removing a FRU or CRU 45 ...

Page 52: ...ve the camera and mic board on page 42 Remove the hinge on page 44 Step 1 Remove the TOF sensor cable Figure 34 Remove the TOF sensor cable Go to https support lenovo com partslookup to look up the Lenovo part number of the following replacement part TOF sensor cable 46 Lenovo IdeaPad S740 and Lenovo Yoga S740 Hardware Maintenance Manual ...

Page 53: ...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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