Lenovo Yoga 3 Service Manual

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General checkout 
General checkout 
This chapter presents the following information:
• “What to do first” on page 20
•  “Power system checkout” on page 21
Before you go to the checkout, make sure to read the following important notes:
Important notes:
•	 Only	certified	trained	personnel	can	service	the	computer.
•	 Before 	replacing 	any 	FRU, 	read 	the 	entire 	page 	on 	removing 	and 	replacing	
FRUs.
•	 Carefully	remove	screws	for 	reuse	when	replacing	FRUs.
•	 Be 	extremely 	careful 	during 	such 	write 	operations 	as 	copying, 	saving, 	or 	
formatting. 	Drives 	in 	the 	computer 	that 	you 	are 	servicing 	sequence 	might	
have 	been 	altered. 	If 	you 	select 	an 	incorrect 	drive, 	data 	or 	programs 	might 	be	
overwritten.
•	 Replace 	an 	FRU 	only 	with 	another 	FRU 	of 	the 	correct 	model. 	When 	you	
replace	 an	FRU,	 make	sure	that	the	machine	 model	and	the	FRU	 part	number	 are	
correct	by	referring	to	the	FRU	parts	list.	
•	 An 	FRU 	should 	not 	be 	replaced 	just 	because 	of 	a 	single, 	unreproducible 	
failure. 	Single 	failures 	can 	occur 	for 	a 	variety 	of 	reasons 	that 	have 	nothing 	to	
do 	with 	a 	hardware 	defect, 	such 	as 	cosmic 	radiation, 	electrostatic 	discharge, 	or	
software	 errors.	Consider	 replacing	 an	FRU	 only	when	 a	problem	 recurs.	If	you	
suspect	 that	an	FRU	 is	defective,	 clear	the	error	 logs	and	run	the	test	 again.	 If	the	
error	does	not	recur,	do	not	replace	the	FRU.	
•	 Be	careful	not	to	replace	a	nondefective	FRU. 
						

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Lenovo YOGA 3 Pro-1370 Hardware Maintenance Manual
What to do first
When  you  do  return  an  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 servicer
2.  Date of service
3.  Date on which the machine failed
4.  Date of purchase
5.  Procedure index and page number in which the failing FRU was detected 
6.  Failing FRU name and part number
7.  Machine type, model number, and serial number
8.  Customer’s name and address
N o t e   f o r   w a r r a n t y :   D u r i n g   t h e   w a r r a n t y   p e r i o d ,   t h e   c u s t o m e r   m a y   b e 
responsible  for  repair  costs  if  the  computer  damage  was  caused  by  misuse, 
accident,  modification,  unsuitable  physical  or  operating  environment,  or 
improper maintenance by the customer.
The  following  is  a  list  of  some  common  items  that  are  not  covered  under 
w a r r a n t y   a n d   s o m e   s y m p t o m s   t h a t   m i g h t   i n d i c a t e   t h a t   t h e   s y s t e m   w a s 
subjected to stress beyond normal use.
Before checking problems with the computer, determine whether the damage is 
covered under the warranty by referring to the following list:
The following are not covered under warranty: 
•  LCD  panel  cracked  from  the  application  of  excessive  force  or  from  being 
dropped
•  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
•  Damage caused by the improper insertion of a PC Card or the installation of 
an incompatible card
•  Improper disk insertion or use of an optical drive 
•  Diskette  drive  damage  caused  by  pressure  on  the  diskette  drive  cover, 
foreign material in the drive, or the insertion of a diskette with multiple labels 
•  Damaged or bent diskette eject button
•  Fuses blown by attachment of a nonsupported device
•  Forgotten computer password (making the computer unusable)
•  Sticky keys caused by spilling a liquid onto the keyboard
•  Use of an incorrect AC adapter on laptop products
The following symptoms might indicate damage caused by nonwarranted 
activities: 
•  Missing parts might be a symptom of unauthorized service or modification. 
•  If the spindle of a hard disk drive becomes noisy, it may have been subjected 
to excessive force, or dropped.  
						

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General checkout 
Power system checkout
To verify a symptom, follow the steps below:
1. Turn off the computer.
2.  Connect the AC adapter.
3.  Make sure that power is supplied when you turn on the computer.
4.  Turn off the computer.
5.  Disconnect the AC adapter.
6.  Make  sure  that  the  battery  pack  supplies  power  when  you  turn  on  the 
computer.
If you suspect a power problem, see the appropriate power supply checkout:
•  “Checking the AC adapter” on page 21
•  “Checking operational charging” on page 21
Checking the AC adapter 
You are here because the computer fails only when the AC adapter is used. 
• If  the  power-on  indicator  does  not  turn  on,  check  the  power  cord  of  the AC 
adapter for correct continuity and installation.
•  I f   t h e   c o m p u t e r   d o e s   n o t   c h a r g e   d u r i n g   o p e r a t i o n ,   g o   t o   “ C h e c k i n g 
operational charging”.
To check the AC adapter, follow the steps below:
1.  Unplug the AC adapter cable from the computer.
2.  Measure  the  output  voltage  at  the  plug  of  the AC  adapter  cable.  See  the 
following figure:
Note: Output voltage for the AC adapter pin No. 2 may differ from the one you 
are servicing.
3. If the voltage is not correct, replace the AC adapter.
4.  If the voltage is acceptable, do the following: 
•  Replace the system board.
•  If the problem persists, go to “Lenovo YOGA 3 Pro-1370” on page 27.
Note: Noise from the AC adapter does not always indicate a defect.
Checking operational charging
To  check  whether  the  battery  charges  properly  during  operation,  use  a 
discharged  battery  pack  or  a  battery  pack  that  has  less  than  50%  of  the  total 
power remaining when installed in the computer.  
						

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Lenovo YOGA 3 Pro-1370 Hardware Maintenance Manual
Perform  operational  charging.  If  the  battery  status  indicator  or  icon  is  not  lit, 
remove  the  battery  pack  and  let  it  return  to  room  temperature.  Reinstall  the 
battery pack. If the charge indicator or icon is still off, replace the battery pack.
If the charge indicator is still not lit, replace the system board.  
						

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Related service information
Related service information
This chapter presents the following information:
• “Restoring the factory contents by using OneKey Recovery” on page 23
•  “Passwords” on page 24
•  “Power management” on page 25
 Restoring the factory contents by using OneKey Recovery
Restore of factory default
The  Lenovo  YOGA  3  Pro-1370  computer  comes  with  pre-installed  OneKey 
Recovery  System.In  order  to  save  application  files  and  the  initial  backed  up 
files  of  the  system,  the  hard  disk  in  a  Lenovo  computer  includes  a  hidden 
partition  when  it  is  shipped.  If  you  need  to  restore  the  system  to  the  point  of 
your first boot up, just enter Lenovo OneKey Recovery System and run  System 
Recovery .  For  details  of  OneKey  Recovery  System,  see  the  User  Guide  for 
Lenovo OneKey Recovery system .
Note:	
This	 will	delete	 all	the	 new	 data	on	the	 system	 partition	 (C	drive),	 which	
is	 not	 recoverable.	 Make	sure	to	back	 up	your	 critical	 data	before	 you	perform	 this	
action. 
						

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Lenovo YOGA 3 Pro-1370 Hardware Maintenance Manual
Passwords
As  many  as  three  passwords  may  be  needed  for  any  Lenovo  computer:  the 
power-on  password  (POP),  the  hard  disk  password  (HDP),  and  the  supervisor 
password.
If  any  of  these  passwords  has  been  set,  a  prompt  for  it  appears  on  the  screen 
whenever  the  computer  is  turned  on.  The  computer  does  not  start  until  the 
password is entered.
Power-on password
A  power-on  password  (POP)  protects  the  system  from  being  powered  on  by 
an  unauthorized  person.  The  password  must  be  entered  before  an  operating 
system can be booted.
Hard-disk password
There are two hard-disk passwords (HDPs):
+ User HDP - for the user
+  Master  HDP  -  for  the  system  administrator,  who  can  use  it  to  get  access  to 
the hard disk drive even if the user has changed the user HDP
Attention:  If  the  user  HDP  has  been  forgotten,  check  whether  a  master  HDP 
has  been  set.  If  it  has,  it  can  be  used  for  access  to  the  hard  disk  drive.  If 
no  master  HDP  is  available,  neither  Lenovo  nor  Lenov  authorized  service 
technicians provide any services to reset either the user or the master HDP, or 
to  recover  data  from  the  hard  disk  drive.  The  hard  disk  drive  can  be  replaced 
for a scheduled fee.
Supervisor password
A supervisor password protects the system information stored in the BIOS. The 
user must enter the supervisor password to get access to the BIOS and change 
the system configuration.
Attention:  If  you  forget  the  password,  there  is  no  service  procedure  to  reset 
the password. The system board must be replaced for a scheduled fee.   
						

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Related service information
Power management
Note:  Power  management  modes  are  not  supported  for  an  APM  operating 
system.
To  reduce  power  consumption,  the  computer  has  two  power  management 
modes: screen blank and sleep (standby).
Screen blank state
If  the  time  set  on  the  “Turn  off  monitor”  timer  in  the  operating  system  expires, 
the  LCD  backlight  turns  off.  You  can  also  turn  off  the  LCD  backlight  by   
pressing 
Fn + ` .
To end screen blank state and resume normal operation, press  Fn + ↑
.
Putting the computer to sleep or shutting it down
When you have finished working with your computer, you can put it to sleep or 
shut it down.
Putting your computer to sleep
If  you  will  be  away  from  your  computer  briefly,  put  the  computer  to  sleep. 
When  the  computer  is  in  sleep  mode,  you  can  quickly  wake  it  to  resume  use, 
bypassing the startup process.
To put the computer to sleep, do one of the following:
•  Close the display lid.
•  Press the Power button.
•  Press  and  hold  or  right-click  the  Start  button  in  the  lower-left  corner  and 
select Shut down  → Sleep.
•  Open the charms and then select  Settings 
 → Power  → Sleep.
Note:   Put  your  computer  to  sleep  before  you  move  it.  Moving  your  computer 
while the hard disk drive is spinning can damage the hard disk, causing loss of 
data.
To wake the computer, do one of the following:
•  Press any key on the keyboard. (Notebook mode only)
•  Press the Power button.
•  Press the Windows button. 
						

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Lenovo YOGA 3 Pro-1370 Hardware Maintenance Manual
Shutting down the computer
If you are not going to use your computer for a long time, shut it down.
To shut down your computer, do one of the following:
• Open the charms bar and select  Settings 
 → Power  → Shut down.
Chapter 2. Starting to use Windo\fs 8.1
19
„
Shutting do\fn the co\bputer
If yo u are  not g oing  t o  use yo ur comp uter for a lo ng ti me, sh ut it  dow n.
To sh ut dow n yo ur comp uter, do o ne of  the follow ing\f
 Ope n t he charms bar a nd selec t Settin gs    → Power    → Shut down .
 \b ight-cl ick  the  Star t b utt on  in  t he lower-lef t cor ner a nd selec t Shut down 
or  sig n out  →  Shut down .
• Right-click  the  Start  button  in  the  lower-left  corner  and  select  Shut  down or 
sign out → Shut down .
Chapter 2. Starting to use Windo\fs 8.1
19
„
Shutting do\fn the co\bputer
If yo u are  not g oing  t o  use yo ur comp uter for a lo ng ti me, sh ut it  dow n.
To sh ut dow n yo ur comp uter, do o ne of  the follow ing\f
 Ope n t he charms bar a nd selec t Settin gs    → Power    → Shut down .
 \b ight-cl ick  the  Star t b utt on  in  t he lower-lef t cor ner a nd selec t Shut down 
or  sig n out  →  Shut down .  
						

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Related service information
• On the Start screen, click       and select  Shut down.
20
Chapter 2. Starting to use Windo\fs 8.1
 On t he  Star t scree n, cl ick   a nd selec t Shut down .
Note\bThis opera tion  depe nds on  your B\fO S se tting s. Please refer  to  the ac tual prod uct.Note: This operation depends on your BIOS settings. Please refer to the actual product.
20
Chapter 2. Starting to use Windo\fs 8.1
 On t he  Star t scree n, cl ick   a nd selec t Shut down .
Note\bThis opera tion  depe nds on  your B\fO S se tting s. Please refer  to  the ac tual prod uct. 
						

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Lenovo YOGA 3 Pro-1370 Hardware Maintenance Manual
Lenovo YOGA 3 Pro-1370
This  chapter  presents  the  following  product-specific  service  references  and 
product-specific parts information:
• “Specifications” on page 26
•  “Status indicators” on page 28
•  “Fn key combinations” on page 29
•  “FRU replacement notices” on page 30
•  “Removing and replacing an FRU” on page 31
•  “Locations” on page 50
•  “Parts list” on page 52
Specifications
The following table lists the specifications of the Lenovo YOGA 3 Pro-1370:
Table 1. Specifications
Feature Description
Processor View  the  system  properties  of  your  computer.You  can  do  this  as 
follows:  Open  the  Control  Panel,  and  then  select  System  and 
Security  → System .
Bus architecture • LP-DDR3 
•  PCI Express bus 
•  DMI 
Graphic Chipset  • Intel BDW GT2
Display • 13.3-inch
Standard 
memory • 
LP-DDR3 (max 8 GB)
CMOS • 256 bytes
SSD • 128 GB, 256 GB, 512 GB
Optical drive  • NA
I/O port  • Combo audio jack × 2 
•  Micro HDMI × 1
•  USB 2.0 port × 1, USB 3.0 port × 2
•  2 in 1 card reader (SD/SDHC/SDXC/MMC)