Lenovo Yoga 2 Service Manual

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Important service information
Use the following strategy to prevent unnecessary expense for replacing and servicing FRUs:
• If you are instructed to replace an FRU, but the replacement does not solve the problem, reinstall the original FRU before you continue.
• Some computers have both a processor board and a system board. If you are instructed to replace either of them, and replacing one of them does not solve the problem, reinstall that board, and then replace the other one.\
 
• If an adapter or a device consists of more than one FRU, any of the FRUs may be the cause of the error. Before replacing the adapter or device, remove the FRUs one by one to see if the symptoms change. Replace only the FRU that changed the symptoms. 
Attention: The setup configuration on the computer you are servicing may have been customized. Running Automatic Configuration may alter the settings.  Note  the  current  configuration  settings  (using  the  View  Configuration option);  then,  when  service  has  been  completed,  verify  that  those  settings remain in effect.
Strategy for replacing a hard disk drive
Always try to run a low-level format before replacing a hard disk drive.\
 This will cause all customer data on the hard disk to be lost. Make sure that the customer has a current backup of the data before performing this action.\
Attention: The drive startup sequence in the computer you are servicing may have been changed. Be extremely careful during write operations such as copying, saving, or formatting. If you select an incorrect drive, data or programs can be overwritten.
Important notice for replacing a system board 
Some components mounted on a system board are very sensitive. Improper handling can cause damage to those components, and may cause a system malfunction.
Attention:  When handling a system board:
• Do not drop the system board or apply any excessive force to it.
• Avoid rough handling of any kind.
• Avoid bending the system board and hard pushing to prevent cracking at each BGA (Ball Grid Array) chipset. 
						

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Lenovo Yoga 2 Pro (13″) Hardware Maintenance Manual
Important information about replacing RoHS compliant FRUs
RoHS, The Restriction of Hazardous Substances in Electrical and Electronic Equipment Directive (2002/95/EC) is a European Union legal requirement affecting the global electronics industry. RoHS requirements must be implemented on Lenovo products placed on the market after June 2006. Products on the market before June 2006 are not required to have RoHS compliant parts. If the original FRU parts are non-compliant, replacement parts can also be non-compliant. In all cases if the original FRU parts are RoHS compliant, the replacement part must also be RoHS compliant.
Note:  RoHS  and  non-RoHS  FRU  part  numbers  with  the  same  fit  and  function are identified with unique FRU part numbers.
Lenovo plans to transit to RoHS compliance well before the implementation date and expects its suppliers to be ready to support Lenovo’s requirements and schedule in the EU. Products sold in 2005 and 2006 will contain some RoHS compliant FRUs. The following statement pertains to these products and any product Lenovo produces containing RoHS compliant FRUs.
RoHS compliant FRUs have unique FRU part numbers. Before or after the RoHS implementation date, failed RoHS compliant parts must always be replaced  with  RoHS  compliant  ones,  so  only  the  FRUs  identified  as  compliant in the system HMM or direct substitutions for those FRUs may be used. 
Products marketed before June 2006Products marketed after June 2006 
Current or original part Replacement FRU Current or original part Replacement FRU
Non-RoHSCan be Non-RoHS
Must be RoHSMust be RoHSNon-RoHSCan be RoHS
Non-RoHSCan sub to RoHS
RoHSMust be RoHS
Note: A direct substitution is a part with a different FRU part number that is automatically shipped by the distribution center at the time of the orde\
r. 
						

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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 2 Pro (13″) 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
Note for warranty: During the warranty period, the customer may be 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 warranty and some symptoms that might indicate that the system was 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 multi\
ple 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 checkou\
t:
• “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.
• If the computer does not charge during operation, go to “Checking 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:


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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 2 Pro (13″)” 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 2 Pro (13″) 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  2  Pro  (13″)  computer  comes  with  pre-installed  OneKey Recovery System.In order to save application files and the initial backe\
d 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 2 Pro (13″) 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 .
To end screen blank state and resume normal operation, press .
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 for only a short time, put the co\
mputer 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:
• Close the display panel.
• Press the Power button.
• Move your cursor to the lower-right corner of the screen to open the charms 
bar, then select Settings  → Power  → Sleep.
• Right-click the Windows icon  on the desktop lower-left corner. Then 
select Sleep from the Shut down menu options.
Attention: Wait until the power indicator light starts blinking (indicating that the  computer  is  in  sleep  mode)  before  you  move  your  computer.  Moving  your computer while the hard disk is spinning can damage the hard disk, causi\
ng loss of data.
To wake the computer, do one of the following:
• Press any key on the keyboard.
• Press the Power button. 
						

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Lenovo Yoga 2 Pro (13″) 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:
• Open the charms, then select Settings  → Power  → Shut down.
• Right-click the Windows icon  on the desktop lower-left corner. Then 
select Shut down from the Shut down menu options.