Lenovo B5400 Service Manual

							Lenovo B5400/M5400/
M5400 Touch
Hardware 
Maintenance 
Manual 
						

							Notes:
•	Before	using	this	information	and	the	product	it	supports,	be	sure	to	read	the	general	information	under	“Notices”	on	page	92.
•	This	manual	applies	to	the	following	models:	Lenovo	B5400/M5400/M5400	Touch.	The	illustrations	used	in	this	manual	are	for	Lenovo	M5400	unless	otherwise	stated.
First Edition (Jul. 2013)
© Copyright Lenovo 2013. All rights reserved.
LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is delivered pursuant a General Services Administration “GSA” contract, use, reproduction, or disclosure is subject to restrictions set forth in Contract No. GS-35F-05925.
© 2013 Lenovo 
						

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Contents
About this manual .......................................iv
Safety information ........................................1General safety ................................................2Electrical safety ..............................................3Safety inspection guide  ..................................5Handling devices that are sensitive to electrostatic discharge ....................................6Grounding requirements .................................6Safety notices: multilingual translations..........7Laser compliance statement.........................14
Important service information ...................16Strategy for replacing FRUs .........................16Strategy for replacing a hard disk drive ............17Important notice for replacing a  system board  ...................................................17Important information about replacing  RoHS compliant FRUs .................................18
General checkout  ......................................19What to do first .............................................20Power system checkout................................21Checking the AC adapter  .................................21Checking operational charging .........................21Checking the battery pack ................................22
Related service information ......................23Restoring the factory contents by using  OneKey Recovery ........................................23Restore of factory default .................................23Passwords ....................................................25Power-on password ..........................................25Hard-disk password  ..........................................25Supervisor password ........................................25Power management .....................................26Screen blank state ............................................26Putting the computer to sleep or shutting  it down ..............................................................26Putting your computer to sleep .........................26Shutting down the computer .............................27
Lenovo B5400/M5400/M5400 Touch ..........28Specifications ...............................................28Status indicators ...........................................30Fn key combinations.....................................31FRU replacement notices .............................32Screw notices  ..................................................32Removing and replacing an FRU .................331010 Battery pack .............................................341020 Base cover ...............................................351030 Backup battery .........................................371040 Optical drive .............................................38
1050 Hard disk drive and solid  state disk...........................................................391060 PCI Express Mini Card for  wireless LAN .....................................................421070 DIMM  .......................................................441080 Keyboard .................................................451090 Keyboard bezel .........................................471100 USB board and function board.................51111 0  System board  ............................................531120 Fan assembly and heat  sink assembly ...................................................561130 CPU .........................................................581140 LCD unit ...................................................591150 LCD front bezel (B5400/M5400) ..............611160 LCD panel, LCD cable, antenna  assembly, and hinges (B5400/M5400) .............631170 LCD module, LCD cable, and  hinges (M5400 Touch) ......................................661180 Integrated camera ....................................68Locations ......................................................69Front view and right-side view ..........................69Bottom and Left-side view  ...............................71Parts list ........................................................72Overall ..............................................................73LCD FRUs ........................................................77Keyboard ..........................................................81Miscellaneous parts ..........................................85Screws ..............................................................85AC adapters ......................................................86Power cords ......................................................87
Notices.........................................................92Trademarks ..................................................93 
						

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About this manual
This manual contains service and reference information for the following\
 Lenovo product:
Lenovo B5400/M5400/M5400 Touch
Use this manual to troubleshoot problems.
The manual is divided into the following sections:
• The common sections provide general information, guidelines, and safety information required for servicing computers.
• The product-specific section includes service, reference, and product-specific parts information.
Important:
This	manual	 is	intended	 only	for	trained	 servicers	 who	are	familiar	 with	Lenovo 	
products.	Use	this	manual	to	troubleshoot	problems	effectively.
Before	 servicing	 a	Lenovo	 product,	 make	sure	to	read	 all	the	 information	 under	
“Safety	information”	on	page	1 	and	“Important	service	information”	on	page	16 .	 
						

							1
Safety information
Safety information
This chapter presents the following safety information that you need to get familiar with before you service a Lenovo B5400/M5400/M5400 Touch computer:
• “General safety” on page 2
• “Electrical safety” on page 3
• “Safety inspection guide” on page 5
• “Handling devices that are sensitive to electrostatic discharge” o\
n page 6
• “Grounding requirements” on page 6
• “Safety notices: multilingual translations” on page 7
• “Laser compliance statement” on page 14 
						

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Lenovo B5400/M5400/M5400 Touch Hardware Maintenance Manual
General safety
Follow these rules below to ensure general safety:
• Observe a good housekeeping in the area where the machines are put during and after the maintenance.
• When lifting any heavy object: 
1. Make sure that you can stand safely without slipping.
2. Distribute the weight of the object equally between your feet.
3. Use a slow lifting force. Never move suddenly or twist when you attempt to lift it.
4. Lift it by standing or pushing up with your leg muscles; this action could avoid the strain from the muscles in your back. Do not attempt to lift a\
ny object that weighs more than 16 kg (35 lb) or that you think is too heavy for you.
• Do not perform any action that causes hazards to the customer, or that makes the machine unsafe.
• Before you start the machine, make sure that other service representatives and the customer are not in a hazardous position.
• Please remove covers and other parts in a safe place, away from all personnel, while you are servicing the machine.
• Keep your toolcase away from walk areas so that other people will not trip over it.
• Do not wear loose clothing that can be trapped in the moving parts of the machine. Make sure that your sleeves are fastened or rolled up above your elbows. If your hair is long, fasten it.
• Insert the ends of your necktie or scarf inside clothing or fasten it with the nonconductive 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 may be hazardous to your eyes.
• After service, reinstall all safety shields, guards, labels, and ground \
wires. Replace any safety device that is worn or defective.
• Reinstall all covers correctly before returning the machine to the custo\
mer.
• Fan louvers on the machine help to prevent the overheating of internal components. Do not obstruct fan louvers or cover them with labels or stickers. 
						

							3
Safety information
Electrical safety
Observe the following rules when working on electrical equipments.
Important:
Use	only	 approved	 tools	and	test	equipments.	 Some	hand	tools	 have	handles 	
covered	 with	a	soft	 material	 that	does	 not	insulate	 you	when	 working	 with	live	
electrical	currents.
Many	 customers	 have	rubber	 floor	mats	near	their	 machines	 that	contain	 small	
conductive	 fibers	to	decrease	 electrostatic	 discharges.	Do	not	 use	 such	 kind	of	mat 	
to	protect	yourself	from	electrical	shock.	
• Find the room emergency power-off (EPO) switch, disconnecting switch or electrical outlet. If an electrical accident occurs, you can then operat\
e the switch or unplug the power cord quickly. 
• Do not work alone under hazardous conditions or near the equipment that has hazardous voltages.
• Disconnect all power before:
–  Performing a mechanical inspection
– Working near power supplies
– Removing or installing main units
• Before you start to work on the machine, unplug the power cord. If you cannot unplug it, ask the customer to power-off the wall box that supplies power to the machine, and to lock the wall box in the off position.
• If you need to work on a machine that has exposed electrical circuits, observe the following precautions:
– Ensure that another person, familiar with the power-off controls, is near you.
 Attention: Another person must be there to switch off the power, if necessary. 
– Use only one hand when working with powered-on electrical equipment; keep the other hand in your pocket or behind your back. 
 Attention: An electrical shock can occur only when there is a complete circuit. By observing the above rule, you may prevent a current from passing through your body. 
–  When using testers, set the controls correctly and use the approved 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 are in the safety sections of maintenance information. Be extremely careful when you measure the  high voltages.
• Regularly inspect and maintain your electrical hand tools for safe operational condition. 
• Do not use worn or broken tools and testers.
• Never assume that power has been disconnected from a circuit. First, check it to make sure that it has been powered off.  
						

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Lenovo B5400/M5400/M5400 Touch Hardware Maintenance Manual
• Always look carefully for possible hazards in your work area. Examples of these hazards are moist floors, nongrounded 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 removed from their normal operating places in a machine: 
– Power supply units
– Pumps
– Blowers and fans
– Motor generators
and similar units. (This practice ensures correct grounding of the unit\
s.)
• If an electrical accident occurs:
– Caution: do not become a victim yourself.
– Switch off the power.
– Send the victim to get medical aid. 
						

							5
Safety information
Safety inspection guide
The purpose of this inspection guide is to assist you in identifying pot\
ential unsafe conditions. As each machine was designed and built, required safety items were installed to protect users and service personnel from injury. This guide addresses only those items. You should use good judgment to identify potential safety hazards according to the attachment of non-Lenovo features or options not covered by this inspection guide.
If any unsafe conditions are present, you must determine how serious the apparent hazard could be and whether you can continue without first correcting the problem. 
Consider these conditions and the safety hazards they present: 
• Electrical hazards, especially primary power (primary voltage on the frame can cause serious or fatal electrical shock) 
• Explosive hazards, such as a damaged CRT face or a bulging capacitor
• Mechanical hazards, such as loose or missing hardware
To determine whether there are any potential unsafe conditions, use the following checklist at the beginning of every service task. Begin the checks with the power off, and the power cord disconnected.
Checklist:
1. Check exterior covers for damage (loose, broken, or sharp edges).
2. Turn off the computer. Disconnect the power cord.
3. Check the power cord for:
a. A third-wire ground connector in good condition. Use a meter to measure third-wire ground continuity for 0.1 ohm or less between the external ground pin and the frame ground.
b.  The power cord should be the type specified in the parts list.
c. Insulation must not be frayed or worn.
4. Check for cracked or bulging batteries.
5. Remove the cover.
6. Check for any obvious non-Lenovo alterations. Use good judgment as to th\
e safety of any non-Lenovo alterations.
7.  Check inside the unit for any obvious unsafe conditions, such as metal filings, contamination, water or other liquids, or signs of fire or smoke damage.
8.  Check for worn, frayed, or pinched cables.
9. Check that the power-supply cover fasteners (screws or rivets) have no\
t been removed or tampered with. 
						

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Lenovo B5400/M5400/M5400 Touch Hardware Maintenance Manual
Handling devices that are sensitive to electrostatic discharge
Any computer part containing transistors or integrated circuits (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	that	the	ESD	 protective	 devices	you	use	have	 been	certified	 (ISO	
9000)	as	fully	effective.
When handling ESD-sensitive parts:
• Keep the parts in protective packages until they are inserted into the p\
roduct. 
• Avoid contact with other people.
• Wear a grounded wrist strap against your skin to eliminate static on your body.
• Prevent the part from touching your clothing. Most clothing is insulative and retains a charge even when you are wearing a wrist strap.
• Use the black side of a grounded work mat to provide a static-free work surface. The mat is especially useful when handling ESD-sensitive devices.
• Select a grounding system, such as those listed below, to provide protection that meets the specific 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-operated system, use an ESD common ground or reference point. You can use coax or connector-outside shells on these systems.
– Use the round ground prong of the ac plug on ac-operated computers.
Grounding requirements
Electrical grounding of the computer is required for operator safety and correct system  function.  Proper  grounding  of  the  electrical  outlet  can  be  verified  by  a certified electrician.