Lenovo B5400 Service Manual

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Related service information
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:
• For the Windows 7 operating system: Click Start → Shut down.
• For the Windows 8 operating system:
Move your cursor to the lower-right corner of the screen to open the
charms bar, then select Settings  → Power  → Shut down. 
						

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Lenovo B5400/M5400/M5400 Touch Hardware Maintenance Manual
Lenovo B5400/M5400/M5400 Touch
This chapter presents the following product-specific service references and 
product-specific parts information:
• “Specifications” on page 28
• “Status indicators” on page 30
• “Fn key combinations” on page 31
• “FRU replacement notices” on page 32
• “Removing and replacing an FRU” on page 33
• “Locations” on page 69
• “Parts list” on page 72
Specifications
The  following  table  lists  the  specifications  of  the  Lenovo  B5400/M5400/
M5400 Touch
Table 1. Specifications
FeatureDescription
Processor To view the processor information of your computer, do either of the 
following:
• For the  Windows  7  operating  system:  Click Start,  right-click 
Computer . Then click  Properties.
• For the  Windows  8  operating  system:  From  the  desktop, move  the  cursor  to  the  top-right  or  bottom-right  corner  of  the 
screen to display the charms. Then click  Settings PC info.
Display
• 15.6", 1366 × 768 pixelsStandard 
memory• DDR3L-1600MHz SODIMM x 2 (max 16 GB)
Hard disk drive • 2.5-inch, 7 mm/9.5 mm SA TA• 320 GB / 500 GB / 750 GB / 1TB 5400 rpmOptical drive • 2.5" External 9.5 mm (on select models)I/O port • Combo audio jack × 1 • RJ45 × 1• HDMI port × 1• USB 2.0 port × 1, USB 3.0 port × 2• 4 in 1 slot × 1Audio• 1/8" Combo audio jack• Integrated Speakers Stereo• Internal analog Microphone × 1 (B5400)Ethernet (on the 
system board) • 100/1000M
PCI Express 
Mini Card slot• 2 slots
Bluetooth 
wireless • Combined in combo card 
						

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Lenovo B5400/M5400/M5400 Touch
Table 1. Specifications (continued)
FeatureDescription
Keyboard
•	 6	Row,	Lenovo	KeyboardTouch	pad	•	 Multi-touch	typeIntegrated	camera•	 0.3	MP	 or 	 HD 	 720P	 (B5400)•	 Integrated	720P	(M5400/M5400 	T ouch)Battery•	 6	cell,	2.2	AhAC	adapter•	 20	V,	65	W	or	90	WPre-installed	operating	system	•	 Win7	or	Win8/Win8.1 
						

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Lenovo B5400/M5400/M5400 Touch Hardware Maintenance Manual
Status indicators
The system status indicators below show the computer status:

Table 2. Status indicators
IndicatorMeaning
1Power and battery status indicator
• Green: The battery has a charge between 20% and 100% and the computer is powered on.• Blinking green: The battery has a charge between 20% and 100% and the computer is in sleep or hibernate mode.• Amber: The battery has a charge of 20% or less and the computer is powered on.• Blinking amber: The battery has a charge of 20% or less and the AC power adapter is connected to the computer.• Off: The battery is detached or the computer is powered off.
2Hard disk drive indicatorOn: the hard disk drive is reading or writing data. 
						

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Lenovo B5400/M5400/M5400 Touch
Fn key combinations
The following table describes the functions of Fn key combinations.
Table 3. Function key combinations
Fn+Esc:
• On the Windows 7 operating system: Press Fn+Esc to open the camera and audio settings window. The camera preview is turned on. Change the camera and audio settings as desired.• On the Windows 8 operating system: Press Fn+Esc to enable or disable the camera.
Fn+F1:Enters sleep mode.
Fn+F2:Turns on/off the backlight of the LCD screen.
Fn+F3:Opens the display device switch interface. Select this notebook or an external display.
Fn+F5:Enables/Disables wireless devices.
Fn+F6:Enables/Disables the touchpad and touchpad buttons.
Fn+F9:Starts/Pauses playback of Windows Media Player.
Fn+F10:Stops playback of Windows Media Player.
Fn+F11:Skips to the previous track.
Fn+F12:Skips to the next track.
Fn+PrtSc:Activates the system request.
Fn+Insert:Enables/Disables the scroll lock.
Fn+Home:Activates the pause function.
Fn+End:Activates the break function.
Fn+ ↑ / ↓:Increases/Decreases display brightness.
Fn+ → / ←:Increases/Decreases sound volume. 
						

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Lenovo B5400/M5400/M5400 Touch Hardware Maintenance Manual
FRU replacement notices
This section presents notices related to removing and replacing parts. Read this section carefully before replacing any FRU.
Screw notices 
Loose screws can cause a reliability problem. In the Lenovo computer, this problem is addressed with special nylon-coated screws that have the following characteristics:
• They maintain tight connections.
• They do not easily come loose, even with shock or vibration.
• They are harder to tighten.
• Each one should be used only once.
Do the following when you service this machine: 
• Keep the screw kit in your tool bag.
• Carefully remove screws for reuse when replacing FRUs.
• Use a torque screwdriver if you have one.
Tighten screws as follows:
• Plastic to plastic
 Turn an additional 90° after the screw head touches the surface of the plastic part:more than 90°
(Cross-section)
• Logic card to plastic 
 Turn an additional 180° after the screw head touches the surface of the logic card: more than 180°
(Cross-section)
• Torque driver 
 If you have a torque screwdriver , refer to the “Torque” column for each step.
• Make sure that you use the correct screws. If you have a torque screwdri\
ver, tighten  all  screws  firmly  to  the  torque  shown  in  the  table. Carefully remove screws for reuse when replacing FRUs. Make sure that all screws are tightened firmly.
• Ensure torque screwdrivers are calibrated correctly following country specifications. 
						

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Lenovo B5400/M5400/M5400 Touch
Removing and replacing an FRU
This  section  presents  exploded  figures  with  the  instructions  to  indicate  how  to remove and replace the FRU. Make sure to observe the following general rules:
1. Do not attempt to service any computer unless you have been trained and certified. An untrained person runs the risk of damaging parts.
2. Before replacing any FRU, review “FRU replacement notices” on page 32.
3. Begin by removing any FRUs that have to be removed before the failing FRU. Any of such FRUs are listed at the top of the page. Remove them in the order in which they are listed.
4.  Follow the correct sequence in the steps to remove the FRU, as given in the figures by the numbers in square callouts.
5. When turning a screw to replace an FRU, turn it in the direction as given by the arrow in the figure.
6. When removing the FRU, move it in the direction as given by the arrow in the figure.
7. To put the new FRU in place, reverse the removal procedures and follow any of the notes that pertain to replacement. For information about connecting and arranging internal cables, see “Locations” on page 69.
8.  When replacing an FRU, use the correct screw as shown in the procedures.
 DANGER
Before	 removing	 any	FRU,	 turn	off	the	 computer,	 unplug	all	power	 cords	from	
electrical	 outlets,	remove	the	battery	 pack,	and	then	 disconnect	 any	of	the 	
interconnecting	cables.
Attention:  After replacing an FRU, do not turn on the computer until you have made sure 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 circuits.
Attention: The system board is sensitive to, and can be damaged by, electrostatic discharge. Before touching it, establish personal grounding by touching a ground point with one hand or using an electrostatic discharge (ESD) strap (P/N 6405959) to remove potential shock reasons. 
						

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Lenovo B5400/M5400/M5400 Touch Hardware Maintenance Manual
1010 Battery pack
 DANGER
Only	use	the	battery	 specified	 in	the	 parts	 list	for	your	 computer.	 Any	other	 battery	
could	ignite	or	explode.	
Figure 1. Removal steps of battery pack
Unlock the manual battery latch 1. Holding the spring-loaded battery latch in the unlocked position 2, remove the battery pack in the direction shown by the arrow 3.



When installing: Install the battery pack along the slide rails of the slot. Then make sure that the battery release lever is in the locked position. 
						

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Lenovo B5400/M5400/M5400 Touch
1020 Base cover
For access, remove this FRU:
• “1010 Battery pack” on page 34
Figure 2. Removal steps of base cover
Remove the screws 1. Then remove the base cover 2.



StepScrew (quantity)ColorTorque
1M2 × 4 mm, flat-head, nylok-coated (2) Door to BASEBlack1.85+/-0.15 kgf*cm 
						

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Lenovo B5400/M5400/M5400 Touch Hardware Maintenance Manual
Note: Applying labels to the base cover
The new base cover FRU is shipped with a kit containing labels of several 
kinds. When you replace the base cover, you need to apply the following 
labels: 
The following labels need to be peeled off from the old base cover and put on 
the new base cover. 
a Barcode label
b KCC label
c Indonesia D side label
d Rating label
e GML label
f COA labelg BT label
h WL label
For some models, you also need to apply one or two FCC labels. Check the 
old base cover; if it has one or two FCC labels, find duplicates of them in the 
label kit and apply them to the new base cover. 
For the location of each label, refer to the following figure:
 
12
a
d
ef
hg
bc