Lenovo B5400 Service Manual

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Lenovo B5400/M5400/M5400 Touch
1090 Keyboard bezel
For access, remove these FRUs in order:
• “1010 Battery pack” on page 34
• “1020 Base cover” on page 35
• “1040 Optical drive” on page 38
• “1050 Hard disk drive and solid state disk” on page 39
• “1060 PCI Express Mini Card for wireless LAN” on page 42
• “1080 Keyboard” on page 45
Figure 9. Removal steps of keyboard bezel
Remove the screws 1 and 2.











StepScrew (quantity)ColorTorque
1M2.5  ×  5.0  mm,  flat-head,  nylok-coated  (11) BASE to TOPBlack3.0+/-0.3 kgf*cm
2M2.0-0.4 × 2 mm, flat-head, nylok-coated (6)BASE TO TOP (ODD Bridge) & BASE TO TOP (HDD Frame)
Black1.85+/-0.15 kgf*cm 
						

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Lenovo B5400/M5400/M5400 Touch Hardware Maintenance Manual
Figure 9. Removal steps of keyboard bezel (continued)
Disconnect the connectors in the directions shown by arrows 3, 4, and 5. Remove the screws 6.
B5400







 
						

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Lenovo B5400/M5400/M5400 Touch
Figure 9. Removal steps of keyboard bezel (continued)
M5400/M5400 Touch







StepScrew (quantity)ColorTorque
6M2 × 4 mm, flat-head, nylok-coated (4) TOP to MB to BASE & TOP to MBBlack1.85+/-0.15 kgf*cm 
						

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Lenovo B5400/M5400/M5400 Touch Hardware Maintenance Manual
Figure 9. Removal steps of keyboard bezel (continued)
Remove the keyboard bezel in the direction shown by arrow 7.

Remove the screws 8, then remove the finger print module and the power board in the direction shown by arrows 9.




StepScrew (quantity)ColorTorque
8M2 × 3 mm, flat-head, nylok-coated (2)  FP BKT to TOP & Power Board to TOPBlack1.85+/-0.15 kg-cm 
						

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Lenovo B5400/M5400/M5400 Touch
1100 USB board and function board
For access, remove these FRUs in order:
• “1010 Battery pack” on page 34
• “1020 Base cover” on page 35
• “1040 Optical drive” on page 38
• “1050 Hard disk drive and solid state disk” on page 39
• “1060 PCI Express Mini Card for wireless LAN” on page 42
• “1080 Keyboard” on page 45
• “1090 Keyboard bezel” on page 47
Figure 10. Removal steps of USB board and function board
Detach the USB board connector in the direction shown by arrows 1 and 2. Remove the screw 3, then remove the USB board 4.




StepScrew (quantity)ColorTorque
3M2 × 4 mm, flat-head, nylok-coated (1) Audio PCB to BASE Black1.85+/-0.15 kgf*cm 
						

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Lenovo B5400/M5400/M5400 Touch Hardware Maintenance Manual
Figure 10. Removal steps of USB board and function board (continued)
Detach the connectors in the direction shown by arrows 5 and 6. Remove the screws 7, then remove the function board and docking bracket 8.




StepScrew (quantity)ColorTorque
7M2 × 4 mm, flat-head, nylok-coated (2) DCIN PCB to BASE & DCIN BKT to DC IN PCB to BASE
 Black1.85+/-0.15 kgf*cm 
						

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Lenovo B5400/M5400/M5400 Touch
111 0  System board
Important notices for handling the system board:
When	handling	the	system	board,	bear	the	following	in	mind.
•	 Be	careful 	not 	to 	drop 	the 	system 	board 	on 	a 	bench 	top 	that 	has	 a	hard 	surface, 	
such	as	metal,	wood,	or	composite.
•	 Avoid	rough	handling	of	any	kind.
•	 During	the	whole	process,	make	sure	not	to	drop	or	stack	the	system	board.
•	 If	 you	put	a	system	 board	down,	 make	sure	to	put	 it	only	 on	a	padded	 surface	such	
as	an	ESD	mat	or	conductive	corrugated	material.
For access, remove these FRUs in order: 
• “1010 Battery pack” on page 34
• “1020 Base cover” on page 35
• “1040 Optical drive” on page 38
• “1050 Hard disk drive and solid state disk” on page 39
• “1060 PCI Express Mini Card for wireless LAN” on page 42
• “1080 Keyboard” on page 45
• “1090 Keyboard bezel” on page 47
• “1100 USB board and function board” on page 51 
						

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Lenovo B5400/M5400/M5400 Touch Hardware Maintenance Manual
Figure 11. Removal steps of system board (continued)
Disconnect the two connectors in the direction shown by arrows 1. Loosen the screw 2 and remove the screws 3.






StepScrew (quantity)ColorTorque
3M2 × 4 mm, flat-head, nylok-coated (3) MB to BASE & CRT BKT to MB to BASE Black1.85+/-0.15 kgf*cm 
						

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Lenovo B5400/M5400/M5400 Touch
Figure 11. Removal steps of system board (continued)
Remove the system board and the VGA port bracket in the direction shown by arrow 4.
 
						

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Lenovo B5400/M5400/M5400 Touch Hardware Maintenance Manual
1120 Fan assembly and heat sink assembly
For access, remove these FRUs in order: 
• “1010 Battery pack” on page 34
• “1020 Base cover” on page 35
• “1040 Optical drive” on page 38
• “1050 Hard disk drive and solid state disk” on page 39
• “1060 PCI Express Mini Card for wireless LAN” on page 42
• “1080 Keyboard” on page 45
• “1090 Keyboard bezel” on page 47
• “1100 USB board and function board” on page 51
• “1110 System board” on page 53
Figure 12. Removal steps of fan assembly and heat sink assembly
Disconnect the fan connector in the direction shown by arrow 1 and then loosen the screws 2.