Lenovo B40-30 Laptop Hardware Maintenance Manual - Lenovo B40-xx Notebook - Page 53

Removal, steps, system, board, continued, 0~2.5kgf.cm

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Lenovo B40-30/B40-45/B40-70 Figure 11. Removal steps of system board (continued) Disconnect the USB board connector in the direction shown by arrow b . Then disconnect the EDP connector in the direction shown by arrow c . 3 2 Remove the screw d . Pull the DC‐IN connect from its cavity in the direction by arrow e . Then remove the system board in the direction by arrow f . 5 4 6 Step Screw (quantity) Color Torque d 7 M2.5 x 4 mm, flat‐head, nylok‐coated (1) Black 2.0~2.5kgf.cm When installing: • Make sure USB, HDMI, and the VGA of the system board attached into its holes on the base properly. Improper placement of the jacks may cause damage. • Make sure that the connectors are attached firmly to the system board. 49

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Lenovo B40-30/B40-45/B40-70
49
Figure
 
11.
 
Removal
 
steps
 
of
 
system
 
board
 
(continued)
Disconnect
 
the
 
USB
 
board
 
connector
 
in
 
the
 
direction
 
shown
 
by
 
arrow
 
.
 
Then
 
disconnect
 
the
 
EDP
 
connector
 
in
 
the
 
direction
 
shown
 
by
 
arrow
 
.
Remove
 
the
 
screw
 
 
Pull
 
the
 
DC
‐
IN
 
connect
 
from
 
its
 
cavity
 
in
 
the
 
direction
 
by
 
arrow
 
.
 
Then
 
remove
 
the
 
system
 
board
 
in
 
the
 
direction
 
by
 
arrow
 
.
 
When installing:
 
•
Make
 
sure
 
USB,
 
HDMI,
 
and
 
the
 
VGA
 
of
 
the
 
system
 
board
 
attached
 
into
 
its
 
holes
 
on
 
the
 
base
 
properly.
 
Improper
 
placement
 
of
 
the
 
jacks
 
may
 
cause
 
damage.
•
Make
 
sure
 
that
 
the
 
connectors
 
are
 
attached
 
firmly
 
to
 
the
 
system
 
board.
Step
Screw (quantity)
Color
Torque
M2.5
 
x
 
4
 
mm,
 
flat
‐
head,
 
nylok
‐
coated
 
(1)
 
Black
2.0~2.5kgf.cm
b
c
2
3
d
e
f
4
5
6
d