Nokia NHM-4 Series Installation instructions

&XVWRPHU&DUH6ROXWLRQV
1+06HULHV7UDQVFHLYHUV
,VVXH &RS\ULJKW È1RNLD$OOULJKWVUHVHUYHG
'LVDVVHPEO\DQG7URXEOHVKRRWLQJ
,QVWUXFWLRQV

1+0
'LVDVVHPEO\DQG7URXEOHVKRRWLQJ,QVWUXFWLRQV &&67HFKQLFDO'RFXPHQWDWLRQ
3DJH &RS\ULJKWÈ1RNLD$OOULJKWVUHVHUYHG ,VVXH
>7KLVSDJHOHIWLQWHQWLRQDOO\ ODQN@

,VVXH 3DJH
1+0'LVDVVHPEO\,QVWUXFWLRQV
3KRQHGLVDVVHPEO\VWHSV
5HDVVHPEO\ 
OXHWRRWKPRGXOHUHPRYDODQGUHDVVHPEO\
7UDQVFHLYHU7URXEOHVKRRWLQJ 
7HVWSRLQWV
6,0WHVWSRLQWV 
OXHWRRWKWHVWSRLQWV
3RZHUWHVWSRLQWV 
/&'5)DQG)ODVKWHVWSRLQWV 
0LVFHOODQHRXVWHVWSRLQWV 
)ODVKSURJUDPPLQJDQG5)SRZHUVXSSO\WHVWSRLQWV
7URXEOHVKRRWLQJVWHSV 
0DLQWURXEOHVKRRWLQJWUHH
0DLQWURXEOHVKRRWLQJWUHH
0DLQWURXEOHVKRRWLQJWUHH
.H\SDGWURXEOHVKRRWLQJ
5)7URXEOHVKRRWLQJ 
,QWURGXFWLRQ
7UDQVPLWWHU
7UDQVPLWWHUWURXEOHVKRRWLQJGLDJUDP 
+DJDUWURXEOHVKRRWLQJ 
3$$QWHQQDVZLWFKWURXEOHVKRRWLQJ
7UDQVPLWWHUVLJQDOV 
5HFHLYHU
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NHM-4 Disassembly Instructions
Phone disassembly steps
Take ESD precautions!
Figure 1: Anti-ESD strap donned
Open the phone slide.
Figure 2: Slide opening
Remove the battery cover: open it.
Figure 3: Battery cover latch pressed

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Lift up the battery cover
Figure 4: Battery cover lifted up
Remove the battery cover.
Figure 5: Battery cover removal
Remove the battery.
Figure 6: Battery removal

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Remove the logo plate: Push the grip downwards at the logo plate -
Figure 7: Grip pressed down
- and at the same time push the logo plate off.
Figure 8: Logo plate removal
Remove the antenna: open the locking.
Figure 9: Antenna locking opened

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Lift off the antenna.
Figure 10: Antenna removal 2
Open the two limiter screws
Figure 11: Limiter screws opened
Lift up the limiter from the two screw towers.
Figure 12: Limiter lifted up

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The limiter shown here:
Figure 13: Limiter shown
Push the limiter backwards and up.
Figure 14: Limiter moving
Limiter seen from another angle
Figure 15: Limiter view

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Open the flex connector: push a tool under the flex connector from the short
side corner of the connector - never touching the flex, but the connector only-
Figure 16: A tool pushed under the flex connector
- and twist
Figure 17: Flex connector opening
Lift the connector up carefully
Figure 18: Flex connector opened

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The flex connector opening in practice: insert tool -
Figure 19: Flex connector opening 1
- twist
Figure 20: Flex connector opening 2
- and lift up carefully
Figure 21: Flex connector opened

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Lift the torsion spring from its slot.
Figure 22: Torsion spring lifted from slot
The spring is lifted.
Figure 23: Torsion spring lifted
Pull the engine module carefully from the grip.
Figure 24: Engine module pulling from the grip

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Note: avoid bending the limiter when pulling out the engine module.
Figure 25: Engine module removed from the grip
Remove the limiter.
Figure 26: Limiter removed
Remove the four screws holding the engine with the A-cover.
Figure 27: Preparing to remove four screws

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Open the screws.
Figure 28: Opening screws
The four screws are removed, note holes
Figure 29: Screws removed
Lift the engine assembly from the A- cover
Figure 30: Engine removed

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Removed the LCD. Open the board-to-board connector, first on one side -
Figure 31: B-to-b connector opened from one side
- and then from the other side.
Figure 32: B-to-b connector opened from the other side

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Open the locking to the shield by pressing the locking clip with a flat screw-
driver.
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LCD removed.
Figure 34: LCD removed
Remove the system module LA4 off the shield.
Figure 35: LA 4 module removal from the shield.

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Remove the keyboard assembly from the A-cover.
Figure 36: Keyboard assembly removal
Remove the keymat.
Figure 37: Keymat removal 1
Figure 38: Keymat removal 2

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Remove the User Interface board from the frame.
Figure 39: UI board removal
Remove the speaker from the A-cover.
Figure 40: Speaker removal
Remove the buzzer from the A-cover.
Figure 41: Buzzer removal

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Assembly parts of NHM-4 phone:
Figure 42: Assembly parts
Reassembly
Reassembly of the phone is carried out in reverse order to disassembly.
The screws cannot be re-used.
The screwdriver tip type is Torx T6+ and the torque force is 17ncm
The order of tightening the screws is described below:
Figure 43: Order of tightening screws
2
3
56
14

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Bluetooth module removal and reassembly
Take anti-ESD precautions!
Figure 44: anti-ESD wrist strap donned
Preparing to remove the defective BT module from the circuit board.
Use a rework station for CPS components.
Figure 45: Module in soldering jig
Desoldering nozzle size is 28 x 15 mm.
Figure 46: 28x15 mm nozzle