Service Manuals, User Guides, Schematic Diagrams or docs for : NOKIA Mobile Phone Nokia_8910_8910i 09-nhm4-trouble
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Disassembly and Troubleshooting Instructions CCS Technical Documentation
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NHM-4 Disassembly Instructions.................................................................................. 5
Phone disassembly steps ..............................................................................................5
Reassembly ................................................................................................................19
Bluetooth module removal and reassembly ...............................................................20
Transceiver Troubleshooting ....................................................................................... 25
Test points ..................................................................................................................25
SIM test points ........................................................................................................ 25
Bluetooth test points................................................................................................ 26
Power test points ..................................................................................................... 28
LCD, RF and Flash test points ................................................................................ 29
Miscellaneous test points ........................................................................................ 31
Flash programming and RF power supply test points............................................. 32
Troubleshooting steps .................................................................................................. 35
Main troubleshooting tree, 1 ......................................................................................36
Main troubleshooting tree, 2 ......................................................................................37
Main troubleshooting tree, 3 ......................................................................................38
Keypad troubleshooting 2 ..........................................................................................55
RF Troubleshooting ..................................................................................................... 59
Introduction ................................................................................................................59
Transmitter .................................................................................................................59
Transmitter troubleshooting diagram ...................................................................... 61
Hagar troubleshooting ............................................................................................. 62
PA & Antenna switch troubleshooting.................................................................... 63
Transmitter signals .................................................................................................. 64
Receiver................................................................................................................... 65
Receiver troubleshooting diagram for GSM900 ..................................................... 67
Receiver troubleshooting diagram for GSM1800 ................................................... 68
LNA gangster checking GSM900 & GSM1800 ..................................................... 69
Synthesizer .............................................................................................................. 70
Synthesizer troubleshooting diagram ...................................................................... 71
Synthesizer signals .................................................................................................. 72
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NHM-4
CCS Technical Documentation
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 -
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
3
2
5 6
4
1
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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
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The desoldering profile is a BT. When the peak step ends, lift the heating head
up.
Figure 47: Desoldering profile
Pick up the component with tweezers.
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Figure 48: BT module is desoldered
The soldering pads are shown below.
Figure 49: Soldering pads
The BT module is destroyed during desoldering. It must not be reused or
reworked!
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Figure 50: Removed and new BT module
Remove old solder from the pads with solder wick.
Figure 51: Removing old solder
Place a new BT module on the circuit board
Figure 52: Placing new BT module
Make sure that it is positioned correctly.
Apply flux.
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Figure 53: Flux application
Solder the connections pad by pad using a soldering iron with a manywave tip
or equal, but NOT with a rework station.
Figure 54: Soldering
Make sure that there are no solder bridges between the pads and the module
shield!
Figure 55: Soldered BT module
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Main troubleshooting tree, 1 )LJXUH
TOP
Phone totally Yes Phone is
dead dead
No
Flash programming Yes Phone is
Phone
doesn't work jammed
No
Phone doesn't Yes
start up or the phone is Flash
jammed faults
No
Charging Yes
Charger
doesn't work
No
TOP 2
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TOP 2
Phone doesn't read Yes
SIM card
SIM card
No
Yes Audio
Audio faults
faults
No
Display or LED's Yes Display
doesn't work faults
No
Keypad Yes Keypad
doesn't work faults
No
TOP 3
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Bluetooth
connwction does Yes BT
not work faults
No
Grio open/
close does not Yes Grip
work electrically switch
faults
No
END
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Phone is dead
)LJXUH
Phone is
dead
Yes Check X101
Phone current
solder and
is zero ?
VBATT lines
PWR filter
components
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