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Nokia NHM-4 Series, Assembly, Disassembly And Troubleshooting Instructions, Page: 5 / 74

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Nokia NHM-4 Series Assembly, Disassembly And Troubleshooting Instructions Download Page 5

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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 

Summary of Contents for NHM-4 Series

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Page 5: ...NLD RUSRUDWLRQ 3DJH 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 ...

Page 6: ...HFKQLFDO RFXPHQWDWLRQ 3DJH È1RNLD RUSRUDWLRQ VVXH 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 ...

Page 7: ...SRUDWLRQ 3DJH 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 ...

Page 8: ...PHQWDWLRQ 3DJH È1RNLD RUSRUDWLRQ VVXH 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 ...

Page 9: ...LFDO RFXPHQWDWLRQ 1 0 VVXH È1RNLD RUSRUDWLRQ 3DJH 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 ...

Page 10: ...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 ...

Page 11: ...QWDWLRQ 1 0 VVXH È1RNLD RUSRUDWLRQ 3DJH 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 ...

Page 12: ... RUSRUDWLRQ VVXH 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 ...

Page 13: ... 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 ...

Page 14: ...DO RFXPHQWDWLRQ 3DJH È1RNLD RUSRUDWLRQ VVXH 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 ...

Page 15: ... 0 VVXH È1RNLD RUSRUDWLRQ 3DJH 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 ...

Page 16: ...USRUDWLRQ VVXH Open the locking to the shield by pressing the locking clip with a flat screw driver LJXUH RFNLQJ RSHQLQJ LCD removed Figure 34 LCD removed Remove the system module LA4 off the shield Figure 35 LA 4 module removal from the shield ...

Page 17: ...FKQLFDO RFXPHQWDWLRQ 1 0 VVXH È1RNLD RUSRUDWLRQ 3DJH 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 ...

Page 18: ...LRQ 3DJH È1RNLD RUSRUDWLRQ VVXH 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 ...

Page 19: ...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 5 6 1 4 ...

Page 20: ...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 ...

Page 21: ...6 7HFKQLFDO RFXPHQWDWLRQ 1 0 VVXH È1RNLD RUSRUDWLRQ 3DJH 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 ...

Page 22: ...O RFXPHQWDWLRQ 3DJH È1RNLD RUSRUDWLRQ VVXH 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 ...

Page 23: ...LRQ 3DJH 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 ...

Page 24: ...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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Page 36: ...OHVKRRWLQJ WUHH LJXUH Main troubleshooting tree 1 TOP Phone totally dead Phone is dead Yes Phone doesn t start up or the phone is jammed Phone is jammed Yes Flash programming doesn t work Phone Flash Yes No No Charging doesn t work No Charger Yes TOP 2 No jammed faults ...

Page 37: ...È1RNLD RUSRUDWLRQ 3DJH 0DLQ WURXEOHVKRRWLQJ WUHH LJXUH TOP 2 Phone doesn t read SIM card SIM card Yes Audio faults No Audio faults Yes Display or LED s doesn t work No Display faults Yes Keypad doesn t work No Keypad faults Yes No TOP 3 ...

Page 38: ...KQLFDO RFXPHQWDWLRQ 3DJH È1RNLD RUSRUDWLRQ VVXH 0DLQ WURXEOHVKRRWLQJ WUHH LJXUH TOP 3 connwction does not work faults Yes work electrically No Grip faults Yes No Bluetooth BT switch Grio open close does not END ...

Page 39: ... No Is phone flash programing OK Yes Phone current is No Is phone in LOCAL MODE Yes OK retest Yes Check BSI line X101 C104 C240 R202 R206 Are these No No Check X101 solder and VBATT lines Yes Phone is Yes Repair No Phone is jammed Yes Flash faults No Phone is dead PWR filter components L260 L265 25mA 70 mA OK jammed ...

Page 40: ...re VIO VCORE FLASH1 VANA VR3 voltages Are they OK VBATT1 6 VIO VCORE FLASH1 VANA VR3 lines Are they OK No Yes Check BSI BTEMP lines If OK UEM regulators are not working Change UEM Measure 26MHz RFClk from C660 Is it OK No Check R661 C661 R660 C660 if OK change G660 No Check R420 C420 if OK change N600 Yes Change UEM No Yes Check L260 L265 C260 C265 BSI BTEMP lines and VBATT lines No Check B200 C20...

Page 41: ...A from testpoint J414 Is it OK Yes No Measure DBUSClk 1MHz signal from testpoint J406 Is it OK No No Read phone info Is it OK Yes info read from test point J412 Is it OK Change UEM from testpoint J411 Is it OK Yes Change UPP Change UEM Yes Change LA4 module Retest Yes No No No Measure FBUSRX signal during phone Measure FBUSRX signal during phone info read from ...

Page 42: ...lse Check these lines and X101 C104 C240 R202 R206 No FBUSTX line at test point J411 20ms after BSI pulse Does it go low then pulses Yes Check R102 If OK Change UEM No Yes Try to to PPM file Yes No MBUS_CLK FBUS RX DATA when Flash start All OK Measure Change UPP END Yes No Change flash only OK Flash test phone OK faults BT ...

Page 43: ...UDWLRQ 3DJH Flash programming doesn t work 2 LJXUH Wrong manufactor ID and Device ID Flash faults page 2 Change FLASH Yes Is the phone No Phone is dead Yes Phone doesn t start up or the phone is jammed No Phone is jammed Yes Retest No totally dead ...

Page 44: ...r Retest No Measure voltage over TVS V100 Is it 3 0 Vdc Yes Check X100 V100 C113 C118 C112 F100 and line No BTEMP value Compare it to ambient temperature Is it 25 C Yes Check X101 C104 R202 R207 C220 fuse F100 and measure current Is it 350 390 mA Yes Change UEM No Retest Yes No not scrolling Read 0319 Is grip OK Change grip and lline Remove ...

Page 45: ...ne X101 C202 C104 C240 R260 If OK Change UEM No Measure VSIM voltge from X386 Is it 3V Check VSIM line X386 C203 C389 If OK Change R388 If still wrong VSIM voltage Change UEM No Check SIM power UP sequency Is it OK Yes Check SIM lines If OK Change R388 If still fail Change UEM No Change UPP Yes END No Check X386 Yes Set phone VSIM SIMCLK SIMDATA SIMRST First 1 8 V then 3 0 V ...

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Page 47: ...now No Retest Yes Set phone in LOCAL mode Use Phoenix Audio Test Set EXT IN HP OUT LOOP ON No Measure DC offset voltage from Earpiece pads Is it 1 38V Check L151 C160 R164 and line If OK Change UEM No Audio faults 2 Yes MICB2 voltage from XMICP pads C105 Is it 2 2V Yes Check L106 C112 R161 C163 R166 C165 R167 and line If OK change UEM No Earpiece Yes Connect grip Measure ...

Page 48: ...y change grip Is it working now Retest No Yes Set phone in LOCAL mode Use Phoenix Audio Test Set HP IN EXT OUT LOOP ON No Measure MICB1 voltage from MICP Is it 2 1V Check L104 C107 C152 R152 R153 C168 C166 C215 and line If OK Change UEM No Check C151 R157 and line If OK Change UEM Yes Audio faults 3 Yes pads C107 retest If fail change UPP ...

Page 49: ...oting 3 Audio faults 3 Is BUZZER working Measure VBATT voltage from B301 Is it OK No Check VBATT line No Set phone in LOCAL mode Use Phoenix Audio Test Set Buzzer volume ON Yes buzzer control signal from BUZZER C326 Is it 1kHz Change BUZZER B301 Yes Check C306 C307 C308 and line IF OK Change UEM No END Yes Measure pulses ...

Page 50: ...Page 27 Nokia Corporation Connect EXT audio signal 1kHz sine 200mVp p in XMICP pads C105 and Ground in XMICN C103 sine signal from earpiece pads Is it 880mVp p Earpiece from UEM R156 Is it 130mVp p No Retest Yes Change UEM Yes Check R156 C153 C155 R166 R167 C163 R161 and line No Measure Measure sine signal ...

Page 51: ... N320 pin 7 Is it 4 2 V No Check line to UEM No Yes Check R325 N320 and CALLED1 line Display faults 2 Yes Check X303 No C328 and line to X303 Measure DC voltage from C328 Is it 0V DC voltage Check VBAT line N320 pin 1 C322 R326 C327 C320 C321 C325 If OK change N320 to UEM KLIGHT line must be in LOW state when lights on and in high impedance state when lights off IF OK change UEM Replace Set phone ...

Page 52: ...lay led s turned on Measure DC voltage from V324 V325 anode Is it 4 1 V Check LED s and line Check line to UEM DLIGHT must be in Lines to LEDs broken No Yes No No Display faults 3 Yes Measure DC voltage from R310 Is it 0V Change LA4 module LOW state when lights are ON and in high impedance state when lights are OFF IF OK change UEM Yes ...

Page 53: ...Display module Is it working now No Retest Yes Measure VDD 2 78V and VDDI 1 8V from Is it OK Check C303 and solders If OK No Measure VOUT voltage Is it 8 1V Yes Check C330 X300 and No Measure XRES XCS Is it 1 8 V Yes Check X300 and lines If OK change UPP No END Yes Yes Check X300 No Try change X300 Change LA4 lines to X300 are broken module lines ...

Page 54: ...Keypad troubleshooting 1 LJXUH Keypad faults Is the power key OK Measure voltage from S302 Is it HIGH No Check R301 C312 S302 and line If OK Change UEM No Measure voltage from S300 when power key is pressed Is it HIGH Yes Yes Change S302 Phone is jammed No Keypad faults 2 Yes ...

Page 55: ...king now Keypad faults 2 Measure ROW0 to ROW4 lines from X303 Are these Check ROW0 4 Lines X303 If OK change Z301 If still fail change UPP No Measure COL1 4 lines Are these 0 V Yes change UPP No Yes END Yes Check X303 No Are LK 4 END 1 8V Press one key Pulses must be in all ROW and COL lines If not change first Z301 then UPP Change Z301 If still fail ...

Page 56: ... If OK change antenna Check Change BT module Check is SLEEPX pad 48 1 8 V 26MHz SYSCLK Is it 200mVpp typ 600mVpp Check for open short circuits is SPCLK pad 26 32 kHz Check CBUS pads34 36 and other signals to BT module If all OK replace BT module Check L132 L133 C131 C132 R130 and BT module solders If all OK lines to BT module broken Replace LA4 module Check V660 Check C133 R660 R662 R663 C664 and ...

Page 57: ...Change grip Now OK Measure S300 pin 1 Is it 2 8VDC Retest No Use Phoenix ADC reading Is Resistive keyboard 1 converter 0V Bring magnet close to S300 Is voltage now 2 8VDC Check R327 C319 If OK replace S300 Check KEYB1 line S300 solders R202 If OK replace S300 Yes Check that the magnet is enough near S300 when the grip is closed If OK replace S300 Yes Yes Yes Yes No No No ...

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Page 61: ...897 4 MHz GSM900 29 dBm 1747 8MHz GSM1800 OK power levels OK power levels OK Yes on 500 MHZ span Signal found on incorrect frequency TX troubleshooting the signal level on PA input 0dBm OK HAGAR troubleshooting and check tuned DAC values Highest level 700 GSM900 Highest level 600 GSM1800 Lowest level 1780 Base level 150 Major differences No PA ctrl voltage 1 5V peak OK loop components OK When 1kOh...

Page 62: ...VR2 VR4 VR6 2 7V OK Yes Check with RF probe No 4G VCO out signal 3589 6 MHz GSM900 OK Yes VrefRF01 VrefRF02 1 35V HAGAR serial interface TXP TXC signals Baseband troubleshooting 3495 6 MHz GSM1800 Level 10dBm When 1kOhm passive probe is used correct measurement result by 26dB Synthesizer troubleshooting Check modulator output components OK Replace HAGAR Yes Replace faulty components No ...

Page 63: ...lt by 26dB OK No Check with RF probe PA output signal level Check with oscilloscope PA ctrl voltage 1 5V peak OK Yes Replace HAGAR Check with oscilloscope PA Vcc Vcc1 Vcc2 Vcc3 2 7V OK Yes PA bias 2 7V pulsed VTxLO_GSM 0V GSM900 Replace PA No Yes OK Check ant switch Tx control line components No Replace faulty components Yes Yes Yes Check modulator output components OK Replace HAGAR Yes Replace fa...

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Page 67: ...02 L503 Oscilloscope V500 RFout 2 7V Check V500 L500 R502 V500 RFin 0 8V Yes Check baseband Check HAGAR N600 Yes No Check C502 Yes Yes Oscilloscope VR4 2 7V Check HAGAR serial interface check R501 No Yes No Yes Spectrum 900 bal out 66 dBm analyzer Yes Check Z501 C505 C506 L501 Oscilloscope VR4 2 7V Check HAGAR serial interface burst mode Check baseband Spectrum 4G VCO out 3769 6 MHz analyzer 30 dB...

Page 68: ...Oscilloscope V550 RFout 2 6V Check V550 R551 L550 R558 Yes Check baseband Check HAGAR N600 Yes No Check C552 Yes Yes Oscilloscope VR4 2 7V Check HAGAR serial interface check R501 No Yes No Yes Spectrum 1800 bal out 66 dBm analyzer Yes Check Z551 C555 C556 L551 Oscilloscope VR4 2 7V Check HAGAR serial interface burst mode Check baseband Spectrum 4G VCO out 3685 6 MHz analyzer 30 dBm Synthesizer tro...

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Page 71: ... Synthesizer OK Yes VCO out signal level 10dBm Check balun output levels and solder joints OK Replace faulty components No Yes Check with oscilloscope VCO control voltage from VCO pin 0V Yes Yes Check with oscilloscope 4 0V Yes Yes Replace VCO No Check output signal Yes on 1GHz span Signal found on incorrect frequency No and solder joints OK Check balun output levels OK Check with oscilloscope 4G ...

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