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NHM-4 Disassembly Instructions.................................................................................. 5 Phone disassembly steps ..............................................................................................5 Reassembly ................................................................................................................19 Bluetooth module removal and reassembly ...............................................................20 Transceiver Troubleshooting .................
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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.
NHM-4 CCS Technical Documentation Lift up the battery cover Figure 4: Battery cover lifted up Remove the battery cover. Figure 5: Battery cover removal Remove the battery.
NHM-4 CCS Technical Documentation 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.
NHM-4 CCS Technical Documentation 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.
NHM-4 CCS Technical Documentation The limiter shown here: Figure 13: Limiter shown Push the limiter backwards and up.
NHM-4 CCS Technical Documentation 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 3DJH 1RNLD &RUSRUDWLRQ 'UDIW
NHM-4 CCS Technical Documentation 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 'UDIW 1RNLD &RUSRUDWLRQ 3DJH
NHM-4 CCS Technical Documentation 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.
NHM-4 CCS Technical Documentation 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.
NHM-4 CCS Technical Documentation Open the screws.
NHM-4 CCS Technical Documentation 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.
NHM-4 CCS Technical Documentation Open the locking to the shield by pressing the locking clip with a flat screwdriver. )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.
NHM-4 CCS Technical Documentation Remove the keyboard assembly from the A-cover. Figure 36: Keyboard assembly removal Remove the keymat.
NHM-4 CCS Technical Documentation 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.
NHM-4 CCS Technical Documentation 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.
NHM-4 CCS Technical Documentation 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.
NHM-4 CCS Technical Documentation 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.
NHM-4 CCS Technical Documentation Figure 48: BT module is desoldered The soldering pads are shown below. Figure 49: Soldering pads The BT module is destroyed during desoldering.
NHM-4 CCS Technical Documentation 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.
NHM-4 CCS Technical Documentation 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.
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NHM-4 CCS Technical Documentation 0DLQ WURXEOHVKRRWLQJ WUHH Main troubleshooting tree, 1 )LJXUH TOP Phone totally dead Yes Phone is dead Yes Phone is Phone jammed No Flash programming doesn’t work No Phone doesn’t Yes start up or the phone is jammed Flash faults No Charging doesn’t work Yes Charger No TOP 2 3DJH 1RNLD &RUSRUDWLRQ 'UDIW
NHM-4 CCS Technical Documentation 0DLQ WURXEOHVKRRWLQJ WUHH )LJXUH TOP 2 Phone doesn’t read SIM card Yes SIM card No Yes Audio faults Yes Display faults Yes Keypad faults Audio faults No Display or LED’s doesn’t work No Keypad doesn’t work No 'UDIW TOP 3 1RNLD &RUSRUDWLRQ 3DJH
NHM-4 CCS Technical Documentation 0DLQ WURXEOHVKRRWLQJ WUHH )LJXUH TOP 3 Bluetooth connwction does not work Yes BT faults No Grio open/ close does not work electrically Yes Grip switch faults No END 3DJH 1RNLD &RUSRUDWLRQ 'UDIW
NHM-4 CCS Technical Documentation Phone is dead )LJXUH Phone is dead Phone current is zero ? Check X101 solder and VBATT lines PWR filter components L260–L265 Yes No Yes Phone current is <25mA No Yes Is phone flash programing OK ? Phone is jammed No Flash faults No Phone current is ~70 mA Yes Is phone in LOCAL MODE ? Yes No Check BSI line X101, C104, C240, R202, R206 Are these OK? Yes Phone is jammed No Repair OK retest 'UDIW 1RNLD &RUSRUDWLRQ 3DJH
NHM-4 CCS Technical Documentation Phone is jammed, 1 )LJXUH Phone is jammed Measure VIO, VCORE, FLASH1, No VANA, VR3 voltages. Are they OK ? Check VBATT1–6 VIO, VCORE, FLASH1, VANA, VR3 lines. Are they OK? No Check BSI / BTEMP lines. If OK –> UEM regulators are not working Change UEM Yes Yes Measure 32.6kHz Sleep Clk from testpoint J404 Is it OK ? No No Yes Measure PURX signal from testpoint J402. Is it high (1,8V) ? No Yes Yes Measure 13MHz RFClk from C420 Is it OK ? Measure 32.
NHM-4 CCS Technical Documentation Phone is jammed, 2 )LJXUH Jammed Page 2 Phone shutdown after 30s Measure watchdog No signal CBUSDA from testpoint J414 Is it OK ? Yes Change UPP No Measure DBUSClk 1MHz signal from testpoint J406 Is it OK ? No Yes Read phone info.
NHM-4 CCS Technical Documentation Flash programming doesn’t work, 1 )LJXUH Flash faults Measure BSI pulse, MBUS_CLK, FBUS RX DATA when Flash start All OK? Check these lines and X101, C104, C240, R202, R206 No Yes Measure FBUSTX line at test point J411 20ms after BSI pulse. Does it go low, then pulses ? No Check R102 If OK –> Change UEM Yes Try to flash only to PPM–file. Yes BT OK ? faults No Change Flash, test phone.
NHM-4 CCS Technical Documentation Flash programming doesn’t work, 2 )LJXUH Flash faults page 2 Yes Change FLASH Yes Phone is dead Yes Phone is jammed Wrong manufactor ID and Device ID No Is the phone totally dead ? No Phone doesn’t start up or the phone is jammed ? No Retest 'UDIW 1RNLD &RUSRUDWLRQ 3DJH
NHM-4 CCS Technical Documentation Charging troubleshooting Connect (ACP–7) charger Charger Battery bar doesn‘t work (not scrolling) )LJXUH No Retest Check X100, V100, C113 C118, C112 F100 and line Yes Measure voltage over (TVS) V100. Is it > 3.0 Vdc ? No Is grip OK ? Change grip Yes Read BTEMP value. (Compare it to ambient temperature) Is it ~ 25 C (0319 ?) Check X101,C104 R202, R207 C220 and lline No Yes Remove fuse F100 and measure current. No Is it ~350...
NHM-4 CCS Technical Documentation SIM card is out of order (insert SIM card) )LJXUH SIM card Insert SIM card faults Yes Set phone in LOCAL mode Is it OK ? No Check BSI line X101, C202 C104, C240 R260 If OK –> Change UEM Yes No Check X386 Measure VSIM voltge from X386 Is it 3V ? No Check VSIM line,X386, C203, C389. If OK –> Change R388. If still wrong VSIM voltage –> Change UEM Yes * VSIM SIMCLK SIMDATA SIMRST First 1.8 V then 3.
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NHM-4 CCS Technical Documentation Audio troubleshooting 1 )LJXUH Audio faults No Is earpiece working? Yes Try change earpiece. Yes Is it working now ? Retest No Connect grip. Set phone in LOCAL mode. Use Phoenix Audio Test. Set EXT IN, HP OUT, LOOP ON. Measure DC offset voltage from Earpiece pads. Is it ~1.38V ? No Check L151, C160, R164 and line. If OK –> Change UEM Yes Measure MICB2 voltage from XMICP pads (C105) Is it ~2.2V ? No Check L106, C112, R161, C163, R166, C165, R167 and line.
NHM-4 CCS Technical Documentation Audio troubleshooting 2 )LJXUH Audio faults 2 Is microphone OK ? Yes No Try change grip. Is it working now ? Yes Retest No Set phone in LOCAL mode. Use Phoenix Audio Test. Set HP IN, EXT OUT, LOOP ON. Measure MICB1 voltage from MICP pads (C107) Is it ~2.1V ? No Check L104 C107, C152, R152, R153, C168, C166, C215 and line. If OK –> Change UEM Yes Check C151, R157 and line. If OK –> Change UEM, retest..
NHM-4 CCS Technical Documentation Audio troubleshooting 3 Audio troubleshooting 3 )LJXUH Audio faults 3 Is BUZZER working? Yes No Measure VBATT voltage from B301. Is it OK? No Check VBATT line Yes Set phone in LOCAL mode. Use Phoenix Audio Test. Set Buzzer volume ON. Measure buzzer control signal from BUZZER (C326) Is it 1kHz pulses? Yes Change BUZZER (B301) No Check C306, C307, C308 and line.
NHM-4 CCS Technical Documentation Earpiece troubleshooting )LJXUH Earpiece Connect EXT audio signal 1kHz (sine) (¨200mVp–p) in XMICP pads (C105) and Ground in XMICN (C103) Measure sine signal from earpiece pads. Is it ~880mVp–p ? No Measure sine signal from UEM (R156) Is it ~130mVp–p ? Change UEM. No Yes Check R156, C153, C155, R166, R167, C163, R161 and line.
NHM-4 CCS Technical Documentation Display troubleshooting 1 )LJXUH Display faults Set phone into local mode. Set VBATT 4.2 V Start Display test with Phenix Set display, keypad lights ON Replace keyboard module Keyboard LEDs Yes Retest now OK ? keyboard No Check R313, C328 and line to X303 No led’s turned on ? Check X303 Yes Measure DC voltage Yes Yes Measure DC voltage from C328 from X303 pin. 2. Is it 4.1V ? Is it ~0V? No Measure DC voltage from N320/pin 7 No No Is it ~4.
NHM-4 CCS Technical Documentation Display troubleshooting 2 )LJXUH Display faults 2 Are the display led’s turned on ? Yes Check LED‘s and line No Measure DC voltage from V324, V325 anode Is it 4.
NHM-4 CCS Technical Documentation Display troubleshooting 3 )LJXUH Display faults 3 Try change Display module Is it working now ? Yes Retest No Does the display start ? No Yes Check X300 Measure VDD (2.78V) and VDDI (1.8V) from X300 Is it OK? No Change LA4 module Yes Measure VOUT voltage. Is it ~8.1V? Check C303 and solders If OK, lines to X300 are broken No Check C330 X300 and lines Yes Measure XRES, XCS. Is it ~1.8 V? No Check X300 and lines.
NHM-4 CCS Technical Documentation Keypad troubleshooting 1 )LJXUH Keypad faults Measure voltage from S302 Is it HIGH ? No Is the power key OK ? Yes No Check R301, C312, S302 and line. If OK –> Change UEM Yes Measure voltage Yes from S300 when power key is pressed.
NHM-4 CCS Technical Documentation .H\SDG WURXEOHVKRRWLQJ Keypad faults 2 Are LK 4 module keys OK ? Yes No Try change LK 4 Is it working now ? Yes Retest No Check X303 END END Measure ROW0 to ROW4 No lines from X303 Are these ~1.8V ? Check ROW0 – 4 Lines, X303. If OK change Z301. If still fail change UPP Yes Measure COL1–4 lines Are these No Change Z301 If still fail, change UPP ~0V? Yes Press one key. Pulses must be in all ROW and COL lines.
NHM-4 CCS Technical Documentation Bluetooth troubleshooting )LJXUH Bluetooth faults Yes Is BT flashing OK ? No Use Phoenix SW BT locals. Run self–tests. All passed? Yes Check VBAT (pads 52–54) VIO (pads 18, 32, 49/1.8VDC) VFLASH1 (pad 6/2,8VDC) Yes All OK ? Check BT antenna connections. If OK–> change antenna No Change BT module No Check 26MHz SYSCLK Is it >200mVpp ? (typ.
NHM-4 CCS Technical Documentation Grip switch troubleshooting )LJXUH Grip switch faults Cannot answer/end call when open/close grip Yes Yes Change grip. Now OK? No Retest Measure S300/pin 1 Is it 2.8VDC? Yes No Check R327, C319 If OK –> replace S300 Use Phoenix ADC reading Is ”Resistive keyboard 1” converter ~0V ? Yes No Check KEYB1 line, S300 solders, R202 If OK –> replace S300 Bring magnet close to S300 Is voltage now ~2.
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NHM-4 CCS Technical Documentation 7UDQVPLWWHU WURXEOHVKRRWLQJ GLDJUDP )LJXUH 7UDQVPLWWHU WURXEOHVKRRWLQJ TX OK TX troubleshooting Yes Yes Yes Check output signal level +32 dbm@897.4 MHz (GSM900) +29 dBm@1747.8MHz (GSM1800) OK? No No TX signal found ? Yes Tune Tx power levels OK? Check all power levels OK? Check output signal Yes on 500 MHZ span.
NHM-4 CCS Technical Documentation +DJDU WURXEOHVKRRWLQJ )LJXUH +DJDU WURXEOHVKRRWLQJ HAGAR troubleshooting Check with oscilloscope –TXI/TXQ signals –VR2, VR4, VR6 = 2.7V -VrefRF01, VrefRF02 = 1.35V -HAGAR serial interface -TXP & TXC signals OK? Baseband troubleshooting No Yes Check with RF probe 4G VCO out signal 3589.6 MHz (GSM900) 3495.
NHM-4 CCS Technical Documentation 3$ $QWHQQD VZLWFK WURXEOHVKRRWLQJ )LJXUH 3$ $QWHQQD 6ZLWFK *When 1kOhm passive probe is used, correct measurement result by +26dB PA&ant. switch troubleshooting No Check with RF probe PA output signal level * Yes OK? No Check with oscilloscope PA ctrl voltage >1.5V peak OK? Yes Replace HAGAR Yes Check with oscilloscope -PA Vcc, Vcc1, Vcc2, Vcc3=2.7V -PA bias = 2.7V pulsed -VTxLO_GSM = 0V (GSM900) Check ant.
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