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SAMSUNG Proprietary-Contents may change without notice

7. SGH-N620E Flow Chart of Troubleshooting

7-1

This Document can not be used without Samsung's authorization

1. Power On

Check the Battery Voltage

is more than 3.2V?

' Power On ' does not work

Change the Battery

END

No

Yes

WHen the "END" key is

pressed, the voltage of

"D104" pin is 3.6V?

Check the Dome sheet

No

Yes

U102 pin 10
U103 pin 5 ≠ 2.5V

Check the circuit related to

U102,U103

No

Yes

U101 pin 5 ≠ 3.3V
U102 pin 3 ≠ 3.0V

Check U101, U102 and related circuit

No

Yes

Check for the clock signal at

R320

Check the clock generation circuit

(related to OSC301 and Q304)

No

Yes

Check the initial operation

Summary of Contents for SGH-N620E

Page 1: ... SERVICE Manual GSM TELEPHONE CONTENTS 1 Specification 2 Circuit Description 3 Exploded Views and Parts List 4 Electrical Parts List 5 Block Diagrams 6 PCB Diagrams 7 Flow Chart of Troubleshooting GSM TELEPHONE ...

Page 2: ...ELECTRONICS Samsung Electronics Co Ltd February 2003 Printed in Korea Code No GH68 04684A BASIC ⓒ ...

Page 3: ... 1785 1805 1880 ARFCN range 1 124 1 124 975 1023 512 885 Tx Rx spacing 45MHz 45MHz 95MHz Mod Bit rate Bit Period 270 833kbps 3 692us 270 833kbps 3 692us 270 833kbps 3 692us Time Slot Period Frame Period 576 9us 4 615ms 576 9us 4 615ms 576 9us 4 615ms Modulation 0 3GMSK 0 3GMSK 0 3GMSK MS Power 33dBm 5dBm 33 5 30dBm 0dBm Power Class 5pcl 19pcl 5 19 0pcl 15pcl Sensitivity 102dBm 102dBm 100dBm TDMA M...

Page 4: ...6 31 2 dBm 7 29 2 dBm 8 27 2 dBm 9 25 2 dBm 10 23 2 dBm 11 21 2 dBm 12 19 2 dBm 13 17 2 dBm 14 15 2 dBm 15 13 2 dBm 16 11 3 dBm 17 9 3dBm 18 7 3 dBm 19 5 3 dBm TX Power control level DCS1800 0 30 3 dBm 1 28 3 dBm 2 26 3 dBm 3 24 3 dBm 4 22 3 dBm 5 20 3 dBm 6 18 3 dBm 7 16 3 dBm 8 14 3 dBm 9 12 4 dBm 10 10 4 dBm 11 8 4dBm 12 6 4 dBm 13 4 4 dBm 14 2 5 dBm 15 0 5 dBm 2 GSM TX power class ...

Page 5: ...orts the E GSM DCS input supports the DCS1800 The LNA inputs are matched to the 200 ohm differential output SAW filters through external LC matching network Image reject mixer downconverts the RF signal to a 100 KHz intermediate frequency IF with the RFLO from SI4133T frequency synthesizer The RFLO frequency is between 1737 8 1989 9 MHz The Mixer output is amplified with an analog programmable gai...

Page 6: ...f the LCD 8 bit data lines D 0 D 7 transfers data and commands to LCD through bypass capacitor Data and commands use A 0 signal If this signal is high Inputs to LCD are commands If it is low Inputs to LCD are data The signal which informs the input or output state to LCD is required But this system is not necessary this signal So WR signal is used to write data or commands to LCD Power signal for ...

Page 7: ...tween sound and images various contents can be written into it including incoming call melody with words that can be used for traning karaoke and commercial channel that combines texts images and sounds and others The hardware sequencer of YMU759AE2 directly interprets and plays blocks relevant to systhesis playing music and reproducing ADPCM with FM synthesizer that are included in data distribut...

Page 8: ...SAMSUNG Proprietary Contents may change without notice 3 SGH N620E Exploded View and its Parts list 3 1 This Document can not be used without Samsung s authorization 1 Cellular phone Exploded View ...

Page 9: ...536A 1 4 PBA 1 4 1 COVER LCD GH73 00923A 1 4 2 LCD ASS Y 1 4 3 PCB 1 4 4 INSULATION TAPE GH74 05984A 1 5 KEY VOLUME GH75 01490A 1 6 IF COVER GH73 00893A 1 7 INSULATION TAPE GH74 07032A 1 8 SHIELD REAR GH72 10708A 1 9 REAR COVER ASS Y GH75 03841A 1 9 1 REAR COVER GH72 10707A 1 9 2 SPRING LOCKER GH70 10516A 1 9 3 LOCKER MAIN GH72 03116A 1 9 4 COVER EAR PHONE GH73 00894A 1 9 5 METAL MANGSA REAR GH74 ...

Page 10: ...E Exploded view and its Part list 3 3 This Document can not be used without Samsung s authorization 3 Test Jig GH80 10508A 3 1 RF Test Cable GH39 00174A 3 2 Test Cable GH39 00079A 3 3 Serial Cable 3 4 Power Supply Cable 3 5 DATA CABLE GH39 00078A 3 6 TA GH44 00184G ...

Page 11: ...ED109 0801 002540 U203 0801 002540 U204 1001 001145 U207 1103 001440 U109 1103 001288 U208 1109 001204 U201 1201 001954 U103 1202 001036 U210 1203 002077 U101 1203 002187 U209 1203 002598 U104 SEC Code Design LOC 1203 002766 U102 1203 003004 U106 1204 001811 U107 1205 002035 U205 1205 002185 U304 1205 002268 U302 1209 001434 U305 1404 001221 V103 1405 001082 V106 1405 001082 V107 1405 001082 V108 ...

Page 12: ...62 R218 2007 000162 R220 2007 000162 R221 2007 000162 R224 2007 000162 R226 2007 000162 R227 2007 000162 R228 2007 000162 R233 2007 000162 R241 2007 000162 R242 2007 000168 R234 SEC Code Design LOC 2007 000170 R116 2007 000170 R249 2007 000171 R206 2007 000171 R309 2007 000172 R108 2007 000172 R109 2007 000172 R112 2007 000172 R113 2007 000172 R302 2007 000172 R242 2007 000174 R127 2007 000174 R13...

Page 13: ...33 C309 2203 000233 C320 2203 000233 C325 2203 000233 C329 2203 000233 C338 2203 000254 C106 2203 000254 C107 2203 000254 C134 2203 000254 C136 2203 000254 C212 2203 000254 C241 SEC Code Design LOC 2203 000254 C242 2203 000254 C243 2203 000254 C247 2203 000254 C251 2203 000254 C334 2203 000254 C335 2203 000359 C206 2203 000359 C207 2203 000359 C208 2203 000359 C209 2203 000386 C157 2203 000438 C15...

Page 14: ...05 C318 2203 001405 C324 2203 001405 C330 2203 001405 C331 2203 003054 C131 2203 003054 C204 2203 003054 C248 2203 005050 C310 2203 005050 C312 2203 005061 C104 2203 005061 C118 SEC Code Design LOC 2203 005061 C122 2203 005061 C123 2203 005061 C124 2203 005061 C125 2203 005061 C129 2203 005061 C132 2203 005061 C135 2203 005061 C137 2203 005061 C139 2203 005061 C143 2203 005061 C149 2203 005061 C15...

Page 15: ...2404 001239 C102 2404 001239 C221 2404 001239 C323 2404 001268 C160 2503 001053 CA100 2503 001053 CA101 2703 001723 L304 2703 001723 L305 2703 001747 L302 2703 001749 L311 2703 001752 L102 2703 001938 L310 2703 002205 L309 2703 002484 L303 2703 002485 L306 2801 003747 OSC201 2809 001264 OSC301 2901 001116 F101 2901 001254 L120 2904 001417 F302 2904 001470 F301 2909 001197 U301 3301 001362 L101 340...

Page 16: ...rams 1 Main Baseband SYSTEM CLOCK 13MHz SRAM FLASH EEPROM RTC_CLOCK 32 768KHz KEYPAD LCD ONE C Li ion BATT STANDARD CHARGING CIRCUIT SIM CARD BATTERY TYPE BATTERY VOLTAGE PHONE TEMPRATURE CHARGING CURRENT XVCC 3VRF VDD3 0 AVCC2 5 LVCC PLL AFC A D INTERFACE I O INTERFACE SERIAL DATA INTERFACE RF INTERFACE BB INTERFACE MIC SPEAKER RTC_VCC LED3V3 ...

Page 17: ...ual PAM U303 Si4133T BM U305 Si4201 BM U304 CN301 RF CONNECTOR U301 ANTTENA S W F301 SAW FILTER F302 SAW FILTER RF PLL IF PLL PD LPF CHANNEL FILTER DAC DAC OSC301 VCTCXO I Q VP40578 AFC I Q PGA PGA PGA PGA ADC ADC 100KH z PGA PGA EGSM RX 925 960 MHz CH62 947 4MHz DCS RX 1805 1880 MHz CH698 1842 4M Hz DCS TX 1710 1785 MHz CH698 1747 4MHz GSM TX 880 915 MHz CH62 902 4MH z ...

Page 18: ...2 4MHz AFC PDNB VP40578 I Q SDATA SCLK SENB PDNB TxPower TXEN 6 7 8 Si4133T BM U305 RF PLL IF PLL OSC301 VCTCXO J2 3VRI BANDSEL _BANDSEL ANT S W CONTROL CIRCUIT 2 11 Tx DCS Tx GSM VC1 VC2 L H H L Rx L L EGSM 1279 1314 MHz DCS 1327 1402 MHz EGSM 880 895 MHz 798 MHz 895 900 MHz 790 MHz 900 915 MHz l 798 MHz DCS 766 MHz 23 24 6dBm 1301 4 MHz G 9dBm 1364 4 mhZ D 12 13 26 27 9 10 6dBm 798 MHz 9dBm 766 ...

Page 19: ...04 CHANNEL FILTER DAC DAC PGA PGA 100 KHz Mixer PGA PGA ADC ADC LNA LNA GSM 2 Si4133T BM U305 RF PLL OSC301 VCTCXO U301 ANTTENA S W F301 SAW FILT ER F302 SAW FILT ER CN301 RF CONNECTOR 50dBm 947 067 MHz 50dBm 1842 467 MHz 2 3 8 10 1 EGSM RX 925 960 MHz CH62 947 4 MHz 51dBm 50dBm 52dBm 52dBm 21 22 17 18 3 4 3 4 1 1 1 2 1 2 11 12 11 12 50dBm 54dBm 67KHz 5 4 3 2 6dBm 1895 6 MHz G 9dBm 1842 3 MHz D 23...

Page 20: ...SAMSUNG Proprietary Contents may change without notice 6 SGH N620E PCB Diagrams 6 1 This Document can not be used without Samsung s authorization 1 Main PCB Top Diagram ...

Page 21: ...SAMSUNG Proprietary Contents may change without notice SGH N620E PCB Diagrams 6 2 This Document can not be used without Samsung s authorization 2 Main PCB Bottom Diagram ...

Page 22: ...ower On does not work Change the Battery END No Yes WHen the END key is pressed the voltage of D104 pin is 3 6V Check the Dome sheet No Yes U102 pin 10 U103 pin 5 2 5V Check the circuit related to U102 U103 No Yes U101 pin 5 3 3V U102 pin 3 3 0V Check U101 U102 and related circuit No Yes Check for the clock signal at R320 Check the clock generation circuit related to OSC301 and Q304 No Yes Check t...

Page 23: ...SAMSUNG Proprietary Contents may change without notice SGH N620E Flow Chart of Troubleshooting 7 2 This Document can not be used without Samsung s authorization Power On ...

Page 24: ...on check and repair the important signals of U209 as follos The node between R217 and C212 H RST Check the circuit related to reset Yes R234 H MSIZE Resolder R234 Resolder R233 No No No Yes Yes END R221 H BOOT R233 L EXTPROC Resolder R221 Check all the other connection by thes S W Yes No No Replace PBA Check the circuit around LCD Check the circuit around U300 EEPROM and data stored in it Power On...

Page 25: ... Contents may change without notice SGH N620E Flow Chart of Troubleshooting 7 4 This Document can not be used without Samsung s authorization Initial U209 U205 U300 R217 BOOT VCC C212 R221 SYSRST GPIO3 CSROM MSIZE VCC _CE ...

Page 26: ...his Document can not be used without Samsung s authorization 3 Charging Part Check the CN103 pin 17 18 4 9V Abnormal charging part END No Yes Check the U106 pin 3 4 9V No Yes R103 CHG_OIN side L No Yes Check Q014 pin 5 4 2V No Yes Replace TA Resolder U106 Resolder R103 Resolder components around U106 ...

Page 27: ...SAMSUNG Proprietary Contents may change without notice SGH N620E Flow Chart of Troubleshooting 7 6 This Document can not be used without Samsung s authorization Charging ...

Page 28: ...V Phone can t access SIM Card END No Yes U105 pin 5 H No Yes U105 pin 2 3 3 0 V No Yes After power on check SIMCLK signal on CN101 pin 3 in a few seconds No Yes Check the circuit around U102 Replace U105 or replace PBA Replace U105 Resoldering C108 or Replace After SIM card insert CN101 pin 2 H SIMRST No Yes Replace PBA Check the circuit around U208 Serial EEPROM and datad stored in it ...

Page 29: ...amsung s authorization 5 Microphone Part CN200 pin 4 5 short Microphone does not work END No Yes U102 pin 10 AVCC 2 5 V No Yes Check the circuit RC Filer to MIC201 No Yes Check soldering of MIC Module No Yes Resolder CN200 Check the circuit related to U102 Resolder the R230 R231 R220 R236 C219 C220 C221 C252 Replace the MIC or MIC Holder ...

Page 30: ...y Contents may change without notice SGH N620E Flow Chart of Troubleshooting 7 9 This Document can not be used without Samsung s authorization SIM Microphone U205 CN200 MIC201 VXO1P VXO1N RC FILTER 1 5 4 MIC MIC MIC MIC ...

Page 31: ...Chart of Troubleshooting 7 10 This Document can not be used without Samsung s authorization 6 Receiver Part CN200 pin 2 3 short Resolder CN200 END No Yes Yes Receiver does not work CN200 pin 2 3 6 1 5V Replace the PBA No Yes Is Receiver working Replace the Receiver No Yes ...

Page 32: ... of Troubleshooting 7 11 This Document can not be used without Samsung s authorization 7 Speaker Part Melody CN105 connected Speaker Is Speaker working Replace the Speaker END No Yes No Connect CN105 and Speaker U107 pin 7 3 0V Replace the U102 Yes No Yes Speaker does not work ...

Page 33: ... 2 M_CS MEL_13M D 0 D 1 D 2 D 3 D 4 D 5 D 6 D 7 M_LED VIBRATOR RD VBATT 27PF C153 3 3K 8 VSS IRQ 3 4 RST WR 28 R143 25 YMU759 QE2 U107 CLKI 1 27 D0 D1 26 D2 1 2K 220PF R138 100K R142 100K R139 1 24 8005 002 000 867 C154 100NF C161 1 2K C158 100NF 100NF C151 VDD3 0 C157 C150 100NF 15PF 220NF C162 U631 27PF 29 SDI N 32 SDOUT SPOUT1 17 18 SPOUT2 SPVDD 15 16 SPVSS SYNC 30 VDD 7 VREF 9 14 EQ3 2 EXT1 EX...

Page 34: ...E Flow Chart of Troubleshooting 7 13 This Document can not be used without Samsung s authorization 8 Key Data Input When one of the keys is pushed is it displayed on LCD Check the Dome sheet END No Yes Yes Keypad is OK Replace the PBA No Yes Check initial operation ...

Page 35: ...t can not be used without Samsung s authorization 9 Key Backlight Backlight ON mode in the menu Backlight does not work END No Yes R136 H No Yes Q105 pin 3 L No Yes KEY PCB LED on No Yes Select backlight ON mode GPIO5 by TEST S W Resolder R136 R137 or Resolder Q105 Resolder R126 R127 R129 R130 R131 R132 R133 R134 ...

Page 36: ...ice SGH N620E Flow Chart of Troubleshooting 7 15 This Document can not be used without Samsung s authorization 10 Ring Indicator U102 pin 12 H Resolder U102 END No Yes Yes Ring indicator LED does not work Resolder 3 color LED Replace 3 color LED No Yes ...

Page 37: ...L U301 pin10 53dBm F302 pin1 70dBm U302 pin6 1 2 50mV U302 pin 21 22 Check ANT Switch control circuit Resoder U301 Resolder C313 Resolder F302 C310 C312 L306 Check U302 pin 12 13 Freq 1000KHz 2 6dBm OK Chekc Resolder I O signal RF13MHz RF_PSU Part Resolder U302 U304 pin 2 3 4 5 100mV Yes Yes Yes Yes Yes Yes Yes Yes No No No No No No Resolder U205 Check U302 pin 12 13 Freq 1000KHz Check U304 pin 14...

Page 38: ... 7 30dBm U302 pin 25 0dBm U303 pin7 0dBm Change or Resolder U301 Check ANT Switch control circuit Resolder C308 Resolder R306 R307 R308 C321 U302 pin 5 6 7 8 40mV Yes Check U303 VBATT pin2 5 6 OK Resolder or Change U303 Check VBATT or PAM control signal Check U302 pin9 10 12 13 6dBm OK Check and Resolder I O signal RF 13MHz RF PSU part No No No No No No No No Yes Yes Yes Yes Yes Yes Yes Yes Yes EN...

Page 39: ...1 pin1 53dBm F301 pin1 53dBm U302 pin 1 2 50mV U302 pin 17 18 58dBm Check ANT Switch control circuit Resoder U301 Resolder C314 Resolder F302 C305 C307 L303 Check U302 pin 12 13 Freq 1000KHz 6dBm OK Chekc Resolder I O signal RF13MHz RF_PSU Part Resolder U302 Check U304 pin14 16 17 18 OK Yes Yes Yes Yes Yes Yes Yes Yes No No No No No No Resolder U205 Check U302 pin 45 23 31 32 2 7 U304 pin 2 3 4 5 ...

Page 40: ...Bm U303 pin11 25dBm U302 pin24 0dBm U303 pin1 0dBm Change or Resolder U301 Check ANT Switch control circuit Resolder C311 Resolder R302 R303 R304 C315 U302 pin5 6 7 8 40mV Yes Check U303 VBATT pin2 5 8 OK Resolder or Change U303 Check VBATT or PAM control signal Check U302 pin9 10 12 13 6dBm OK Check Resolder I O signal RF 13MHz No No No No No No No Yes Yes Yes Yes Yes Yes Yes Yes END Resolder U30...

Page 41: ...SAMSUNG Proprietary Contents may change without notice SGH N620E Flow Chart of Troubleshooting 7 20 This Document can not be used without Samsung s authorization Transmitter ...

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