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Samsung SGH-A500 Service Manual Download Page 25

SAMSUNG Proprietary-Contents may change without notice

6-

10

SGH-A500 Flow Chart of Troubleshooting and Circuit Diagrams

12. DCS transmitter

U201

PIN 

7&19=2.8V?

U201

PIN25=1.3~

1.5Vpp?

OSC101
PIN10>5

dBm(1747.4

MHz)?

F102

PIN3>4

dBm(1747.4

MHz)?

U103

PIN12=19~21

dBm(1747.4

MHz)?

F103

PIN7=19~21
dBm(1747.4

MHz)?

U101

PIN8=18~21
dBm(1747.4

MHz)?

CN101 CHECK/

CHANGE

YES

YES

YES

YES

YES

YES

YES

U601 

CHECK/

CHANGE

OSC202

PIN3=13MHz

2.76Vrms?

OSC201

PIN1=1323.4

MHz(-5~3

dBm)?

U201

PIN28>-14

dBm(1747.4

MHz)?

U201

CHECK/ 

CHANGE

NO

YES

YES

YES

OSC101

PIN5=2.8V?

OSC101
CHECK/

CHANGE

F101

CHECK/ 
CHANGE

YES

NO

U103

PIN6&8=

3.4~4.2V

?

U103

PIN14=

1.2~1.4V

?

U103

PIN16>2.5V

?

U103

CHECK/

CHANGE

F103

CHECK/ 
CHANGE

U101

PIN2=2.5~2.8V

&PIN11=0~0.5V

?

U101

CHECK/

CHANGE

NO

NO

YES

YES

NO

NO

NO

NO

OSC202

PIN4=2.8V?

OSC202

CHECK/ 
CHANGE

U601

CHECK/

CHANGE

NO

NO

YES

OSC201

PIN7=2.8V?

OSC201

CHECK/ 
CHANGE

U601

CHECK/

CHANGE

YES

NO

NO

OSC101

PIN10>5

dBm(1747.4

MHz)?

F105

CHECK/ 
CHANGE

NO

NO

YES

OSC101

PIN5=2.8V?

OSC101
C H E C K /

CHANGE

U601 CHECK/

CHANGE

NO

YES

BATTERY

CHECK/ 
CHANGE

NO

NO

CON101

PIN1=18~21
dBm(1747.4

M H z ) ?

ANT1

CHECK/

CHANGE

YES

NO

U104&U105

CHECK/

CHANGE

NO

YES

U104&U105

PIN4=2.8V

?

U601 

CHECK/

CHANGE

NO

YES

U201

CHECK/

CHANGE

YES

U102

PIN10=2.8V

?

U601 

CHECK/

CHANGE

NO

YES

NO

U102

PIN5>1747.4

MHz(-30dBm)

?

F104

PIN4>1747.4

MHz(-21dBm)

?

YES

F103

CHECK/

CHANGE

NO

F104

CHECK/

CHANGE

NO

U102

CHECK/

CHANGE

YES

CONTINUOUS  Tx  ON  

CONDITION

CH : 698

Tx POWER LEVEL : 5

RBW : 300KHz
VBW : 300KHz

ATT. : 30dB

Summary of Contents for SGH-A500

Page 1: ...0 SERVICE Manual GSM TELEPHONE CONTENTS 1 Specification 2 Exploded Views and Parts List 3 Electrical Parts List 4 Block Diagram 5 PCB Diagrams 6 Flow Chart of Troubleshooting and Circuit Diagrams GSM TELEPHONE ...

Page 2: ...ELECTRONICS Samsung Electronics Co Ltd November 2002 Printed in Korea Code No GH68 03059A BASIC ⓒ ...

Page 3: ...5 1023 512 885 Tx Rx spacing 45MHz 45MHz 95MHz Mod Bit rate B it Pe riod 270 833kbps 3 692us 270 833kbps 3 692us 270 833kbps 3 692us T ime Slot Pe riod Frame Pe riod 576 9us 4 615ms 576 9us 4 615ms 576 9us 4 615ms Modula tion 0 3GMSK 0 3GMSK 0 3GMSK MS Powe r 33dB m 13dBm 33dBm 5dBm 30dBm 0dBm Power Class 5pcl 15pcl 5pcl 19pcl 0pcl 15pcl Sensitivity 102dB m 102dBm 100dBm T DMA Mux 8 8 8 CE LL RADI...

Page 4: ...dBm 10 23 3 dBm 11 21 3 dBm 12 19 3 dBm 13 17 3 dBm 14 15 3 dBm 15 13 3 dBm 16 11 5 dBm 17 9 5 dBm 18 7 5 dBm 19 5 5 dBm TX Power control level DCS1800 0 30 2 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 Normal condition ...

Page 5: ...SAMSUNG Proprietary Contents may change without notice 2 SGH A500 Exploded View and its Parts list 2 1 1 Cellular phone Exploded View 15 6 7 8 9 10 11 12 14 17 18 19 20 21 22 23 25 24 16 13 1 2 3 4 5 ...

Page 6: ...REW 6001 001478 8 SCREW SHEET GH68 00370C 9 FRONT COVER GH75 02017A 10 VOLUME KEY GH75 01734A 11 KEYPAD GH75 02021A 12 MAIN PBA GH92 01299A 13 CON TO CON FPCB GH59 00524A 14 SHIELD COVER GH75 02210A 15 EAR JACK FPCB GH59 00525A 16 DOME SHEET GH59 00510A 17 MIC GH59 00491A 18 CONNECTOR COVER GH73 01132A 19 SCREW 6001 001661 20 ANTENNA GH42 00225A 21 REAR COVER GH75 02020A 22 RF TEST HOLE COVER GH73...

Page 7: ... notice SGH A500 Exploded view and its Part list 2 3 3 Test Jig GH80 01326A 3 1 RF Test Cable GH39 00172A 3 2 Test Cable GH39 00171A 3 3 Serial Cable 3 4 Power Supply Cable 3 5 DATA CABLE PCB086LBE 3 6 TA GH44 00171A 3 7 Dongle Lock Key GH80 00815A ...

Page 8: ... 1 2203 005054 C127 C CERAMIC CHIP 0 0047nF 0 25pF 50V NP0 TP 100 1 2301 001589 C129 C FILM CHIP 18NF 20 16V TP 1608 1 2404 001268 C130 C309 C604 C TA CHIP 10UF 20 10V TP 2 2X1 25X1 0 1 2203 006053 C132 C CERAMIC CHIP 1000NF 10 10V X5R TP 1608 1 2404 001239 C134 C614 C TA CHIP 100UF 20 6 3V WT TP 3 3X2 7X1 7MM 1 2203 000386 C201 C235 C CERAMIC CHIP 0 015nF 5 50V NP0 TP 1005 1 2203 000254 C203 C389...

Page 9: ... TP 1005 1 2203 005061 C404 C408 C410 C413 C CERAMIC CHIP 100nF 80 20 16V Y5V TP 1005 1 2203 002525 C407 C CERAMIC CHIP 0 56nF 10 50V X7R TP 1005 1 2404 001105 C409 C432 C501 C TA CHIP 10UF 20 6 3V GP TP 2012 1 2203 005061 C414 C416 C417 C418 C CERAMIC CHIP 100nF 80 20 16V Y5V TP 1005 1 2203 000425 C423 C428 C CERAMIC CHIP 0 018nF 5 50V NP0 TP 1005 1 2404 001281 C430 C431 C TA CHIP 22UF 20 6 3V WT...

Page 10: ...2369 L104 INDUCTOR SMD 1 5NH 0 3NH 1 0X0 5X0 5MM 1 3301 001336 L105 L601 CORE FERRITE BEAD AB 220ohm 2x1 25x0 85mm 2000mA T 1 2703 001802 L201 INDUCTOR SMD 33UH 20 2 0X1 25X1 25MM 1 2703 001944 L202 L203 INDUCTOR SMD 27nH 10 1 0x0 5x0 5mm 1 2703 001544 L204 INDUCTOR SMD 39nH 5 1 7x1 14x1 02 1 2703 001737 L205 INDUCTOR SMD 2 7nH 0 3nH 1x0 5x0 5mm 1 2703 001233 L206 INDUCTOR SMD 8 2uH 10 1 6x0 8x0 8...

Page 11: ...2007 007313 R208 R CHIP 6 8Kohm 1 1 16W DA TP 1005 1 2007 007309 R209 R CHIP 12Kohm 1 1 16W DA TP 1005 1 2007 000148 R212 R410 R502 R CHIP 10Kohm 5 1 16W DA TP 1005 1 2007 001320 R215 R CHIP 1 8Kohm 5 1 16W DA TP 1005 1 2007 000173 R220 R221 R CHIP 22ohm 5 1 16W DA TP 1005 1 2007 000142 R225 R CHIP 2 7Kohm 5 1 16W DA TP 1005 1 2007 000153 R226 R418 R CHIP 22Kohm 5 1 16W DA TP 1005 1 2007 000141 R2...

Page 12: ...INEAR PCF5079HK C 1 SOT 650 10P 118MIL PL 1 1201 001754 U103 IC POWER AMP MCM 16P PLASTIC 7V 25TO 10 1 0504 001130 U104 U105 U605 TR DIGITAL BCR35PN NPN PNP 250MW 10K 47K SO 1 1205 002203 U201 IC TRANSCEIVER PMB6253V1 1 VQFN 48P 7X7MM P 1 1109 001207 U302 IC ETC MEMORY 1380 32MX16 4MX16BIT CSP 72P 85NS 1 1204 001811 U303 IC MELODY YMU759 QE2 QFN 32P PLASTIC 6V 1 0902 001560 U401 IC MICROPROCESSOR ...

Page 13: ...T LDO LANA LDO LSIM LDO LRTC lin SDBB step down VBATS CHG charge control VCHC VCHS VDDPW SW FB VSSPW VDDA VINT VANA V3V VRTCVSIM LRF1 LDO LRF2 LDO VDDRF VRF1VRF2 VSSA BYP IREF VSSR T1 AC adapter Rsence 154k 100nF E POWER VBAT Keypad SIM CARD MEMORY YAMAHA CHIP 2 EPP1 EPN1 MICP1 MIC Keypad Interface 10 KP0 KP9 HEAD SET VBAT EPP2 MICP2 POWER ON MOTOR FLIP IC CCRST VSIM CCLK CCIO DISP_RST DISP_RS DIS...

Page 14: ...309 C310 C315 C316 C317 C320 C389 C410 C423C428 C430 C431 C504 C601 C602 C604 C605 C606 C607 C608 C609 C610 C611 C614 C615 C617 C634 CN301 CN302 CN303 CN401 CN501 CON101 D101 F101 F102 F103 F104 F105 F201 F202 F204 L101 L103 L104 L201 L202 L203 L204 L205 L206 L207 L208 L210 L211 L218 L601 L602 OSC101 OSC201 OSC202 OSC401 Q601 R101 R107 R109 R110 R111 R121 R204 R205 R206 R207 R208 R209 R212 R215 R2...

Page 15: ...EY11 KEY12 KEY13 KEY14 KEY15 KEY16 KEY17 KEY18 KEY19 KEY20 KEY21 L105 L213 LED13 LED14 LED501 LED502 LED503 LED504 LED505 LED506 LED507 LED508 LED509 LED510 LED511 LED512 LED513 LED514 LED515 LED516 Q103 Q502 Q503 Q506 Q602 R108 R113 R114 R118 R202 R203 R211 R213 R305 R308 R309 R310 R313 R330 R340 R402 R408 R409 R410 R411 R412 R413 R415 R416 R417 R418 R427 R428 R429 R430 R450 R452R453 R501 R502 R5...

Page 16: ... current consumption about 30mA I 500mA Check the Battery voltage more than 3 3V Yes No check the current consumption more than 1A No Yes Charge the Battery Check the Output voltage of E power U601 VANA pin 3 2 39V VINT pin 24 2 62V VSIM pin 21 2 85V V3V pin 22 2 85V VRF2 pin 37 2 85V No Check the U601 Check the clock signal at pin 3 of OSC202 FREQ 13MHz Yes No Check the OSC 202 clock circuit Chec...

Page 17: ...OSC202 is around 2 85V No Check resolder the OSC202 R221 U601 Check the LCD connector CN302 LCD FPCB assembly status Yes No Re solder CN302 Re assembly LCD FPCB Yes Check the pin 1of CN401 Voltage 3V Check the circuit related to U601 Phone can t access SIM Card Check the SIM connector s connection to SIM Card Check the circuit around U601 output and Voltage supply circuitry Check the circuit aroun...

Page 18: ...he pin 17 18 of CN303 TA is 5V Check the pin 4 of U601 low No No Check the U601 Yes Check the pin 3 of Q601 low No Check the Q601 Check the pin 5 of U602 3 2V 4 2V No Check the U602 Yes Yes Microphone does not work check the soldering status of microphone Resolder microphone Check the reference voltage on mic path C444 1 5V Resolder or Change C477 C478 R427 Is microphone OK change microphone END Y...

Page 19: ...ck the soldering status of speaker inside LCD module Resolder of speaker s wire Check C430 C431 Resolder of C430 C431 Audio Signal passes through this capacitor Check R403 R404 Resolder of C430 C431 Audio Signal passes through this capacitor END Yes Yes Yes No No No Can you see any audio signal from C430 C431 Yes No This is the defect of E Gold Change E Gold ...

Page 20: ... status of the LED PAD Back Light Menu4 4 1 Short or Long mode in the menu Backlight turn on Check the pin 11 of 16 CN302 High 2 6V Backlight turn on Check the pin 3 of 16 LCD CON High 2 6V Check the soldered status of the LED PAD Solder the LED again or Replace the LED Select backlight Short or Long mode Check the LCD Connector Replace the FPCB Change LCD Module Back Light dose not work Yes No Ye...

Page 21: ...leshooting and Circuit Diagrams 8 Alert Tone Abnormal Alert tone Alert tone On by pushing the key 0289 Check the PIN 13 14 of CN302 Is there alert wave Check the connection from CN302 to the NAND of Speaker Alert is ok END Check the circuit related to U303 Change LCD module Change Speaker ...

Page 22: ...oltage at 7 19 26 30 38 39 pin of U201 2 6 2 9V Check the Pin connection VRF1 Between 7 19 26 30 38 39 pin of U201 and 31 pin of U601 Check Voltage 2 6 2 9 at 4 pin of OSC202 Resolder or Replace the F204 L204 C228 C234 L218 Check IF 360MHz Level Both Side at L209 40dBm and Almost Same Level Check the Baseband Level Vpp 1V at 8 9 10 11pin of U201 Check the 2nd Local Frequency 1440MHz on beside the ...

Page 23: ... U103 PIN16 0 0 5 U103 CHECK CHANGE F103 CHECK CHANGE U101 PIN2 0 0 5V PIN11 2 5 2 8V U101 CHECK CHANGE NO NO YES YES NO NO NO NO OSC202 PIN4 2 8V OSC202 CHECK CHANGE U601 CHECK CHANGE NO NO YES OSC201 PIN7 2 8V OSC201 CHECK CHANGE U601 CHECK CHANGE YES NO NO OSC101 PIN6 9 dBm 902 4 MHz F105 CHECK CHANGE NO NO YES OSC101 PIN5 2 8V OSC101 CHECK CHANGE U601 CHECK CHANGE NO YES BATTERY CHECK CHANGE N...

Page 24: ...in of U201 2 6 2 9V Check the Pin connection VRF1 Between 7 19 26 30 38 39 pin of U201 and 31 pin of U601 Check Voltage 2 6 2 9 at 4 pin of OSC202 Having Some Defect at B d Need To send to Korea Resoder or Replace the OSC202 R226 L206 Resolder or Replace the F204 L204 C228 C234 L218 Check IF 360MHz Level Both Side at L209 40dBm and Almost Same Level Check the Baseband Level Vpp 1V at 8 9 10 11pin ...

Page 25: ...2 1 4V U103 PIN16 2 5V U103 CHECK CHANGE F103 CHECK CHANGE U101 PIN2 2 5 2 8V PIN11 0 0 5V U101 CHECK CHANGE NO NO YES YES NO NO NO NO OSC202 PIN4 2 8V OSC202 CHECK CHANGE U601 CHECK CHANGE NO NO YES OSC201 PIN7 2 8V OSC201 CHECK CHANGE U601 CHECK CHANGE YES NO NO OSC101 PIN10 5 dBm 1747 4 MHz F105 CHECK CHANGE NO NO YES OSC101 PIN5 2 8V OSC101 CHECK CHANGE U601 CHECK CHANGE NO YES BATTERY CHECK C...

Page 26: ...3 F104 GND 1 GND 2 4 IN 3 27PF C122 10UF C130 10V C105 27PF R118 0 VSS VSS 11 VSS 13 14 VSS VSS 15 16 VSS 2 _VINT PU 3 VCD VCG1 7 VDAC VDD 10 VS 14 VS 25 6 VS S 12 U102 BS 9 8 C125 27PF L105 C113 33PF 27PF C131 3 G1 4 G2 G3 5 6 G4 1 IN 2 OUT 1UF C132 CON101 VRF1 R114 C123 27PF R113 1K 1 5nH 1K GND9 17 GSMIN 4 GSMOUT 10 VCC1 6 8 VCC2 L104 GND16 24 3 GND2 5 GND3 GND4 7 GND5 91 1 GND6 GND7 13 15 GND8...

Page 27: ...0 VCC6 VCCVCXO 2 VCXO 48 39 MO X OS W 21 5 PLLO N REFR 6 34 RX1 RX1 X 33 36 RX2 32 RX3 43 IFIX LNAGAI N 42 LNAON 27 22 LO 1 LO1X 23 MIXI 29 28 MIXIX MO 38 18 FL 3 FSY S 1 GND GND 12 24 GND 37 GND GNDLNA 35 IF I 44 CLK 13 20 CPLO 1 41 CPLO 2 CPT X 25 14 DA 16 EFI L EFILX 17 EN 15 U201 A 8 9 AX B 10 BS W 4 11 BX NC L210 L203 27nH C215 100NF R216 C209 27PF 10UF C249 6 8K VRF1 R206 0 VRF1 27PF C214 15...

Page 28: ...V3V R340 20K ZD304 A2 B2 A3 B3 A1 B1 V3V 22PF C318 VBA T 1U F C301 100K R305 10NF C389 VBA T _S W E B8 VBA T D4 _F RST C4 _F RY B Y _F W E C3 _F W P E3 G 1 0 _S CE1 _S LB F3 _S O E F5 F4 _S U B S A17 C6 S CE2 D8 S VCC D9 T1 D5 T2 D6 T3 E7 _F C E H7 _F O E H9 NC A1 A2 NC NC H1 H2 NC NC H3 F6 NC NC A10 A11 NC GND D3 A9 GND GND H8 NC C5 NC A12 H10 NC NC H11 H12 NC DQ8 F8 F7 DQ9 E4 E VPP G 4 F A17 F A...

Page 29: ...1 4 CC02IO RF 0 E10 CC06I O CCI N L6 M10 CCI O L9 CCIOSW M9 CCLK CCRS T L7 CCVZQ L10 CLKOUT PC 0 R6 CLKXM A21 B4 CS0Q A14 A13 B13 A7 A8 A12 B12 A9 AF C R3 G 4 AGND BHEQ E7 BREF K4 N2 BTEC CC00IO PC 2 N7 CC01IO PE 2 M1 1 E9 B8 A15 A16 A7 B7 A17 A18 A6 B6 A19 A2 D1 5 A20 A4 D1 4 A3 A4 C15 C14 A5 A6 A0 F15 F14 A1 A10 A10 B10 A11 A12 A9 B9 A13 A14 A8 U401 DATA_DET1 C44 6 NC RESET C450 27P F VANA VBA T...

Page 30: ...EY0 7 1 2 KEY21 1 2 KEY1 1 1 2 KEY05 1 2 24 R50 1 ZD50 2 1 2 3 4 5 6 U603 BYP 4 CT L 3 2 GND 1 VIN 5 VOUT R526 180 R525 180 180 R524 AGND 180 R521 1 2 LED14 LED50 5 KEY0 8 1 2 KEY18 1 2 NC KEY0 1 R512 AGND C504 LED50 6 180 LED50 4 KEY1 3 1 2 LED50 9 2 KEY14 1 2 Q506 1 3 C502 100NF S3 R506 51K LED50 2 220 R569 LED51 2 C503 470PF 3 GND OUT 2 VCC1 C501 10U F 6 3V R531 U501 R530 180 180 R52 9 180 KEY0...

Page 31: ...SD VSSD 40 VSSP W 10 27 VSSR RESET 17 10UF VDDPW 8 35 VDDRF VINT 24 VRF 1 31 VRF 2 37 36 VRF 3 VRT C 30 21 VSIM VANA 3 6 VBAT S VCHC 4 5 VCHS VCXOE N 38 39 VDDA 23 VDDB 7 VDDCH 18 FB 14 INTOUT 29 IREF 19 ON 15 SC L SD A 16 SW 9 22 V3V 10UF U601 BYP 28 VSENSE C602 U602 DRIVE 6 GND 2 1 ISENSE PROG 4 3 VCC 5 C63 4 1U F 1K VBA T R61 1 2 7K R610 47K R609 2 2UF C610 C611 2 2UF C613 100NF C617 2 NE G 1 P...

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