Samsung SGH-A408 Service Manual
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Samsung SGH-A408 Service Manual

Samsung SGH-A408 Service Manual

Dual band gsm telephone
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SERVICE
DUAL BAND GSM TELEPHONE
DUAL BAND GSM
TELEPHONE
SGH-A408
Manual
CONTENTS
1. Exploded Views and Parts List
2. Electrical Parts List
3. Block Diagrams
4. PCB Diagrams
5. Flow Chart of Troubleshooting and
Circuit Diagram

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  • Page 1 DUAL BAND GSM TELEPHONE SGH-A408 SERVICE Manual DUAL BAND GSM TELEPHONE CONTENTS 1. Exploded Views and Parts List 2. Electrical Parts List 3. Block Diagrams 4. PCB Diagrams 5. Flow Chart of Troubleshooting and Circuit Diagram...

  • Page 2: Table Of Contents

    1. SGH-A408 Exploded Views and Parts List 1-1. GSM Telephone Exploded View 1-2. GSM Telephone Parts List 1-3. Travel Adapter 1-4. STravel Adapter Parts List 1-5. Cigarette Lighter Adaptor 1-6. Cigarette Lighter Adapter Parts List 1-7. Test Jig 1-7-1. Test Jig Cable 1-7-2.
  • Page 3 1. SGH-A408 Exploded View and its Parts List 1-1. GSM Telephone Exploded View SAMSUNG Proprietary-Contents may change without notice...

  • Page 4: Gsm Telephone Parts List

    SGH-A408 Exploded view and its Part List 1-2. GSM Telephone Parts List DESCRIPTION SEC.CODE REMARK MEC-FOLDER UPPER GH75-01450A LCD ASS’Y GH07-00102A SPEAKER ASS’Y GH59-00239A VIBRATOR ASS’Y GH31-00030A SHIELD NET GH74-01653A FPCB GH59-00242A HINGE HOLDER ASS’Y GH75-01109C MEC-FOLDER LOWER GH75-01201F WINDOW-LCD...

  • Page 5: Travel Adapter

    SGH-A408 Exploded view and its Part List 1-3. Travel Adapter 1-4. Travel Adapter Parts List TYPE SEC CODE REMARK GH44-00171A CHINA (SGH-A408) GH44-00184A EUROPE GH44-00171C UNITED KINGDOM Gh44-00171E TAIWAN SAMSUNG Proprietary-Contents may change without notice...

  • Page 6: Cigarette Lighter Adaptor

    SGH-A408 Exploded view and its Part List 1-5. Cigarette Lighter Adaptor 1-6. Cigarette Lighter Adapter Parts List DESCRIPTION SEC CODE REMARK Cigarette Lighter Adapter Code GH44-00195A BLACK SAMSUNG Proprietary-Contents may change without notice...

  • Page 7: Test Jig

    SGH-A408 Exploded view and its Part List 1-7. Test Jig (GH80-00161A) 1-7-1. Test Jig Cable 1-7-2. RF Jig Cable (GH39-00096A) (GH39-00093A) SAMSUNG Proprietary-Contents may change without notice...
  • Page 8 SGH-A408 Exploded view and its Part List 1-7-3. Test Jig SAMSUNG Proprietary-Contents may change without notice...
  • Page 9 2. SGH-A408 Electrical Parts List Level SEC CODE REFERENCE DESCRIPTIONS Remark GH92-01228A 4302-001119 BAT200 BATTERY-LI(2ND) 3 V, 0.1MAH, -, -, 3.1 V, - 2203-000311 C100 C-CERAMIC, CHIP 0.12 nF, 5 %, 50 V, NP0, TP, 2203-005065 C101 C-CERAMIC, CHIP 1000 nF, +80-20 %, 10 V, Y5 V, TP,...
  • Page 10 C-CERAMIC, CHIP 390 pF, 10 %, 50 V, X7R, TP, - 2203-005481 C332 C-CERAMIC, CHIP 47 nF, 10 %, 10 V, X7R, TP, - 2203-005664 C333 C-CERAMIC, CHIP 4700 nF, 10 %, 6.3 V, X5R, TP, 2012 SAMSUNG Proprietary-Contents may change without notice...
  • Page 11 C-CERAMIC, CHIP 0.1 nF, 5 %, 50 V, NP0, TP, 2203-000438 C501 C-CERAMIC, CHIP 1 nF, 10 %, 50 V, X7R, TP, - 2203-000812 C503 C-CERAMIC, CHIP 0.033 nF, 5 %, 50 V, NP0, TP, SAMSUNG Proprietary-Contents may change without notice...
  • Page 12 C-CERAMIC, CHIP 0.022 nF, 5 %, 50 V, NP0, TP, 2203-000278 C547 C-CERAMIC, CHIP 0.01 nF, 0.5 pF, 50 V, NP0, TP, 2203-001432 C548 C-CERAMIC, CHIP 47 nF, +80-20 %, 16 V, Y5 V, TP, SAMSUNG Proprietary-Contents may change without notice...
  • Page 13 C-CERAMIC, CHIP 0.033 nF, 5 %, 50 V, NP0, TP, 2203-000812 C639 C-CERAMIC, CHIP 0.033 nF, 5 %, 50 V, NP0, TP, 2203-000812 C640 C-CERAMIC, CHIP 0.033 nF, 5 %, 50 V, NP0, TP, SAMSUNG Proprietary-Contents may change without notice...
  • Page 14 FILTER-SAW 400MHZ, .28MHZ, +-70KHZ, TP, 6.5DB, - 2904-001096 F500 FILTER-SAW 1.8425GHz, 75MHz, +-37.5MHz/2.5dB, 2904-001281 F501 FILTER-SAW 947.5MHz, 25MHz, +-12.5MHz/1.4dB, 2007-007771 F502 R-CHIP 0 ohm, 5 %, 1/16 W, DA, TP, 2703-000310 L100 INDUCTOR-SMD 1.8 uH, 10 %, 0.8x1.6x0.8mm SAMSUNG Proprietary-Contents may change without notice...
  • Page 15 Q601 TR-SMALL SIGNAL 2SB1427, PNP, 500 mW, SOT-89, 0501-002356 Q603 TR-SMALL SIGNAL -, NPN, 250 mW, SOT-323, TP, 0504-001012 Q604 TR-DIGITAL DTC114YE, NPN, 150 mW, 10K/47K, 0504-001012 Q605 TR-DIGITAL DTC114YE, NPN, 150 mW, 10K/47K, SAMSUNG Proprietary-Contents may change without notice...
  • Page 16 R-CHIP 4.7 kohm, 1 %, 1/16 W, DA, TP, 2007-000172 R315 R-CHIP 10 ohm, 5 %, 1/16 W, DA, TP, 2007-001298 R316 R-CHIP 51 ohm, 5 %, 1/16 W, DA, TP, 2007-000172 R317 R-CHIP 10 ohm, 5 %, 1/16 W, DA, TP, SAMSUNG Proprietary-Contents may change without notice...
  • Page 17 R-CHIP 1 Mohm, 5 %, 1/16 W, DA, TP, 2007-007771 R526 R-CHIP 0 ohm, 5 %, 1/16 W, DA, TP, 2007-007095 R527 R-CHIP 390 ohm, 5 %, 1/16 W, DA, TP, 2007-000139 R528 R-CHIP 220 ohm, 5 %, 1/16 W, DA, TP, SAMSUNG Proprietary-Contents may change without notice...
  • Page 18 U330 IC-CMOS LOGIC 7WZ08, 2-INPUT AND GATE, US8, 1203-001703 U400 IC-VOLTAGE REGULATOR 20436, TQFP, 48P, 275MIL, , 1203-002099 U401 IC-VOLTAGE REGULATOR 5245, SOT-23-5, 5P, 64MIL, 0504-001042 U500 TR-DIGITAL BCR10PN, NPN/PNP, 250 mW, 10K/10K, SAMSUNG Proprietary-Contents may change without notice 2-10...
  • Page 19 DIODE-SCHOTTKY RB705D, 20 V, 30 mA, SOT-23, TP 0406-001104 ZD602 DIODE-TVS ESDA6V1-5W6, 6.1/-/7.2 V, 100 W, 0406-001104 ZD604 DIODE-TVS ESDA6V1-5W6, 6.1/-/7.2 V, 100 W, 0406-001104 ZD605 DIODE-TVS ESDA6V1-5W6, 6.1/-/7.2 V, 100 W, GH41-00206A PCB-SGHA400 SGH-A408 , FR-4, 6L, -, 0.8T, SAMSUNG Proprietary-Contents may change without notice 2-11...
  • Page 20 3. SGH-A408 Block Diagrams 3-1. Main Block Diagram SAMSUNG Proprietary-Contents may change without notice...
  • Page 21 SGH-A408 Block Diagrams 3-2. Main RF Block Diagram SAMSUNG Proprietary-Contents may change without notice...
  • Page 22 SGH-A408 Block Diagrams 3-2-1. RF Receive Part Block Diagram SAMSUNG Proprietary-Contents may change without notice...
  • Page 23 SGH-A408 Block Diagrams 3-2-2. RF Transmit Part Block Diagram SAMSUNG Proprietary-Contents may change without notice...
  • Page 24 U 8 0 2 2 Z D 6 0 4 C 5 1 3 U 5 0 6 C301 L507 L 5 0 1 C 5 1 6 L305 C 3 0 0 C522 C 5 2 6 SAMSUNG Proprietary-Contents may change without notice...
  • Page 25 SGH-A408 PCB Diagrams 4-2. Main PCB Bottom Diagram LED600 Q603 C669 C606 C602 D200 C634 CN601 C613 F300 Q201 U603 C635 Q600 U500 Q500 OSC300 C621 C615 U501 U502 C544 CN400 U510 LAM1 SAMSUNG Proprietary-Contents may change without notice...

  • Page 26: Circuit Diagram

    5.SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 5-1. Power ON ‘POWER ON’ does not work Check the current Download again consumption more than 100 mA Check the Charge the Battery Battery Voltage more than 3.3V Check the pin Check to the path from CN604 to pin...
  • Page 27 SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 5-2. Initial Initial Failure Check the “Reset_B” Check the U100 (IA) signal at the pin 6 of U330-1 is “High” Check the pin 10 Check the U201 (M46) of U400 is “High”...

  • Page 28: Sim Part

    SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 5-3. Sim Part Phone can’t access SIM card Check the pin 1, 5 of Check the SIM related circuit of the U400 CN400. voltage is 2.8V ? Check the SIM connector’s CN400...

  • Page 29: Charging Part

    SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 5-4. Charging Part Abnormal charging part Check the pin 17, 18 of CN604-1 Replace TA is around 5V Check the U201 Check the pin 2 of U8021 using Factory Test Program is “Low”...

  • Page 30: Microphone Part

    SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 5-5. Microphone Part Micro Phone does not work check the connection Change MIC600 from MIC600 Audio loopback is enabled by board test Resolder R104, R107, R103 program. R104, R107 2.2 V Mic_Bias...

  • Page 31: Speaker Part

    SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 5-6. Speaker Part Speaker does not work Check the connection between CN601 and LCD Module connector Check the connection from CN601 Replace Flexible PCB to LCD Module Check the voltage on the speaker...

  • Page 32: Key Data Input

    SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 5-7. Key Data Input Check initial operation Check the connection between CN602 and Keypad. Check the pin 1, 3, 4, of CN602 is Check the M46(U201) “High” When one of the keys is...

  • Page 33: Ring Indicator

    SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 5-8. Ring Indicator Ring Indicator does not work Check the connection between CN602 and Keypad. Check M46(U201) Check the Q203 pin 2 is by Factory Test Program “High” Check the Q203 pin 3 is Replace Q203 “Low”...

  • Page 34: Back Light

    SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 5-9. Back Light Backlight does not work Check the connection between CN601 and LCD Module. Backlight “ON” mode in Select backlight “ON” mode the menu ? Check M46(U201) CN601 pin 3 = “High” ?

  • Page 35: Alert Tone

    SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 5-10. Alert Tone Abnormal Alert tone Is there alert wave signal on the ALERT by Test S/W R635 during alert tone test? Is there alert wave signal on the Check the circuit related to Q603...

  • Page 36: Gsm Receiver

    SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 5-11. GSM Receiver RX On RF input : 62 CH Amp. : -50 dBm U505 Resolder or Change CN500 Pin 9 -65 dBm Check voltage U505 pins U505 Pin 2 : L Resolder&...
  • Page 37 SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram Test Condition of RF Bench Test SAMSUNG Proprietary-Contents may change without notice 5-12...
  • Page 38 SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram RX_62_U505 PIN9 RX_62_U505 PIN5 SAMSUNG Proprietary-Contents may change without notice 5-13...
  • Page 39 SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram RX_62_F501 PIN5 RX_62_U507 PIN16 SAMSUNG Proprietary-Contents may change without notice 5-14...
  • Page 40 SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram RX_62_F301 PIN1 RX_62_F300 PIN1 SAMSUNG Proprietary-Contents may change without notice 5-15...
  • Page 41 SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram RX_62_F300 PIN4 U300_ PIN26 SAMSUNG Proprietary-Contents may change without notice 5-16...

  • Page 42: Gsm Transmit

    SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 5-12. GSM Transmit Tx On (level : 5) Battery voltage : 3.8 V Using 20 dB Attenuator U505 Resolder Pin 9 CN500 30 dBm Check voltage U505 Pin 2 : H Resolder or Change...
  • Page 43 SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram Test Condition of RF Bench Test SAMSUNG Proprietary-Contents may change without notice 5-18...
  • Page 44 SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram TX_62_U505 PIN9 TX_62_U505 PIN1 SAMSUNG Proprietary-Contents may change without notice 5-19...
  • Page 45 SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram TX_62_lam1 PIN3 TX_62_U510 PIN4 SAMSUNG Proprietary-Contents may change without notice 5-20...

  • Page 46: Dcs Receiver

    SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 5-13. DCS Receiver RX On RF input : 698 CH Amp. : -50 dBm U505 Resolder or Change CN500 Pin 9 -65 dBm Check voltage U505 pins U505 Resolder & U505 Pin 2 : L...
  • Page 47 SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram Test Condition of RF Bench Test SAMSUNG Proprietary-Contents may change without notice 5-22...
  • Page 48 SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram RX_698_U505 PIN9 RX_698_U505 PIN7 SAMSUNG Proprietary-Contents may change without notice 5-23...
  • Page 49 SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram RX_698_F500 PIN5 RX_698_U507 PIN16 SAMSUNG Proprietary-Contents may change without notice 5-24...
  • Page 50 SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram RX_698_F301 PIN1 RX_698_F300 PIN1 SAMSUNG Proprietary-Contents may change without notice 5-25...
  • Page 51 SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram RX_698_F300 PIN4 U300_ PIN26 SAMSUNG Proprietary-Contents may change without notice 5-26...

  • Page 52: Dcs Transmit

    SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram 5-14. DCS Transmit Tx On (level : 0) Battery voltage : 3.8 V Using 20 dB Attenuator U505 Resolder Pin 9 CN500 25 dBm Check voltage U505 Pin 2 : L Resolder or Change...
  • Page 53 SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram Test Condition of RF Bench Test SAMSUNG Proprietary-Contents may change without notice 5-28...
  • Page 54 SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram TX_698_U505 PIN9 TX_698_U505 PIN11 SAMSUNG Proprietary-Contents may change without notice 5-29...
  • Page 55 SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram TX_698_lam1 PIN1 TX_698_U510 PIN2 SAMSUNG Proprietary-Contents may change without notice 5-30...
  • Page 56 ELECTRONICS ©Samsung Electronics Co.,Ltd. November. 2001 Pinted in Korea. Code No.: GH68-02384A BASIC.

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