Samsung SGH-X481 Service Manual
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Samsung SGH-X481 Service Manual

Samsung SGH-X481 Service Manual

Gsm telephone
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GSM TELEPHONE
GSM TELEPHONE
SGH-X481
CONTENTS
1.
Specification
2.
Flow Chart of Troubleshooting
3.
Exploded View and Parts List
4.
Electrical Parts List
5.
PCB Diagrams
6.
Block Diagrams
7.
Disassembly and
Assembly instructions

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Summary of Contents for Samsung SGH-X481

  • Page 1 GSM TELEPHONE SGH-X481 GSM TELEPHONE CONTENTS Specification Flow Chart of Troubleshooting Exploded View and Parts List Electrical Parts List PCB Diagrams Block Diagrams Disassembly and Assembly instructions...

  • Page 2: Specification

    1. SGH-X481 Specification 1-1. GSM General Specification GSM900 E G S M 9 00 DCS1800 PC S1 90 0 Ph ase 1 Ph ase 2 Ph ase 1 Freq. Ban d [M Hz ] 89 0~ 91 5 88 0~ 91 5...

  • Page 3: Gsm Tx Power Class

    SGH-X481 Speclflcation 1-2. GSM Tx Power Class TX Power TX Power TX Power GSM900 DCS1800 PCS1900 control level control level control level 33±2 dBm 30±3 dBm 30±3 dBm 31±2 dBm 28±3 dBm 28±3 dBm 29±2 dBm 26±3 dBm 26±3 dBm 27±2 dBm...

  • Page 4: Flow Chart Of Troubleshooting

    Flow Chart of Troubleshooting 2. SGH-X481 1. Baseband 2-1-1. Power ON 'Power ON' does not work check the current consumption Download again >= 100mA Check the Voltage of the Battery Charge the battery >= 3.3V Check the pin C101, Check C102,C103 of U100 "Power On"...
  • Page 5 SGH-X481 Flow Chart of Troubleshooting...
  • Page 6 SGH-X481 Flow Chart of Troubleshooting 2-1-2. Initial Initial Failure check the pin RSTB of U600 is Check U600 LOW? Check check the pin CKI of U600 is 13Mhz? R800,R801,C811,R803 Check the clock check signal at pin #3 of OSC600 OSC600...
  • Page 7 SGH-X481 Flow Chart of Troubleshooting...

  • Page 8: Sim Part

    SGH-X481 Flow Chart of Troubleshooting 2-1-3. Sim Part "Insert SIM" is displayed on the LCD The voltage is 2.8V Check the U100 at the pin#1 of CN100 Is there any signal Check the U100 & U600 pin #2,3,4 of CN100?
  • Page 9 SGH-X481 Flow Chart of Troubleshooting...

  • Page 10: Microphone Part

    SGH-X481 Flow Chart of Troubleshooting 2-1-4.Microphone Part * Call with Sim before testing. MicroPhone does not work Check the soldered Resolder microphone status of microphone Check the reference Resolder or change C423 voltage on mic path R418 ≒ 2.0V Is microphone OK?
  • Page 11 SGH-X481 Flow Chart of Troubleshooting...

  • Page 12: Speaker Part

    SGH-X481 Flow Chart of Troubleshooting 2-1-5. Speaker Part There is no sound from speaker Check the connection status of LCD connector reconnect CN200 CN200 Are there any signal at the speaker pad on LCD Replace the speaker module PCB? Check R402, R403 of Check U500 U402.
  • Page 13 SGH-X481 Flow Chart of Troubleshooting 2-10...

  • Page 14: Lcd Backlight

    SGH-X481 Flow Chart of Troubleshooting 2-1-6. LCD backlight Backlight does not work Backlight ON "TIME" Select backlight "15 sec" mode mode in the menu? Check conecting between PBA and LCD Check FPCB conector Check U200 pin #8 = Check the LCD...
  • Page 15 SGH-X481 Flow Chart of Troubleshooting 2-2. RF 2-2-1. GSM Rx CONTINOUS RX ON RF INPUT : 62CH AMP : -60dbm Normal condition Check ANT, C824,C825,C904,C903 catch the channel ? Check U900 Resolder or change pin 12 ≥ -65 CON901, C903, L903, L904, C901, C902...
  • Page 16 SGH-X481 Flow Chart of Troubleshooting 2-13...
  • Page 17 SGH-X481 Flow Chart of Troubleshooting 2-2-2. DCS Rx CONTINOUS RX ON RF INPUT : 698CH AMP : -60dbm Normal condition catch the Check ANT,C822,C823,L802 channel ? Check U900 Resolder or change pin 12 ≥ -65 CON901, C903, L903, L904, C901, C902...
  • Page 18 SGH-X481 Flow Chart of Troubleshooting 2-15...
  • Page 19 SGH-X481 Flow Chart of Troubleshooting 2-2-3. PCS Rx CONTINOUS RX ON RF INPUT : 660CH AMP : -50dbm Normal condition catch the Check ANT,C820,C821,L801 channel ? Check U900 Resolder or change pin 12 ≥ -65 CON901, C903, L903, L904, C901, C902...
  • Page 20 SGH-X481 Flow Chart of Troubleshooting 2-17...
  • Page 21 SGH-X481 Flow Chart of Troubleshooting 2-18...
  • Page 22 SGH-X481 Flow Chart of Troubleshooting 2-2-4. GSM Tx CONTINUS TX ON CONDITION TX POWER DAC : 554 CODE Check U801 Check and Check U801 APPLIED pin 15 : about change pin 6 : 2.8V ? CH : 62ch 2~3 dbm?
  • Page 23 SGH-X481 Flow Chart of Troubleshooting 2-20...
  • Page 24 SGH-X481 Flow Chart of Troubleshooting 2-2-5. DCS/PCS Tx CONTINUS TX ON CONDITION TX POWER DAC : 560 CODE Check U801 Check and APPLIED Check U801 pin 15 : about change CH : 698CH(DCS), pin 6 : 2.8V ? 2~3 dbm?
  • Page 25 SGH-X481 Flow Chart of Troubleshooting 2-22...

  • Page 26: Cellular Phone Exploded View

    3. SGH-X481 Exploded View and its Parts list 3-1. Cellular phone Exploded View QFU01 QLC01 QME03 QSP01 QMO01 QFR01 QRF03 QSC14 QVO01 QMI03 QFL01 QIF01 QHI01 QCR04 QKP01 QSC05 QSC08 QME01 QMW02 QMI01 QVK01 QMP01 QAN11 QAN02 QRE01 QCR04 QRF01...

  • Page 27: Cellular Phone Parts List

    GH72-19086A QFL01 　 MEC-FOLDER LOWER GH75-06164A 　 QHI01 MEC-HINGE(CAN TYPE) GH75-04662A QFR01 　 ASSY-CASE-FRONT GH98-00746A QMI03 RMO-MIC HOLDER GH73-04031A 　 　 QRF03 PMO-EAR COVER GH72-19072A SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
  • Page 28 GH74-13626A MPR-TAPE PBA EMI GH74-13732A MPR-TAPE J TAG GH74-13733A MPR-TAPE PBA GLD SHEET A GH74-13963A MPR-TAPE CAM CON LCD GH74-20645A MPR-TAPE EMI PBA 3 GH74-21767A SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
  • Page 29 3-3. Test Jig (GH80-03304A) 3-3-1. RF Test Cable 3-3-2. DATA CABLE 3-3-3. Serial Cable (GH39-00283A) (GH39-00127A) 3-3-4. Power Supply Cable 3-3-5. Test Cable 3-3-6. TA (GH39-00304A) (GH44-00954A) SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...

  • Page 30: Electrical Parts List

    2503-001041 C302 C-CER,CHIP 2203-000854 C303 C-TA,CHIP 2404-001415 C401 C-CER,CHIP 2203-000940 C402 C-TA,CHIP 2404-001415 C403 C-CER,CHIP 2203-002709 C404 C-CER,CHIP 2203-002709 C405 C-CER,CHIP 2203-006091 C407 C-CER,CHIP 2203-002709 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
  • Page 31 2203-000254 C612 C-CER,CHIP 2203-000254 C613 C-CER,CHIP 2203-000254 C615 C-CER,CHIP 2203-006626 C618 C-CER,CHIP 2203-006260 C619 C-CER,CHIP 2203-000330 C620 C-CER,CHIP 2203-000330 C702 C-CER,CHIP 2203-006324 C703 C-CER,CHIP 2203-006048 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
  • Page 32 2911-000030 L201 INDUCTOR-SMD 2703-002339 L301 BEAD-SMD 3301-001659 L401 INDUCTOR-SMD 2703-002202 L402 INDUCTOR-SMD 2703-002202 L701 BEAD-SMD 3301-001729 L801 INDUCTOR-SMD 2703-002544 L802 INDUCTOR-SMD 2703-002544 L803 INDUCTOR-SMD 2703-002558 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
  • Page 33 2007-000566 R304 R-CHIP 2007-000566 R305 R-CHIP 2007-000140 R306 R-CHIP 2007-000140 R307 R-CHIP 2007-000140 R308 R-CHIP 2007-000140 R309 R-CHIP 2007-001319 R310 R-CHIP 2007-000140 R311 R-CHIP 2007-000140 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
  • Page 34 2007-000159 R602 R-CHIP 2007-000157 R603 R-CHIP 2007-007142 R604 R-CHIP 2007-007573 R605 R-CHIP 2007-007573 R607 R-CHIP 2007-000162 R608 R-CHIP 2007-000157 R609 R-CHIP 2007-000162 R617 R-CHIP 2007-000162 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
  • Page 35 U900 IC-POWER AMP 1201-002218 U901 DIODE-TVS 0406-001190 U902 C-CER,CHIP 2203-000254 U903 R-CHIP 2007-007480 V205 VARISTOR 1405-001082 V207 VARISTOR 1405-001110 V307 VARISTOR 1405-001093 V401 VARISTOR 1405-001108 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
  • Page 36 1405-001082 VR708 VARISTOR 1405-001082 VR709 VARISTOR 1405-001082 VR710 VARISTOR 1405-001082 VR711 VARISTOR 1405-001082 ZD302 DIODE-ZENER 0403-001547 ZD304 DIODE-TVS 0406-001190 ZD305 DIODE-TVS 0406-001190 ZD306 DIODE-TVS 0406-001190 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
  • Page 37 SGH-X481 Main Electrical Parts List SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...

  • Page 38: Pcb Diagrams

    5. SGH-X481 PCB Diagrams SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...
  • Page 39 SGH-X481 PCB Diagrams SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...

  • Page 40: Block Diagrams

    6. SGH-X481 Block Diagrams SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization...

  • Page 41: Disassembly And

    1) Be care of scratch and molding damage. 1) When we disjoint the Front, be care of body transformation. 1) Be care of scratch. SAMSUNG Proprietary-Contents may change Without notice This Document can not be used without Samsung's authorization...
  • Page 42 1) Be care of scratch and molding damage. 1) Remove the 'tape con to con' and separate the 'con to con' from LCD module. 1) Be care of scratch and molding damage. SAMSUNG Proprietary-Contents may change Without notice This Document can not be used without Samsung's authorization...
  • Page 43 1) When we disjoint the Front, be care of body transformation. 1) Be care of scratch and molding damage. Especially FPCB of 'con to con' SAMSUNG Proprietary-Contents may change Without notice This Document can not be used without Samsung's authorization...
  • Page 44 1) Be care of scratch and molding damage. 2) Verify the direction of side key 1) Fasten screws this four point of rear cover. 1) Be care of scratch and molding damage. SAMSUNG Proprietary-Contents may change Without notice This Document can not be used without Samsung's authorization...
  • Page 45 ※ Caution ※ Caution 1. Verify the model name, SGH-X481 in 'con to 1. Be careful of LCD damage while using pinset. con' 1. inspect the outside of LCD Module. ※ Caution 1.
  • Page 46 SGH-X481 Disassembly and Assembly instructions SAMSUNG Proprietary-Contents may change Without notice This Document can not be used without Samsung's authorization...
  • Page 47 ⓒ This Service Manual is a property of Samsung Electronics Co.,Ltd. Samsung Electronics Co.,Ltd. Any unauthorized use of Manual can be punished under applicable International and/or domestic law. Code No.:GH68-11385A 2006. 05. Rev.1.0...

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