Service Manual
Page 1
Safety Precautions 2. Array course control 5. Specification 3. Operation Instruction and Installation 4. MAIN Electrical Parts List 7. Flow Chart of Troubleshooting 10. GSM TELEPHONE SGH-D900i GSM TELEPHONE CONTENTS 1. PCB Diagrams 9. Exploded View/Disassembly and Assembly Instructions 6. Block Diagrams 8. Reference data
Safety Precautions 2. Array course control 5. Specification 3. Operation Instruction and Installation 4. MAIN Electrical Parts List 7. Flow Chart of Troubleshooting 10. GSM TELEPHONE SGH-D900i GSM TELEPHONE CONTENTS 1. PCB Diagrams 9. Exploded View/Disassembly and Assembly Instructions 6. Block Diagrams 8. Reference data
Service Manual
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Yes No Check the +VDD_GSM_CORE circuit Check the initial operation Yes END 9-1 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization Power On ' Power On ' does not work Yes Check the Battery Voltage is more than 3.4V Yes C419(VISA) = 2.7V? Yes No Change the Battery No Check the PMU related to VINT Check the Clock at R404=32KHZ Yes C40(+VDD_IO_LOW) & C403(+VDD_IO_HIGH) = "H"? 9. Flow Chart of Troubleshooting 9-1. Yes No Resolder OSC400 No Check the related circuit C204(+VDD_GSM_CORE) = 1.8V?
Yes No Check the +VDD_GSM_CORE circuit Check the initial operation Yes END 9-1 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization Power On ' Power On ' does not work Yes Check the Battery Voltage is more than 3.4V Yes C419(VISA) = 2.7V? Yes No Change the Battery No Check the PMU related to VINT Check the Clock at R404=32KHZ Yes C40(+VDD_IO_LOW) & C403(+VDD_IO_HIGH) = "H"? 9. Flow Chart of Troubleshooting 9-1. Yes No Resolder OSC400 No Check the related circuit C204(+VDD_GSM_CORE) = 1.8V?
Service Manual
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Flow Chart of Troubleshooting 9-2 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization
Flow Chart of Troubleshooting 9-2 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization
Service Manual
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Initial Initial Failure Yes U200 pin C11 (RSTON) ="H"? Yes Check the 16bit data signal & memory CE Yes END Flow Chart of Troubleshooting No Check the circuit related to reset No change U200 9-3 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization 9-2. OK? Yes U200 pin F1(RSTEXTn) ="H"?
Initial Initial Failure Yes U200 pin C11 (RSTON) ="H"? Yes Check the 16bit data signal & memory CE Yes END Flow Chart of Troubleshooting No Check the circuit related to reset No change U200 9-3 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization 9-2. OK? Yes U200 pin F1(RSTEXTn) ="H"?
Service Manual
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Flow Chart of Troubleshooting 9-4 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization
Flow Chart of Troubleshooting 9-4 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization
Service Manual
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9-3. Charging Part Abnormal charging part Yes Check the U402 pin 38 > 4.9V Yes U400 pin 34(AUX_ON) = "L"? Yes Check the U402 pin 46 ≒ 1.4V Yes END Flow Chart of Troubleshooting No Check the circuit related to V_EXT_CHARGE No Check the circuit related to AUX_ON signal No Resolder or replace U402 9-5 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization
9-3. Charging Part Abnormal charging part Yes Check the U402 pin 38 > 4.9V Yes U400 pin 34(AUX_ON) = "L"? Yes Check the U402 pin 46 ≒ 1.4V Yes END Flow Chart of Troubleshooting No Check the circuit related to V_EXT_CHARGE No Check the circuit related to AUX_ON signal No Resolder or replace U402 9-5 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization
Service Manual
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Flow Chart of Troubleshooting 9-6 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization
Flow Chart of Troubleshooting 9-6 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization
Service Manual
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9-4. Yes After Power ON, Check SIMCLK Signal on pin3 of Troubleshooting No Resolder or replace U402 No Check the Clock No Replace PBA 9-7 SAMSUNG Proprietary-Contents may change without Samsung's authorization Sim Part Phone can not be used without notice This Document can 't access SIM Card Yes CN501 pin 1,5 = "H"? Yes Check the SIM Card Yes END Flow Chart of CN501 in a few second Yes After SIM card insert, CN501 pin 2 = "H(SIM_RST)"?
9-4. Yes After Power ON, Check SIMCLK Signal on pin3 of Troubleshooting No Resolder or replace U402 No Check the Clock No Replace PBA 9-7 SAMSUNG Proprietary-Contents may change without Samsung's authorization Sim Part Phone can not be used without notice This Document can 't access SIM Card Yes CN501 pin 1,5 = "H"? Yes Check the SIM Card Yes END Flow Chart of CN501 in a few second Yes After SIM card insert, CN501 pin 2 = "H(SIM_RST)"?
Service Manual
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Flow Chart of Troubleshooting 9-8 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization
Flow Chart of Troubleshooting 9-8 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization
Service Manual
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9-5. Microphone Part Microphone does not work Yes Check the connection from MIC Yes Check the circuit from U200 to MIC Yes Check the MIC Yes END Flow Chart of Troubleshooting No Resolder MIC No Resolder the C600, C603, R600, R604 No Replace the MIC 9-9 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization
9-5. Microphone Part Microphone does not work Yes Check the connection from MIC Yes Check the circuit from U200 to MIC Yes Check the MIC Yes END Flow Chart of Troubleshooting No Resolder MIC No Resolder the C600, C603, R600, R604 No Replace the MIC 9-9 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization
Service Manual
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Flow Chart of Troubleshooting 9-10 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization
Flow Chart of Troubleshooting 9-10 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization
Service Manual
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Yes U800 pin 2, 5 ≒ 1.8V? (When U800 operate) Yes CN701 pin 2,3 ≒ 1.8V? (When U800 operate) Yes Is Speaker working? Speaker Part(Melody) Speaker does not work Yes U800 pin 14 = 2.9V? Yes END Flow Chart of Troubleshooting No Resolder or replace U800 No Resolder U800 No Resolder CN701 No Change the Speaker 9-11 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization 9-6.
Yes U800 pin 2, 5 ≒ 1.8V? (When U800 operate) Yes CN701 pin 2,3 ≒ 1.8V? (When U800 operate) Yes Is Speaker working? Speaker Part(Melody) Speaker does not work Yes U800 pin 14 = 2.9V? Yes END Flow Chart of Troubleshooting No Resolder or replace U800 No Resolder U800 No Resolder CN701 No Change the Speaker 9-11 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization 9-6.
Service Manual
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Flow Chart of Troubleshooting 9-12 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization
Flow Chart of Troubleshooting 9-12 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization
Service Manual
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9-7. Key Data Input Check Initial Operation Yes When one of the keys is pushed, KBIO signal is it displayed on LCD? Yes When one of Troubleshooting No Check the Dome sheet & Key Pad No Replace the PBA 9-13 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization Yes END Flow Chart of the keys is pushed, is OK?
9-7. Key Data Input Check Initial Operation Yes When one of the keys is pushed, KBIO signal is it displayed on LCD? Yes When one of Troubleshooting No Check the Dome sheet & Key Pad No Replace the PBA 9-13 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization Yes END Flow Chart of the keys is pushed, is OK?
Service Manual
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Yes Is Receiver working ? Yes END No Resolder U200 or Change PBA No Replace the Receiver 9-14 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization Flow Chart of Troubleshooting 9-8. Receiver Part Receiver does not work Yes Is Receiver working ?
Yes Is Receiver working ? Yes END No Resolder U200 or Change PBA No Replace the Receiver 9-14 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization Flow Chart of Troubleshooting 9-8. Receiver Part Receiver does not work Yes Is Receiver working ?
Service Manual
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Yes CN701 PIN 46 = H ? Yes END No Set LCD Contrast on high level in the Menu? Flow Chart of Troubleshooting 9-9. Back Light (for Color Main LCD) Backlight does not work Yes Is LCD Contrast set on high level No Resolder CN701 or change PBA 9-15 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization
Yes CN701 PIN 46 = H ? Yes END No Set LCD Contrast on high level in the Menu? Flow Chart of Troubleshooting 9-9. Back Light (for Color Main LCD) Backlight does not work Yes Is LCD Contrast set on high level No Resolder CN701 or change PBA 9-15 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization
Service Manual
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Flow Chart of Troubleshooting 9-16 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization
Flow Chart of Troubleshooting 9-16 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization
Service Manual
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Yes U402 pin50 = 3.3V ? Key Back Light Main Key LED does not work Yes U402 pin50 = "H"? Flow Chart of Troubleshooting No Check the U402 related to "VDD_KEY" Change U402 END 9-17 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization 9-10.
Yes U402 pin50 = 3.3V ? Key Back Light Main Key LED does not work Yes U402 pin50 = "H"? Flow Chart of Troubleshooting No Check the U402 related to "VDD_KEY" Change U402 END 9-17 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization 9-10.
Service Manual
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Camera part "Camera" function does not work Yes Check the Camera connector on LCD module Yes CN701 Pin46 = H? Yes Replace the camera module END No Reconnect the camera module No Resolder CN701 or change PBA 9-18 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization Yes Is there another problem? Flow Chart of Troubleshooting 9-11.
Camera part "Camera" function does not work Yes Check the Camera connector on LCD module Yes CN701 Pin46 = H? Yes Replace the camera module END No Reconnect the camera module No Resolder CN701 or change PBA 9-18 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization Yes Is there another problem? Flow Chart of Troubleshooting 9-11.
Service Manual
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Flow Chart of Troubleshooting 9-19 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization
Flow Chart of Troubleshooting 9-19 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization