Sharp SGH-F250 manual Initial

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Flow Chart of Troubleshooting

9-2. Initial

Initial Failure

Yes

Check the VDD_IO_LOW_1.8 of U305 "High" when the phone is boot on

Yes

Check the VDD_IO_HIGH_2.9V

of U305 is "High"

LCD display is O.K?

Yes

Sound is O.K?

Yes

END

No

No

No

No

①

Check the U305 and C333, R318, R309

②

Check U305 and C300

③

Check HDC600 and LCD part

Check audio part

9-4

SAMSUNG Proprietary-Contents may change without notice

This Document can not be used without Samsung's authorization

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Contents GSM Telephone Country Web Site Safety Precautions Repair PrecautionESDElectrostatically Sensitive Devices Precaution Specification GSM General SpecificationGSM Tx Power Class TX Power GSM850 DCS1800 PCS1800 Control levelProduct Function Main FunctionProduct Function RF CABLEGH39-00599A Software AdjustmentsArray course control Test CABLE-0.4MGH39-01020A Test CABLE-1.5MGH39-01022ASoftware Downloading Pre-requsite for DownloadingSamsung Proprietary-Contents may change without notice Exploded View and Parts List Cellular phone Exploded ViewCellular phone Parts List SEC CodeQFU01 Assy CASE-SLIDE Upper BAG PE Main Electrical Parts List Status2007-000162 R218 Chip SNA 2203-005050 C403 TA,CHIP CRYSTAL-SMD SOCKET-INTERFACE Samsung Proprietary-Contents may change without notice Block Diagrams BaseBand Solution Block DiagramRF Solution Block Diagram PCB Diagrams － Main top view－ Main bottom view Flow Chart of Troubleshooting Power OnFlow Chart of Troubleshooting Samsung Proprietary-Contents may change without notice Initial Samsung Proprietary-Contents may change without notice Charging Part Samsung Proprietary-Contents may change without notice Samsung Proprietary-Contents may change without notice Sim Part Samsung Proprietary-Contents may change without notice Microphone Part Samsung Proprietary-Contents may change without notice Samsung Proprietary-Contents may change without notice Samsung Proprietary-Contents may change without notice Speaker PartMelody Spkp & Spkn HighSamsung Proprietary-Contents may change without notice Samsung Proprietary-Contents may change without notice Key Data Input Back Light for Color Main LCD Key Back Light Camera part Radio part Samsung Proprietary-Contents may change without notice GSM Receiver RX onDCS Receiver PCS Receiver Samsung Proprietary-Contents may change without notice Samsung Proprietary-Contents may change without notice GSM Transmitter MODULE100DCS Transmitter PCS Transmitter Samsung Proprietary-Contents may change without notice Bluetooth part Samsung Proprietary-Contents may change without notice Reference data Reference Abbreviate10-2 Disassembly and Assembly Instructions Disassembly InstructionsFpcb Connector Samsung Proprietary-Contents may change without notice Assembly Instructions Hook Samsung Proprietary-Contents may change without notice