Sharp SGH-F250 manual Flow Chart of Troubleshooting, Power On

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9. Flow Chart of Troubleshooting

9-1. Power On

'Power On ' does not work

Yes

Check the current

consumption more than

100mA

Yes

Check the VBAT more than 3.3V

Yes

C319(VISA) = 2.6V?

Yes

Check the

VDD_IO_LOW_1.8V

of U305 is more than 1.8V

Yes

Check U305

VDD_IO_HIGH_2.9V = 2.9V

AVDD_2.6V = 2.6V

VDD_VIB_3.3V = 3.3V VDD_SD_2.9V = 2.9V VDD_PLL_1.2V = 1.2V

Yes

Check R120

Freq = 32KHz

Yes

Check the initial operation

Yes

END

No

Download again

No

Check the Battery

No

Check the related circuit

①

No

Check the U305 and C333, R318,

R309

②

No

Check the U305 and C300, C305,

R316, U302, C307, C311

③

No

Check the clock R120

9-1

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 Repair Precaution Safety PrecautionsESDElectrostatically Sensitive Devices Precaution GSM General Specification SpecificationTX Power GSM850 DCS1800 PCS1800 Control level GSM Tx Power ClassMain Function Product FunctionProduct Function RF CABLEGH39-00599A Software AdjustmentsArray course control Test CABLE-1.5MGH39-01022A Test CABLE-0.4MGH39-01020APre-requsite for Downloading Software DownloadingSamsung Proprietary-Contents may change without notice Cellular phone Exploded View Exploded View and Parts ListSEC Code Cellular phone Parts ListQFU01 Assy CASE-SLIDE Upper BAG PE Status Main Electrical Parts List2007-000162 R218 Chip SNA 2203-005050 C403 TA,CHIP CRYSTAL-SMD SOCKET-INTERFACE Samsung Proprietary-Contents may change without notice BaseBand Solution Block Diagram Block DiagramsRF Solution Block Diagram － Main top view PCB Diagrams－ Main bottom view Power On Flow Chart of TroubleshootingFlow 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 Spkp & Spkn High Speaker PartMelodySamsung 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 RX on GSM ReceiverDCS Receiver PCS Receiver Samsung Proprietary-Contents may change without notice Samsung Proprietary-Contents may change without notice MODULE100 GSM TransmitterDCS Transmitter PCS Transmitter Samsung Proprietary-Contents may change without notice Bluetooth part Samsung Proprietary-Contents may change without notice Reference Abbreviate Reference data10-2 Disassembly Instructions Disassembly and Assembly InstructionsFpcb Connector Samsung Proprietary-Contents may change without notice Assembly Instructions Hook Samsung Proprietary-Contents may change without notice