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

No

Check the U305 and C333, R318,

R309

No

Check the U305 and C300, C305,

R316, U302, C307, C311

No

Check the clock R120

9-1

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