2. initial – Sharp SGH-F250 User Manual

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Flow Chart of Troubleshooting

9-4

9-2. Initial

Check the VDD_IO_LOW_1.8 of

U305 "High" when the phone is

boot on

Initial Failure

Check the

U305

and

C333, R318, R309

END

Yes

Check the VDD_IO_HIGH_2.9V

of U305 is "High"

Yes

Check

U305

and

C300

LCD display is O.K?

Check

HDC600

and LCD part

Sound is O.K?

Yes

Check audio part

①

②

③