Samsung SGH-F250 Service Manual page 32

Flow Chart of Troubleshooting
9-2. Initial
Check the VDD_IO_LOW_1.8 of
U305 "High" when the phone is
Check the VDD_IO_HIGH_2.9V
of U305 is "High"
LCD display is O.K?
Initial Failure
Yes
boot on
Yes
Yes
Sound is O.K?
Yes
END
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①
No
Check the
②
No
③
No
Check
No
9-4
U305 and C333, R318, R309
Check U305 and C300
HDC600 and LCD part
Check audio part