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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
No
Yes
Check the VDD_IO_HIGH_2.9V
of U305 is "High"
Yes
Yes
No
Check U305 and C300
LCD display is O.K? Check HDC600 and LCD part
No
Sound is O.K?
Yes
Check audio part
No
①
②
③