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