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
①
No
Check the U305 and C333, R318,
R309
②
No
Check the U305 and C300, C305,
R316, U302, C307, C311
③
No
Check the clock R120
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