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9. Flow Chart of Troubleshooting
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9-1
9-1. Power On
Check the Battery Voltage
is more than 3.7V
' Power On ' does not work
Change the Battery
END
No
Yes
C426(VISA) = 2.6V?
Check the PMU related to VINT
No
Yes
Check the Clock at
R404=32KHZ
Resolder OSC400
No
Yes
C404(+VDD_IO_LOW) &
C406(+VDD_IO_HIGH) = "H"?
Check the related circuit
No
Yes
C204(+VDD_GSM_CORE)
=1.2V?
Check the +VDD_GSM_CORE circuit
No
Yes
Check the initial operation
Yes
Yes