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7. Flow Chart of Troubleshooting
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7-1
7-1. Power On
Yes
Yes
Check the initial operation
Yes
No
Check the clock generation circuit
(related to U100)
Check for the clock at C303
= 26MHz
Check the +VDD_GSM_CORE circuit
C400(+VDD_GSM_CORE)
= 1.8V?
No
C424(+VDD_IO_LOW) &
C423(+VDD_IO_HIGH) = "H"?
Yes
No
Resolder OSC400
Check the Clock at
R402=32KHZ
Yes
No
Change the PMU (U400)
Yes
No
END
Change the Battery
' Power On ' does not work
Check the Battery Voltage
is more than 3.4V
Yes