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9. Flow Chart of Troubleshooting
9-1. Power On
' Power On ' does not work Yes
Check the Battery Voltage is more than 3.4V
No
Charge the Battery
Yes
No C406(VINT) = 2.7V? Check the PMU related to VINT
Yes
Check the Clock at R400=32KHZ
No Resolder OSC400
Yes
C420(+VDD_IO_LOW) & C419(+VDD_IO_HIGH) = "H"? Yes
No
Check the related circuit
C400(+VDD_GSM_CORE) = 1.875 V?
No
Check the +VDD_GSM_CORE circuit
Yes
Check for the clock at C117 = 26MHz
No
Check the clock generation circuit (related to TCX100)
Yes
Check the initial operation
Yes END
9-1
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