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