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9. Flow Chart of Troubleshooting
9-1. Power On
' Power On ' does not work
Check the Battery Voltage
is more than 3.4V
C323(VISA) = 2.7V?
Check the Clock at
OSC300=32KHZ
C303(+VDD_IO_LOW) &
C304(+VDD_IO_HIGH) = "H"?
C327(+VDD_GSM_CORE)
= 1.8V?
Check for the clock at C123
= 26MHz
Check the initial operation
END
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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No
Change the Battery
No
Check the PMU related to VINT
No
Resolder OSC300
No
Check the related circuit
No
Check the +VDD_GSM_CORE circuit
No
Check the clock generation circuit
(related to U100)
9-1
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