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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
C322(VISA) = 2.7V?
Check the Clock at
C300(VDD_IO_LOW_1.8V) &
C301(VDD_IO_HIGH_2.9V) =
C327(VDD_GSM_CORE_1.2V)
Check for the clock at C129
Check the initial operation
Yes
Yes
Yes
R308=32KHZ
Yes
"H"?
Yes
= 1.8V?
Yes
= 26MHz
Yes
Yes
END
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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_1.2V
No
Check the clock generation circuit
(related to U101)
9-1
circuit
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