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9. Flow Chart of Troubleshooting
9-1.Baseband
9-1-1Power ON
' Power On ' does not work
Check the Battery Voltage
is more than 3.4V
C334 (VINT) = 2.55V?
Check the Clock at
R306(VDD_IO_LOW_1.8V) &
C314(VDD_IO_HIGH_2.9V) =
L303(VDD_GSM_CORE_1.2V)
Check the initial operation
Yes
Yes
Yes
OSC301=32.7KHZ
Yes
"H"?
Yes
= 1.2V
Yes
Yes
END
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No
Change the Battery
No
Check the PMU related to VINT
No
Resolder OSC301
No
Check the related circuit
No
Check the VDD_GSM_CORE_1.2V
9-1
circuit
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