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7. SGH-E350 Flow Chart of Troubleshooting
1. Power On
' Power On ' does not work
Check the Battery Voltage
is more than 3.4V
C408(VINT) = 2.7V?
Check the Clock at
U704=32KHZ
C424(+VDD_IO_LOW) &
C423(+VDD_IO_HIGH) = "H"?
C402(+VDD_GSM_CORE)
= 1.8V?
Check for the clock at C300
= 26MHz
Check the initial operation
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
END
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No
Change the Battery
No
Check the PMU related to VINT
No
Resolder OSC400
No
Check the related circuit
No
Check the +VDD_GSM_CORE circuit
No
Check the clock generation circuit
(related to U100)
7-1
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