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2. SGH-S400i Flow Chart of Troubleshooting
2-
1
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2-1.Baseband
2-1-1. Power ON
'Power On' does not work
Battery Voltage
>= 3.3V
Download again
Charge the Battery
Pin#J12 >= 2.8V
Check UCD307 and C332
Pin#A13 and
pin#A14 = 2.9V
Check UCD307 and C329
Freq = 13MHz
Vrms >=300mV
Vpp >= 800mV
Check the clock generation circuit
(related to OSC101)
Check the initial operation
END
No
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
pin#C12 = 1.8V
No
Yes
Check the current consumption
Check the pin of UCD307
Check the clock signal at pin#3 of OSC101
Current consumption
>= 100mA
Check U311 and C347
pin#10 of U311 =
1.8V
No
Check U312 and C357
pin#10 of U312 =
1.6V
No
Yes
Yes
Check UCD307 and C328