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2. SGH-X120 Flow Chart of Troubleshooting
1. Power ON
'Power ON' Does not work
Check the current consumption
Current consumption
≥100mA ?
Check the V bat. voltage
Voltage ≥ 3.3V ?
Check the pin of U300
pin #11 ≥ 2.8V ?
pin #39 and #33 = 2.8V
Check the clock signal
at pin #3 of OSC100
Freq.=13MHz,Vrms 300mV
Check the Initial operation
END
YES
NO
YES
NO
YES
NO
YES
YES
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NO
Check U300 and C313
NO
Pin #9=1.8V?
YES
Check the clock generation
NO
circuit (OSC100, U105 pin#4)
2-1
Down load again
Charge the Battery
Check U300 and C312
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