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