Samsung SGH-E715 Service Manual page 12

2. SGH-E715 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 U100
pin #11 ≥ 2.8V ?
pin #39 and #33 = 2.8V
Check the clock signal
at pin #3 of OSC400
Freq.=13MHz,Vrms 300mV
Check the Initial operation
YES
NO
YES
NO
YES
NO
YES
YES
END
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NO
Check U100 and C110
NO
Pin #9=1.8V?
YES
Check the clock generation
NO
circuit (OSC400, U402 pin#4)
2-1
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Charge the Battery
Check U100 and C109