Chart Of Troubleshooting; Baseband; Power On - Samsung SGH-F300 Service Manual

3. Flow Chart of Troubleshooting

3-1.Baseband

3-1-1. Power ON

'Power ON' Does not work
Check the current consumption
Current consumption
Check the battery voltage
Voltage ≥ 3.3V ?
Check the pins of U838
C215 ≥ 1.8V ?
C217 and C218 = 2.8V?
Check the clock signal
at pin #3 of TCX100
Freq.=26MHz,Vrms ≥ 300mV
Check the Initial operation
≥ 100mA ?
YES
YES
YES
YES
YES
END
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NO
NO
NO
NO
C219=1.5V?
YES
NO
3-1
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Charge the Battery
Check U838 and C215
NO
Check U838 and C219
Check the clock generation circuit
TCX100