Samsung SGH-B300 Service Manual page 13

10. Flow Chart of Troubleshooting
10-1.Baseband
10-1-1. Power ON
'Power On' does not work
Check the current consumption
Current consumption
>= 100mA
Check the Vbat Voltage
Voltage >=3.3V
Check the pin of U300
Pin#J12 >= 2.8V
Pin#A13 and
pin#A14 =2.8V
Yes
Check the clock signal at pin#21 of U100
Freq = 26MHz
Vpp >=400mV
Vpp ≒ 600mV
Check the clock signal at pin#5,#6 of U101
Freq = 13MHz
Yes
Check the initial operation
END
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Charge the Battery
Check U300 and C313
No
pin#G11 =
1.8V
Yes
Check the clock generation circuit
(related to OSC101)
Check U101
10-1
Check U300 and C314