Samsung SGH-S108 Service Manual page 19

5. SGH-S108 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#15 >= 2.8V
pin#46 and pin#39 =
Check the clock signal at pin#4 of
Freq = 13MHz ,
Vrms ≥ 300mV
Vpp ㆃ 900mVpp
Check the initial operation
Yes
Yes
Yes
2.8V
Yes
Yes
U801
and
Yes
END
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No
Download again
No
Charge the Battery
No
Check U100 and C113
No
pin#13 = 1.8V
No
Check the clock generation
(related to OSC801 and U801)
5-1
No
Check U100 and C112
circuit