Flow Chart Of Troubleshooting - Samsung SGH-X105 Service Manual

4. SGH-X105 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 pin#33 =
Check the clock
signal at pin4 of
OSC400
Freq = 13MHz ,
Vrms ≥ 300mV
Vpp = 900mVpp
Check the initial operation
Yes
Yes
Yes
2.8V
Yes
Yes
and
Yes
END
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No
Download again
No
Charge the Battery
No
Check U100 and C116
No
No
pin#9 = 1.8V
No
Check the clock generation circuit
(related to OSC400, U401 pin 19)
4-1
Check U100 and C115