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3. SGH-P400 Flow Chart of Troubleshooting
3-
1
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1. Power On
Current consumption
>=100mA
' Power On ' does not work
Voltage >= 3.3V
Download again
Charge the Battery
pin#11 >= 2.8V
Check U100 and C117
pin#39 and pin#42 =
2.8V
Check U100 and C116
Freq = 13MHz ,
Vrms ≥ 300mV
and
Vpp
=
900mVpp
Check the clock generation
circuit
(related to OSC801)
END
No
Yes
Yes
Yes
Yes
Yes
No
No
No
No
pin#9 = 1.8V
No
Yes
Check the V bat. Voltage
Check the pin of U100
Check the clock signal at pin#3 of
OSC801
Check the initial operation
Check the current
consumption