Troubleshooting.pdf
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9. Flow Chart of Troubleshooting
9-1. Power On
' Power On ' does not work
Yes
Check the Battery Voltage
No
Change the Battery
is more than 3.7V
Yes
No
C426(VISA) = 2.6V?
Check the PMU related to VINT
Yes
Check the Clock at
No
Resolder OSC400
R404=32KHZ
Yes
C404(+VDD_IO_LOW) &
C406(+VDD_IO_HIGH) = "H"?
No
Check the related circuit
Yes
C204(+VDD_GSM_CORE)
No
Check the +VDD_GSM_CORE circuit
=1.2V?
Yes
Check the initial operation
Yes
END
9-1
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This Document can not be used without Samsung's authorization
Flow Chart of Troubleshooting
9-2
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This Document can not be used without Samsung's authorization
Flow Chart of Troubleshooting
9-2. Initial
Initial Failure
Yes
U200 pin C11 (RSTON) ="H"?
No
Check the circuit related to reset
Yes
U200 pin F1(RSTEXTn)
="H"?
No
change U200
OK?
Yes
Check the 16bit data signal
&memoryCE
Yes
END
9-3
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Flow Chart of Troubleshooting
9-4
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This Document can not be used without Samsung's authorization
Flow Chart of Troubleshooting
9-3. Charging Part
Abnormal charging part
Yes
Check the U402 pin 38
No
Check the circuit related to
V_EXT_CHARGE
>5.0V
Yes
U402 pin 34(AUX_ON)
No
Check the circuit related to
AUX_ON signal
="L"?
Yes
Check the U402 pin 36
No
≒ 1.25V
Resolder or replace U402
Yes
END
9-5
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