Samsung SGH-S7070, GT-S7070, GT-S7070c Troubleshooting
9. Flow C hart of Troubleshooting
9-1.
Power On
Power On'does not work
'
Check the current consumption
more than
Check the Battery voltage
Check the C332(1.8V_MEM of
U300) is more than
more than
Yes
100
Yes
Yes
Yes
3.3V
mA
1.8V
No
Download again
No
Change the Battery
No
Change the U300 and C332
Check U300
C327(3.0V_DIG)
C326(3.0V_ANLG)
C318(1.2V_ANLG)
Check C228(CLK32K)
Freq
Check the initial operation
=32
END
=3.0V
Yes
KHz
Yes
Yes
=3.0V
=1.2V
No
No
Change the U300 and C327, C326
C318
,
Change OSC300 or U300
9-1
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Flow Chart of Troubleshooting
9-2
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KHz clock>
<32
Flow Chart of Troubleshooting
9-3
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Flow Chart of Troubleshooting
9-2.
Initial
Initial Failure
Yes
Check R309(BB_RESET of U300)
or TP225
Check the16bit data signal
&
>= 2.1V
Yes
memory CE
Yes
END
No
Change R309 or U300
9-4
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Flow Chart of Troubleshooting
9-5
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Flow Chart of Troubleshooting
9-3.
Charging Part
Abnormal charging part
Check C429
Check C430
Yes
>5.0V
Yes
>5.0V
Yes
No
No
Change IFC400
Change U400
Check the TA(CHARGER),
BATTERY
Yes
END
9-6
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Flow Chart of Troubleshooting
9-7
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Flow Chart of Troubleshooting
9-4.
Sim Part
Check the SIM300's connection
Phone can't access SIM Card
Yes
to SIM card
Yes
Check C310(SIMVCC_3.0V)
or R308
=3.0V
No
resolder or change SIM300
No
resolder or change C310, R308, U300
Yes
Is there any signal pin#2,#3,#4 of
SIM300?
Yes
Check the SIM Card
Yes
END
No
resolder or change UCP200
9-8
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Flow Chart of Troubleshooting
9-9
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Flow Chart of Troubleshooting
9-5.
Microphone Part
Microphone does not work
Check MIC400's soldering
MIC_BIAS(R414)
status
Check the
Yes
Yes
=3.0V?
Yes
No
No
Resolder MIC400
Change or resolder R414, UCP200
Is there any signal
at the C431, L407 and
C432?
Yes
END
No
Change or resolder C431, L407, C432
9-10
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Flow Chart of Troubleshooting
9-11
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