Samsung E740 Troubleshooting 6
9. Flow Chart of Troubleshooting
9-1. Power On
' Power On ' does not work
Yes
Check the Battery Voltage
is more than 3.5V
Yes
C403(+VDD_IO_LOW) &
C405(+VDD_IO_HIGH) = "H"
Yes
Check the Clock at
R405=32KHz
Yes
C433(+VDD_GSM_CORE)
=1.2V
No
Change the Battery
No
Change the PMIC(U403)
No
Resolder OSC400
No
Check the +VDD_GSM_CORE circuit
Yes
Check the initial operation
Yes
END
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9-1
Flow Chart of Troubleshooting
9-2
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Flow Chart of Troubleshooting
9-3
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Flow Chart of Troubleshooting
9-2. Initial
Initial Failure
Yes
Check the Battery Voltage
is more than 3.5V
Yes
Check U403 pin 14
(32KHz_DIGIT)
Yes
Is R224, R225
OK?
Yes
Check the 16bit data signal
No
Change the Battery
No
Check the circuit related to reset
No
Check the U403
Yes
END
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
Yes
Check the U403 pin 38
>4.9V
Yes
U403 pin 34
="L"
Yes
Check the U403 pin 46
≒1.4V
Yes
No
No
No
Check the circuit related to
V_EXT_CHARGE
Check the circuit related to
AUX_ON signal
Resolder or replace U403
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
Phone can't access SIM Card
Yes
T/SIM500 pin 11 or 14
(SIM_VCC) = "H"
Yes
After Power ON,
Check SIMCLK Signal on
pin15 of T/SIM500
in a few second
Yes
After SIM card insert,
T/SIM500 pin 13(SIMRST)
="H"
No
No
No
Resolder or replace U403
Check the Clock
Replace PBA
Yes
Check the SIM Card
Yes
END
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
Yes
Check the connection
of MIC
Yes
Check the circuit
from UCP200 to MIC
Yes
Check F500, PIN 5
="H"
Yes
Check the MIC
No
No
No
No
Resolder MIC
Resolder the TA602, R605, R608, R609
Check the JACK_IN signal
Replace the MIC
Yes
END
9-10
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Flow Chart of Troubleshooting
9-11
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Flow Chart of Troubleshooting
9-12
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