Samsung GT-S5620, SGH-S5620 Troubleshooting
9. Flow Chart of Troubleshooting
9-1.
Power On
'
Power On'does not work
Yes
Check the Battery Voltage
is more than
Check the Clock at
OSC
300(
32.768
C311(VCORE_1.2V
C310(VMEM_1.8V)
3.3V
Yes
C305,C307)
KHz
Yes
) = 1.24
=1.8V
Yes
No
No
=
V?
No
Change the Battery
Resolder OSC
Check the U300
300
C322(VBB_D_2.9V
C334
C319(VCXOPWR_2.8V
(1.2_
C610(V_BATT)
Check for the clock at
OSC100(U716)
Check the initial operation
VDD
END
)=2.9
)=1.2
>3.3
Yes
=26
Yes
Yes
V?
V?
)=2.8
V?
MHz
V?
No
No
Check the U300 and BTC600
Check the OSC100 and U102
9-1
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Flow Chart of Troubleshooting
9-2
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Flow Chart of Troubleshooting
9-2.
Initial
Initial Failure
Yes
pin E3(BB_RESET,TP305)
U300
Check the circuit around LCD&HDC
Short or not solder)
(
V?
0
END
Yes
Yes
=
500
No
Check the circuit connected to reset
9-3
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Flow Chart of Troubleshooting
9-4
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Flow Chart of Troubleshooting
9-3.
Charging Part
Abnormal charging part
Check the Battery&TA
L600=5V?
Yes
C605=5V?
Yes
Yes
No
No
Resolder IFC
Replace U602
600
or L600
END
Yes
9-5
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Flow Chart of Troubleshooting
9-6
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Flow Chart of Troubleshooting
9-4.
Sim Part
Insert SIM is displayed on the LCD
"
(
Yes
Check the SIM connector's
SIM
connection to SIM card
300)
Yes
Check the voltage at R309 of
VDD_SIM_3.0V
>= 3.0V ?
No
No
Resolder or change SIM
Check the U300
300
Is there any signals
pin#
C2,#C3,#
C7 of SIM
Yes
END
300 ?
No
Check the UCP200
9-7
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Flow Chart of Troubleshooting
9-8
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9-5.
Microphone Par
Microphone does not work
Is the MIC status of KEY
FPCB O.K?
Is the voltage of
2.1V ?
t
Yes
Yes
Yes
C517
No
Replace the KEY FPCB
No
Check UCP200
Is the path around MIC bias
circuit O.K?
Yes
END
No
Replace the PBA.
9-9
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Flow Chart of Troubleshooting
9-10
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9-6.
Speaker Part
Speaker does not work
Is the terminal of speaker
Is there any signals at
Is there any signals at
OK?
Yes
L406, L408
Yes
C308, C309
Yes
END
No
No
No
Check the Speaker contact
change the speaker
&
Check the circuit around U300
Check the circuit around UCP200
9-11
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Flow Chart of Troubleshooting
SPK contact>
<
9-12
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Flow Chart of Troubleshooting
9-7.
Receiver Part
Receiver does not work
Is the terminal ofreceiver OK?
Isthe
3.5
Is there any signals at
Yes
Yes
pi earjack FPCB is
OK?
pin
(
1,3)
Yes
L411,L412
?
No
No
No
Check the receiver FPCB soldering
change the receiver.
&
Change the
Change the UCP200
pi earjack FPCB
3.5
end
Yes
9-13
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Flow Chart of Troubleshooting
9-14
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