Samsung SGH-B5310, GT-B5310, GT-B5310U Troubleshooting
9. Flow Chart of Troubleshooting
9-1.
Power On
'
(
Power On'does not work
Yes
Check the Battery Voltage
is more than
pin J1(PONKY\
U400
R713)=0V? when END KEY
OSC
is pushed.
Check the Clock at
TP402)
400(
3.3V
Yes
Yes
= 32.768
Yes
)
KHz
No
No
No
Change the Battery
Check the
U400
PONKY\(ON_KEY)
Resolder OSC
related to
400
C423(VCORE_1.2V
C426(VMEM_1.8V)
C420(VBB_D_2.9V
C411(VDD_1.2V
C403(VCXOPWR_2.8V
TA400(V_BATT)
Check for the clock at
TCX200(R209)
Check the initial operation
) = 1.24
Yes
)=2.9
)=1.2
>3.3
Yes
=26
Yes
Yes
=1.8V
V?
V?
)=2.8
V?
MHz
V?
V?
No
Check the U400
No
Check the U400 and BTC400
No
Check the TCX200 and U200
END
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 D2(RESET\,R403)=0V?
U400
Yes
TP304,TP306,TP307,TP308,
[
TP310,TP311,TP312,TP313,
IS
TP314,TP315]
OK?
Yes
No
No
Check the circuit connected to reset
Check the circuit related to UME3
00
Check the circuit around LCD&HDC
Short or not solder)
(
Yes
END
600
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
C430=5V?
Yes
C428=5V?
Yes
Yes
No
No
Resolder IFC
Replace U402
400
or L402
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
Check the voltage at pin#1 of
connection to SIM card
400)
Yes
SIM
400 >= 3.0V ?
No
No
Resolder or change SIM
Check the U400
400
Yes
Is there any signals pin#2,#3,#4
of SIM
400 ?
END
No
Check the U400
9-7
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Flow Chart of Troubleshooting
9-8
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Flow Chart of Troubleshooting
9-5.
Microphone Part
Microphone does not work
Is the SMD status of
microphone O.K?
Is the voltage of
2.1V ?
Yes
Yes
Yes
C536
No
Replace the MIC.
No
Check UCP300
Is the 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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Flow Chart of Troubleshooting
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
L506, L507
Yes
C520, C521
Yes
END
No
No
No
Check the Speaker contact
change the speaker
&
Check the circuit around U503
Check the circuit around UCP300
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 LCD FPCB is OK?
Is there any signals at R310,
pin
(
R311?
1,2)
Yes
Yes
Yes
No
No
No
Check the receiver FPCB soldering
change the receiver.
&
Change the LCD FPCB
Change the UCP300
end
Yes
9-13
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Flow Chart of Troubleshooting
9-14
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Flow Chart of Troubleshooting
9-7.
Motor Part
Is the terminal of Motor OK?
Is the signal high at R605?
Is the signal is
Motor does not work
Yes
Yes
Yes
Hz wave
between Motor_P and
176
Motor_N?
No
No
No
Check the wire soldering
change the motor
&
Check the UCP300
Change the U602
Yes
Is there any signals at U602
#7, #8, #10
END
Yes
pin
?
No
Check the UCP300
9-15
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