Samsung i7500 Troubleshooting
Flow Chart of Troubleshooting
9.
Baseband
9-1.
9-1-1.
Power ON
Power ON' Does not work
'
Check the current consumption
Current consumption
≥
100mA?
YES
Check Voltage
The voltage of C403, C404, C405
≥
3.45V ?
Check R408 is High
> 3.45V
YES
YES
YES
NO
NO
NO
NO
Download again
Charge the Battery
Check the path Battery
Connection
Check R408
Check U400
≒
L400
≒
L401
C416, C427
≒
C433
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1.2 ?
1.2V ?
≒
2.6V ?
2.85V ?
YES
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C208
Vpp
Check the initial operation
≒
9-1
≥
NO
19.2
500
YES
MHz?
mV?
Check the U400
NO
check the OSC200
END
Flow Chart of Troubleshooting
Schematic for Power on
-
Layout for Power on
-
9-2
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Flow Chart of Troubleshooting
9-1-2.
System Initial
Initial Failure
The C351 of
Low
"
Check the Sleep X-tal signal's
Check the clock signal's
at
at
-->
YES
C442
YES
R403
U400
High"
NO
?
Check the
NO
Check the OSC
U400
400
Check the clock generation
NO
circuit(related to
U400)
YES
LCD Display OK
YES
Sound operation OK
YES
END
?
NO
Check the LCD part
NO
?
Check the Audio part
9-3
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Flow Chart of Troubleshooting
Place near the TCXO
TRK_LO_ADJ
VTCXO_2.8V
C129
R109
C130
C121
C131
TCXO
1
VC
VCC
4
2
GND
OUT
3
TCX100
TG-5010LH-31A
C122
C123
C128
TCXO_RTR6285
TCXO_PMIC
TCXO_YMU
9-4
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Flow Chart of Troubleshooting
9-1-3.
SIM Part
Please insert SIM card
"
Connection to Sub PCB.
SIM CARD is on sub pcb
at CN101 pin
Check the HEA800
YES
Check the voltage
#1
≒
YES
3.0
"
NO
Reassemble HEA800
NO
Check the CN101
There is any signal
pin#
1,#2,#8
of CN100
YES
Check the SIM Card
END
NO
Check the CN100
Check SIM's signal
**
when you see SIM checking display
9-5
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Flow Chart of Troubleshooting
Schematic for SIM connection
-
at MAIN PCB
at Sub PCB
9-6
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Layout for SIM connection
-
Flow Chart of Troubleshooting
at MAIN PCB
at SUB PCB
9-7
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Flow Chart of Troubleshooting
9-1-4.
Charging Part
Abnormal charging operation
Check IFC6
is around
Check
is"LOW"when charging
00's
when charging
5V
YES
U401's
Pin
YES
pin
#2
#1
NO
NO
Check the TA
Check the
U401
Check
U401's
Pin
#10
is"LOW" when charging
YES
END
NO
Check the
U401
9-8
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Schematic for Charging
-
Flow Chart of Troubleshooting
Layout for charging IC
-
9-9
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Flow Chart of Troubleshooting
9-1-5.
Microphone Part
Micro-phone does not work
Is the assembled status of
Microphone O.K?
YES
Check the DC bias voltage on Mic path.
YES
The voltage of R501 is
about
2.0V ?
NO
NO
Reassemble MAIN KEY FPCB
Check the path around MIC
Bias circuit
YES
ThemicrophoneisOK
YES
END
NO
Check UCP
300
9-10
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Schematic for Microphone
-
Flow Chart of Troubleshooting
9-11
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Flow Chart of Troubleshooting
9-1-6.
Speaker Part
There is no sound from speaker
The terminal of Speaker
is OK
C505,C506
=
?
YES
VBAT
YES
NO
NO
Replace the Speaker
Check the
U501
Isthere any signal
B5,D5 pin of U501?
YES
Isthere any signal
INB1,INB2pin of U501?
YES
END
NO
NO
Check the
U501
Check the U501
9-12
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Flow Chart of Troubleshooting
9-13
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Flow Chart of Troubleshooting
9-1-7.
Receiver Part
There is no sound from receiver
Is the terminal of receiver
is ok
?
YES
Are there any signal
at L509,L510
YES
NO
Replace the receiver
NO
Check the MCP300
END
9-14
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