Page 1
Flow Chart of Troubleshooting
9.
Baseband
9-1.
Power ON
9-1-1
Power On'does not work
'
Yes
Check the Battery
Voltage
is more than
C421 (
C401(VDD_IO_LOW_1.8V)
C414(
VINT
Check the Clock at
OSC400
VDD_IO_HIGH_2.
="
3.4V
Yes
) = 2.55
Yes
=32.7
Yes
H"?
Yes
KHZ
5
V?
V)
No
No
No
&
No
Change the Battery
Check the PMU related to VINT
Resolder OSC
Check the related circuit
400
C425(VDD_GSM_CORE_1.2V)=
1.2V ?
Yes
Check the initial operation
Yes
END
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9-1
No
Check the VDD_GSM_CORE_1.2V
circuit
Page 2
Flow Chart of Troubleshooting
9-2
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Page 3
Flow Chart of Troubleshooting
9-1-2.
Initial
Initial Failure
Yes
C345(RSTON_PMU
Yes
R336(RSTON_BB
Yes
Check the16bit data signal
memory CE
&
)="
)="
H"?
H"?
No
Check the circuit related to reset
No
change UCP300
END
Yes
9-3
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Page 4
Flow Chart of Troubleshooting
9-4
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Page 5
Flow Chart of Troubleshooting
9-1-3.
SIM Part
Phone can't access SIM Card
Check SIM_CLK Signal on
pin#3of SIM
SIM600 pin
After Power ON,
second
Yes
#4 = "
Yes
600ina
Yes
H"?
few
No
Resolder or replace U400
No
Check the Clock
After SIM card insert,
SIM600 pin
H(SIM_RST)"?
"
Check the SIM Card
#2 =
Yes
Yes
END
No
Replace PBA
9-5
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Page 6
Flow Chart of Troubleshooting
9-6
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Page 7
Flow Chart of Troubleshooting
9-1-4.
Charging Par
Abnormal charging part
Check U400 pin#A2,
B2(C420) is around
#
t
Yes
when charging
Yes
END
5V
No
Check the TA
9-7
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Page 8
Flow Chart of Troubleshooting
9-8
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Page 9
Flow Chart of Troubleshooting
9-1-5.
9-1-5-1.
Microphone Part
Main Mic Part
Microphone does not work
Check the connection
from MIC
Check the circuit
fromUCP300 to Main MIC
Yes
Yes
Yes
No
No
Resolder MIC
Resolder the L517, L518, L501, L504,
R500, R501, C505, C510, L513, L514
No
Check the MIC
Yes
END
Replace the MIC
9-9
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Page 10
Flow Chart of Troubleshooting
9-10
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Page 11
Flow Chart of Troubleshooting
9-1-5.
9-1-5-2.
Microphone Part
sub Mic Part
Microphone does not work
Check the connection
from MIC
Connect U502
from
#9to#7
Yes
No
Resloder MIC
Yes
No
Replace U502
Yes
Check the circuit
from
U502
END
to UCP300
No
Yes
Resolder the L505, L506,
C520, C523, L507, L508, R508,
R509
9-11
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Page 12
Flow Chart of Troubleshooting
7
8
1
1
3
3
C
C
2
4
C
3
R326
C
3
0
8
C
3
3
2
0
0
3
P
C
U
C
5
0
9
C
3
0
0
R331
R303
R
3
1
9
C305
R
3
0
4
8
2
0
6
0
P
T
3
R
R320
L
5
0
8
1
3
2
3
3
3
C
C
C
0
8
5
C338
C505
2
L
5
0
7
L
L
5
5
1
0
4
8
C
2
1
5
C510
C520
C339
C340
C310
7
0
3
C
C
3
2
2
C
3
2
1
5
5
1
C
C516
C
7
5
1
C518
Z
D
5
0
6
C
5
2
C341
R510
9
1
5
3
2
C
5
C
5
R
0
3
R
0
9
5
L
5
0
4
0
0
7
Z
F
D
5
0
7
7
3
3
C
4
0
5
0
8
5
R
C
R500
R
5
0
L
1
5
0
1
9-12
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Page 13
Flow Chart of Troubleshooting
9-1-6.
Speaker Part
Speaker does not work
Is Speaker working?
C307
Yes
="H"?
Yes
END
No
Resolder or replace UCP300
Yes
No
Replace Speaker
9-13
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Page 14
0
0
3
P
C
U
C339
C340
Flow Chart of Troubleshooting
8
7
1
1
3
3
C
C
4
3
2
C
R326
8
3
0
C
C
2
3
3
C310
0
7
3
C
2
3
2
C
1
3
2
C
R331
R303
5
1
C
5
C516
7
1
C
5
C518
Z
D
5
0
9
C
5
0
3
0
C
0
C305
8
2
3
3
0
R
4
1
R
9
3
R320
C
8
2
P
6
T
0
0
3
R
C338
L
5
0
1
3
3
3
C
L
5
1
4
C
8
0
5
C505
C510
2
L
5
0
7
L
5
0
8
C
1
2
5
C520
6
2
C
5
C341
R510
9
1
5
3
2
C
5
C
0
R
5
3
R
9
0
5
L
5
0
4
0
0
7
Z
F
D
5
0
7
3
7
3
C
4
0
5
0
R
5
8
L
5
0
1
C
R500
R
5
0
1
9-14
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Page 15
Flow Chart of Troubleshooting
9-1-7.
Receiver Part
Receiver does not work
C332='H'?
Is Receiver working?
Yes
No
ResolderUCP300 or change PBA
Yes
No
Replace the Receiver
Yes
END
9-15
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Page 16
Flow Chart of Troubleshooting
9-16
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Page 17
Flow Chart of Troubleshooting
9-1-8.
Headset Part
Speaker does not work
U504
from UCP300 to EAR500
Is Earphone working?
Yes
pin
#1 ='
Connect
Yes
Yes
L'?
No
No
No
Resolder
Resolder L509, L511
Change the Earphone
U504
END
Yes
9-17
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Page 18
Flow Chart of Troubleshooting
9-18
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Page 19
Flow Chart of Troubleshooting
9-1-9.
Camera Part
Camera function does not work
Check camera FPCB and connector
YES
R810(CAM_PWR_EN)="H"
YES
C807
=1.5V?
C808 = 1.8V ?
C803 = 1.8V ?
C804
=2.8V?
NO
NO
NO
Re-connect the camera FPCB
ResolderUCP300 or change PBA
Check U803, U400
Check input signals at
F800, F801, F802
YES
Replace the New Camera&END
NO
Check the F800, F801, F802
9-19
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Page 20
Flow Chart of Troubleshooting
9-20
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Page 21
Flow Chart of Troubleshooting
RF
9-2.
9-2-1.
**
GSM900 Receiver
If you check the RX chain,
Check the not only RF Device but also resistor, inductor and capacitor.
Continuous RX ON
RF Input
AMP
:-50
:62
dBm
CH
NORMAL CONDITION
Catch the channel
YES
Pin#
-55
U100
≥
-55
YES
14,15
dBm
YES
Check
≥
≥
?
-55
Check C102
MOD100 Check
Pin#A2,A3
dBm
dBm
NO
?
?
?
NO
NO
NO
Check antenna contact
Replace RFS
Replace MOD100
Check the path from
MOD100 to
100
U100
YES
THE END
9-21
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Page 22
Flow Chart of Troubleshooting
9-2-2.
**
DCS1
If you check the RX chain,
800
Receiver
Check the not only RF Device but also resistor, inductor and capacitor.
Continuous RX ON
RF Input
AMP
NORMAL CONDITION
Catch the channel
Check C102
: 650
:-50
≥
dBm
YES
-55
YES
CH
dBm
NO
?
?
NO
Check antenna contact
Replace RFS100
MOD100 Check
Pin#
16,17≥-55
U100 Check
Pin#A4,A5
THE END
NO
dBm
?
YES
≥
dBm
-55
YES
?
NO
Replace MOD100
Check the path from
MOD100 to
U100
9-22
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Page 23
Flow Chart of Troubleshooting
9-2-3.
**
PCS1900 Receiver
If you check the RX chain,
Check the not only RF Device but also resistor, inductor and capacitor.
Continuous RX ON
RF Input
AMP
NORMAL CONDITION
Catch the channel
Check C102
:661
:-50
≥
YES
-55
YES
dBm
dBm
CH
NO
?
?
NO
Check antenna contact
Replace RFS100
MOD100 Check
Pin
#18,19≥-55
U100 Check
Pin#A6,A7
THE END
≥
YES
-55
YES
dBm
dBm
NO
?
NO
?
Replace MOD100
Check the path from
MOD100 to
U100
9-23
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Flow Chart of Troubleshooting
9-24
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Flow Chart of Troubleshooting
9-25
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Page 26
Flow Chart of Troubleshooting
9-2-4.
**
GSM900 Transmitter
If you check the TX chain,
Check the not only RF Device but also resistor, inductor and capacitor.
Tx ON
Level
(
battery voltage
U100
Pin#D7
PAM100 Check
Pin
MOD100 Check
Pin
#21≥33
:5)
Check
≥
3.5
YES
#5≒3
YES
YES
:3.8V
dBm
dBm
dBm
NO
?
NO
?
NO
?
Check the
Check the path from
U100
Check the path from
PAM100 to MOD100
U100
to PAM100
RFS100 Check
1 ≥
Pin
#
32
YES
RFS100 Check
Pin#
2≥32
THE END
dBm
YES
dBm
?
NO
NO
?
Check the path from
RFS100 to MOD100
Resolder or Change RFS100
9-26
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Page 27
Flow Chart of Troubleshooting
9-2-5.
**
DCS1
If you check the TX chain,
Transmitter
800
Check the not only RF Device but also resistor, inductor and capacitor.
Tx ON
Level
(
battery voltage
U100
Pin#B7
PAM100 Check
Pin
#4≒3
MOD100 Check
Pin
#20≥30
Check
≥
3.5
YES
YES
YES
:0)
dBm
dBm
dBm
:3.8V
?
?
?
NO
NO
NO
Check the
Check the path from
U100
Check the path from
PAM100 to MOD100
U100
to PAM100
RFS100 Check
1≥
Pin
#
RFS100 Check
Pin#
2≥29
THE END
29
dBm
YES
dBm
YES
?
NO
NO
?
Check the path from
RFS100 to MOD100
Resolder or Change RFS100
9-27
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Page 28
Flow Chart of Troubleshooting
9-2-6.
**
PCS1900 Transmitter
If you check the TX chain,
Check the not only RF Device but also resistor, inductor and capacitor.
Tx ON
Level
(
battery voltage
U100
Pin#B7
PAM100 Check
Pin
#4≒3
MOD100 Check
Pin
#20
RFS100 Check
Pin
#1≥29
Check
≥
≥
:0)
3.5
YES
dBm
YES
30
YES
dBm
:3.8V
dBm
dBm
?
NO
NO
?
NO
?
NO
Check the
Check the path from
U100
Check the path from
PAM100 to MOD100
Check the path from
RFS100 to MOD100
U100
to PAM100
YES
RFS100 Check
Pin#
2≥29
THE END
dBm
YES
?
NO
Resolder or Change RFS100
9-28
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Flow Chart of Troubleshooting
9-29
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Flow Chart of Troubleshooting
9-30
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Flow Chart of Troubleshooting
9-2-7.
**
TD-SCDMA Receiver
If you check the RX chain,
Check the not only RF Device but also resistor, inductor and capacitor.
Continuous RX ON
RF Input
NORMAL CONDITION
Catch the channel
C102
MOD100 check
Pin
#10,11≥-65
Pin#G1,H1
: 10087
AMP
:-50
YES
≥
-65
YES
YES
U200 check
≥
Bm
dBm
dBm
-65
CH
?
?
dBm
NO
NO
?
?
NO
NO
Check antenna contact
Resolder RFS
Replace MOD100
Check the path from
MOD100 to
100
U200
YES
THE END
9-31
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Flow Chart of Troubleshooting
9-32
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Flow Chart of Troubleshooting
9-33
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Flow Chart of Troubleshooting
9-2-8.
**
TD-SCDMA Transmitter
If you check the TX chain,
Check the not only RF Device but also resistor, inductor and capacitor.
Tx ON
CLASS
(
U200 check
Pin#C8
U200 check
Pin#C1
C217
2)
NO
≥
≥
≥
300
YES
3
YES
dBm
1
mV
NO
dBm
NO
ResolderorReplaceU200
Resolder or Replace U200
ResolderorReplacePAM200
YES
MOD100
Pin#1
≥
22.5
YES
C109 check
≥
CHECK RFS100
dBm
23.5
YES
THE END
dBm
NO
NO
Resolder or Replace MOD101
Resolder or Replace C109
9-34
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Page 35
Flow Chart of Troubleshooting
9-35
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Flow Chart of Troubleshooting
9-36
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Flow Chart of Troubleshooting
9-2-9
FM Radio
FMRadiodoesnotwork
Yes
Check the connection
with the Earphone.
Is it good?
Yes
Check
the U201 Pin#D7
1.8V ?
Battery Voltage)
(
Yes
Check from C236
to U201 Pin#H7
Is it OK?
No
No
No
Insert the Earphone
Check the Battery and near
circuit
Check the path from EAR500
Pin
to U201 Pin#H7
#2
Yes
Check the C231,C232
Is there signal?
Yes
END
.
No
Replace the U201
or Resolder C231,C232
9-37
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Flow Chart of Troubleshooting
9-38
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Flow Chart of Troubleshooting
9-39
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Flow Chart of Troubleshooting
9-2-11
Bluetooth
Bluetooth does not work
Check the U201 Pin#A6
Is there signal,26MHz
Yes
U201 Pin#D7,C1
Is there voltage?
Yes
Yes
heck the U201 ALL
C
BT_TP
Is there signal
No
Check the U201
No
?
No
?
Check the U100
Check the path
from UCP300 to U201
Yes
Check the ANT200
Yes
END
No
Replace the ANT200
9-40
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Flow Chart of Troubleshooting
9-41
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Block Diagrams
7.
7-1
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Page 43
PCB Diagrams
8.
8-1
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Page 44
PCB Diagrams
8-2
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