Samsung GT-S3550L, SGH-S3550L TSHOO
Flow Chart of Troubleshooting
9.
Power On
9-1.
Power On" does not work
"
Battery Voltage
YES
≥
3.3V?
NO
Change the Battery
Current consumption
100mA?
YES
Check PMIC output voltage
Is OK?
YES
Check the oscillator clock
OSC200(C230)
OSC201(pin3)
=26
END
kHz
=32
MHz,OK?
YES
≥
NO
Download again and check main key con.
NO
NO
,
Check the UCP200
check the OSC200, OSC201
9-1
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Charging Part
9-2.
Charging does not work
Check the Battery&TA
YES
Flow Chart of Troubleshooting
NO
?
Reinsert the Battery&TA
Is the voltage of C418
YES
Is the voltage of R300
YES
Is charging working?
YES
END
5.0V?
5.0V?
NO
NO
NO
Check the IFC400
Check the U401
Check the Chaging circuit
9-2
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Flow Chart of Troubleshooting
Q301
6
CS
VBAT
1
5
2
34
N
_
E
S
N
E
S
VSHNTCSB
VDDCHG
P
_
E
S
N
E
S
R310
Q303
CHARGING CIRCUIT
9
VBUS_5V_OUT
R304
R303
0
5
R
9
3
2
C
R300
R
3
3
1
7
0
2
R
3
Q
3
0
0
R
3
3
6
0
3
R
3
0
4
R
1
0
3
R309
Q
R306
1
3
2
R300
R309
VCHG
L109
8
0
B
A
T
2
0
0
1
L
L107
EAR_INT
USB_I2C_SDA
USB_I2C_SCL
USB_DM
USB_DP
USB_ID
EAR_SPK_R
EAR_SPK_L
EAR_MIC_P
JIG_TXD
JIG_RXD
JIG_ID
USB_DM
USB_DP
USB_ID
FM_ANT
VBUS_5V_IN
R413
R412
VDD_IO1_1.8V
R408
TP_EAR_INT
VBUS_5V_OUT
VBUS_5V_J
6
1
T
E
S
I
|
17
T
VBUS_IN
E
D
_
18
G
DM_CON
H
C
19
DP_CON
20
ID_CON
21
GND
22
NC
R
23
_
NC
O
I
D
U
A
L403
L402
1
C422
USB SWITCHING IC
C417
0
C413
L404
0
4
D
Z
VDD_IO1_1.8VVBAT_IF
R410
R409
R
R
4
4
0
0
8
U401
3
2
4
C
2
4
0
3
L
2
4
C
9
4
L
0
2
C411
C412
1
2
5
3
4
1
1
1
1
1
L
T
A
T
B
C
T
U
A
D
S
N
B
S
O
I
_
_
_
V
C
S
2
U
I
B
V
U401
L
_
O
I
D
C
I
U
M
A
3
2
C423
10
C
JIG
2
I
9
VDDIO
8
BOOT
TP_TXD
7
TXD
T
T
S
S
O
O
H
H
_
D
_
X
P
M
R
D
D
6
5
4
TP_RXD
VBUS_5V_IN
VBAT_IF
JIG_ON
JIG_ON_J
UART1_TXD
TXD1_J
RXD1_J
UART1_RXD
USB_DM_BB
USB_DP_BB
7
3
1
1
4
4
C
C
L
4
0
4
9
2
1
C
0
3
1
C
R
4
1
C411
0
TP_EAR_INT
2
1
4
C
3
2
1
1
4
4
R
R
IFC400
1
R414
R415
U400
1
6
DM
VBUS
2
5
DP
NC
4
3
NC
USB_ID
D
N
G
7
C420
C418
1
2
2
3
3
4
4
5
5
6
S1
7
S2
8
NC
9
NC
10
NC
11
NC
12
NC
13
NC
C420
1
C
4
8
U400
I
F
C
4
0
0
R
R
4
4
1
1
4
5
Z
D
4
0
0
microUSB CON
4
4
0
L
3
7
1
1
4
4
C
C
R
R
4
4
0
0
8
9
U401
9-3
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R
4
1
C411
0
TP_EAR_INT
2
1
4
C
9-3.
Sim Part
No SIM mode" is displayed on the LCD
"
Flow Chart of Troubleshooting
Check the pad condition of SIM Card
Check the SIM
connector's(SIM500)
connection to SIM card
YES
Check the voltage
C506
=2.85V,
Is there any signals
pin#2,#3,#4 of SIM5
OK?
YES
00?
YES
END
NO
NO
Resolder or Replace SIM500
Check the UCP200
NO
Check the UCP200
9-4
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Flow Chart of Troubleshooting
SIM_RST
SIM_CLK SIM_IO
R509
VSIM_2.85V
C506
C507 C508
11
22
33
7
7
88
99
SIM500
GG
16
6
5
4
12 12
10 10
13GG1415
6
R510
5
4
1111
C509
R
C
C
C
5
5
5
5
4
1
0
0
0
6
1
7
8
8
5
C
SIM500
C
5
0
9
R
5
1
0
9
0
5
R
9
3
2
C
9-5
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Audio Part-Main MIC
9-4.
Flow Chart of Troubleshooting
Phone MIC does not work
Check the connection of
MIC
400
YES
Check the voltage
C410(V_MIC)=
Check the components which
are connected to V_MIC
L400)
(
Check the circuit
of MIC PATH
C402, C403, C409)
(
2.2V,
YES
YES
OK?
NO
NO
NO
NO
Resolder or Replace MIC
Check the UCP200
Resolder L400
Resolder C402, C403, C409
400
YES
END
9-6
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Flow Chart of Troubleshooting
MIC_N
MIC_P
PARALLEL
C402
C403
V_MIC
0
0
4
L
MIC400
1
POWER
POWER
GND12GND
3
GNDGND2
4
OUT
OUT
C515
8
0
C409
C410
MAIN MIC
1
5
C
1
5
C
C409
2
C
L
4
4
0
0
0
3
0
4
C
0
1
4
C
MIC400
9-7
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Microphone Part-Earphone MIC
9-5.
Earphone MIC does not work
Flow Chart of Troubleshooting
Is the Headset O.K?
YES
Check the voltage at
C419(MIC_BIAS=
Check the components
which are connected to
V_EARMIC(R400,R401
Check the circuit
of EARMIC PATH
C404, C421
(
2.2V)?
YES
YES
)
YES
NO
NO
NO
)
NO
Change the Headset
Check the UCP200
Resolder R400,R401
Check the Ear path
Check the IFC400
YES
END
NO
Replace IFC400
9-8
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Flow Chart of Troubleshooting
V_EARMIC
JIG_TXD
JIG_RXD
JIG_ID
USB_DM
USB_DP
USB_ID
FM_ANT
EAR MIC
C417
0
0
4
D
Z
R400
R401
L404
C404
C421
C413
C419
R414
R415
AUX_MIC_PEAR_MIC_P
AUX_MIC_N
1
2
5
C
1
C419
C520
R
3
1
4
R
3
1
6
R401
R532
0
0
4
R
0
5
D
Z
PARALLEL
4
0
4
C
1
2
4
C
C407
VBUS_5V_IN
VBAT_IF
IFC400
1
1
2
2
3
3
4
4
5
5
6
U400
1
2
3
DM
DP
USB_ID
6
VBUS
5
NC
4
NC
D
N
G
7
C418
C420
S1
7
S2
8
NC
9
NC
10
NC
11
NC
12
NC
13
NC
C420
1
C
8
4
U400
I
microUSB CON
F
C
4
0
0
4
4
0
L
7
3
1
1
4
4
C
C
R
4
1
4
Z
D
4
0
0
R
4
0
8
U401
R
4
1
5
9-9
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R
R
4
4
1
0
C411
0
9
TP_EAR_INT
2
1
4
C
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