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Flow Chart of Troubleshooting
10-22
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C127
C123
C122
VBAT
L104
C103
L102
C100
VCCD_2.9V
C109
L103
C136
C102
C115
C104
12
RX1
RX2 13
TX_EN
4
3
0
V
B
A
T
T
VLOGIC
2
3
VRAMP
G
G
1
0
1
5
G
G
1
6
G
1
8
1
9
G
27
GSM_IN
G
G
3
2
7
G
3
3
G
G
3
4
3
5
G
G
3
6
G
8
9
2
1
G
G
2
2
2
3
G
G
2
4
2
5
G
G
2
6
G
2
8
3
1
1
7
A
N
T
5
BS1
BS2
6
DCS|PCS_IN
29
1
G
G
2
0
ANT_PAD1
PAM100
ANT_PAD2
C137
R104
C119
2
4
3
1
R103
L105
OSC101
C126
VBAT
R102
C124
7
GSM900_IN
GSM900_OUT1
5
6
GSM900_OUT2
F100
2
G
N
D
G
N
D
3
G
N
D
9
1
0
G
N
D
GSM1800_IN
8
GSM1800_OUT1
GSM1800_OUT1
VRF_2.9V
2
4
V
C
C
_
B
B
Q
1
V
C
C
_
F
E
1
7
V
C
C
_
R
E
F
1
2 VCC_TXVCO
VDD
1
3
VLDO1
1
5
VLDO2
1
6
VLDO3
9
S
C
L
K
6
5
S
D
A
T
A
7
S
E
N
TXOP_HI
1
1
TXOP_LO
1
0
V
A
F
C
1
8
1
4
VBAT
4
V
C
C
_
B
B
I
RX1800
2
8
2
7
RX1800B
RX1900
2
6
2
5
RX1900B
RX850
3
2
RX850B
3
1
RX900
3
0
RX900B
2
9
3
N
C
8
N
C
3
4
3
5
N
C
2
3
Q
2
2
Q
B
2
0
R
E
F
IN
R
E
F
IN
B
1
9
R
E
F
_
O
P
2
1
U100
3
3
GND
I
2
IB
C117 C114
C101
C125
2
A
C
1
G
3
4
G
RFS100
C111
L101
C118
C107
C128
L106
C120
C108
C121
C116
C106
C110
R101
C129
C105
BAND_SEL2
PCS1900_LNA_IN_N
PCS1900_LNA_IN_P
GSM850_LNA_IN_P
GSM850_LNA_IN_N
ANT
GSM900_LNA_IN_N
DCS1800_LNA_IN_P
DCS1800_LNA_IN_N
DPCS_PAM_IN
GSM_PAM_IN
BAND_SEL1
TX_EN
VMOD_EN
VAPC
SERLE
SERDAT
SERCLK
RTXQN
GSM900_LNA_IN_P
PCS1900_LNA_IN_N
PCS1900_LNA_IN_P
GSM850_LNA_IN_N
GSM850_LNA_IN_P
RTXIN
RTXIP
RTXQP
DCS1800_LNA_IN_N
DCS1800_LNA_IN_P
GSM900_LNA_IN_N
GSM900_LNA_IN_P
26M_OUT
DPCS_PAM_IN
GSM_PAM_IN
AFC
ANT
FM_RADIO
DCS_TX
DCS_RX
GSM_TX
GSM_RX
SPK
POWER_ON
EAR_MIC
EAR_SPK
MAIN_MIC
SIM
CHARGING
LCD
MOT
CLK
Summary of Contents for SGH-B300
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