Samsung SGH-G400 Service Manual page 71

Flow Chart of Troubleshooting
R102
VREG_RFRX2_2.7V
C124
C125
VREG_RFRX1_2.1V
3
ANT_JTAG
G
2 G G 4
RFIN
ANT101
1
L113
C138
R106
DCS1800_PCS1900_TX
R107
R111
1
GSM_TX IN
G
2 3
R112 R113
TX_QP
C101
TX_QM
TX_IP
C102
TX_IM
VREG_RFRX1_2.1V
C116 C117 C119
C118 C120
RTR6280_TCXO
C123
C126 C127 C128 C129 C130 C131
RX_QP
RX_QM
RX_IM
RX_IP
R103
R104
C141 C142
C147 C149
C148 C150
RFS101
C134
L101 C140
C183
VBATT
TA101
C157 C158
26
VBATT
C179
10
WCDMA1
UMTS_TX_RX
21
DCS|PCS_IN
23
GSM_IN
R108 27
BS2
GSM_ANT_SEL1
28
BS1
GSM_ANT_SEL0
29 GND
C165 C166
F104
4
OUT
G G
5
R114
GSM_PA_PWR_CTL
GSM_ANT_SEL2
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C103
DAC_REF
C113
C114
C112
C115
R101
C178
1 51
VDDA2
GCELL_INN
2 50
TCXO GCELL_INP
3 49
VDDA1 EGSM_INN
4 48
VDDA1 EGSM_INP
5 47
VTUNE1 DCS_INN
6 46
VDDA1 DCS_INP
7 45
VDDA2 GPCS_INN
U101
8 44
NC U202 GPCS_INP
9 43
NC NC
10 42
NC NC
11 41
PRX_QP NC
12 40
PRX_QN NC
13 39
PRX_IN NC
14 38
PRX_IP WPRXSE1
15 37
NC NC
16 36
NC WPRXSE2
17 35
NC
WPRXSE1_OUT
C137
R105 L104
C151
C154
C155
C152
MOD101
4 C159
RX4
5
RX3
6
RX2
7
RX1
2
MODE
3
RSVD
1
_TXEN
25
VAPC
R110
C167
C171
C174
C177
9-36
VREG_RFRX1_2.1V
C104 C105 C106 C107 C108 C109 C110 C111
UMTS2100_TX
DCS1800_PCS1900_TX
GSM_TX
VREG_RFRX2_2.7V
PWR_DET
C121
C122
GSM_RXM
GSM_RXP
DCS_RXM
DCS_RXP
PCS_RXM
PCS_RXP
C132
UMTS2100_RX
C136
F101
WCDMA_HB_MIX_IN_M
3
OUT
L102
1
IN
OUT 4
G G
C144
2 5
L103
WCDMA_HB_MIX_IN_P
VREG_RFRX1_2.1V
C153
VREG_MSMP_2.6V
C160 C161 C162
L109
F102
L105
3
OUT
1
L110
IN
4
OUT
G G
2 5
F103
C164
3
OUT
4
G G OUT
L107
2 5
C169
L111
F105
3
C181
OUT
1
IN
4
OUT
G G
L112
2 5
GSM_RXM
L106
GSM_RXP
DCS_RXM
C180
DCS_RXP
PCS_RXM
C182
PCS_RXP