Samsung SGH-L770V, Service Manual

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Flow Chart of Troubleshooting
10-22
FEM
C108
C120
L112
R102
R100
L103
C117 L110
C113
C116
C118
L106
VC1
14 VC2
13 VC3
VC4
12
VDD
11
1
2
GSM850_RX2
GSM850|900_TX
24
3
GSM900_RX1
GSM900_RX2
4
UMTS_TRX1 16
17 UMTS_TRX2
18
UMTS_TRX3
15
27
G G
28
5 GSM1800_RX1
6
GSM1800_RX2
22
GSM1800|1900_TX
GSM1900_RX1 7
GSM1900_RX2 8
GSM850_RX1
ANT
20
10
G G
9
G
19 21
G G
23 25
G G
26
F101
C112
R105
L105
C109
RFS100
A
2 3
C
1
G
4
G
R104
C107
L107
L111
C110
C114
L104
L108
R103
VREG_FEM_2.7V
R101
C119
2
ANT103
1
L109
C115
ANT_JTAG
PCS_RXM
PCS_RXP
DCS_RXM
DCS_RXP
GSM_ANT_SEL1_N
GSM_ANT_SEL2_N
GSM_RXP_900
GSM_RXM_900
GSM_ANT_SEL0_N
RF TRANSCEIVER
TP200
VREG_RFRX2_2.7V
C215
C231
C216
C209
C205
C228
7
6
S
AI
B
R
_
X
T
8
6
G
U
L
S_
D
N
G
9
6
VDDA2
7
C
N
0
7
C
N
1
7
NC
8
9
NC
6
2
A
D
D
V
0
6
2
A
D
D
V
1
6
2
A
D
D
V
2
6
NI
_
X
T
3
6
PI
_
X
T
4
6
N
Q
_
X
T
5
6
P
Q_
X
T
6
6
F
E
RI
_
C
A
D
PDET_IN
1
A
D
D
V
3
5
2
A
D
D
V
4
5
1
T
U
O_
F
R
_
B
L
5
5
1
T
U
O_
F
R
_
B
H
6
5
2
T
U
O_
F
R
_
B
L
7
5
2
T
U
O_
F
R
_
B
H
8
5
3
T
U
O_
F
R
_
B
H
9
5
VDDA1
GPCS_INN
DCS_INP
46
DCS_INN
47
EGSM_INP
48
EGSM_INN
49
VTUNE1
5
GCELL_INP
50
51
GCELL_INN
2
5
WPRXSE1
38
NC
39
VDDA1
4
NC
40
NC
41
NC
42
NC
43
GPCS_INP
44
45
M
B
L
X
R
P
W
13
P
B
H
X
R
P
W
23
M
B
H
X
R
P
W
33
T
U
O_
2
E
S
X
R
P
W
43
WPRXSE1_OUT
35
WPRXSE2
36
NC
37
M
D
D
V
2
E
N
U
T
V
42
2
A
D
D
V
52
N
O_
F
R
62
2
A
D
D
V
72
P
NI
_
X
M
_
B
W
82
M
NI
_
X
M
_
B
W
92
VDDA1
3
P
B
L
X
R
P
W
03
NC
17
81
C
N
91
C
N
TCXO
2
T
D
B
S
02
2
A
D
D
V
12
1
A
D
D
V
22 32
U202
VDDA2
1
10
VDDA1
PRX_QP
11
PRX_QN
12
PRX_IN
13
PRX_IP
14
NC
15
NC
16
C226
C202
C206 C204 C203
R200
C227
C225
C201
C219
C230
C211
VREG_RFRX2_2.7V
3
22
C
C210
C220
C200
4
22
C
C237
C234
C214
C222
C221
C236
L200
VREG_MSMP_2.6V
C255
ground
C233 C232
R212
C218
2
0
2
R
C217
C208
C229
OUT
OUT 4
L201
F200
G
2
G
5
1
IN
3
2
0
2
L
VREG_RFRX2_2.7V
C235
VREG_RFRX1_2.1V
VREG_RFRX1_2.1V
C213
R211
C212
C207
d
n
u
or
g
VREG_RFRX1_2.1V
0
01
2_
P
X
R_
S
T
M
U
0
01
2_
M
X
R_
S
T
M
U
UMTS_RX_2100
PWR_DET
EGSM900_TX
DCS1800_PCS1900_TX
RX_QP
RX_QM
RX_IP
RX_IM
UMTS_RXP_2100
UMTS_RXM_2100
RTR6280_TCXO
SSBDT_RTR
N
O
_
X
T
_
N
O_
F
R
UMTS2100_TX
MI
_
X
T
PI
_
X
T
M
Q_
X
T
P
Q_
X
T
GSM_RXP_900
GSM_RXM_900
PCS_RXP
PCS_RXM
DCS_RXP
DCS_RXM
F
E
R_
C
A
D
F101
U202