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LGE Internal Use Only
Copyright © 011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
CIRCUIT
CONTROL LOGIC
Figure 4.4.5 SIM1 Mobile SW & TX Module
Figure 4.4.6 TP4 ~ TP6 Control Logic
TP
1
TP
2
TP
4
TP
3
C350
3p
10n
C353
C352
100pF
C308
15n
DNI
L300
L302
8.2n
DNI
L315
2.7n
C303
DNI
C304
ANT302
1n
L314
ANT301
DNI
L301
C323
DNI
DNI
L304
DNI
C346
C321
33p
6.8n
L303
U301
29
23
24
25
26
27
28
5
1
6
1
7
1
8
1
9
1
0
2
1
2
2
2
8
7
6
5
4
3
2
1
14
13
12
11
10
9
Tx_LB_IN
Tx_HB_IN
VSW_EN
BS
RSVD1
RSVD2
1
D
N
G
2
D
N
G
1
T
T
A
B
V
2
T
T
A
B
V
3
D
N
G
4
D
N
G
5
D
N
G
6
D
N
G
7
D
N
G
2
x
R
3
D
V
S
R
1
x
R
D
V
S
R
N
E
x
T
P
M
A
R
V
8
D
N
G
GND9
GND10
ANT
GND11
GND12
GND13
PGND
SW300
2
G
T
N
A
F
R
1
G
33p
C322
FL300
10
5
3
2
6
4
7
8
9
1 I1
O1-1
O1-2
O2-1
I2
O2-2
1
G
2
G
3
G
4
G
VBAT
L309 22
L308
47p
1.5n
L310
1.2p
C333
DNI
L305
1K
R303
1.2n
L306
39p
C320
C310
15n
DNI
C330
2.2u
C335
100n
L307
33p
C334
L313
47p
1p
C309
10u
C336
C311
100pF
C319
DNI
C307
3.3n
ANT300
C300
3.3n
DCS_PCS_OUT
GSM_OUT
RF_TX_RAMP
RF_TX_EN
0
0
8
1
G
_
0
5
8
G
RF_VLOGIC
BS2
RX12
RX34X
0
0
9
1
G
_
0
0
9
G
RX34
RX12X
TO PART_NO SKY77550
TP1
TP
TP3
TP4