
- 68 -
LGE Internal Use Only
Copyright © 011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
CIRCUIT
CONTROL LOGIC
Low Band(850/900) Rx
{wYGO}svnpjP
{w[GO{luP
{wXGOizizP
6.8n
L417
L409
2.2n
3.3n
L426
C427
3.9p
FL400
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
3.9p
C428
DNI
C490
C492
DNI
C419
15n
L425
3.3n
C489
DNI
DNI
C422
C429
10u
SW400
G2
ANT
RF
G1
L423
15n
1n
C415
R410
110
1p
C426
DNI
C491
L414
1.5n
VBAT
L411
2.2nH
2.2nH
L410
L413
1.5n
C425
1.2p
1K
R407
L412
2.2nH
C410
39p
15n
L424
1n
C420
R412
110
C424
33p
R406 110
C407
1n
ANT401
GND400 GND401
C417
100p
C416
DNI
C418
100p
C421
DNI
1p
C423
U400
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
L418
6.8n
RF_TX_RAMP
RF_HB_TX
RF_LB_TX
RF_HB_RXN
RF_LB_RXN
RF_LB_RXP
RF_TX_EN
RF_BS
RF_VLOGIC
RF_HB_RXP
1
1
1
1
MODE CONTROL LOGIC
VSW_EN
0
1
0
1
MODE
STANDBY
RX2
RX1
Tx_LB
Tx_HB
TxEN
0
0
0
1
1
BS
0
0