4. TROUBLE SHOOTING
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Copyright © 011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
(2) Checking Mobile SW &FEM
TEST POINT
CIRCUIT
CONTROL LOGIC
EGSM Rx
TP4 VLOGIC
TP6 Tx_EN
TP7 BS
TP3
TP2
TP4
TP5
TP6
TP7
TP4N VLOGIC
TP5 (V_Ramp)
TP6 (TX
EN)
TP7 (BS)
TP1
SW301
TP3
TP2
100
R304
C345
4.7p
DNI
C312
C346
4.7p
C344
4.7p
C318
33p
C302 22p
R316
DNI
R315
75
DNI
C347
L305
15n
L316
9p
3n
L301
C321
3.9p
C319
DNI
DNI
L313
VBAT
9p
L315
DNI
L314
9p
C304
4.7u
C323
4.7u
C329
9p
C301
942.5 MHz,35 MHz
FL301
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
C322
4.7p
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
RF_TX_RAMP
RF_TX_EN
RF_LB_TX
RF_HB_RXN
RF_HB_RXP
RF_LB_RXN
RF_LB_RXP
GND
RF_HB_TX
RF_VLOGIC
RF_2G_BS
(10V,1608)
TX module
TP2
TP3
TP6
TP5
TP7
TP4