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LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
Power Amplifier
Module
normal
abnormal
CHECKING FLOW
Fig4-20. PAM placement
Fig4-21-1. PAM schematic
Check TP1,TP2 of PAM
ramp
band
txon
TP3
TP4
TP5
PAM is OK.
Check U401
Check Control Signals
from TP3, TP4
and TP5
Check Pin
TP6,TP7 of
PAM
abnormal
Check U401
Replace PAM
abnormal
Fig4-21-2. PAM schematic
TP1
TP2
TP6
TP7
normal
normal
4.2.2.1 PAM Circuit
)
C
N
(
)
C
N
(
)
C
N
(
C427
0.01u
9
2
4
C
p
0
0
0
1
5
2
4
C
p
2
2
100
R402
8
3
4
C
p
2
1
u
1
0
.
0
6
2
4
C
1
1
4
L
H
n
6
5
4
3
4
C
I
N
D
3
M
S
G
_
N
I
P
2
S
C
X
_
N
I
P
D
N
A
B
V
1
P
M
A
R
V
1
1
0
1
N
O
X
T
V
2
0
4
U
M
S
G
_
S
C
X
_
2
1
D
N
G
P
I
N
D
0
4
4
C
VCCFEMC
J3
VCCTX1
J4
J5
VCCTX2
J6
VCCTXVCO
J9
SYSCLKEN
F3
TXBAND
G4
TXMODE
TXOUTD
J8
J7
TXOUTG
VBAT_IN
H8
G5
GNDTX2
GNDTXVCOD
H6
H7
GNDTXVCOD_B
H4
LDO_CONT
2
J
N
I
X
I
M
D
1
J
B
N
I
X
I
M
D
H3
FEMC1
FEMC2
G3
AUXCLKEN
H5
T
P3
T
P4
T
P5
T
P2
T
P
1
N
I
P
N
I
P
M
S
G
_
T
U
O
P
4
S
C
X
_
T
U
O
P
7
V
9
T
A
B
V
V
V
B
1
0
0
9
5
F
P
R
M
S
G
_
T
U
O
R
E
L
P
U
O
C
5
S
C
X
_
T
U
O
R
E
L
P
U
O
C
6
8
C
N
T
P6
T
P7