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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
LGE Internal Use Only
(3) Checking PAM Control Signal
Similar?
Yes
No
Check TX_RAMP and PAM_EN
Any Major Difference or not
¨
Similar?
Yes
No
Go to Next Step
Similar?
Yes
No
Re-download S/W
Check if there is
Any Major Difference or not
¨
Refer to Graph 4.3.3
Graph 4.3.3
TEST POINT
CIRCUIT
CHECKING FLOW
WAVEFORM
Figure 4.3.3
PAM_EN
TX_RAMP
TP1
TP2
)
5
6
0
_
O
I
P
G
(
)
6
6
0
_
O
I
P
G
(
)
0
7
0
_
O
I
P
G
(
)
0
6
0
_
O
I
P
G
(
34
35
PGND5
PGND6
36
11
RX1
RX2
12
13
RX3
RX4
14
N
E
_
X
T
4
30
VBATT
C
I
G
O
L
V
2
3
P
M
A
R
V
4
1
D
N
G
GND15
25
26
GND16
28
GND17
2
D
N
G
7
8
3
D
N
G
4
D
N
G
9
10
GND5
GND6
15
16
GND7
8
D
N
G
8
1
9
1
9
D
N
G
27
GSM_IN
31
PGND1
PGND2
32
33
PGND3
PGND4
2
0
5
U
1
3
5
7
7
Y
K
S
1
0
2
5
0
0
0
H
R
M
S
T
N
A
7
1
1
S
B
5
2
S
B
6
DCS_PCS_IN
29
1
GND1
0
2
0
1
D
N
G
1
1
D
N
G
1
2
2
2
2
1
D
N
G
3
1
D
N
G
3
2
4
2
6
5
5
0
5
R
C524
27p
m
h
o
0
0
1
9
0
5
R
m
h
o
0
0
1
8
0
5
R
5
1
5
C
p
2
2
100p
C522
K
1
7
0
5
R
m
h
o
0
0
1
0
1
5
R
m
h
o
0
0
1
6
0
5
R
C523
3
9p
100p
C526
C525
100p
1
W
S
_
T
N
A
D
N
A
B
_
A
P
N
E
_
A
P
2
W
S
_
T
N
A
P
M
A
R
_
X
T
TP1
TP2