LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
5. Trouble shooting
- 102 -
5.15.3. Checking TX I/Q Signals
Check TX I/Q Signals(TP1~TP4)
Signals are
Normal ?
Replace
Transceiver
PMB6272(U401)
Yes
No
TX Part is OK.
Check Base Band Circuit
or
Re-Download S/W and Cal
Checking Points
I
Q
I
Q
TX
TP4
TP3
TP2
TP1
2
GND1
GND2
4
1 HOT1
HOT2 3
26MHz
X600
TSX- 3225
4
6
C
7
4
2
4
6
C
u
1
.
0
0
2
8
7
0
6
R
VRF_2V85
4
3
6
C
u
1
.
0
9
1
5
V
1
X
R
D
D
V
0
2
8
V
2
X
R
D
D
V
5
V
1
X
T
D
D
V
5
3
8
3
8
V
2
X
T
D
D
V
7
1
8
V
2
O
C
V
D
D
V
8
V
2
O
X
D
D
V
5
1
X
O
1
1
1
2
X
O
X
3
0
R
X
1
X
2
7
R
X
2
R
X
2
X
2
8
R
X
3
2
4
2
5
R
X
3
X
R
X
4
2
2
2
3
R
X
4
X
6
3
1
X
T
7
3
2
X
T
4
3
S
A
I
B
V
C
R
_
O
C
V
8
1
3
1
V
D
D
B
IA
S
2
V
8
8
V
D
D
D
IG
1
V
5
V
D
D
D
IG
2
V
8
5
2
1
V
D
D
L
N
A1
V
5
8
V
2
X
I
M
D
D
V
9
3
A
X
2
B
3
4
B
X
C
L
K
7
6
D
A
6
1
N
E
F
E
1
3
2
2
E
F
3
3
4
1
1
S
Y
S
F
1
0
F
SY
S
2
F
SY
S
3
9
3
1
1
D
N
G
G
N
D
2
2
6
0
4
3
D
N
G
4
D
N
G
1
4
2
9
R
X
1
PMB6272
U601
EUSY0274801
A
1
T
B
_
M
6
2
A
D
_
F
R
K
L
C
_
F
R
X
Q
Q
X
I
I
Figure 17. TX I/Q
Figure 18. TX I/Q
Figure 19. TX I/Q Waveform
Checking Points
Checking Flow
TP1(I)
TP2(IX)
TP3(Q)
TP4(QX)
