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5. Trouble shooting
5.15.3. Checking TX I/Q Signals
F
2 E
3 3
V
I B
S A
4 3
D V
T D
1 X
5 V
U601
5 3
T
1 X
PMB6272
6 3
T
2 X
EUSY0274801
7 3
D V
T D
2 X
8 V
8 3
D V
D
I M
2 X
8 V
9 3
G
N
3 D
0 4
G
N
4 D
1 4
VRF_2V85
TP4(QX)
6 C
2 4
TP1(I)
. 0
u 1
TP3(Q)
TP2(IX)
Figure 17. TX I/Q
Checking Points
TP4
LGE Internal Use Only
6 C
4 3
. 0
u 1
D V
D
R
2 X
8 V
0 2
D V
D
R
1 X
5 V
9 1
C V
O
R _
C
8 1
D V
D
C V
2 O
8 V
7 1
N E
6 1
D V
D
X
2 O
8 V
5 1
F
Y S
1 S
4 1
G
N
1 D
3 1
6 R
7 0
C
4 6
8
0 2
7 4
X600 TSX- 3225
4
HOT2 3
GND2
1 HOT1
2
GND1
26MHz
6 2
_ M
T B
F R
C _
K L
F R
D _
A
Q
X
Q
X I
I
Checking Points
TP3
TP2
TP1
Figure 18. TX I/Q
Checking Flow
Check TX I/Q Signals(TP1~TP4)
Signals are
Normal ?
Yes
TX Part is OK.
Check Base Band Circuit
or
Re-Download S/W and Cal
I
Q
I
Q
Figure 19. TX I/Q Waveform
Copyright © 2009 LG Electronics. Inc. All right reserved.
- 102 -
Replace
No
Transceiver
PMB6272(U401)
TX
Only for training and service purposes
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Table of Contents
Troubleshooting
