LG KF750 Service Manual page 165

4. TROUBLE SHOOTING
4.20.6 Checking RX I,Q
To verify the RX path you have to check the pk-pk level and the shape of the RX I,Q.
WRX_Q_
R F _ C T R L _ D
R F _ C T R L _
R F _ C T R L _ S
W
LGE Internal Use Only
TP22_RF
WRX_Q_ WRX_I_N
N(R205) P(R206) (R207)
WCDMA
Transceiver
(RF3100)
Figure 4-35. RF3100, WCDMA Transceiver
3
N C 2
4
U 2 0
T X _ 1
5
N C 3
6
V C C L O T X
7
T X A I
8
R F 3 1 0 0 _ O M 6
T X B I
9
T X Q A
1 0
T X Q B
T P 2 0 4
A T A
C L K
T R B
C 2 2 9 8 2 . p
C L K
WRX_I_P
(R208)
2 8
N C 8
2 7
3
L N A 1 _ N I
2 6
N C 7
2 5
N C 6
2 4
V C C L O R X
2 3
1 9 5 H N
N C 5
2 2
V D D
2 1
T S T
R 2 0 5
2 2 0
R 2 0 6
2 2 0
R 2 0 7
2 2 0
R 2 0 8
2 2 0
Copyright © 2008 LG Electronics. Inc. All right reserved.
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C 2 2 7
D I N
W R X _ Q _ N
W R X _ Q _ P
W R X _ _ I N
W R X _ _ I P
Only for training and service purposes