LG -S310 Service Manual page 127

4. TROUBLE SHOOTING
4.15.6 Check the IQ signal
Check the IQ signal from MT6235(U200)
TP1
TP1
R102 2.2K
RF_IP
C103
82p
R104 2.2K
RF_IN
Checking Points and Flow
TP2
IQ Signal Waveform
Call connection
LGE Internal Use Only
1
U100
I
2
IB
3
VSUP_BBI
4
REF_SEL
5 AD6546
SEL_26M
6
VLDO3_DRV
C108 56p 7
TP1
- 128 -
C102 100p
TP2
TP2
C104
30
82p
Q
29
QB
28
SCLK
27
SDATA
26
SEN
25
VDD
24
No network
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Only for training and service purposes
C101
0.1u
R103 2.2K
RF_QP
R105 2.2K
RF_QN
RF_S_CLK
RF_S_DATA
RF_S_EN