LG PRADA KE850 - Page 103

5. Trouble shooting
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5.13.6 Checking RX I/Q Signals
Checking Flow
R432 0
C463
NA
R434 0
NA
C462
C459
NA
0R431
0R433
NA
C458
IX
I
QX
Q
Check RX I/Q Signals
Signals are
Normal ?
Replace
Transceiver
PMB6272(U404)
Yes
N
RX Part is OK.
Check Base Band Circuit
or
Re-Download S/W and Cal
Checking Points
U404
I
Q
I
Q
RX
Figure 14. RX I/Q Circuit
Figure 15. RX I/Q
Figure 16. RX I/Q Waveform