LG PRADA KE850 - Page 106

5. Trouble shooting
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5.13.10 Checking TX I/Q Signals
Checking Flow
R432 0
C463
NA
R434 0
NA
C462
C459
NA
0R431
0R433
NA
C458
IX
I
QX
Q
Check TX I/Q Signals
Signals are
Normal ?
Replace
Transceiver
PMB6272(U404)
Yes
N
TX Part is OK.
Check Base Band Circuit
or
Re-Download S/W and Cal
Checking Points
U404
I
Q
I
Q
TX
Figure 19. TX I/Q
Figure 20. TX I/Q
Figure 21. TX I/Q Waveform