LG C3400 Service Manual page 55

4. Troubleshooting
(5) Checking RX IQ
TEST POINT CIRCUIT
U502
C519 C526
Figure 4-7
Waveform
Graph 4-4
Checking Flow
Check C519,C526.
No
Check if there is any
Similar? Replace U502
Major difference
Refer to graph 4-4
Yes
Redownload software and calibration againg
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