LG MG120a Service Manual page 40

4. TROUBLE SHOOTING
(4) Checking RX IQ
TEST POINT
U103
Figure 5
WAVEFORM
CHECKING FLOW
Check C134,C140.
Check if there is any
Major difference
Refer to graph 4-3
C134
C140
Similar?
Yes
Redownload software and calibration again
-40-
CIRCUIT
Graph 3
No No
Replace U103