Daewoo LM32L1 Service Manual page 18

Main PCBs Trouble Diagnosis
B.When "No signal"in Y/C signal(S-Video)
1)First check if other inputs are working
=>if other inputs are not working, replace MAIN PCB
2)Checking waveforms with Color Bar Pattern(Using the oscilloscope)
- Main TP(Y signal) : RCA31
- Main TP(C signal) : RCA30
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