Daewoo LA37L1B1LM Service Manual page 15

Hardware Trouble shooting
A. When "No signal" in RF, AV1, AV2
1) First check if other inputs are not working
=>If other inputs are not working, replace MAIN PCB
2) Checking waveforms with Color Bar Pattern(Using the oscilloscope)
-Main TP(RF) : CC220 near IC401(TOP)
-Main TP(AV1) : CC210 near IC202(TOP)
-Main TP(AV2) : CC212 near IC202(TOP)
=>If all TP signal does not appear, replace MAIN PCB.
CVBS signal(CC220) near IC401(TOP)
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