Daewoo DLT-26C2 Service Manual page 16

A. When "No signal" in CVBS (RF, AV1,AV2,AV3)
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 (RF): CC561 near IC501 (Top)
-Main TP(AV1): LC730 near JP906 (Top), CC560 near IC501 (Top)
-Main TP(AV2): LC733 near JP907 (Top), CC559 near IC501 (Top)
-Main TP(AV3): LC701 near JP902 (Top), CC558 near IC501 (Top)
=> If all TP signal does not appear, replace MAIN PCB.
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): LC702 near JP901 (Top), CC555 near IC501 (Top)
-Main TP(C signal): LC703 near JP901 (Top), CC557 near IC501 (Top)
=> If all TP signal does not appear, replace MAIN PCB.
CVBS signal (CC561,CC560, CC559, CC558)
Y signal (LC702, CC555)