Daewoo DLT-26C2 Service Manual page 17

C. When "No Signal" in Y/Pb/Pr signal (Component)
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 (COMP_Y): LC709, LC710 near JP904 (Top), CC592 near IC501 (Top)
-Main TP (COMP_Pb): LC711, LC712 near JP904 (Top), CC593 near IC501 (Top)
-Main TP (COMP1_Pr): LC713, LC714 near JP904 (Top), CC591 near IC501 (Top)
=> If all TP signal does not appear, replace MAIN PCB.
C signal (LC703, CC557)
Y signal (CC592)
Pb signal (CC593)