Daewoo DLT-26C2 Service Manual page 18

D. When "No Signal" in PC
1) First check if other inputs are working
=>If other inputs are not working, replace MAIN PCB
2) Second check IC705 (Sync switching IC) condition.
- 16 pin above 4.3V (IC B+)
- 9 pin is low
- 10 pin is low.
=> If other condition, replace MAIN PCB
3) Checking waveforms with Color Bar Pattern (Using the oscilloscope)
-Main TP(R signal): LC720, LC723 near JP909(Top), CC550 near IC501(Top)
-Main TP(G signal): LC721, LC724 near JP909(Top), CC549 near IC501(Top)
-Main TP(B signal): LC722, LC725 near JP909(Top), CC594 near IC501(Top)
-Main TP(H-Sync): LC736, RC797, IC705 13pin near JP909 (Top),
-Main TP(V-Sync): LC735, RC798, IC705 3pin near JP909 (Top),
Pr Signal (CC591)
CC548 near IC501(Top)