Daewoo LA37L1B1LM Service Manual page 21

Hardware Trouble shooting
A. When "No signal" in PC
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(R signal) : RC239 near IC401(TOP)
-Main TP(G signal) : RC238 near IC202(TOP)
-Main TP(B signal) : RC237 near IC401(TOP)
-Main TP(H-Sync) : RC207 near JK203(TOP)
-Main TP(V-Sync) : RC206 near JK203(TOP)
=>If all TP signal does not appear, replace MAIN PCB.
1024 x 768, 60Hz R signal(RC239)
G signal(RC238)
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