LG LHD625 Service Manual page 68

8) Focus on waveforms
PU_DET
FOD
F+
F-
PU_DET
FOD
F+
F-
32
DVD
CD
33
30
31
32
33
30 : This signal can see using special debug program
30
31
32
33
IC400
2-55
IC500
30
31